Zenith Z-100 PC series Page 62 Service Manual Download

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Summary of Contents for Z-100 PC series

Page 1: ...SERVICE MODULE Power Supply Z 100 PC Series Computers 585 60 01 860 45 aNI N data systems...

Page 2: ...tins SERVICE DATE CHANGED PURPOSE OF SERVICE INITIALS BULLETIN OF PAGE S BULLETIN NUMBER ISSUE LIMITED RIGHTS LEGEND Contractor is Zenith Data Systems Corporation of St Joseph Michigan 49085 The entir...

Page 3: ...ons Introduction 1 1 Specifications 1 1 Chapter 2 Configuration Chapter 3 Theory of Operation Introduction 3 1 Outputs 3 1 Power Supply Good PSG Signal 3 3 Operation at No Load 3 3 Chapter 4 Troublesh...

Page 4: ...Federal Communications Commission KHz Kilohertz ms millisecond mV millivolt PSG Power Supply Good TTL Transistor Transistor Logic UL Underwriters Laboratories VAC Voltage Alternating Current VDC Volt...

Page 5: ...ly as a unit is NOT SERVICEABLE The power supply contains roprietary information Therefore there is no disassembly parts list reassembly or schematic included with this module The specifications for t...

Page 6: ...e switch is normally set for 115 VAC If this computer is to be operated on 240 VAC line voltage use a small bladed screwdriver and break the plastic window over the 115 VAC position of the switch Then...

Page 7: ...d power supply are electrically iso lated from the main voltage and share a common ground which is the chassis of the power supply The voltages output to disk drive connectors P1 and P2 have special r...

Page 8: ...OAD RESISTORS Figure 3 1 Power Supply Output 5V 1 5A 12V 1 5A 12V 2 5A 5V 1 8A 12 REG FULL LOAD 1 P3 8 I 5 5V BALANCE 5 FULL LOAD GROUND 15 I I P1 I I I 151lH 151lH 12 12V BALANCE 12 OF FULL LOAD GROU...

Page 9: ...s normal limit plus 1 of nominal voltage refer to Specifications PSG will go high PSG will not return to a low condition until outputs have met the same conditions as those required at initial power a...

Page 10: ...ll indicate if the circuit cards or disk drives are loading down the power supply WARNING The load resistors listed below generate heat Use caution to avoid burns NOTE Voltages may not be within toler...

Page 11: ...SERVICE MODULE Backplane Board Z 100 PC Series Computers 585 64 02 860 45 aNI data systems...

Page 12: ...tins SERVICE DATE CHANGED PURPOSE OF SERVICE BULLETIN OF PAGE S BULLETIN NUMBER ISSUE INITIALS LIMITED RIGHTS LEGEND Contractor is Zenith Data Systems Corporation of St Joseph Michigan 49085 The entir...

Page 13: ...lator 2 2 Diagnostic LEDs 2 2 Backplane I O Connectors 2 2 Chapter 3 Detailed Circuit Description Power Distribution 3 1 5 VDC Regulation 3 1 Diagnostic Circuitry 3 2 Signal Bus 3 2 Chapter 4 Troubles...

Page 14: ...Page iv Contents Figures 2 1 Backplane Board Block Diagram 2 1 5 1 Backplane Board Component Layout 5 3 Tables 3 1 I O Bus Signal Names 3 3...

Page 15: ...sing Unit DC Direct Current DMA Direct Memory Access GND Ground liD Input Output lED Light Emitting Diode mA Milliamperes MHz Megahertz NMI Non Masked Interrupt ns nanosecond PSG Power Supply Good ROM...

Page 16: ...The LEDs on the backplane board aid the user in determining whether or not a fault lies in the DC power generation circuits The five LEDs on this board indicate the overall integrity of the power sup...

Page 17: ...ory is 640K of 64K devices or 76aK using 256K devices Six levels of interrupt Control lines for memory and I O read and write Clock and timing control lines A channel check line for device error repor...

Page 18: ...ctor P110 from the power supply delivers the operating supply voltages for the cards which plug into the backplane board connectors and for the diagnostic LED array contained on the backplane board Sy...

Page 19: ...inline with the LEDs to provide the appropriate operating volt age and current to the devices The LEDs are on lit when the parameter associated with a device is at or near its stated value and off wh...

Page 20: ...pectively on the parallel signal bus connectors P101 through P108 and also are applied to their respective LEOs 12 VDC also is fed to the input pin I of U1 01 the 5 VDC regulator Ground GND is routed...

Page 21: ...ply outputs Up until this point pin 10 of P11 0 which is arso the cathode of 0104 is at approxi mately 5 VDC keeping the LED extinguished If at the end of the delay time all the supply voltages are no...

Page 22: ...Data bit3 A7 02 Oatabit2 A8 01 Data bit 1 A9 00 OatabitO A10 I OCHRDY 110 channel ready Used by slower peripherals to ensure data is not lost during read and write operations May be held low not read...

Page 23: ...it 7 A25 A6 Address bit 6 A26 A5 Address bit 5 A27 A4 Address bit 4 III A28 A3 Address bit 3 A29 A2 Address bit 2 A30 A1 Address bit 1 A31 AO Address bit 0 81 GND Ground 82 RESET When high resets or i...

Page 24: ...rive data onto the data bus liD write When low instructs an I O device to read the data on the data bus I O read When low instructs an I O device to drive its data onto the data bus DMA acknowledge 3...

Page 25: ...t request 3 Assigned to serial port 2 configurable B26 DACK2 DMA acknowledge 2 Assigned to floppy disk controller B27 TIC Terminal count Goes high when terminal count for any DMA channel is reached B2...

Page 26: ...ep checks which follow Fault isolation is divided into two categories power supply related problems and signal bus problems DC Voltages and Diagnostics If one or more of the backplane LEOs is extingui...

Page 27: ...should read 560 ohms 2 If the resistor checks good replace the LED in question If the previous checks do not indicate a problem perform the following checks 1 Set the voltmeter to read negative polar...

Page 28: ...t with the CPU card 2 Turn the computer back on and perform several operations to deter mine if the problem still is present or has changed in nature If the same problem still is present it is probabl...

Page 29: ...C106 Not Used P103 HE 432 1351 Connector edge 62 pin C107 HE 25 928 33 F electrolytic P104 HE 432 1351 Connector edge 62 pin C108 Not Used P105 HE 432 1351 Connector edge 62 pin C109 Not Used C110 HE...

Page 30: ...erencing where applicable the Zenith Heath part numbers with generic device numbers The components are listed in numerical order along with any applicable device number and device lead configuration H...

Page 31: ...B6 A6 B7 A7 12 Rt03 Kf B8 A8 12 OlD B9 A9 PSG A Bl Al0 A lO B A l0 B A l0 8 A l0 8 10 Bf I A 12 t05 Blt AU 5 0 B12 A12 Pl09 L B13 At3 B14 A14 B15 A15 13 B16 At6 10 Bt7 A17 Bt8 A18 7 B19 A19 4 B A 820...

Page 32: ...RbY BUS MEMW 6 lEN II lLVDC 0 B7 MEMI 812 All Alq BuS lOW 613 I AlB IOff 614 r AI1 tl2 vo Xl 0 DIlC 1 3 Gj AI 6 t Bus RI04 I l DRQ3 6Uo Iv 1 J5 sr o l IKKI 611 IU 0 14 A Riol 11102 RI 3 DRQI S 8 P B A...

Page 33: ...N OHMS k 1 QC I j OUorder tromZenilhDa ro Ihe HE 1 000 0001 AU RESISTORS ARE 114 WATT S JIo UNLESS OTHeR WISE SPeCFlED 2 AU CAPACITOR VALUES ARE IN MICROFARADS UNLESS OTHERWISE SPECIFIED from HNIh Com...

Page 34: ...SERVICE MODULE Keyboard Z 150 PC Desktop Computers Z 160 PC Portable Computers 585 61 05 860 45 2N1 N data systems...

Page 35: ...tins SERVICE DATE CHANGED PURPOSE OF SERVICE BULLETIN OF PAGE S BULLETIN NUMBER ISSUE INITIALS LIMITED RIGHTS LEGEND Contractor is Zenith Data Systems Corporation 01 St Joseph Michigan 49085 The entir...

Page 36: ...ations 3 5 Chapter 4 Theory of Ope ation Introduction 4 1 Theory of Operation 4 1 Chapter 5 Detailed Circuit Description Introduction 5 1 Circuit Description 5 1 Chapter 6 Disassembly Disassembly Proc...

Page 37: ...2 1 4 1 Keyboard Block Diagram 4 1 6 1 Keyboard Disassembly 6 2 8 1 Keyboard Reassembly 8 2 9 1 Z 150 Desktop Computer Keyboard Exploded View 9 3 9 2 Z 160 Portable Computer Keyboard Exploded View 9 5...

Page 38: ...terchange CPU Central Processing Unit CRC Cyclic Redundancy Check Hex Hexadecimal 1 0 Input Output LED Light Emitting Diode LSB Least Significant Bit mA Milliampere MSB Most Significant Bit RAM Random...

Page 39: ...sk top Computer and the Z 160 PC Portable Computer This chapter includes the description and specifications of the keyboard Description Refer to Figure 1 1 The keyboard is packaged in a low profile en...

Page 40: ...er defined by soft ware On the right side is a 16 key keypad area This area also is defined by software but contains legends for the functions of numeric entry cursor control and calculator pad screen...

Page 41: ...nd break codes For example key 1 produces hexadecimal 01 when pressed and hexadecimal 81 when released The keyboard input output liD driver can produce code either with or without control keys SHIFT C...

Page 42: ...1 0 card mayor may not have two serial connec tors as shown in Figure 2 1 2 The three card computer design combines the floppy disk serial 1 0 card with the video card and will have one serial connec...

Page 43: ...le The cable inter face contains power 5 VDC ground two bidirectional signal lines and a keyboard reset line disabled The cable is either permanently attached at the keyboard end and plugs into the CP...

Page 44: ...lue of zero 0 to indicate a special key and the second being the code of the key itself Thus function key F10 which generates 7100H in hardware will generate OOH followed by 71 H The table is arranged...

Page 45: ...LOCK OA39H OB30H OC2DH OD3DH OE08H 2960H OF09H 1051H 1157H 1245H 1352H 1454H 1559H 1655H 1749H 184FH 1950H 1A5BH 1B5DH 4737H 4838H 4939H 4A2DH 1E41H 1F53H 2044H SHIFTED OA28H OB29H OC5FH OD2BH OE08H 2...

Page 46: ...Page 3 3 Operation...

Page 47: ...g CTRL NUM LCK will temporarily halt the execution of a program 3 Pressing CTRL BREAK will halt the execution of a program and exit back to the system This key sequence sends a special code of OOOOH 4...

Page 48: ...are used for special purposes by the com puter firmware MFM 150 monitor ROM CTRL ALT DEL Resets the computer GTRL ALT INS Returns control to the MFM 150 monitor GTRL ALT RETURN Enters the MFM 150 moni...

Page 49: ...The keyboard uses a microcomputer Intel 8048 per forming the keyboard scan functions Additional keyboard functions are key debounce buffering of up to 256 key scan codes maintaining bidirec tional ser...

Page 50: ...ted between XTAL and XTAL 2 for the internal control and timing references of U107 Capacitors C1 and C2 are used for stability purposes Port bits P10 LSB through P13 MSB of U107 control the scan lines...

Page 51: ...lter of C6 through C14 provides the required filtering of the VDC input 5 Power of approximately 5 VDC is applied to the keyboard through pin 1 Table 5 1 8048 8748 Pin Definitions DESIGNATION PIN DESC...

Page 52: ...a clock output using ENTO ClK instruction T1 39 Input pin testable using the JT1 and JNT1 instructions Can be designated the timer counter input using the STRT CNT instruction INT 6 Interrupt input In...

Page 53: ...p input can be used in conjunction with ALE to single step the processor through each instruction Active low EA 7 External access input which forces all program memory fetches to reference external me...

