Tandy 6000 HD Service Manual Download Page 144

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Service Manual

TANDY 6000/6000-HD

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Parts Lists, I/O Processor PCB, 8898423(11/17/82)

Ref.No.

Description

Part No.

C46

Capacitor,

0.1 uF,

50V

8374104

C47

Capacitor,

0.1 uF,

50V

8374104

C48

Capacitor,

0.1 uF,

50V

8374104

C49

Capacitor,

0.1 uF,

50V

8374104

C50

Capacitor,

10 uF,

16V, Elec Rad

8326101

C51

Capacitor,

0.1 uF,

50V

8374104

C52

Capacitor,

0.1 uF,

50V

8374104

C53

Capacitor,

0.1 uF,

50V

8374104

C54

Capacitor,

0.1 uF,

50V

8374104

C55

Not Used

C56

Not Used

C57

Not Used

C58

Not Used

C59

Capacitor,

390 pF,

NPO, C Disk

8301394

C60

Capacitor,

0.68 uF,

35V, Tant.

8334683

C61

Capacitor,

5-60 pF,

NPO, Trim

8360550

C62

Capacitor,

0.1 uF,

50V

8374104

C63

Capacitor,

0.1 uF,

50V

8374104

C64

Capacitor,

0.1 uF,

50V

8374104

C65

Capacitor,

0.1 uF,

50V

8374104

C66

Capacitor,

0.1 uF,

50V

8374104

C67

Capacitor,

0.1 uF,

50V

8374104

C68

Capacitor,

0.1 uF,

50V

8374104

C69

Capacitor,

0.1 uF,

50V

8374104

C70

Capacitor,

0.1 uF,

50V

8374104

C71

Capacitor,

0.1 uF,

50V

8374104

C72

Capacitor,

0.1 uF,

50V

8374104

C73

Capacitor,

0.1 uF,

50V

8374104

C74

Capacitor,

0.1 uF,

50V

8374104

C75

Capacitor,

0.1 uF,

50V

8374104

C76

Capacitor,

0.1 uF,

50V

8374104

C77

Capacitor,

0.1 uF,

50V

8374104

C78

Capacitor,

0.1 uF,

50V

8374104

C79

Capacitor,

0.1 uF,

50V

8374104

C80

Capacitor,

0.1 uF,

50V

8374104

C81

Capacitor,

0.1 uF,

50V

8374104

C82

Capacitor,

0.1 uF,

50V

8374104

C83

Capacitor,

0.1 uF,

50V

8374104

C84

Capacitor,

0.1 uF,

50V

8374104

C85

Capacitor,

0.1 uF,

50V

8374104

C86

Capacitor,

0.1 uF,

50V

8374104

C87

Capacitor,

0.1 uF,

50V

8374104

C88

Capacitor,

0.1 uF,

50V

8374104

C89

Capacitor,

0.1 uF,

50V

8374104

C90

Capacitor,

0.1 uF,

50V

8374104

- 145 -

Summary of Contents for 6000 HD

Page 1: ...TANDY ServiceManual TANDY 6000 6000 H D Catalog Number 26 6021 2 CUSTOM MANUFACTURED FOR RADIO SHACK A DIVISION OF TANDY CORPORATION 26 6021 2...

Page 2: ......

Page 3: ...TANDY COMPUTER PRODUCTS SERVICE MANUAL TANDY 6000 6000 HD Catalog Number 26 6021 2...

Page 4: ...express written permission from Tandy Corporation of any portion of this manual is prohibited While reasonable efforts have been taken in the preparation of this manual to assure its accuracy Tandy C...

Page 5: ...Video Keyboard Interface Board 165 7 6 Power Supply Board 193 7 7 Sound B o a r d 209 7 8 CRT Assembly 213 7 9 Keyboard Assembly 215 7 10 Hard Disk Controller 219 8 Exploded Views Parts Lists 243 8 1...

Page 6: ...put Cable 34 5 8 FDC to Internal Drive Cable 36 5 9 Video Keyboard PCB to Keyboard Cable 37 5 10 DC Power Cable 38 5 11 AC Input Cable 39 5 12 Main Logic Board to Sound Board Cable 40 5 13 Video Cable...

Page 7: ...le 255 8 7 Exploded View Case Top Assembly 257 8 8 Exploded View Keyboard Assembly 259 List of Tables Number Description Page No 7 1 Interrupt Inputs 66 7 2 Memory Mapped I O Locations 80 7 3 Memory M...

Page 8: ...TANDY COMPUTER PRODUCTS...

Page 9: ...mbly level It contains detailed instructions on disassembly and assembly of major subassemblies as well as some troubleshooting hints for the PCBs and subassemblies contained in the system It also inc...

Page 10: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 1 1 Major Assemblies TANDY 6000 6000 HD 2...

Page 11: ...ieved The other assemblies of the TANDY 6000 6000 HD are mounted to the Base Assembly The Base Assembly has rubber feet to protect the surface on which the TANDY 6000 6000 HD is placed for operation 1...

Page 12: ...ing air flow to the disk drives for improved performance It contains shielding to protect the floppy disk drive electronics from RF interference by the switching power supply or video display It mount...

Page 13: ...dule The Rear Door Assembly is a removable assembly that allows easy access to the rear compartment and card cage when installed It slides into a groove at the top of the Bezel Cover Assembly and is a...

Page 14: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 6...

Page 15: ...kgm 2 2 System Operating Characteristics Min Typ Max Units Ambient Temperature 55 75 85 Degree F 12 23 30 Degree C Voltage Range USA 95 115 135 VAC Europe 190 230 270 VAC Current Drain 1 5 2 0 A Line...