Page 54: ...The Z 160 disassembly sequence is similar for an accurate representation refer to Figure 9 2 Place the keyboard face down on a soft cloth Remove four 6 x 3 8 screws and bottom panel Remove six 6 x 1...

Page 55: ...Page 6 2 Disassembly Figure 6 1 Keyboard Disassembly...

Page 56: ...ed by the CPU including a power on self test This diagnostic CRC Cyclic Redundancy Check uses an algorithm to check the microcomputer ROM tests memory and checks for stuck keys If a problem exists wit...

Page 57: ...nce is similar for an accurate represen tation refer to figure 9 2 Place the keyboard cabinet face down on a soft cloth Install rubber strain relief keyboard cable connector in the Z 160 into slot Ins...

Page 58: ...Page 8 2 Reassembly Figure 8 1 Keyboard Reassembly...

Page 59: ...for Z 150 part identifica tion The Z 150 Desktop Computer keyboard wired and tested part number is HE 181 5599 or 181 5745 The Z 160 Portable Computer keyboard wired and tested part number is HE 181 4...

Page 60: ...1521 45 HE 444 238 1 or HE 444 314 or HE 187 5305 50 HE 253 60 55 HE 260 713 60 HE 92 803 65 HE 485 54 DESCRIPTION Bottom plate Screw pan head phillips 6 BT x 375 Support leg Spring leg return Insulat...

Page 61: ...Page 9 3 Parts List BOTTOM PANEL 10 Figure 9 1 Z 150 Desktop Computer Keyboard Exploded View...

Page 62: ...5 HE 92 322 50 HE 94 644 55 HE 94 645 60 HE 252 178 65 HE 134 1397 DESCRIPTION Keyboard bottom Screw pan head phillips 6 BT x 375 Support leg Shaft Keyboard assembly Screw pan head slotted 6 32 x 187...

Page 63: ...COILED KEYBOARD CABLE 65 KEYBOARD BOTTOM KEYBOARD TOP 45 Page 9 5 Parts List 6 BTx3 S BLACK 15 SELF TAPPING SCREW Figure 9 2 Z 160 Portable Computer Keyboard Exploded View...

Page 64: ...Miscellaneous Diode HE 485 54 HE 473 29 D101 HE 56 56 IN4149 Crystal Y101 HE 404 647 6 000 MHz use only with or keyboard microcomputer HE 444 238 HE 404 689 3 58 MHz use only with keyboard microcomput...

Page 65: ...HE 21 786 1 jJ F HE 443 1037 C5 HE 21 786 1 jJ F HE 434 299 Socket C6 HE 21 786 1 jJ F U2 HE 443 802 Quad multiplexer C7 HE 21 707 36pF 2 input tri state C8 HE 21 707 36pF or C9 HE 25 866 22pF HE 443...

Page 66: ...d configuration The Zenith Heath part numbers are cross referenced where applicable with generic alternate device numbers Part Number Index HEATH PART DEVICE NUMBER NUMBER DESCRIPTION LEAD CONFIGURATI...

Page 67: ...HE 443 837 74LS373 HE 443 872 74LS14 HE 443 967 7406 DESCRIPTION LEAD CONFIGURATION US 8 bit tri state latch CONTROL OUTPUT 4D 40 GNO 5D G U4 Hex inverter U101 Hex inverter buffer driver ENA8LE HE 44...

Page 68: ...Tl PI I P l ADO a os w XTAL2 3 38 P21 PLC Pf1 lIADI 0 Z iiESU 4 3I PZ6 P1 3 1 21AD2 C5 PI 4 PC 31AD3 _vo C INT PI PC 4 A 04 EA Li PD 5 AD5 RD PI 7 P0 61 AD6 PSEN PI5 RST PC IIAOI WR RXO P3 Q EA 0 ALE...

Page 69: ...Page 9 11 Parts List HEATH PART DEVICE NUMBER NUMBER DESCRIPTION LEAD CONFIGURATION HE 444 320 U6 ROM...

Page 70: ...P2 6ll NC PIll O L 3 P1 2 Pl _ PI2 IV 30 zo PI3 4 Pl 3 LEDIN 69 5 PIA 3 D 4 I b PLS 1 LED IN C58 I Z2 PI Eo 1 c 8 Pl U3 13 us I 16 14 P3 6 LS37 17 l2 P3 7 OBO 10 P3 0 D 11 ALE f i 3 O ___ _ _ _ _ _ _...

Page 71: ...HE 1t lOU cwctIr from ZerWItI t ooo OOO AU RESISTORSAFIE 4 WATT 5 11 UNlESSOTHEA prtIIb WISE SPeCIFIED 2 AU CAPACITOR VAlUES ARE IN F MtCROFARADS UNLESS OTHEAWISE SPECIFIED you order I 1Imm ecwnp y D...

Page 72: ...9 30 VSS 8048 PI3 DB4 P14 3 10 2 4 71 07 NC 32 4 7 Db PIS NC D 9 17 33 D5 P16 NC 4 1K 1 3 NC UIOI 04 P25 15 24 DB 03 P23 DBl 02 14 35 P24 13 23 4 1K 01 P22 DBO 12 DO 21 eLK OUT P20 34 P 7 U104 38 PZ7...

Page 73: ...It 1 000 II W oro pM fIom z 0 ay m ute thII HE 1 ooo OCIO ALL FlE8ISTORS ARE 114 WATT Ufrl ESSOTHER MSE SPECFIED 2 AU CAPACITOR VAlUES ARE IN F MICROFARADS IN ESS OTHERWISE SPECIFIED W orWr p t from H...

Page 74: ...SERVICE M ODULE CPU Memory Card with Gate Array Z 158 Computers Part Number HE 181 5445 128K HE 181 5857 256K HE lSl 5601 320K 585 105 01 860 94 1...

Page 75: ...8088 2 Microprocessor The Instruction Cycle Interrupt Operation System Timing Programmable Interval Timer Interrupt Controller Gate Array Peripheral Interface Keyboard Communication Chapter 5 System T...

Page 76: ...ory Card Component Layout 6 1 6 2 CPU Schematic 6 12 6 3 Parallel Port Schematic 6 13 6 4 Memory Schematic 6 14 6 5 Gate Array Control Schematic 6 15 6 6 Gate Array DMA Schematic 6 16 Tables 2 1 CPU C...

Page 77: ...he keyboard connector external to the computer The frequencies are derived by dividing the two crystal oscillator frequen cies 14 31818 MHz and 24 0 MHz by 3 Also the CPU memory card was designed so t...

Page 78: ...lectrostatic sensitive and can be damaged by static electricity if they are handled improperly When you remove an IC or card from its mounting or from its protective packing do not lay it down or let...

Page 79: ...y is set at 5 MHz Table 2 1 CPU Clock Frequency Selection SWITCH POSITION CPU CLOCK FREQUENCY IN 4 77 MHz OUT 8 00 MHz DIP switch SW202 configures the CPU memory card to the specific hardware of the s...

Page 80: ...Floppy disk controller installed factory setting Used to determine whether color or monochrome video circuitry is installed The video floppy card installed in the Z 158 computer requires that this swi...

Page 81: ...3 Used to configure the CPU memory card s memory banks in terms of how many 256 kilobit devices are installed Settings are as follows ON ON No banks contain 256 kilobit RAM devices ON OFF Bank 0 conta...

Page 82: ...s DEFINTION Used to determine the base parallel port address Settings are as follows Pins 1 and 2 jumpered 378H Pins 2 and 3 jumpered 278H Used to enable the parallel port Settings are as follows ON P...

Page 83: ...ram while reading the descriptions in the following paragraphs l BACKPLANE BOARD CONNECTOR e e e l l l TO OTHER III III III DEVICES ct e J l e 0 ct w a e a l e z e 0 ct 8088 2 8087 2 BUFFER GATE PROGR...

Page 84: ...m It receives inputs from the peripherals and keyboard calculates all solutions and controls the computer system This microprocessor is manufactured using HMOS techonology and has 16 bit internal arch...

Page 85: ...U memory card inform the microprocesor of the system configuration This allows the micro processor to utilize the installed hardware correctly and efficiently For more information on configuring the C...

Page 86: ...tes directly with the gate array This relieves the microprocessor of the responsibility of frequently checking for keyboard entries When a key is pressed the gate array sends a system interrupt to the...

Page 87: ...in the CPU memory card is manufac tured using HMOS technology This device is functionally identical to other 8088 type microprocessors however it is capable of operating at much higher clock frequenc...

Page 88: ...round for the 8088 2 microprocessor U235 2 8 39 A8 A15 Middle order address lines 9 16 ADO AD7 These signals are used for both the data bus and the first eight bits of the address bus At the beginning...

Page 89: ...quence This signal is an acknowledgment from the addressed memory or I O device that it will complete the requested data transfer The READY signal is normally used with low speed devices which cannot...

Page 90: ...nstruction cycle is to load the contents of the internal program counter register into the address outputs ADO through AD7 The program counter also keeps track of the address of the next instruction s...

Page 91: ...f interrupts used with the 8088 2 The non maskable interrupt NMI cannot be ignored by the device while some instructions can tell the microprocessor to ignore maskable interrupts lNTR In either case t...

Page 92: ...4 2 through 4 5 illustrate the timing for memory read memory write I O read and I O write operations respectively These diagrams represent state changes in the signals listed in Table 4 3 Table 4 3 Ti...

Page 93: ...J I IL _______________ J DT R ________________________________________________ 210ns j 5MHz T1 1 40ns 1 40nS SO S2 L_______________________ J 1 MR ___________ 1 5rO n_s I _ 40ns DO D7 1 10ns 1 I 80ns...

Page 94: ...I r I 5i 0 nS ___________ I _ 3 0 ns MAO MA8 1 IL ________________________________ r____ h 20ns oT R J 5MHz so S2 I 40ns h 40ns l ____________ ___________ I I 1 20ns MW ______________ 20ns 4 I 1 110n...

Page 95: ...50ns GCPU LI __ GM 1 6ons I OT R 5MHz I 80 82 4 I40170nS 1 f 0 n s I i 2 0 n S ______________ J AlEB 1 40nS AO A8 I I IOR _______ 8 0 ns __ I _____ I 1 20ns 00 07 I l a 90ns I GCPU I _1 O O ns __ L __...

Page 96: ...s L __________________________________ 10ns IOW I I 00 D 7 5 0 n s 20 n s GCPU I L 60 30ns GM n s r I 20ns 20ns J L DT R 5MHz 40170ns 50 ns SO S2 rJL I 1 60ns 20ns J ALES AO A8 10ns 10 W I L 1 1 o n s...

Page 97: ...tified in Table 4 4 Table 4 5 identifies the programming codes for this device Table 4 4 Programmable Interval Timer Operating Modes MODE NUMBER DESCRIPTION o A terminal value is loaded into the selec...

Page 98: ...mer Programming Codes INPUT SIGNALS CS RD WR AO AI FUNCTION 0 1 0 0 0 Load counter 0 0 1 0 0 1 Load counter 1 0 1 0 I 0 Load counter 2 0 1 0 1 1 Write mode word 0 0 1 0 0 Read counter 0 0 0 1 0 I Read...

Page 99: ...rates a maskable interrupt signal INT for the interrupt of highest priority The microprocessor can tell the interrupt controller to ignore or mask all interrupts or to change the priority of the inter...

Page 100: ...DREQI Figure 4 8 Gate Array Pinouts As signal generator the gate array provides either a 4 77 MHz or 8 0 MHz 33 duty cycle clock signal CLKG to the 8088 2 as determined by the position of switch SW201...

Page 101: ...the busses are not needed When a data transfer is to be performed a DREQ signal is sent to the gate array The gate array then assumes control of the busses from the microprocessor long enough for the...

Page 102: ...ing transmit or receive status to data transceiver U245 Address inputs Data outputs refer also to pins 56 60 Request for DMA channels 2 and 3 refer also to pin 24 I O CH ready signal from bus Request...

Page 103: ...6 that drives the CPU memory card LEDs 5VDC ROW signal to SB input pin 1 of quad multiplexers U228 and U230 and to pin 11 of address decoder U231 Ground Not connected Clock signal to 8088 2 8087 2 and...

Page 104: ...4 31818 MHz oscillator Y202 Enables the outputs of drivers so that the settings of DIP switches SW202 can be read Connection with pin 51 to 24 000 MHz oscillator Y20 1 Connection with pin 46 to 14 318...

Page 105: ...cycles this signal disables the address drivers of the CPu 65 DEN Data enable signal to DEN input pin 13 of gate array control U238 66 IRQl Interrupt request signal to IR 1 pin 19 input of interrupt...

Page 106: ...AUTOFDXT 15 ERROR 16 INIT 17 SLCTIN 18 25 GND DESCRIPTION Strobe signal to peripheral Data to peripheral device Acknowledge from peripheral Busy signal from peripheral End of paper signal from printe...

Page 107: ...able 4 8 identifies the keyboard signals Refer to Figure 4 10 for the connector pinouts Figure 4 10 Keyboard Connector Pinouts Table 4 8 Keyboard Signals CONNECTOR PIN NUMBER SIGNAL NAME DESCRIPTION 1...

Page 108: ...e computer is turned on and several other tests which can be selected from a menu The use of these tests is explained in the service guide for Z lSO PC Series computers The disk based diagnostics are...

Page 109: ...e 860 136 Refer to these documents or to the disk based diagnostics documentation CB S063 28 for more information Whenever troubleshooting the system first check the power supply LEDs on the backplane...

Page 110: ...90 230 The CPU memory card LEDs are shown in Figure 5 2 Five of the six LEDs on the CPU memory card correspond to specific sections of the system circuitry CPU ROM RAM interrupt and disk controller Th...

Page 111: ...he interrupt control and or timer logic in the CPU circuitry Refer to Chapter 2 and make sure all DIP switches and jumpers are correctly set for the options that are connected to the computer Also mak...

Page 112: ...correct this condition by using another disk If this problem continues try booting from the other disk drive DISK ERROR Seek failure This error message indicates that the computer cannot read the disk...

Page 113: ...256 kilobit RAM devices and 1 bank bank I of 64 kilobit RAM devices Other RAM arrangements are also possible on these cards as explained in Chapter 2 Configuration CAUTION Many ICs are electrostatic s...

Page 114: ...13 HE 21 711 Capacitor ceramic 470 pF C214 not used C215 HE 21 811 Capacitor ceramic 0 33 uF C216 HE 21 811 Capacitor ceramic 0 33 uF C217 HE 21 811 Capacitor ceramic 0 33 uF C218 HE 21 786 Capacitor...

Page 115: ...pacitor ceramic 0 1 uF C245 HE 21 786 Capacitor ceramic 0 1 uF C246 HE 21 786 Capacitor ceramic 0 1 uF C247 HE 21 786 Capacitor ceramic 0 1 uF C248 HE 21 763 Capacitor ceramic 330 pF C249 HE 21 763 Ca...

Page 116: ...811 Capacitor ceramic 0 33 uF C279 HE 21 811 Capacitor ceramic 0 33 uF C280 HE 21 811 Capacitor ceramic 0 33 uF J C281 HE 21 811 Capacitor ceramic 0 33 uF C282 HE 21 811 Capacitor ceramic 0 33 uF C28...

Page 117: ...100kohm R208 HE 6 561 12 560 ohm R209 HE 6 561 12 560 ohm R210 HE 6 561 12 560 ohm R211 HE 6 561 12 560 ohm R212 HE 6 561 12 560 ohm R213 HE 6 561 12 560 ohm R214 HE 6 912 12 9 1 kohm R215 HE 6 103 1...

Page 118: ...HE 434 299 U206 HE 443 970 HE 443 1268 HE 434 299 U207 HE 443 970 HE 443 1268 HE 434 299 DESCRIPTION 4 7 kohm resistor pack 33 ohm resistor pack 33 ohm resistor pack 1 kohm resistor pack Pushbutton 2...

Page 119: ...HE 434 299 Socket U212 HE 443 970 64 kilobit RAM 6665 HE 443 1268 256 kilobit RAM 41256 15 HE 434 299 Socket U213 HE 443 970 64 kilobit RAM 6665 HE 443 1268 256 kilobit RAM 41256 15 HE 434 299 Socket...

Page 120: ...443 970 HE 443 1268 HE 434 299 64 kilobit RAM 6665 256 kilobit RAM 41256 15 Socket 64 kilobit RAM 6665 256 kilobit RAM 41256 15 Socket I ii U224 HE 443 970 HE 443 1268 HE 434 299 64 kilobit RAM 6665...

Page 121: ...ocessor 8087 2 optional HE 434 253 Socket U235 HE 443 1187 Microprocessor 8088 2 HE 434 253 Socket U236 HE 443 1073 Quad AND 2 input 74ALS08 HE 434 298 Socket U237 HE 444 358 Monitor ROM EPROM 27256 3...

Page 122: ...M 5320 Socket U249 U250 HE 443 837 HE 434 322 HE 443 837 HE 434 322 8 bit latch 74LS373 Socket 8 bit latch 74LS373 Socket I U251 HE 443 967 HE 434 298 Hex inverter 7406 Socket U252 HE 443 754 HE 434 3...

Page 123: ...71 HE 432 1041 HE 432 1231 HE 432 1495 HE 432 1382 HE 75 873 HE 85 3118 2 HE 204 2876 HE 250 1414 HE 255 757 DESCRIPTION Hex buffer 3 state 74LS367 Socket Buffer driver 3 state 74LS244 Socket Flip flo...

Page 124: ...E S7 QSI Sk lZOI4 2H4 5V 5 31 02 Oll 15 iiii GTI QSI 0 6 Z HC iiii fj IH4149 22 S2 READY Si 21 19 RES T Si CLK U234 ADI NC ADI NC 8087 AD2 r HC AD3 17 HC AD4 AI 27 A3I AI UlA INT ADS AD6 IRQ 18 8259A...

Page 125: ...4 IN MAH A17 fffi _ 33 4 5 A15 J A16 3 2 AEN All ADI AD7 or TRANS 1 r 5V B RP209 34 BUSV BHE S7 25 QSI 24 ADI 9 11 DI Gfj QSl U2 45 An ADI 8 12 Dl i iIliIG fi lS245 AI8 28 AD2 7 13 D2 S2 Al7 27 AD3 6...

Page 126: ...ji j 17 3 I 2 RPZ02 BDP Btl WI DIN 2 WI U24b iiAS DOUT 4m iIAl2 7 8 RPZ01 I III fA SH5 CAS Wi 1 RP20 5 Ii U20Z 2 ID7 UZll 2 2 SH5 HAl 7 HAl 6 IIAli 3 RPZ06 7 S e HAl DOUT DOUT 6 HAl eA i 6 RP20e 6 SH5...

Page 127: ...ID7 5 U220 2 ID7 7 MIll 7 MAl i MIll Dour 6 MAl Dour 6 MA2 12 M112 2 12 UZ z 1 2 ID6 U2 2 ID6 M113 I _II II MA3 I MAO Dour MAO DOUT II II MA MAS 13 UZ 3 2 IDS 13 Ulzz 2 IDS MA6 M06 9 9 HOl Dour MA7 DO...

Page 128: ...D D4 13 12 V D Q DS 14 15 D Q t NC WJ5C 9 CIJI 8 I m REsET S 19 7 Gl UZ58 DI 18 2 Sv Dl 16 4 RP203 U251l I n D2 14 6 5 15 LS241 6 lOW 1 7 Wi5A D3 3 17 IIATA A A Pi l 2 S 0 STROBE A AI D D4 9 II 12 8 5...

Page 129: ...E5i 5 ZS7 up 21 763 I I 16 17 18 f 19 f 21 f 21 f 22 f 23 f 24 f 25 STROiE AUTOI DXT iHiT SLC f 1N uzse 5 15 LS241 6 12 8 LS24 u258 4 15 fRiWR 13 SLCT 12 PE UZ43 2 1 LSI INTRENB 11 11 ACi BUSY 2 9 8...

Page 130: ...f S 7____ B D5 Lr 7 f _ BD4f S B D4 lr f _ _4 BD3 f 61 __ B D o 3 1r 5 f f _ BD2 r2 ____ B D2 Lr _4 f _ BDI rl ____ B D I 1 r c 3 f f _ _4 BD f I S____ B D lr 2 f f _ 080se f S I__ HII I Sp f b 24 Hz...

Page 131: ...C K I 117 B I A 1 ID3 13 12 r t __D A C K2 _C 126 ID4 DACKI r _ D A C K3 _C liS L SFB_ iG r I IDS 6 DACK2 ROW II IS ID6 SH5 ID7 DACK3 HA7 1 SH3 HA6 SH3 HAS SH3 MA4 LD2 SH3 MA3 SH3 BDI BD7 MA2 L A EN X...

Page 132: ...S S _ _ II i PB S4 1RQ 1 4 4 U Z51 4 2 _4 L OCH _ _ _ _ _ 3 r 1 1 R ADY _t _t_t_t __ IOW _ _ _ _ _ I IHTA 3B _ _ J PBI 4 _ _ J U25Z UZ48 TCLKr 3 t _ lOW 4 I lOW 4 Sv CPU I LS241 GATE ARRAY II UU 2 2 l...

Page 133: ...14L8 PI SH2 ffl 9 i LS2 A4 4 15 I 5 i CPO CQHTROL GCPU SHl A 5 IJZSZ A6 6 21 IHTRCS iHi iiCS SHI A7 7 16 i iim TMOCS SHI A8 8 17 GM GM A9 3 18 Wi I ROM 11 21 CPUGA I lOW 11 u2A3 GAJO lIEN 13 LSl4 12...

Page 134: ...SERVICE MANUAL Color Video Monitor ZCM 1490 7 NI H Idata systems 585 230 860 183...

Page 135: ...ice Bulletins SERVICE DATE BULLETIN OF CHANGED NUMBER ISSUE PAGE S PURPOSE OF SERVICE BULLETIN INITIALS LIMITED RIGHTS LEGEND Contractor is Zenith Data Systems Corporation of st Joseph Michigan 49085...

Page 136: ...be heard as the CRT discharges WARNING The switch mode power supply contains circuits that generate dangerous high frequency high amplitude quasi square wave signals that present a potentially lethal...

Page 137: ...4 9 CRT Cutoff 4 9 Video Gain 4 10 Final Checks 4 10 Contents Chapter 5 Circuit Descriptions Functional Overview 5 1 Video Input Processing 5 3 Video Amplifiers 5 3 Video Drivers 5 4 Cascode Output Am...

Page 138: ...val 3 7 8 6 Deflection Board Component View Assembly Removal 3 8 8 7 Horizontal Deflection High Voltage Board Removal 3 9 8 8 Vertical Deflection Mode Selection Locations 4 4 8 13 Dynamic Focus Board...

Page 139: ...IC Resistance Measurements 6 12 6 5 De flection Board Transistor Resistance Measurements 6 12 6 6 Deflection Board IC Resistance Measurements 6 12 6 7 Dynamic Focus Board Transistor Resistance Measure...

Page 140: ...31 49 kHz scan frequency The ZCM 1490 is il lustrated in Figure 1 1 Related publications include the High Resolution Analog RGB Color Video Monitor User s Guide 595 3924 1 Figure 1 1 ZCM 1490 Color V...

Page 141: ...layable colors is limited only by the video source supplying the monitor 80 characters x 25 rows 8 x 19 Zenith 9 x 16 VGA 8 x 16 MCGA 8 x 14 EGA 8 x 16 CGA 400 line 9 x 14 MDA 9 x 14 Hercules 25 42 Il...

Page 142: ...CENT horizontal centering H SIZE horizontal size V CENT verti cal centering V SIZE vertical size Environmental Temperature 0 to 40 C 32 to 104 F operating _40 to 60 C _40 to 140 F storage Humidity 10...