Page 16: ...double density or 1 megabyte with double sided double density 16 Bit CPU Board Provides 16 bit operation for high level language tasks Hardware allows 8 levels of vectored interrupts 4 levels of fixe...

Page 17: ...handling the Top Cover and Bezel CRT Assemblies to prevent scratching or marring the surface finish 3 1 Top Cover Assembly 1 Remove all power from the unit by disconnecting the power cord Remove perip...

Page 18: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 3 1 Cover Assembly and Bezel Assembly Mounting Screws 10...

Page 19: ...Separate the two units Base and Bezel CRT by disconnecting the attaching harnesses one to the Video Keyboard Interface PCB and an in line connector to the Power Supply Assembly 5 Remove the ground wi...

Page 20: ...e CRT Monitor PCB lower rear mounting screw 3 4 Brightness and Contrast Controls 1 The brightness and contrast controls are accessible after the Bezel CRT Assembly has been removed from the Base Assem...

Page 21: ...he Top Cover Assembly see Paragraph 3 1 2 Remove the power and signal connectors from the rear of the floppy and hard disk unit s 3 Loosen the 2 rear screws and remove the middle screw that mount the...

Page 22: ...embly Video Keyboard Interface PCB Assembly Mother Board 16 bit CPU 16 bit Memory and Power Supply PCB and the instrument cooling fan Interconnection of the I O Processor PCB and other components is a...

Page 23: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 3 2 Electronics Module Assembly 15...

Page 24: ...not be included in all units 12 Unplug P5 from the J8 connector on the RH side of the Mother Board Then remove the screws on the RH side of the Card Cage which mount the Card Cage to the Electronics...

Page 25: ...1 Remove the seven Phillips machine thread screws that attach the I O Processor PCB to the Electronics Module chassis one attaches the ground lug at the front right side of the chassis Note Make sure...

Page 26: ...padded surface to prevent damage to the keypads 2 Remove from the underside of the assembly the seven screws that tie the two halves of the keyboard together 3 Hold the two halves together and turn th...

Page 27: ...the adjustments See Figure 4 1 1 Move the Video Keyboard Interface PCB to the first unused slot below the 16 bit CPU and Memory Boards or completely remove the PCB 2 Turn power ON and engage the manua...

Page 28: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 4 1 Adjustments 20...

Page 29: ...rconnected properly It is not necessary at this time to mechanically reassemble the unit 12 Turn the power ON Re install Video Board if removed in step 1 13 When the screen shows INSERT DISKETTE inser...

Page 30: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 22...

Page 31: ...00 6000 HD System and pin designations of all the connectors of the TANDY 6000 6000 HD The Video Keyboard Interface PCB plugs into the Mother Board The Mother Board plugs into the Main Logic PCB at co...

Page 32: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 24...

Page 33: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 5 2 Cable Wiring Cable Location Floppy Disk Drives Version 1 25...

Page 34: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 5 3 Cable Wiring Cable Location Hard Disk Drives Version 1 27...

Page 35: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 5 4 Cable Wiring Cable Location Floppy Disk Drives Version 2 29...

Page 36: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 5 5 Cable Wiring Cable Location Hard Disk Drives Version 2 31...

Page 37: ...A 6 12 No Connection 19 13 GND Power Ground 7 14 DTRA Data Terminal Ready Channel A 20 15 CDETA Carrier Detect Channel A 8 16 21 No Connection 22 TCLKA Transmit Clock Channel A 24 23 No Connection 12...

Page 38: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 5 6 RS 232 Serial Interface Cable Figure 5 7 Line Printer Parallel Output Cable 34...

Page 39: ...8 GND Power Ground 9 PDAT3 Data Bit 3 to Printer 10 GND Power Ground 11 PDAT4 Data Bit 4 to Printer 12 GND Power Ground 13 PDAT5 Data Bit 5 to Printer 14 GND Power Ground 15 PDAT6 Data Bit 6 to Print...

Page 40: ...SDSELI Side Select low side 0 high side 1 16 No Connection 18 HLDI Head Load 20 IPI Index Pulse 22 READYI Drive Ready 24 No Connection 26 DS0I Drive Select Zero Internal 28 DS1I Drive Select One Inter...

Page 41: ...COMPUTER PRODUCTS Video Keyboard Interface P2 J2 Keyboard Receptacle Pin Name Description Pin 1 DATA Data from Keyboard 1 2 No Connection 3 CLOCK Clock From Keyboard 2 4 BUSY Busy to Keyboard 3 5 Vol...

Page 42: ...rives the CRT Monitor PCB and the Mother Board It also supplies 5 volts at pin 8 to the Keyboard via the keyboard connector on the front panel of the Base Assembly This voltage is fused by a 1 ampere...

Page 43: ...junction in the circuit after the switch also supplies power to the cooling fan mounted on the Rear Connector Panel Fan Support Input wiring is grounded through this cable by a terminal at the Rear Co...

Page 44: ...ssor Board to Sound Board This cable assembly interconnects the I O Processor PCB to the Sound Board located at the left front corner of the Base Assembly The cable is symmetrical and may be connected...

Page 45: ...mbly 6000888 Video The Video Harness contains the wiring that supplies 12 volts to the Video Monitor Assembly wiring to the brightness and contrast controls mounted on the Base Assembly and control ci...

Page 46: ...ess Assembly 6008046 Fan Power The Fan Harness consists of a twisted pair that picks up AC power at the terminal strip on the Power Supply Assembly It is controlled by the ON OFF switch located at the...

Page 47: ...wledge Out out 17 BUSRQ Bus Request in 18 SYNC Z 80 Ml indicates Op Code Fetch out 19 RD Read In Progress out 20 WR Write In Progress out 21 MEMCYC Z 80 MEMRQ Memory Cycle In Progress out 22 IOCYC Z 8...

Page 48: ...utput 56 DAT 5 Data Bit 5 Inverted input output 57 DAT6 Data Bit 6 Inverted input output 58 DAT 7 Data Bit 7 Inverted input output 59 DAT 8 Data Bit 8 Reserved for System Expansion 60 DAT 9 Data Bit 9...

Page 49: ...19 GND Signal Ground 20 BAS Bus Address Strobe 21 BUDS Bus Upper Data Strobe 22 BLDS Bus Lower Data Strobe 23 GND Signal Ground 24 BR W Bus Read Write Signal 25 BDTACK Bus Data Transfer Acknowledge 26...

Page 50: ...nt Level 0 16 BRl Bus Request Level 1 17 BG1 Bus Grant Level 1 18 BR2 Bus Request Level 2 19 BG2 Bus Grant Level 2 20 RES Reserved 21 RES Reserved 22 GND Signal Ground 23 GND Signal Ground 24 IRQ8 Int...

Page 51: ...o the Video Keyboard PCB and the Power Supply Verify there are no disk s inserted in the drive s Verify that the power switch on the underside of the left lip of the Base assembly is OFF then connect...

Page 52: ...characters due to power up 8 Initialize the HARD DISK if available and FLOPPY DISK systems Software reset the controllers seek track 5 then issue restore commands set heads to track 0 Now the system i...

Page 53: ...d the RAM memory This is all that is required to load the operating system using a polled non interrupt method The memory is tested from 2000H up to FFFFH This is to determine if the system memory siz...

Page 54: ...dy HC CRC error data HI CRC error ID HN ID not found HA Aborted command HO Track 0 error HM Data Address mark not found HD Any other error Floppy Disk Errors Other Errors DC FDC or drive error busy no...

Page 55: ...n dated 11 29 1982 Tests SIO serial channels A B PIO printer I F external floppy I F DMA and Z80 interrupts and bus structure Special loopback test cables required 2 MEMII Version 1 3 Video refresh RA...

Page 56: ...1 Meg Memory Board use the following troubleshooting chart for locating the trouble Run Diagnostics Condition Possible Fault Recommended Action 6000 6000HD Mem ory Test uses Z80A to test memory Test...

Page 57: ...ontroller U15 and all hardware interrupt inputs into U15 MC68000 CPU Replace MC68000 Clock logic Check clock circuit Software in terrupt received was not inter rupted generated Interrupt controller Re...

Page 58: ...and strobes Check I O and strobe circuit Mother Board Troubleshooting Run Diagnostics Condition Possible Fault Recommended Action 6000 6000 HD Memory Modi fied Address Test Bad RAM reported Bad RAM Ca...

Page 59: ...connector receptacles are numbered from Jl through J7 beginning at the bottom of the board The power supply input connector P5 plugs into receptacle J8 at the RH side of the board Also included on th...

Page 60: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD Component Location Mother Board 8897701 56...

Page 61: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace Mother Board 8897701 Component Side 57...

Page 62: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace Mother Board 8897701 Solder Side 58...

Page 63: ...519014A J2 Connector 80 pin Card Edge 8519014A J3 Connector 80 pin Card Edge 8519014A J4 Connector 80 pin Card Edge 8519014A J5 Connector 80 pin Card Edge 8519014A J6 Connector 80 pin Card Edge 851901...

Page 64: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 60...

Page 65: ...cate a true or active state regardless of its high or low potential Negate or negation indicates a false or inactive state 7 2 1 Central Processing Unit CPU The TANDY 6000 6000 HD CPU board uses the M...

Page 66: ...in supervisor or user mode If it is in supervisor mode U30 is enabled and KA12 KA19 is enabled to BA12 BA19 If it is in the user mode U30 is disabled and BA12 BA19 is driven by the Memory Management C...

Page 67: ...write Data Transfer Acknowledge DTACK is the asynchronous handshake signal used by memory and peripheral devices to indicate to the MC68000 that a bus cycle has been completed DTACK is connected dire...

Page 68: ...devices The outputs E and VMA are interfaced to the 16 bit bus with a buffer U14 Ul4 s enables are controlled by the BGACK signal If BGACK is active the buffer is disabled and the outputs are tri sta...

Page 69: ...eived during an interrupt acknowledge sequence See Paragraph 7 2 10 Bus Error Logic for more information 7 2 2 Interrupt Logic The Interrupt Control function for the MC68000 subsystem is implemented w...

Page 70: ...lly poll an MC68000 memory location to recognize requests for service from the MC68000 Optionally the MC68000 can generate an interrupt to the Z80A by accessing a decoded MC68000 memory location not a...

Page 71: ...ated when no DTACK is received and the MC68000 is not the bus master 248H IPER Parity error generated on a memory parity error when the MD68000 is the bus master 24CH EPER Parity error generated on a...

Page 72: ...les and text below Upper Address Latch port ODFH Description Output only latches the upper address bits A22 A15 for a Z80A transfer to or from MC68000 memory Data Bit Function 7 A22 6 A21 5 A20 4 Al9...

Page 73: ...sable refresh to the MD68000 memory boards To observe the refresh requirement of the MC68000 memory RESET should not be asserted longer than 15 microseconds When using the DMA to tranfer data the DMA...