Page 143: ...CM 1490 Front View Chapter 2 Installation OUTLET H CENT H SIZE V CENT V SIZE cw TO 15 PIN RGB CONNECTOR ON COMPUTER Figure 2 2 ZCM 1490 Rear View Power The rocker type power switch located on the rear...

Page 144: ...al size control adjusts the height of the display within the screen area To in crease the display height turn this control counterclockwise To reduce the display height turn this control clockwise Pow...

Page 145: ...ssess the monitor s operation perform the color bar test and the fill screen test Both tests are ROM based Color Bar Test The color bar test displays an array of colors in the form of a bar graph To d...

Page 146: ...d dynamic focus boards 12 Remove the CRT WARNING The CRT anode retains a potentially lethal voltage even when the monitor is turned off After removing the monitor cover dis charge the CRT anode Before...

Page 147: ...e opening in the cover Tape the screws to the inside of the rear cover and set it aside Figure 3 2 Rear Cover Removal Rear Chassis Panel Removal Two panels are connected across the back of the monitor...

Page 148: ...the lower panel It may be necessary to cut the decorative white sheet on the outside of the lower panel to allow the strain relief to slide down and away from the panel Video Board Removal 1 Remove t...

Page 149: ...pan the width of the chassis To remove the PIN board 1 Loosen the support rails Refer to Figure 3 6 and remove the two hex screws holding each of the support rails in place 2 Cut the cable ties indica...

Page 150: ...efer to Figure 3 7 and remove the three hex screws that secure the fan and air guide to the bottom panel Remove the fan and disconnect the fan wires from the power supply board connector 3S8 I I BOTTO...

Page 151: ...s described earlier This step may be omitted for partial disas sembly 5 Remove the fan and bottom panel as described earlier 6 Remove the support bracket and shield as de scribed earlier 7 Refer to Fi...

Page 152: ...nd remove the nine hex The deflection board is attached to the left metal side panel To remove the deflection board from the side panel screws that secure the deflection board to the side panel Lift t...

Page 153: ...he video board as described earlier This step may be omitted for partial disas sembly 3 Remove the control board as described earlier This step may be omitted for partial disas embly 4 Remove the PIN...

Page 154: ...right metal side panel To remove these boards from the side panel 1 Remove the power supply dynamic focus board assembly as described earlier 2 Refer to Figure 3 12 and remove the appropriate hex scre...

Page 155: ...s wrapped around the perimeter of the CRT A ground ing braid is also routed across the back of the CRT I I Refer to Figure 3 13 for the lead dress To remove the CRT remove the four hex screws with was...

Page 156: ...top R2148 Vertical centering rear panel R2153 Vertical size rear panel R3402 Horizontal size rear panel R3418 Horizontal centering rear panel Video output board R5139 Blue gain R5154 Red gain R5316 R...

Page 157: ...303 0 M M M E5303 E5302 a Q J M O 0 N N tO 2 en u u 0 0 t a 0 E M E5304 M o o 0 en 0 U M N Lt on Lt E5301 en N N M a O Q o o 0 M T U 0 A N co N en en en a 0 a o U 1 4 0 RED 0 05205 Pi D R5140 o g 0 l...

Page 158: ...VERTICAL SUB SIZE 480 180 R3420 HORIZONTAL PHASE 111111 Q 0 Cl HORIZONTAL HOLD OJ CIiI O O Figure 4 2 Deflection Board Adjustment Locations c ro co l w R3238 HIGH VOLTAGE SHUTDOWN OPTONAL R3418 HORIZO...

Page 159: ...M R7027 E W LEVEL SOUTH LEVEL HORIZONTAL SIZE IC701 TRIM OPTIONAL E W PHASE Figure 4 3 PIN Board Adjustment Locations c T7701 C7701 0 00 0 l7701 77 710 I I o Q7703 DRllOH R7711 I C7703 u O Rl107 R7 70...

Page 160: ...rwise proceed to the Pincushion Adjustments section and follow the steps indicated there If the display appears symmetrical and undis torted it is likely that the pincushion correction cir cuitry is a...

Page 161: ...prevents the display from rolling upwards or downwards To adjust the vertical hold 1 Adjust R2117 to stabilize the display by turning it first to one extreme and then backing off until the display jus...

Page 162: ...harpen the display detail To adjust focus 1 Display a dot test pattern refer to the Inspection and Preparation section of Chapter 6 for the procedure Alternatively perform the fill screen test using t...

Page 163: ...e middle portion of the line 4 Adjust the south level control R7434 to reduce any PIN distortion at the center of this line That is use this control to reduce any bowing in the middle portion of the l...

Page 164: ...and right edges of the display 5 Adjust the E W phase control R7039 to obtain the straightest possible vertical lines along the left and right sides of the display 6 Use both the crosshatch pattern a...

Page 165: ...ons of the CRT gun waveforms in Figure 4 6 up or down When set properly aU three RGB drive voltages should be the same To adjust the video gain Page 4 10 1 Use the fill screen test to fill the display...

Page 166: ...d that all cables are properly routed to adjusted and operating properly avoid pinching or excessive heat 6 Leave the monitor turned on for at least one 4 Make sure that all mounting hardware barriers...

Page 167: ...the block diagram in Figure 5 1 when reviewing the overall operation of the monitor Refer to the waveform photographs in Chapter 8 where Chapter 5 Circuit Descriptions noted Where appropriate partial...

Page 168: ...contains RGB amplifiers brightness and contrast control automatic brightness limiter and video blanking circuits Analog signals containing color information are supplied to the monitor along with hori...

Page 169: ...nals enter the video output module at connector SR9 These signals are DC terminated by 7SQ resistors R51 01 R51 02 and RS1 03 The color signals are then AC coupled to the video inputs of ICS101 by ca...

Page 170: ...noted earlier the incoming analog color signals are AC coupled to the inputs of IC51 01 The DC component of the video signal is then restored as fol lows During the horizontal and vertical retrace int...

Page 171: ...red composite blanking pulse from pin 11 of IC5102 is applied to the base of 051 01 The output of this emitter follower stage is applied to diodes CR5203 CR5207 and CR5211 In the pres Circuit Descript...

Page 172: ...and the capacitor discharges The vertical hold con trol R2117 controls the threshold voltage at pin 3 thereby changing the free running frequency of the oscillator The external vertical size control...

Page 173: ...e trace at the left side of the raster Diode CR3003 conducts during this time producing part of the trace at the left side of the raster and reducing the average amplifier current thus increasing effi...

Page 174: ...between the the reference and feedback voltages at its input terminals 03205 drives regulating transistors 03204 and in turn II 03205 03206 provides additional feedback to insure f a stable regulated...

Page 175: ...s This in turn activates retrace switch transistor 02109 During the scan time prior to retrace C2119 in the emitter circuit of 02109 charges to about 72 V through RX2139 RX2138 and CR2112 When 02109 i...

Page 176: ...west waveform generator an east west regulator a north south waveform gen erator and a north south output circuit Each block is explained individually in the following sections East West Waveform Gene...

Page 177: ...ust also produce the proper correction waveform regardless of changes in horizontal and vertical display sizes A vertical size change is automatically compensated for because the vertical ramp amplitu...

Page 178: ...urrent to the horizontal deflection circuit and drops the voHage In this manner the E W PIN correction waveform is su perimposed onto the horizontal scan voltage North South Waveform Generator The nor...

Page 179: ...at the base of 07407 causes this transistor to conduct thereby discharging C7417 To stabilize the DC bias point of C7417 the current source 07409 is DC modulated by feed back from 07410 The parabolic...

Page 180: ...h the vertical yoke Dynamic Focus The dynamic focus circuitry varies the focus voltage at the horizontal rate so that the voltage at the raster edges is increased and the voltage at the center is decr...

Page 181: ...bles when specific circuits are suspected or when the monitor cannot be turned on for tests In the ZCM 1490 measurements on the deflection board cannot be made safely while the monitor is on To gain a...

Page 182: ...est Repair and reassembly of the monitor can inad vertently result in the loss of electrical isolation be tween the AC power wires and the exposed metal parts of the monitor If this isolation is lost...

Page 183: ...ix Model 2235 or equiv alent Oscilloscope probe low capacitance 4 ns rise time Heath Model PKW 105 or equivalent Digital voltmeter high impedance input 0 to 1000 V 0 to 1 megohm Heath Model SM 2215 or...

Page 184: ...erforming display adjustments The diagnostics are menu driven A general procedure for using the diagnostics follows For further information about the disk based diagnostics refer to the documentation...

Page 185: ...appropriate schematic as you work through the steps of a troubleshooting chart While these charts are designed to assist in diagnosing faults they cannot substitute for the information con tained in...

Page 186: ...NITOR ON DESCRIPTIONS FOR DISPLAVON CD SPECIFIC PROBlEMS 0 0 NO VERTICAL OSCILLATOR CIRCUITS HORIZONTAL PROCESSOR AND DEFLECTION CIRCUITS VERTICAL OSCIULATOR AND DEFLECTION CIRCUITS Figure 6 3 I a c c...

Page 187: ...SSING Q G ADJUSTMENTS OR 0 OK NO SUSPECT OUTPUT CHECK 4 5 YES OR DRIVER OR 0 OK r TRANSISTORS NO SUSPECT IC51 01 CHECK G 0 OR 0510515106 OR OK OSl 07 S1 08 05109 5110 NO SUSPECT COMPONENTS BETWEEN SR9...

Page 188: ...ED HIGH VOLTAGE PRESENT TEST SCREEN WITH HAND FOR STATIC ELECTRICITY NO SUSPECT HIGH VOLTAGE COMPONENTS LIKELY TO BE STRESSED 03203 03202 CHECK TP3 SHUTDOWN CIRCUIT AND 208 DISPLAY ADJUSTMENTS OK NO P...

Page 189: ...AGE AND RESISTANCE MEASUREMENT TABLES TO ISOLATE A FAULTY COMPONENT AFTER IDENTIFYING THE FAULTV STAGE SUSPECT IC7001 SUSPECT C7417 07405 07407 07409 07404 07408 IC7401 USE VOLTAGE AND RESISTANCE TABL...

Page 190: ...6 NA 3R4 16 8 GND 6 NA NA 3R7 8 GND NC NA NA NA IF VOLTAGES ARE MISSING REPLACE POWER SUPPLY DO NOT ATIEMPTTO SERVICE THE POWER SUPPLY CHECK POWER CORD OK NO I REPLACE I CHECK POWER I SUPPLY FUSE OK...

Page 191: ...ts PIN IC7001 IC7101 IC7401 IC7402 IC7501 IC7502 3 96kn 1Mn 4Mn 9 26kn on 36 Skn 2 5 37kn 6 7kn 4Mn 3 4Mn 10 5kn 3 5Mn 3 3 24Mn 8 3kn 3 9Mn 3 4Mn 3 3Mn 10kn Table 6 2 continued PIN Board IC Resistance...

Page 192: ...1301 IC2101 IC2103 IC3201 IC3401 Table 6 5 Deflection Board Transistor 1 5000 3 68Mo 3 4Mn 39 5kn 1600 0 Resistance Measurements 2 600 0 95kn 55kn 10 7ko 5500 3 700 0 14kn 73kn 0 322Mo 4 65kO DEVICE E...

Page 193: ...e Measurements 07001 1 19V 0 61V 10 6V 07007 8 73V 8 13V 0 87V DEVICE EMITTER BASE COLLECTOR 07008 8 41V 7 81V 1 3SV 07009 0 315V 0 93V 16 6V 05201 0 80V 1 55V 4 50V 07401 1S SV 16 29V 7 S1V 05202 4 5...

Page 194: ...86C 1000pF 10 500V chip ceramic disc C1303 022 08003 02A 0 1IlF 5 50V ceramic C2118 022 07864 04A 4 7IlF 20 100V chip electrolytic C1304 022 07859 05A 101lF 20 16V C2119 022 07864 06 221lF 20 100V ele...