Page 74: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ F i g u r e 7 1 Read and Write Cycle Timing 70...

Page 75: ...Service Manual _ __ TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Figu re 7 2 Write Cycle Timing 71...

Page 76: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTERPRODUCTS _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Figure 7 3 Read Cycle Timing...

Page 77: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD Figure 7 4 Refresh Cycle Timing of 68000 73...

Page 78: ...nts and relocation is done on 4K byte boundaries Memory management is not active in system mode or during memory transfers initiated by bus masters other than the MC68000 CPU 74 BURST 0 Byte Mode enab...

Page 79: ...to the address bus The effective address is compared to the 8 bit value that is stored in the active limit register If the effective address is larger than the contents of the active limit register o...

Page 80: ...eing bus master to request be granted and acknowledge bus mastership The bus arbitration sequence is as follows 1 The device asserts a Bus Request BR 2 The MC68000 CPU asserts a Bus Grant BG to indica...

Page 81: ...vice with the highest priority The bus arbitration controller U6 will also assert BGACK and negate BR to the MC68000 CPU BGACK is inverted by l 6th of U2 and both signals are used to indicate to other...

Page 82: ...to the MC68000 CPU and the bus cycle is terminated Assertion of BDTACK during a write cycle causes the MC68000 CPU to terminate the bus cycle after approximately one and one half PCLOCK cycles There a...

Page 83: ...Onboard BDTACK Generation Generation of BDTACK from offboard devices is only from the MC68000 memory boards BDTACK being asserted from an MC68000 memory board indicates that the data transfer has been...

Page 84: ...coded by a 3 input AND gate 1 3 of UlO that generates the signal VMIIAD VMIIAD and mIO KA19 are connected to the I O controller and generate the I O signals during access to the memory space 780000H t...

Page 85: ...data register 7800D1 Interrupt controller command register 7800D2 Limit register two 7800D3 Offset register two 7800D4 Limit register one 780OD5 Offset register one 7800D6 Interrupt request to Z80A 7...

Page 86: ...again This generates a divide by 2 at U46 pin 14 24 MHz a divide by 4 at pin 13 non symmetrical 12 MHz a divide by 6 at pin 12 8MHz and a divide by 12 at pin 11 4MHz The 24 MHz output is divided by 2...

Page 87: ...h state machine implemented with a PAL device U46 Figure 7 8 shows the timing relationships of the refresh logic The double refresh 31psec mode does not work with 512K lMeg memory board 7 2 10 Bus Err...

Page 88: ...s and Equations PAL 16R4 U48 Pin Assignments 8MHZ 2 SRW KA19 5 6 VM2AD AS RESET GND E 12 IORQ WR B C D RD DTACK VCC Equations IF VCC DTACK B C D A S VM2AD KA19 RESET IF VCC RD AS VM2AD KA19 SRW RESET...

Page 89: ...FG BR VCC Equations IF VCC BR RESET REFQ BGACK RESET BRO BGACK RESET BRl BGACK RESET BR2 BGACK BGACK RESET BG DTACK AS REFRQ RESET BG DTACK AS BRO RESET BG DTACK AS BRl RESET BG DTACK AS BR2 RESET BGA...

Page 90: ...ZAO BGEN MEMSEL ZRD ZAO AS UDS 4MHZ LDS BGEN MEMSEL ZRD ZAO BGEN MEMSEL ZRD ZAO AS LDS 4MHZ RW BGEN MEMSEL ZRD WAIT RW MEMSEL RW 4MHZ IF ADDVAL MEMSEL WAIT BGEN ADDVAL MEMSEL BGl ADDVAL MEMSEL DTACK...

Page 91: ...RSH REFGL IF VCC XI RESET X2 X0 MODE REFRSH REFGL RESET Xl X0 MODE REFRSH REFGL RESET X2 XI MODE REFRSH REFGL IF VCC XO RESET X2 X1 MODE REFRSH REFGL RESET Xl XO REFRSH REFGL RESET X2 XO MODE REFRSH R...

Page 92: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Component Layout MC68000 CPU Board 8709573 88...

Page 93: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace MC68000 CPU Board 8709573 Component Side...

Page 94: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace MC68000 CPU Board 8709573 Layer 2 90...

Page 95: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace MC68000 CPU Board 8709573 Layer 3 91...

Page 96: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace MC68000 CPU Board 8709573 Solder Side 92...

Page 97: ...Elect Rad 8327101 C56 57 Capacitor 68 pF 50V C Disk 8300683 C59 Capacitor 68 pF 50V C Disk 8300683 C60 Capacitor 0 001 uF Ceramic 10 Z5P 8302104 C61 Capacitor 27 pF 50V C Disk 5 8300273 C64 Capacitor...

Page 98: ...Array 20 Pin 8040166 U7 IC 74LS174 Hex D Type Flip FLop 16 Pin 8020174 U8 IC 74S00 Quad 2 IN NAND 14 Pin 8010000 U9 IC 74LS02 Hex Inverter 14 Pin 8020002 U10 IC 74LS11 Triple 3 IN AND 14 Pin 8020011 U...

Page 99: ...042168 U41 IC 74LS138 Decoder Mux 16 Pin 8020138 U42 IC 74S00 Quad 2 IN NAND 14 Pin 8010000 U44 IC 74S244 Octal Buffer 20 Pin 8010244 U 45 IC 82S153 20 Pin 8040153 U46 IC 74F161 Counter 16 Pin 8015161...

Page 100: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 96...

Page 101: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Schematic MC68000 CPU Board 8000247 Page 1 or 3 97...

Page 102: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Schematic MC68000 CPU Board 8000247 Page 2 or 3 99...

Page 103: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS _ _ Schematic MC68000 CPU Board 8000247 Page 3 or 3 101...

Page 104: ...checked on all transfers if the option is enabled the parity generating checking has to be set up on a byte basis Therefore each byte has a ninth bit added called a parity bit Parity is a scheme where...

Page 105: ...ding on the state of the Read Write R W signal Refresh is required to maintain the information stored in the RAMs Every 2 milliseconds the entire contents of the RAM must be refreshed This requires 12...

Page 106: ...ting of Si and jumper options E1 E9 7 3 3 Control Timing The control and timing signals consist of Bus Address Strobe BAS Bus Upper Data Strobe BUDS Bus Lower Data Strobe BLDS Bus Read Write BR W Memo...

Page 107: ...without CAS becomes a refresh cycle REFRESH signal will cause all present memory boards to issue a refresh cycle REFRESH REFRESH will first disable address multiplexers U48 U29 and U15 and then enable...

Page 108: ...0 2FFFFF X 1 1 X 1 0 0 1 300000 33FFFF X 1 0 X 0 0 1 1 340000 37FFFF X 1 1 X 0 0 1 1 380000 3BFFFF X 1 0 X 1 0 1 1 3C0000 3FFFFF X 1 1 X 1 0 1 1 400000 43FFFF X 1 0 X 0 1 0 0 440000 47FFFF X 1 1 X 0 1...

Page 109: ...X X 1 1 0 0 500000 57 FFFF X 1 X X 0 1 1 0 580000 5FFFFF X 1 X X 1 1 1 0 600000 67 FFFF X 1 X X 0 1 0 1 680000 6FFFFF X 1 X X 1 1 0 1 512K Board Jumpers E1 E2 64K E5 E6 256K E7 E8 256K 512K Memory Ma...

Page 110: ...ritten into the same memory location as the ninth or parity bit When a byte is being read from a memory location all nine bits are monitored by the output parity checkers the parity bit is not passed...

Page 111: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 110...

Page 112: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Component Layout 512K Memory Board Ill...

Page 113: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace 512K Memory Board Component Side 112...

Page 114: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace 512K Memory Board Solder Side 113...

Page 115: ...74104 C41 48 Capacitor 0 1 uF 50V Mono Axial 8374104 C49 Capacitor 100 uF 10V Elect Ax 8317100 C50 58 Capacitor 0 1 uF 50V Mono Axial 8374104 C61 68 Capacitor 0 1 uF 50V Mono Axial 8374104 Capacitor 1...

Page 116: ...ultiplexer 16 Pin 8015157 U16 IC 74F00 Quad 2 IN NAND 14 Pin 8015000 U17 IC 74F04 Hex Inverter 14 Pin 8015004 U18 IC 74F00 Quad 2 IN NAND 14 Pin 8015000 U23 IC 74F00 Quad 2 IN NAND 14 Pin 8015000 U24...

Page 117: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 116...

Page 118: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Schematic Memory Board 8000229 Page 1 of 2 117...

Page 119: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Schematic Memory Board 8000229 Page 2 of 2 119...

Page 120: ...M 2K of ROM and the necessary timing control circuity The PERIPHERAL section consists of a Z80A CTC SIO serial PIO printer a FLOPPY DISK CONTROLLER and a sound circuit interface 7 4 1 CPU Section 1 Pr...

Page 121: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 7 9 I O Processor PCB Block Diagram 122...

Page 122: ...or on off through the resistor network R19 R20 C6 WAIT schematic sheet 1 consists of two parts a fixed wait circuit and an user wait circuit The fixed wait circuit U3 generates a wait request signal u...

Page 123: ...odes the address and control signals to create the CPU section port read write strobes MEMCFG SYSCFG OPSCFG and F8 plus the logic discretes F8I0 and DMARD The decoder is UlO a custom logic array See T...

Page 124: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Table 7 5 Input Output Port Map 125...

Page 125: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Table 7 5 Input Output Port Map con t 126...

Page 126: ...NTRQ from the BOARD and external INTRQ from the bus The priority schemehas the four Z80A functions on the board assigned the highest priority with a descending priority of CTC SIO DMA and PIO The bus...

Page 127: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Table 7 6 Memory Map 128...

Page 128: ...2K This memory is available only if the discrete signal ROM from the port F9 is true When the BOOT ROM is enabled the shadowed RAM memory is write only read disabled An option to upgrade to a 4K x 8...

Page 129: ...ODE E30 E3I E3I E49 TEST NORMAL E 40 4I INTERNAL FLOPPY DRIVE OPTION E40 E41 OPEN 1 INTERNAL DRIVE 0 2 INTERNAL DRIVES 0 l E42 E43 E443 E45 E46 E47 E4B RAM U63 U70 CONFIGURATION OPTION FOR I6K PIN 4HG...

Page 130: ...B BAUD CLOCK E7 EB E 6 E 7 INTERNAL CTC CLOCK SOURCE EXTERNAL CLOCK SOURCE E9 EIO EH E Z OPTIONS FOR SERIAL CHANNEL A BAUD CLOCK ElO EH E1I EI2 INTERNAL CTC CLOCK SOURCE EXTERNAL CLOCK SOURCE E9 EI0...