Page 195: ...S 100V polyester C3217 022 07773 16 0 022I1F 5 100V polyester Page 7 2 Table 7 1 continued Designated Components Parts List REFERENCE ZENITH PART NUMBER NUMBER DESCRIPTION Capacitors continued C3218...

Page 196: ...eramic tubular leadless tubular leadless CS108 022 07991 A 2200pF 10 16V CS20S 022 08039 03A 10000pF 20 2SV ceramic tubular leadless ceramic tubular leadless CS109 022 07860 0SA 10jlF 20 2SV CS207 022...

Page 197: ...C7414 022 07773 08 0 0047jlF 5 100V electrolytic polyester C7010 022 07862 01 A 1JlF 20 SOV electrolytic C741 5 022 07773 24 0 1 jlF 5 100V C7012 022 07405 06 22JlF 10 2SV NP polyester electrolytic C7...

Page 198: ...polyester CR2101 103 00398A Si general tubular C7514 022 07860 12 470J l F 20 25V leadless electrolytic CR21 02 103 00398A Si general tubular C7515 022 07613 11C 820pF 10 50V ceramic leadless disc CR2...

Page 199: ...R51 05 103 00399 1 OA Zener 5 1 V 0 5W tubular CR3003 103 00431 Si high frequency leadless 114 0132S 03 Screw 4 24 x 0 312 hex CRS201 103 00398A Si general tubular head leadless CR3004 103 00399 38A Z...

Page 200: ...il RFC filter CR7410 103 00142 01 Si general L7401 020 03849A Coil RFC tunable CR7501 103 00142 01 Si general L7701 020 03831 A Coil RFC CR7502 103 00142 01 Si general CR7504 103 00308 Zener 12V 0 5W...

Page 201: ...01037 01 NPN Si 07009 121 00895A NPN Si 03205 121 01037 01 NPN Si 07103 121 01037 01 NPN Si 03206 121 00895A NPN Si 07104 121 01037 01 NPN Si 03207 121 00973A PNP Si 07105 121 01072 01 NPN Si TI I 032...

Page 202: ...ol rotary trimmer R1314 063 11020A on 5 1 4W film black tubular leadless R2125 063 10934 99 732n 1 1 4W film R1315 063 11020A on 5 1 4W film R2126 063 10934 86 562n 1 1I4W film tubular leadless R2127...

Page 203: ...tubular leadless R3006 063 10243 24 10 0 5 1 2W film R2158 063 11052 08 Control rotary trimmer R3007 063 10243 06 1 8 0 5 1J2W film black R3008 063 10442 56 22 0 5 5W wirewound R2159 063 11020 73A 1k...

Page 204: ...ar leadless tubular leadless R3218 063 11020 97A 10k 5 1 4W film R3246 063 11021 14A 5 1 k 5 1 4W film tubular leadless R3248 063 07799 2 2kn 10 1 2W carbon R3219 063 10243 66 560n 5 1 2W film composi...

Page 205: ...1 2W film tubular leadless R3417 063 11020 97A 10kn 5 1 4W film R5110 063 10S36 56 220n 5 2W film tubular leadless 194 01987 Spacer ceramic tube R3418 063 1 OS54 1 0 Control rotary trimmer R5111 063...

Page 206: ...ss tubular leadless R5161 063 10979 24A 100n 5 1 8W film R5136 063 10979 39A 470n 5 1 8W film tubular leadless tubular leadless R5162 063 10979 S1A 30kn 5 1 SW film R5137 063 10979 24A 100n 5 1 8W fil...

Page 207: ...1 2W film R5218 063 11020 45A 68n 5 1 4W film R5316 063 10651 30 Control rotary trimmer tubular leadless R5317 063 1 0651 30 Control rotary trimmer R5219 063 10979 20A 68 Q 5 1 8W film R5318 063 10651...

Page 208: ...7A 10kn 5 1 4W film R7118 063 10243 72 1kn 5 1 2W film tubular leadless R7119 063 10243 88 4 7kQ 5 1 2W film R7020 063 11020 65A 470Q 5 1 4W film R7120 063 10836 88 4 7kn 5 2W film tubular leadless 08...

Page 209: ...7427 0G3 11 020 97A 10kn 5 1 4W film tubular leadless tubular leadless R7452 063 11 020 97A 10kn 5 1 4W film R7428 063 11020 49A 1000 5 1 4W film tubular leadless tubular leadless R7453 063 11 020 49A...

Page 210: ...ilm R7704 063 1 0236 30 270kn 5 1 4W film R7518 063 11 020 73A 1kn 5 1 4W film R7705 063 1 0235 80 2 2kn 5 1 4W film tubular leadless R7706 063 10236 13 51 kn 5 1 4W film R7523 063 11020 97A 10kn 5 1...

Page 211: ...5 connector and cable N A 009 00695 01 Module PIN Focus assembly N A 009 00712 01 Module Deflection N A 050 01783 4T8 connector and cable N A 009 00740 Module Dynamic Focus assembly N A 011 00355 Powe...

Page 212: ...0 375 type B black oxide flat head phillips four insulators to 0 p crossbrace rear Screw machine 6 32 x 0 500 ZD pan head phillips Screw machine 10 32 x 2 125 ZD x 0 312AF hex head with washer NUMBER...

Page 213: ...w thread forming 6 32 x 0 310 type B ZN 0 250AF hex head with washer contact spring to power supply bracket N A 114 01483 03 Screw thread forming 6 32 x 0 310 type B ZD 0 250AF hex head with washer co...

Page 214: ...Figure 7 1 Exploded View Parts List Page 7 21...

Page 215: ......

Page 216: ...anation This chapter contains all waveform photographs re ferred to throughout the manual Figure 8 1 and the notes that follow it explain the waveform display win dow and oscilloscope settings All wav...

Page 217: ...be varied on the vertical able reference cursor dotted line G and the axis to provide a reference for the delta voltage variable data cursor dotted line F This value when displayed indicates the peak...

Page 218: ...CRT RED 8 CRT GREEN 8V 8V 10 05101 EMITTER 11 IC7001 PIN 2 12 IC7001 PIN 14 14 IC7101 PIN 1 13 8U6 PIN 5 07505 BASE 15 07103 COLLECTOR 17 07402 BASE 16 07105 EMITTER 18 07410 BASE Schematics and Wavef...

Page 219: ...RD 20 IC7501 PIN 4 21 IC7501 PIN B 22 IC7502 PIN 6 ENVELOPE 23 IC7502 PIN 6 CARRIER 24 IC7503 PIN 4 ENVELOPE 25 IC2101 PIN 1 26 IC2101 PIN 7 27 IC2101 PIN 5 28 TP3 DEFLECTION BOARD Page 8 4 Schematics...

Page 220: ...o 0 0 N C E5301 o 0 0 A N 0 N H 0 RED Figure 8 2 R5319 0 VIO BLK 0 M O OG2 G1 a 0 E5303 a E5302 CJ M a a 0 N o o 0 Q5205 5A6 Video Board Component View Component Side 0 N N a u E A 0 k j 0 R5154 J o...

Page 221: ...R520B U R5224 D __ c R5214 CRS211 N N o O CJ 01 D Eit Iill u a 1t 0 o CRS20S u R5203 C5202 R5202 1J aT R5201 C5201 H o CO W 0 0 01 It I t U a N R5227 CI a 0 U D 5320 u u Figure 8 3 Video Board Compone...

Page 222: ...NTRAST 2 R5136 CR5304 C5111 8VDC 470 8VDC 22 25V I CO R5113 8VDC SAl 10 39k 05301 I R5114 R5111 8 2k IPROV C5119 R5158 10 16V I 88VDC R5110 NP 30k 220 2 1 7 8VDC R5212 CRSI07 CSI09 CSI08 820 RS214 R53...

Page 223: ...V CUTIFf P1LSE 05304 FROM IC5102 R5213 R5214 R5304 820 100 1 4 1 1M CR5302 2 1 Q5207 R5305 R5306 220 ISO 1 2 1 COMP E5303 05305 1 E5301 h FlAT TEONLDGY CRT G2 R5310 R5206 R5301 lOa 1M CR5304 l 4 5k 88...

Page 224: ...Figure 8 5 Deflection Board Component View Component Side Schematics and Waveforms Page 8 9...

Page 225: ...I m H D 1 CJ 0 U moll 1 d O R21 9 20 CO 0 y Figure 8 6 Deflection Board Component View Foil Side 1 Page 8 10 Schematics and Waveforms I...

Page 226: ...18 I 2 7k 500V 31 t C3012 a C3013 a 4 7 I 0 1 100V 2 3 R3009 R3415 OPT 22 1121 S R3010 R3011 P C3007 II 0 47 200V 10k lk 16VDC 16VDC 100V U HOR1Z SYNC FROM 1C3401 R3232 5 6k H1 V SHUTDOI N NV FROM Q32...

Page 227: ...2k R3238 I 0 1 50V 100 100 500V 50V HIGH VOLTAGE R3253 SHUTDO JN 47 JU4 ADJUST R3258 R3220 A 15412 1 5k 16 5k 1 R3254 120 JU5 C3225 JU8 TO CRT ANODE 01 R3255 220 JU6 R3256 330 JU7 22 CR3214 R3239 2 0...

Page 228: ...k 0 068 I CRI307 Ar R216S HIIRIZ 100V CR2121 12V Ik R3410 5 IVCD C3402 HIILD 5 IV R2172 0 9 76k 16VDC M RI310 4 7k f Igo I IX r 470 tR214S RI304 RI315 R2174 u 100 IIIUZ 510 0 Ik I L i SYNC CR2122 12 5...

Page 229: ...3uH R3421 62k I r ________________________________________________________________________________HIIRIZ nR 2 3 16VDC 88VDC 4 RX2139 330 fROM C3403 12VDC R2144 r 10k Q210lE 16VDC Pt U 2101 0 0024 C211...

Page 230: ...Figure 8 9 PIN Board Component View Component Side Schematics and Waveforms Page 8 15...

Page 231: ...Ill ID 170 1 1 D 0 B 11 2 i 1It7704 03 o IHOB P 7110 RHOl r l Rl101 CJ L J DA103 RISOl r 0 0 7 1 B An DO D A1518 RH33 A754b 0 1S3j DD 117529 7S 32 Figure 8 10 PIN Board Component View FOil Side Page...

Page 232: ...012 R7011 68k R7001 lOOk ___ 1 V0 0 k 4t __8 l Y I V v 5 12k E_ vI TRAP R7010 R7008 R7028 10k IC7001 3 3k 15k R7002 16VDC 6 10k Y 10 C7001 4 22 25V C7007 VERTICAL NP R7003 100 25V NP RAMP III IHi R701...

Page 233: ...21 1 21 1 R710B C7102 220pF C7104 j 710l R7106 10 2k loO R711 Q 15V 5k I o I U 37 4k V HDRIZ R7112 SIZE 1M I o 8 R7117 R7039 2 2k lOOk HDRIZ SCAN E V 8V6 PIN 2 PHASE R7028 C7105 16 1 C7107 15k GlOO 4...

Page 234: ...r 10k 9 R7421 R7447 R7446 I C7418 R7451 16VDC 3 9k 2 7k 1 5k I 0 1 i g0 b i CR7505 R7507 f R7454 R7456 560 R7453 5 6V 10k 12 I _ _ 2 t INv l 100 6 12 S K Q7409 R7541 14 _ R7419 n113 Ik L7401 C7420 5 R...

Page 235: ...9 10k CR7502 B20pF I 1 2 R7507 10k 12 C7505 IC7501 R7511 0 1 6 8k R7541 3 I 16VDC RX7536 470k vec I 112 TO R7525 R7545 R750B 2 2k 10k 8 R7516 66 5k 1 R7510 2 7k R7517 R7542 I1 Bk 1 10k 4 C7517 R7518...