Page 131: ...UCTS 50 E5I 52 RAM UPPER BANK SIZE OPTION E50 E52 E5I E52 6 4 K S IZ E I6K SIZE 53 E54 E55 OPTIONS FOR SERIAL CHANNEL A RECEIVE BAUD CLOCK E53 E54 E53 E55 INTERNAL CTC CLOCK SOURCE EXTERNAL CLOCK SOUR...

Page 132: ...nd U81 The equation for U39 is MREQ WRITE MREQ ROM ROMAD READ MREQ RAM READ Basically this allows write access to the RAM memory for all addresses but limits the read accesses to only those addresses...

Page 133: ...used as a baud rate generator for the SIO function Here channel 0 and 2 are tied together to provide a square wave clock for both channels of the SIO serial interface Second it is an interrupt process...

Page 134: ...ommunicates with the CPU as an I O device Interface circuity is provided to interface with two sets of FDDs 1 or 2 internal drives in chassis and 1 or 2 external expansion drives Since the FDDs in a s...

Page 135: ...et 4 for the control circuit 6 I O CONTROL The I O CONTROL circuit for the Peripheral section is U21 a programmable logic array See Table 7 5 for address and function of the I O ports CTCCE SIOCE PIOC...

Page 136: ...RQ WRITE SYSMCFG CA7 CA6 CA5 CA4 CA3 CA2 CA1 CAO IORQ WRITE F9 IORQ WRITE F8 CA7 CA6 CA5 CA4 CA3 CA2 CAl CAO IORQ DMA CHIP SELECT DMARD F8I0 READ DISABLE TRANSCEIVER DURING DMA I O READ OPSCFG CA7 CA6...

Page 137: ...ERFACE CHIP SELECT PORT E0 E3 IF VCC FDCCE PA7 PA6 PA5 PA4 PA3 PA2 PIORQ FLOPPY DISK CNTLR CHIP SELECT PORT E4 E7 IF VCC SOFTMR PA7 PA6 PA5 PA4 PA3 PA2 PAl PA0 PIORQ PWRITE FDC SOFTWARE RESET E8 IORQ...

Page 138: ...T DRIVE 3 IF VCC MOTOR DSO DSl DS2 DS3 TURN ON DRIVE MOTOR IF VCC INTERNAL 2DRVIN DS0 2DRVIN DSl 2DRVIN DS0 SELECT EXTERNAL DRIVE SIDESEL PD6 DISK SIDE SELECT DDENP PD7 DOUBLE DENSITY RECORDING 82S153...

Page 139: ...BANKO PAGE Address Range 32 64K RASENO RFSH LOWP A15 VIDEO NO VIDEO RFSH LOWP A15 A14 VIDEO F800 RFSH LOWP A15 A13 VIDEO F800 RFSH LOWP A15 A12 VIDEO F800 RFSH LOWP A15 All VIDEO F800 RASENl Controls...

Page 140: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Component Layout I O Processor PCB 8898423 141...

Page 141: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 142...

Page 142: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace I O Processor PCB 8898423 Solder Side 143...

Page 143: ...4104 C17 Not Used C18 Not Used Cl 9 Capacitor 0 1 uF 50V 8374104 C20 Not Used C21 Capacitor For future design use C22 Capacitor 0 1 uF 50V 8374104 C23 Capacitor 0 1 uF 50V 8374104 C24 Capacitor 1 uF 1...

Page 144: ...or 0 1 uF 50V 8374104 C65 Capacitor 0 1 uF 50V 8374104 C66 Capacitor 0 1 uF 50V 8374104 C67 Capacitor 0 1 uF 50V 8374104 C68 Capacitor 0 1 uF 50V 8374104 C69 Capacitor 0 1 uF 50V 8374104 C70 Capacitor...

Page 145: ...ood 8519158 J3 Connector 50 Pin Vertical Hood 8519160 J4 Connector 50 Pin Rt Angle 8519164 J5 Connector 6 Pin Power 8519015 J6 Connector 4 Pin Rt Anlge 8519053 J7 Connector 5 Pin Straight 8519161 Diod...

Page 146: ...33 IC Z80A CTC 8047882 U34 IC 74LS04 Hex Inverter 9020004 U35 IC 74ALS244 Octal Buffer 9025244 U36 IC Z80A PIO 8047881 U37 IC 74ALS244 Octal Buffer 9025244 U38 IC 74LS74 Dual Flip Flop 9020074 U39 IC...

Page 147: ...Multiplexer 9020157 U81 IC 74S112 Flip Flop 9010112 U82 IC 64K DRAM 8040655 U83 IC 64K DRAM 8040655 U84 IC 64K DRAM 8040655 U85 IC 64K DRAM 8040655 U86 IC 64K DRAM 8040655 U87 IC 64K DRAM 8040655 U88...

Page 148: ...4W 5 8207022 R35 Resistor 4 7k ohms 1 4W 5 8207247 R36 Resistor 10k ohms 1 4W 5 8207310 R37 Resistor 2 2k ohms 1 4W 5 8207222 R38 Resistor 2 2k ohms 1 4W 5 8207222 R39 Resistor 2 2k ohms 1 4W 5 82072...

Page 149: ...9 Staking Pin 8529014 TP10 Staking Pin 8529014 TP21 Staking Pin 8529014 TP22 Staking Pin 8529014 TP23 Staking Pin 8529014 El Staking Pin 8529014 E2 Staking Pin 8529014 E4 Staking Pin 8529014 E5 Stakin...

Page 150: ...Staking Pin 8529014 E49 Staking Pin 8529014 E50 Staking Pin 8529014 E51 Staking Pin 8529014 E52 Staking Pin 8529014 E53 Staking Pin 8529014 E54 Staking Pin 8529014 E55 Staking Pin 8529014 Transistors...

Page 151: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 152...

Page 152: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD 153...

Page 153: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD 155...

Page 154: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 1 5 7...

Page 155: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 159...

Page 156: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 161...

Page 157: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 163...

Page 158: ...keyboard control and enables the video and Real Time Clock Data is latched from the Display RAM into a ROM character generator then shifted to the video output to finally appear on the display monito...

Page 159: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD Figure 7 10 Video Keyboard Interface PCB Block Diagram 166...

Page 160: ...gnal is low active 80 characters per line will be displayed on the screen When the signal is high only 40 characters will appear on the screen CLOCK at pin 6 of U28 test point TP26 is either 12 48 MHz...

Page 161: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD Figure 7 11 Timing Diagram 168...

Page 162: ...required This CRTC commands the interface to raster scan the CRT display It also provides video timing and refresh memory addressing The CRTC is a collection of registers counters and comparators tha...

Page 163: ...D0 D7 using CS RS E and R W for control signals The data bus lines are used for data transfers between the CRTC internal register file and the processor The enable signal pin 23 of Ull is a high impe...

Page 164: ...ayed data The Display Enable is an active high signal that indicates the CRTC is providing addressing in the display area Refresh Memory Character Generator Addressing The CRTC provides memory address...

Page 165: ...oordinates that the display memory and the character ROMreceive from the CRTC memory refresh address and Row address The CRTC takes care of this particular chore while the CPU takes care of other more...

Page 166: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 7 13 Character Dot Pattern 173...

Page 167: ...in our case is 10 rows high so it takes 10 separate accesses of a given character to write its 10 dot rows on the screen Putting 80 x 24 or 1920 characters on the screen requires 10 x 1920 or 19200 c...

Page 168: ...to the multiplexers When this MSP signal is high the Video RAM is under the processor control Note that when the RESET button is pressed U32 pin 8 the CPU loses that control MSP becomes low Since the...

Page 169: ...to give the I O Select IOSEL to enable the 3 state buffers U34 and U35 to either Read from the CRTC I0BIE I 0 Bus Input Enable or Write into it I0BIE l 0 Bus Output Enable Note that test points TP22 U...

Page 170: ...Video display off Bit 5 D5 Set 1 enables the Real Time Clock RTC interrupt Reset 0 disables the RTC interrupts Bit 4 D4 1 enables the 40 character mode and disables the 80 character mode 0 enables th...

Page 171: ...ort FF Therefore the FFWR signal is activated If for example we set bit 7 to 1 bit 6 to 0 bit 5 to 1 and bit 4 to 0 FFWR will latch this data vector into our system and the following results will be o...

Page 172: ...s when data is being clocked in from the keyboard a busy signal is sent to the system bus at the end of everyword 8 bits of data A busy active low signal goes from pin 9 of U17 back to the keyboard pr...

Page 173: ...t is ANDed with ENABLE RTC INT U29 pins 1 and 2 The output of U29 pin 13 is then inverted and sent to the system bus as a Non maskable Interrupt Request NMIRQ Note that this signal is cleared by activ...

Page 174: ...character consists of a pattern of dots there must be some method to determine which dot should be on and which dot should be off to form any one character The character generator controls the dot pa...

Page 175: ...by two TADCLK cycles and Reverse Video REVID is delayed by one TADCLK cycle with respect to the Vout signal This is shown by U12 Note how the delayed cursor and DREVID are exclusive ORed U4 pins 12 an...

Page 176: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Component Layout Video Keyboard PCB 8898022 183...

Page 177: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace Video Keyboard PCB 8898022 Component Side 184...

Page 178: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace Video Keyboard PCB 8898022 Solder Side 185...

Page 179: ...8374104 Cl6 Capacitor 0 1 uF 50V 8374104 C17 Capacitor 0 1 uF 50V 8374104 Cl 8 Capacitor 0 1 uF 50V 8374104 Cl 9 Capacitor 0 1 uF 50V 8374104 C20 Capacitor 0 1 uF 50V 8374104 C21 Capacitor 0 1 uF 50V...

Page 180: ...80 ohm 1 4W 5 8207118 R15 Resistor 2 2k ohm 1 4W 5 8207222 R16 Resistor 2 2k ohm 1 4W 5 8207222 R17 Resistor 2 2k ohm 1 4W 5 8207222 R18 Resistor 4 7k ohm 1 4W 5 8207247 R19 Resistor 8 2k ohm 1 4W 5 8...

Page 181: ...76NDS 9020076 U33 IC SN74LS04NDS 9020004 U34 IC MC8T26APDS 9060026 U35 IC MC8T26APDS 9060026 U36 IC MC8T26APDS 9060026 U37 IC MC8T26APDS 9060026 U38 IC SN74LS240NDS 9020240 U39 IC SN74LS240NDS 9020240...

Page 182: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 189...

Page 183: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 191...

Page 184: ...mmon Pin 11 5 V Pin 4 Common Pin 12 5 V Pin 5 Common Pin 13 24 V Pin 6 Common Pin 14 12 V Pin 7 Common Pin 15 12 V Pin 8 5 V In theory the power supply rectifies the AC line to DC then chops it at 20...

Page 185: ...A step increase in output current from 0 55A initial condition to 3 05A Max decaying to 1 45A total within 350 msec 2 The V03 output may vary 5 under all other conditions of rated line load and temper...