Page 236: ...04 R7706 L7701 270k Slk 630uH Q7703 R7703 270k R7710 R7709 DYNAMIC 10k T7701 11 112 1 C7701 8RS 022 rocus R7707 BDARD 10k IOOV R7701 10k Figure 8 14 Dynamic Focus Schematic R5401 5k EXTERNAL 5Al 7CDNT...

Page 237: ...SERVICE MODULE Color Video Floppy Controller Card Z 100 PC Series Computers Part Number 181 5312 7 lUnldata systems 585 104 01...

Page 238: ...Record of Field Service Bulletins SERVICE BULLETIN NUMBER DATE OF ISSUE CHANGED PAGE S PURPOSE OF SERVICE BULLETIN INITIALS I UMITED RIGHTS LEGEND Contractor is Zenith Data Systems Corporation of St J...

Page 239: ...10 CRT Controller Registers 3 10 Programming the Registers 3 11 Raster Scan Signals 3 15 Video I O Devices 3 16 Programming Sequence 3 21 Detailed Circuit Description 3 22 Video RAM Address Multiplex...

Page 240: ...rt Assignments 3 16 3 4 Video I O Port Selection 3 16 3 5 Color Select Register Logic 3 17 3 6 Color Palette Number 1 Selection 3 18 3 7 Color Palette Number 2 Selection 3 18 3 8 Mode Select Port 3D8...

Page 241: ...isk Controller Block Diagram 3 3 3 3 Horizontal Timing and Format 3 13 3 4 Gate Array Block Diagram 3 27 4 1 Video Output Adjustment Waveform 4 9 5 1 Component View 5 1 5 2 181 5312 Schematic Sheet 1...

Page 242: ...face between the computer and various display output devices including a monochrome and a color monitor The monochrome output connects to an RCA phono jack and the RGBI output connects to a 9 pin D ty...

Page 243: ...nd and border Text mode all points addressable graphics 256 character 7 or 14 MHz mode dependent Monochrome and or color RGBI External vertical horizontal and or composite with selectable polarity Blo...

Page 244: ...SD Exer cise extreme care when handling these devices to prevent damage Configuration Make configuration selections by positioning jumpers and switches on the Color Video Floppy Controller Card Figure...

Page 245: ...Pen Configuration JUMPER DESCRIPTION JUMPER PINS J301 Light pen polarity positive edge 2 3 negative edge 1 21 J302 Ext monitor vertical sync composite sync 2 3 pure vertical sync 1 21 J303 Ext monitor...

Page 246: ...witch position Installation Steps NOTE Do not attempt to replace the two individual cards Video and Floppy Controller with this 181 5312 Video Floppy Controller card 1 Using the current Z 150 computer...

Page 247: ...oppy Controller Card 6 Connect the internal monitor cable Z 160 only to P303 see Figure 2 2 7 Install the disk drive cover assembly Z 160 only 8 Connect external device cables to P305 Composite Video...

Page 248: ...s Communications Element ACE and a data transceiver see Figure 3 1 The ACE accepts parallel data at the onboard DBa through DB7 bus inputs and converts the data to serial format for transmission The A...

Page 249: ...e Receiver Line Status is of the highest priority followed by the Received Data Ready Transmitter Holding Register Empty and MODEM status conditions The interrupt signal is issued at pin 30 INTRPT of...

Page 250: ...operations and interrupt requests Data can be transferred using DMA capabilities or by generating interrupts for each data byte DRIVE 0 SELECT DRIVE SELECT DRIVE 1 SELECT MUX CONTROL I LATCH I DRIVE M...

Page 251: ...al status register AD D of U3DS to transfer its contents to the on board DBD through DB data bus Direct Memory Access DMA The floppy controller originates a request for a direct memory access to the D...

Page 252: ...and DB7 are latched and then NORed by pin 13 of U301 to provide the data input to pin 1S of U312 The decoded disk drive select signal DSO DS1 DS2 or DS3 is transmitted to the disk drive through pin 1...

Page 253: ...signal is interfaced to the disk drive through pin 20 of connector P301 After the head is stepped to a different track and encounters track 0 the TRACKO Signal be comes active low and forces pin 4 of...

Page 254: ...e write cycle pin 39 of U305 is in a low state enabling pin 11 of NOR gate U306 If the disk being used has a write protect tab on it a low signal will result at pin 12 of NOR gate U306 The output at p...

Page 255: ...h provides timing signals to flip flop U315 and binary counter U317 The counter provides di vided frequency outputs to floppy controller U305 the delay flip flop U313 and the write precompensation fli...

Page 256: ...s9d register may be accessed The read write Signal It determines whether data is to be written into or read from an internal register RIW is low for a write opera tion high for a read operation The en...

Page 257: ...PEN is low during horizontal and vertical retrace and also could be called the video blanking signal CURSOR is the cursor enable signal which allows a steady stream of dots to be produced on the CRT s...

Page 258: ...DR NO TYPE UNITS STAT TEXT TEXT MODE 0 RO Horiz Total Char Write 38 71 38 1 R1 Horiz Dispd Char Write 28 50 28 2 R2 Horiz Sync Char Write 2D 5A 2D Position 3 R3 Horiz Sync Char Write OA OA OA 4 R4 Ver...

Page 259: ...interfaced Horizontal Timing and Format Registers The contents of register RO determines the total time allotted for one scan line in terms of character clock ClK cycles total of displayed and undisp...

Page 260: ...row can consist of up to 32 scan lines it may be difficult to establish a refresh frequency close to the line frequency Register R5 a 5 bit VSYNC adjust register then may be used to fine tune the VSYN...

Page 261: ...rsor symbol is to be activated The scan line specified in R10 is the first scan in which the CURSOR signal is to be set and it will remain set until the scan line specified in R11 has been completed A...

Page 262: ...5 These registers are the 6845s only read write registers so they also can be used to keep track of the cursor position rather than copying this information from another memory location R16 and R17 ar...

Page 263: ...5 A4 A3 A2 A1 AO 3DO 0 0 x x 0 3D1 0 0 x X 1 3D8 1 0 0 0 0 3D9 1 1 1 0 0 0 1 3DA 1 1 1 0 0 1 0 3DB 1 1 1 0 0 1 1 3DC 1 1 0 1 0 0 x Don t care The 6845 CRT controller occupies two I O port addresses Th...

Page 264: ...t mode or 640 x 200 graphics dot color Bit 2 R red border color select text mode or 640 x 200 graphics dot color Bit 3 I intensity intensifies border color text mode or 640 x 200 graphics dot color Bi...

Page 265: ...1 color is determined by the logic of Table 3 6 Table 3 S Color Palette Number 1 Selection C1 CO COLOR 0 0 Defined by bits 0 3 of 1 0 port 3D9 0 1 Cyan 1 0 Magenta White If bit 5 is a logical 0 color...

Page 266: ...t 30B functions according to the logic of Table 3 B Table 3 B Mode Select Port 308 Logic MODE o BITS 2 3 4 5 40 x 25ALPHAB W 40 x 25 ALPHA COLOR 80 x 25ALPHAB W 80 x 25 ALPHA COLOR 320 x 200 B W GRAPH...

Page 267: ...t selection Least significant bit LSB Bit 2 A logical 1 enables underline in text mode when Attribute bit 6 is a logical 1 Bit 3 Not defined Bit 4 A logical 1 selects Z 319 video Bit 5 A logical 1 ena...

Page 268: ...s address activated no specific data need be output Bit2 A logical 0 indicates that the light pen switch is on The switch signal is not latched or debounced Bit3 A logical 1 indicates that a vertical...

Page 269: ...provide the Register Select RS signal to pin 24 of U325 When RS is low the address register is selected and when RS is high the data register is selected lID Signals The CRT controller U325 provides v...

Page 270: ...gnals present on the AO through A13 bits of the main address bus to derive video RAM address bytes Detailed Circuit Description Each multiplexed output of U326 U327 U333 and U334 supply two bits of da...

Page 271: ...e byte of data is retained by the RAM as the row address byte A few nanoseconds later a second six bit multiplexed address byte VMA1 through VMA6 is latched by the RAMs when the Column Ad dress Select...

Page 272: ...write cycle Refresh Data contained within the memory locations of the RAMs U331 and U332 must periodically be refreshed so that data is not lost During the refresh cycle pin 16 of the gate array provi...

Page 273: ...esented is used to select a desired character from the font The data byte output from the ROM is latched onto the GAO through GA7 data bus by flip flop U328 during the time when the ROMG signal from p...

Page 274: ...UX STATE STATE t t Z z III W Z W l Z x w J Z a l 0 J J J J X Z Ci l ID l MODE SELECT SIGNALS TO FROM GA 0 7 VIDEO RAM U lJ l ATTRIBUTE III CHARACTER HOLD HOLD REGISTER jlD REGISTER I r I I 0 0 I I 0 a...

Page 275: ...ray 16 NRFSH Enables RAM refresh cycle 17 34 51 68 5VDC Gate array power source 19 CAS Column Address Strobe high during refresh cycle 20 RAS Row Address Strobe active signal that refreshes RAM 21 RA1...

Page 276: ...D Select 0 SO input to video RAM address multiplexers 37 CPU Select 0 SO input to video RAM address multiplexers enables memory WRITE operation 38 TO Video RAM address multiplexer input 39 T1 Video RA...

Page 277: ...ing system Bus selection is determined by an internal three state device The video I O ports act as mode select registers to configure the video interface for the desired operation They determine medi...

Page 278: ...gister The attribute data byte is internally latched and multiplexed with internal control signals The byte output of the attribute multiplexer is loaded into the attribute serialization register Data...

Page 279: ...ground colors 0 Select 1st color of preselected color palette 1 or 2 see above 0 Select 2nd color of preselected color palette 1 or 2 see above Select 3rd color of preselected color palette 1 or 2 see...

Page 280: ...zontal and vertical sync display delay DSPDLV cursor delay CASDLV cursor blink CASBLNK and character blink CHAABLNK signals to the internal AGBllogic of the gate array Video Output The AGBI data from...

Page 281: ...there are no active DOT signal outputs from multiplexer U342 the output at pin 8 of OR gate U346 goes low effectively cutting off transis tor 0301 so that the video signal is blanked Horizontal and Ve...

Page 282: ...the value of each capacitor is 56 picofarads Capacitors C362 C363 and C364 in conjunction with inductor L301 provide filtering and decoupling of the 5 VDC supply before use by the video output transi...

Page 283: ...A9764 lAS A5 A3 COMEN ICOM1 IAEN CSGA A9764 AS IA5 A3 VIDEN IAEN CS6S45 A9764 AS IA5 IA3 VIDEN IAEN SELOUT A9764 AS A5 IA3 A9764 AS A5 A3 COMEN COM1 A9764 lAS A5 A3 COMEN ICOM1 A9764 AS IA5 VIDEN XCV...

Page 284: ...Video RAM address decode SELOUT feedback Bus 1 0 Write Bus address I A9 A7 A6 A4 Bus address bit A8 Bus address bit A5 Bus address bit A3 Bus DMA Address Enable Enable Video switch 4 Enable COM port...

Page 285: ...ntroller A12 A31 A19 AO Address bit 19 through address bit O B1 GND Ground B2 RESET When high resets or initializes system logic devices B3 5VDC 5 VDCbus B4 IRQ2 Interrupt Request 2 Not used but avail...

Page 286: ...d to parallel interface 822 IR06 Interrupt Request 6 Assigned to floppy disk controller 823 IR05 Interrupt Request 5 Assigned to Winchester drive con troller 824 IR04 Interrupt Request 4 Assigned to s...

Page 287: ...bugging routines of system ROM Refer to the ROM Diagnostics chapter in the Base Unit Service Module for details on the use of these routines An abundance of useful information is included in this chap...

Page 288: ...S literature for this computer A null modem cable must be used which is supplied under the HCA 50 51 and 52 catalog numbers 2 If the correct cable is being used run the CONFIGUR utility supplied with...

Page 289: ...rate U322 L322 C322 COM1 COM2 U316 THINGS TO CHECK Active low ACE chip select 1 0 write control signal Output signals Check for base frequency of 1 8432 MHz Check for proper signal gating Pin 15 dete...

Page 290: ...r sequencing With autoboot switched off see CPU card switch settings the OSK light on the CPU card should be the last light to go out except for the ROY light which will remain lit until a disk has be...

Page 291: ...unformatted disk wrong format CP M instead of MS DOS or wrong operating system Z DOS instead of MS DOS The sector not found error message also may indi cate a data disk non bootable disk In any of the...

Page 292: ...ator is buffered by an active inverter which may also fail 8 If the read operation is found to function properly when using a known good disk but is reading erroneous data after a write opera tion it...

Page 293: ...3 U338 U302 U305 U310 U314 U315 U306 U311 U317 U304 U314 U315 U305 U308 THINGS TO CHECK Bus interlace FDCIC Signal buffers Logic gates Signal decoder Check pulse width after last access It should last...

Page 294: ...hrome composite vertical or horizontal sync No horizontal or vertical sync No horizontal sync Mismatched colors with missing intensity Background colors incorrect No RAM data output Cursor not blinkin...

Page 295: ...onnector P305 Connect oscilloscope external sync input to pin 5 of P303 HS Obtain a stable waveform resembling Figure 4 1 Figure 4 1 Video Output Adjustment Waveform Adjust black level control R319 fo...

Page 296: ...service module contains a component view of the Color Video Floppy Controller Card part number 181 5312 and related parts list Refer to Figure 5 1 for location of parts and components NOTE The symbol...

Page 297: ...314 HE 21 786 1 jl F ceramic C350 HE 21 786 1 jl F ceramic C315 HE 21 786 1 fJ F ceramic C352 HE 21 786 1 jl F ceramic C316 HE 21 786 1 jl F ceramic C360 HE 25 197 1 jl F tantalum C317 HE 21 786 1 jl...

Page 298: ...5 H R31S HE S 122 12 1200 ohm L349 HE 235 299 RF choke 35 H R317 HE S 102 12 1000 ohm L374 HE 45 S3S RF choke 3 2 H R318 HE S 102 12 1000 ohm R319 HE 10 1204 1000 ohm linear control Connectors R320 HE...

Page 299: ...443 1031 Flip flop octal D 74ALS574 U309 HE 443 730 Flip flop dual D 74LS74 HE 434 311 20 pin socket HE 434 298 14 pin socket U310 HE 443 728 Quad 2 input NAND gate U331 HE 443 1219 DRAM 16K x 4 4416...

Page 300: ...pin socket HE 434 299 16 pin socket U343 HE 443 732 8 input NAND gate U350 HE 443 795 Receiver RS232 HE 434 298 14 pin socket HE 434 298 14 pin socket U344 HE 443 1196 Hex driver HE 434 298 14 pin so...

Page 301: ...05 1 6 All I 39 11 706 1 8 07 1 75189 1 8250 sour 11 U351 6 L RTS 32 10 AO U339 11 Z8 AO A 27 L U339 6 I U33 t 3 6 A2 33 OTR CS82 O U338 18 4 IT U351 11 IIOWDlY I t5V U309 8 DOSiR rKLK tJ 7SIS8 IIORD...

Page 302: ...IECTOR 4 ROY TO SEND I 5 CLR TO SEND I 6 DATASSET ROY I r 7 SIGNALG4D 8 CARRIER DETECT 20 DATA TER INAL ROY 2 RING DETECT ALL OTHER PINS N C B rn 1J307 2 0 O IB4 825 J309 1 0 3IB24 COM2 COM1 31O iI 8...

Page 303: ...PS1fL IORDLY V 23 U30 RD RD IIOWOLY 3 9_8 ROW 22 U O WR 5 AD VCD 2 U339 II ICS765 ROf c AD RESE U3 17 I 3 3 J JU320 co WP TS II 13 lOX 17 A1 U339 6 rLT TRO 33 U308 29 DBO USO MC3487 28 DB U5I RQ6 l 2...

Page 304: ...r 2 1510E1 5 34 30 U308 5 RlDI fJ RP301 22K RP30 12 Z U306 U OZ p5 Z ZK 11 f I RP301 5 RP301 U301 5 U 02 I V T J I Z 3 I 1U306 1 J304 92 4 SEPD coo Z SCLK COl RP301 3 RCLK DS I E U314 15 ICO ICI E Ie...

Page 305: ...OD D3 A A13 Y I A A 12 oq All D5 A r D6 A J A Ai LU327 D7 AS 2 A7 c P MAO 1 NC RA3 23 AIL AO ADDRESS BUS NC d RA A A7 2 NC MAI3 A 3 7 V MA 2 25 A V MA 3 2 A4 11 A O F A4 12 27_ SO f 3 S LL I 28 A 2i...

Page 306: ...02 13 402 02 01 GA4 04 16 II A5 i z 02 04 02 04 GAS 03 4 A6 o 17 705 OS 03 D Q4 12 3 A7 06 16 06 GAO 13 OS Q 0 2 AS 0719 07 GA I B 07 JZ 06 QS 6 CP OE IR 0 24 A9 D7 Q7 19 21 AlO I p l CE I A VLQ U335...

Page 307: ...OOTS 3 2Y 10 2B IDOlS 3Y 12 L J 3 DB5 l SEL Gr L 4Df r V t o 3A 1Y 7 17 3 DO 3 S U341 5 DY 4 l l 2 zvtL 51 11 20 1 3 f 3Y 1 SELL Gp L U325 40C5H3 1 E B I 2 LPIN LICHT CONNECT 340 JJ01 1 3 4 ________ t...

Page 308: ...8 P303 RP305 t o B A Figure 5 5 181 5312 Schematic 4 of 4 7 8 P308 RGB VIDEO CONNECTOR sv _ _ _ __ Q301 ICOLOR VIDEO FLOPPY I 810 13 S I I04 c...

Page 309: ...SERVICE MODULE Shugart Drive Z 207 7 2 jNI N data systems...

Page 310: ...ERVICE DATE CHANGE D PURPOSE OF SERVICE INITIALS BULLETIN OF PAGE S BULLETIN NUMBER ISSUE Ii 1 1 LIMITED RIGHTS LEGEND Contractor is Zenith Data Systems Corporation of St Joseph Michigan 49085 The ent...

Page 311: ...roduction Parts Supplied 1 1 Chapter 2 Configuration Introduction 2 1 Single Disk Drive Configuration 2 1 Dual Disk Drive Configuration 2 2 Drive A 2 2 Drive B 2 2 Multiple Disk Drive Configuration 2...

Page 312: ...ded for testing and alignment purposes only DO NOT attempt repair or order parts from the Shugart Service Manual Parts Supplied The following parts are supplied with the Z 207 7 Various manuals A 5 ha...

Page 313: ...isk drives For access to the disk drive s refer to disassem bly procedures in the appropriate service manual or the Z 100 PC Base Units Service Modules Single Disk Drive Configuration Refer to Figure...

Page 314: ...o Figure 2 1 Configure drive A by installing the jumper referred to in Inset 2 at location 1 Remove and discard resistor pack referred to in Inset 2 DO NOT move jumpers located at pin DC Configure dri...

Page 315: ...Page 2 3 Configuration GASKET INSET 2 RESISTOR JUMPER PACK SOCKET Figure 2 1 hown for the Z 150 Configuration S...

Page 316: ...Chapter 3 Shugart Service Manual This manual is reprinted with the permission of Shugart Corporation 475 Oakmead Pkwy Sunnyvale California 94086...

Page 318: ...election 1 5 1 4 3 Motor On 1 5 1 4 4 Track Accessing 1 5 1 4 5 Step Out 1 5 1 4 6 Step In 1 5 1 4 7 Side Selection 1 5 1 4 8 Read Operation 1 7 1 4 9 Write Operation 1 8 1 4 10 Sequence of Events 1 8...

Page 319: ...5 3 5 4 Adjustments 5 8 5 4 1 Head Radial Alignment 5 8 5 4 2 Read Write Head s Azimuth Check 5 9 IIII 5 4 3 Head Amplitude Check 5 10 5 4 4 Track Zero Detector Assembly Adjustment 5 11 5 4 5 Index S...

Page 320: ...Sector Timing SA157 167 Media 2 5 Interface Connectors Physical Locations 3 1 J1 Connector Dimensions 3 2 J2 Connector 3 2 Byte 4 1 Basic Read Write Head 4 2 Recorded Bit 4 2 Reading A Bit 4 2 IF and...

Page 321: ...LIST OF TABLES Table Page 2 1 DC Power Requirements 2 6 7 1 Figure Reference To Part Number Cross Reference 7 10 7 2 SA455 465 Spare Parts Stocking Guide 7 11 111 iv...

Page 322: ...rinted Circuit Board Preventive Maintenance Power On Hours Product Selection Index Test Point Tracks Per Inch Track WGOFF Write Gate Off IF Single Density 2F Double Density ABOUT THIS MANUAL While eve...

Page 323: ...I l II 39238 01 A FIGURE 1 1 SA455 465 DOUBLE SIDED MINIFLOPPyTM DRIVE 1111 1 0...

Page 324: ...errite ceramic read write head as usp d in Shugart s large floppy drives internal write protect circuitry activity light and solid die cast chassis Typical applications for the SA455 465 are word proc...

Page 325: ...2 125 kbits sec 250 kbits sec 125 kbits sec 250 kbits sec 100 ms 100 ms 100 ms 100 ms 6 ms 6 ms 3 ms 3 ms 93 ms 93 ms 94 ms 94 ms 15 ms 15 ms 15 ms 15 ms 500 ms 500 ms 500 ms 500 ms 300 rpm 300 rpm 30...

Page 326: ...es the spindle at 300 rpm through a direct drive system An expandable collet spindle assembly provides precision media positioning to en sure data interchange 1 3 3 Positioning Mechanics The read writ...

Page 327: ...OGIC STEPPER A INDEX SECTOR STEPPER B STEPPER MOTOR ON MOTOR STEPPER C SIDE SELECT STEPPER 0 READY TRACK 00 COM TRACK 00 SWITCH TRACK 00 N C II II INDEx SECTOR DRIVE SIDE DETECTOR SELECT SELECT WRITE...

Page 328: ...e read write heads from one track to another is accomplished by a Activating the DRIVE SELECT line b Selecting desired direction using the DIRECTION SELECT line c WRITE GATE being inactive d Pulsing t...

Page 329: ...SA465 39239 27 FIGURE 1 3 STEP TO READ DRIVE SELECT 1 4 50 0 n S M AX VALID WRITE PROTECT _____ I_ r 2 1 5 MAX 2001 s MIN j j VALID READ DATA I I ______ 500 ns MAX r 1 1 ms MAX WRITE GATE I 1 5 ms MIN...

Page 330: ...g the DRIVE SELECT line b Selecting the head c WRITE GATE being inactive The timing relationships required to initiate a read sequence are shown in figure 1 5 These timing specifications are required...

Page 331: ...ion Writing data to the SA455 465 is accomplished by a Activating the DRIVE SELECT line b Selecting the head c Activating the WRITE GATE line d Pulsing the WRITE DATA line with the data to be written...

Page 332: ...5 MIN j 400 5 j a oo 5 40 n5 J 2100 n5 MAX 20 n5 39238 12 FIGURE 1 8 WRITE DATA TIMING FM POWER ON oom MOTOR ON DRIVE SELECT 1 1 5 MIN DIRECTION ______x 9 MINI STEP y 11I S MIN 39238 Q8 C FIGURE 1 9 P...

Page 333: ...EM DRIVE J SPARE SIGNAL LINE 2 SPARE SIGNAL LINE 4 3 DRIVE SELECT 4 6 5 INDEXISECTOR 8 7 DRIVE SELECT 1 10 9 DRIVE SELECT 2 2 l DRIVE SELECT 3 14 13 MOTOR ON 16 15 DIRECTION SELECT 19 17 STEP 20 19 WR...

Page 334: ...fect all the drives in a daisy chain system The input signals to be multiplexed are a DIRECTION SELECT b STEP c WRITE DATA d WRITE GATE e SIDE SELECT The input signals which are intended to do the mul...

Page 335: ...owed before reading or writing This line should be deac tivated for maximum motor life if no commands have been issued to the drives within 2 seconds 10 revolutions of the media after completion of a...

Page 336: ...ng a data bit This line is enabled by WRITE GATE being active Write data must be inactive during a read operation A write data damp is provided on the PCB at the interface which holds the WRITE OATA l...

Page 337: ...the physical beginning of a track See figure 2 5 for the timing s U U 5 1 200 4 ms 39238 13 A 1 FIGURE 2 5 INDEX TIMING SA154 164 MEDIA When using SA155 165 or SA157 167 media hard sectored there wil...

Page 338: ...ulses are 200 ms apart READY becomes active 2 3 POWER INTERFACE The SA455 465 requires only dc power for operation DC power to the drive is provided via P2 J2 The two dc voltages their specifications...

Page 339: ...NS 3 1 1 JI PI Connector Connection to Jl is through a 34 pin PCB edge connector The dimensions for this connector are shown in figure 3 2 The pins are numbered 1 through 34 with the even numbered pin...

Page 340: ...NNECTOR 3 2 FRAME GROUNDING CAUTION The SA455 465 must be frame grounded to the host system to ensure proper opera tion If the frame of the drive is not fastened directly to the frame of the host syst...

Page 341: ...od b The read write head in general is a ring with a gap and a coil wound at some point on the ring c During a write operation a bit is recorded when the flux direction in the ring is reversed by rapi...

Page 342: ...at the portion of the diskette surface that just passed under the gap is magnetized one direction while the portion under the gap is magnetzied in the opposite direction This flux reversal represents...

Page 343: ...I I 39211 22 I I FIGURE 4 6 READ WRITE HEADS During a write operation the erase coil is energized This causes the outer edges of the track to be trim erased so that the track being recorded will not e...

Page 344: ...river circuits which in turn causes the center tap switch to close and erase current to flow after the turn on delay of 400 sec The output of one of the write drivers allows write current to flow thro...

Page 345: ...imit and digitize the read signals sine waves The drive has no data separator only a pulse standardizer for the READ DATA signal ERASE 1 ____________ ERASEO 12V j I SIDE 1 I I READ DATA L ___ SELECT 1...

Page 346: ...tor Four Phase b Stepper Control Logic c Reverse Seek d Forward Seek Seeking the read write head from one track to another is accomplished by selecting the desired direction utilizing the DIRECTION SE...

Page 347: ...drive system It can be easily modified to operate with other drives in a daisy chained multiplexed drive system This is done by selecting the specific drive address and jumpering the appropriate DRIVE...

Page 348: ...LECT e ID FIGURE 4 13 WRITE PROTECT 4 12 READY This interface signal gives the user an indication that a diskette is inserted correctly in the drive and the door is clos ed The READY signal is active...

Page 349: ...KOO d Azimuth Angle not field adjustable TRK 33 TRK64 e 125 k Hz Signal Recorded to Check TRK 34 TRK 79 Head Position on Inside Track Caution should be used not to destroy prerecorded alignment tracks...

Page 350: ...nds c Small defects in written data and or track not detected during write operation may cause soft er rors during read d Improper grounding of power supply drive and or host system Refer to SA455 465...

Page 351: ...her seek to the original track or do a read ID to find on which track the head is located 5 3 TROUBLE SHOOTING Figures 5 1 through 5 5 provide trouble shooting procedures for the SA455 465 START INSER...

Page 352: ...MPER CHECK NO YES DC POWER END OPTIONS AND IF SOURCE DRIVE IS SELECTED REPLACE DRIVE MOTOR REPLACE DRIVE PCB PERFORM MOTOR SPEED ADJUSTMENT PARA 5 4 7 END 392 FIGURE 5 2 DISKETIE NOT ROTATING 5 4 1 ll...

Page 353: ...VE ASSEMBLY TP7 ZERO PCB PARA 5 5 9 YES STEP TO TRACK 01 CHECK LOGIC LEVEL AT TP7 STEP TO TRACK 00 CHECK LOGIC LEVEL AT TP7 RETURN CARRIAGE TO ITS REST POSITION AT TRACK 00 YES NO NO NO PERFORM TRACK...

Page 354: ...K YES DRIVE SELECT JUMPER II I END CHECK JUMPER OPTIONS CHECK 110 CABLE OR CONTROLLER NO NO NO NO NO CHECK POWER SOURCE END INSTALL JUMPER INSTALL JUMPERS YES END REPLACE END DRIVE PCB 39239 07 III II...

Page 355: ...SEE IF DISKETEE IS PROPERLY INSTALLED YES TURN DISKETTE OVER REINSERT CHECK YES DISKETTE ROTATION NO YES REPLACE INDEX SECTOR PHOTOTRANSISTOR14_N _ ASSEMBLY PARA 5 5 6 PERFORM INDEX SECTOR ADJUSTMENT...

Page 356: ...nd probes to PCB Set inputs to ac ADD and invert one channel Set vertical deflection to 50 mV division e Amplitude of two lobes must be within 70 of each other 80 for 465 If lobes do not fall within s...

Page 357: ...muth Check The azimuth is not field adjustable If after performing this check the waveform on the oscilloscope is not within 21 minutes replace the read write head s assembly a Install alignment diske...

Page 358: ...d time base to 20 msec per division e Select head 0 and write a 2F pattern on entire track should be 100 mV Average minimum amplitude peak to peak f Select head 1 and write a 2F pattern on entire trac...

Page 359: ...ctor and verify presence of 125 k Hz signal Repeat stepping until signal is found h Once 125 k Hz signal is present on oscilloscope carriage is located at track 00 Disconnect pro bes from TPI TP2 and...

Page 360: ...data pulse This should be 200 200 100 p sec If timing is not within tolerance continue on with adjustment See figure 5 10 g Loosen mounting screw in index detector block until assembly is just able t...

Page 361: ...motor PCB for 5 0 05 Hz Period 200 2 ms 5 4 7 Write Protect Detector a Insert diskette into drive Write protect notch must be open b Set oscilloscope to AUTO SWEEP 2 V div Monitor TP9 c Check to see...

Page 362: ...I9 Q R21 H i CI CA2 CI6 4 _ R3 I OOlPC _ _ 1 CX CX d o rrn R33 _ gs Q C2 1 if C22 L f J R4 fJ OCZJ R Q RAJ 421 T 1 _ Cl3 if 7 S n 9 C A 6 0 Iii I I I 39239 18 FIGURE 5 12 PCB COMPONENT LOCATIONS PIN S...

Page 363: ...b clamp with spacer and spring in place onto spindle hub Large end of spring is placed against hub frame e Press hub frame down towards spindle until hub shaft protrudes through mounting hole in hub f...

Page 364: ...dresses of 00 and 39 SA455 or 79 SA465 into exerciser g Select drive h Start motor and let drive seek automatically for 5 minutes L Check that activity light is on j Using this SA455 465 Service Manua...

Page 365: ...SECTION VI SCHEMATIC DIAGRAMS The following schematic diagram is furnished as an aid to malfunction analysis of PCB s 25284 SA455 and 25286 SA465...

Page 366: ...I 12 v 38 4 J s 2A TP7 8r I MOTOR f D 1 D 12 ON HClIO 4 53 CD LOll0 L V ppe z 1 R 3 W v t1K RlD 7K I 5V _2 l 7 TR v I DCI 2 __________ _______f_5_0____ 7 __ __ ____ ____________ ____ _4 J __ _ SV f 1...

Page 367: ...USEO NOT USED V R J o lil MDI 5V I I L if C D2 25 21 3 R57 R23 R24 R27 I u r5 ID2 LI U51 n _ o t IO 5 5MDZ v 7K folD CMO 2Z C26 5V I MOR v t 1f7 G 5t 1D oJ V CRG GR3 CR4 I 59 iO 3 IRQ Silo f 2 3 le 7...

Page 368: ...e LSf RI4 wRITE 2 4 0 2 1 1 2 t a Tr Ie r I l148Y f c vr 2 1 Gil 5VP J flI I 48 II 12 8 I _z i7 1 5 4 R26 B H 150 r 5V 0 5 a 5 J5 5 051 98 ft19 Y z 12 11 Me RIO 58 z l58 Fe co Y I 2 38 lee 5V 38 MC 2...

Page 369: ...ENCE DESIGNATION 99 10 24 7r lDHLD SMO j g 5V _ fuJ A rn SMDI L ST U 5E O NOT U5ED MOl v i7I I MD2 SMD2 25 21 I 1O 75 5MD2 R57 R41 R42 R2 R24 R27 v HI 47 I MO 22 C 2 Gte elQ G21 VV SV MOR SMD3 t n SMD...

Page 370: ...e of impor tance only to those customers with alternate assemblies Following the descriptions of these parts the designation NHA PIN gives the part number of the assembly to which they pertain When ap...

Page 371: ...2 Q O _______ 0 L 39239 1511 I FIGURE 7 1 SA4551465 BASIC DRIVE ASSEM BLY SHEET 1 OF 4 7 2 I II III r 1 1 111 lj I i1 illAl 11111 II 11111 11 1 1 I 1 lfl II I I I II d...

Page 372: ...SA455 465 BASIC DRIVE ASSEMBLY REFERENCE PART NUMBER NUMBER DESCRIPTION QTY Ref 51756 SA455 465 MINIFLOPPyTM DRIVE 1 25284 SA455 PCB 1 25286 SA465 PCB 1 2 11477 SCREW 2 7 3...

Page 373: ...II I FIGURE 7 1 SA455 465 BASIC DRIVE ASSEMBLY SHEET 2 OF 4 7 4 I III 1 1 II I...

Page 374: ...ER NUMBER DESCRIPTION QTY 3 11464 SCREW 1 4 51782 CLAMP HANDLE 1 5 52446 FACE PLATE 1 6 54758 WRITE PROTECT INDEX DETECTOR 1 7 11475 SCREW 2 8 51896 GUIDE SHAFT ASSEMBLY 1 9 11450 SCREW 2 10 51898 CLA...

Page 375: ...15 16 I 39239 1513 FIGURE 7 1 SA455 465 BASIC DRIVE ASSEMBLY SHEET 3 OF 4 7 6 III II...

Page 376: ...13 14 15 16 17 18 19 SA455 465 BASIC DRIVE ASSEMBLY CONT PART NUMBER 11461 51785 51784 51786 54768 11468 54762 DESCRIPTION E RING LIFT SHAFT LIFT SPRING LIFTER SHIELD PLATE SCREW TRACK 00 SENSOR QTY 2...

Page 377: ...18 39239 1514 FIGUR 7 1 SA455 465 BASIC DRIVE ASSEMBLY SHEET 4 OF 4 7 8 I ll 1 II I Iii I I I I...

Page 378: ...NUMBER DESCRIPTION QTY 20 51754 STEPPER ASSEMBLY 1 21 54773 SA455 HEAD CARRIAGE ASSEMBLY 1 54814 SA465 HEAD CARRIAGE ASSEMBLY 1 22 11476 SCREW 2 23 51895 CLAMP Guide Rod 2 24 51801 GUIDE ROD 2 25 1145...

Page 379: ...18 11456 1 32 51788 1 14 11461 1 23 51800 1 34 11464 1 3 51801 1 30 11468 1 18 51895 1 23 11475 1 7 51896 1 8 11476 1 22 51898 1 13 11477 1 2 52446 1 5 25284 1 1 54758 1 6 25284 1 2 54762 1 22 51754...

Page 380: ...7 2 shows the spare parts required to support the SA455 465 in the field TABLE 7 2 SA455 465 SPARE PARTS STOCKING GUIDE PART NUMBER DESCRIPTION 25284 PCB SA455 25286 PCB SA465 51781 LOCK CAM 51782 CL...

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