Page 186: ...lass A computing device with a lOdb margin 195 Min Typ Max Hold Up Time Full Load Lo Line 10 18 mSec Full Load Norn Line 16 30 mSec Insulation Resistance Input to Output 100 1000 _ M ohm Trmnt to Grou...

Page 187: ...ges to 200 VAC Recommend two digital multimeters 4 Oscilloscope Need X10 and XI probes 5 Load board with connectors See Table 7 5 for values of loads required The entry on the table for Safe Load Powe...

Page 188: ...x Load J2 Pins 5V V01 i u i 1 o 1 1 1 66 ohm 13 36 34 ohm 8 9 30 W 130 W 11 12 12 V02 25 48 ohm 75 16 ohm 15 6 W 20 W 12 V03 o 1 1 120 ohm 1 5 8 ohm 14 4 W 40 W 24 V04 0 Infinity 2 0 12 ohm 13 100 W 1...

Page 189: ...If there is no output refer to Section 7 3 4 4 Bracket Removal The main PCB is held to the bracket with screws and uses spacers to separate the PCB from the bracket An insulator is inserted between t...

Page 190: ...e collector waveform The transistor should be switching The correct waveform is shown in Figure 7 16 If switching is not present check for shorted junctions on Q7 If Q7 is not shorted check the base w...

Page 191: ...ble 7 10 Voltage and Ripple Specifications Notes 1 V03 must not change from its initial value by more than 100 mV under the following load conditions on the V04 output A step increase in output curren...

Page 192: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Component Layout Power Supply 8790047 201...

Page 193: ...P 055 10267728 C18 Capacitor 0 01 uF 1KV 20 Z5V 055 10368925 Cl 9 Capacitor 470 uF 35V 20 SxA 057 47120230 C20 Capacitor 470 uF 25V 20 SxA 057 47120220 C21 Capacitor 470 uF 25V 20 SxA 057 47120220 C22...

Page 194: ...ode 1N4606 212 10700210 Dll Rectifier 1N4001GP 226 10400080 D12 Rectifier RGP10J 226 10400060 D13 Rectifier RGP10J 226 10400060 D14 Diode 1N4606 212 10700210 D15 Diode 1N4606 212 10700210 D16 Diode 1N...

Page 195: ...5106022 RIO Resistor 100 ohm 5 1 4W 240 10106022 Rll Resistor 470 ohm 5 1 4W 240 47106022 R12 Resistor 470 ohm 5 1 4W 240 47106022 R13 Resistor 220 ohm 5 1 4W 240 22106022 R14 Resistor 27 ohm 5 5W WW...

Page 196: ...sistor 330 ohm 5 2W 248 33106063 R45 Resistor 0 47 ohm 5 1W 247 04786054 R46 Resistor 15K ohm 5 1 4W 240 15306022 R47 Resistor 220 ohm 2 1 4W 247 22005022 R48 Resistor 220K ohm 5 1 4W 240 22406022 R49...

Page 197: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 206...

Page 198: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 207...

Page 199: ...le that has a connector on either end The function of the Sound PCB is to generate an audible signal whenever a key is depressed on the keyboard Contained on this board is an LM555 timer oscillator th...

Page 200: ...50V 8303104 C3 Capacitor 1 mF 16V Elec Axial 8395111 C4 Capacitor 0 1 mF 50V Mono 8374104 C5 Capacitor 10 mF 16V Elec Radial 8326101 J1 Connector 5 pin 8519162 PCB Sound Rev PPl 8709368 Rl Resistor 2K...

Page 201: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Schematic 8000165 Sound Board 8898429 211...

Page 202: ...the Appendix Section at the rear of this manual This information includes a theory of operation of the CRT Assembly schematic diagrams of the various configurations and parts lists Disassembly proced...

Page 203: ...cessor and its associated circuitry scan the key matrix convert switch closures to an 8 bit digital code and then transmits that code serially to the keyboard interface on the Video Keyboard Interface...

Page 204: ...48 21 04148 000 CR5 LED 3401 RD LT 21 03401 001 CR6 LED 3401 RD LT 21 03401 001 Integrated Circuits Z1 IC 74366N 22 74366 001 Z2 IC 90 8 22 00908 003 Z3 IC 950 22 00950 003 Z4 Mup masked 20 88048 269...

Page 205: ...List Low Profile Keyboard 8790522 215 XTAL 3 58 MHz Dip Yl 48 00300 110 Mounting Plate 49 01143 000 Switch 30mm Capacitor Assy 61 04024 001 Switch 30mm Capacitor Assy Lt 61 04024 002 Switch Capacitor...

Page 206: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 2 1 6...

Page 207: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 217...

Page 208: ...ge 7 10 2 Hard Drive Controller Board The hard drive controller HDC board is a two sided PC board with the same form and size as those used in the Model II and Model 16 This board is designed to provi...

Page 209: ...e controller board by the state of the signal M2DEN A multiple and nor gate U15 is used to determine one of the following conditions and switch the direction of data flowtoward the host system The con...

Page 210: ...he host attempt an access of the controller status register while the WD1010 is using the internal bus the host will see a busy condition and should not attempt to issue any commands until the bus is...

Page 211: ...of a PAL16R6A U18 a 60 nsec delay line U37 and 3 D type flip flops Ul and U7 When data is being inspected from the drive its phase relationship must be determined with respect to the Vco clock The fun...

Page 212: ...rough the heads while writing data The other means of precomping is done by writing data either 12 nsec early or late when the heads are in the precomp area The WD1010 continually puts out the signals...

Page 213: ...tive high at U19 6 Place the other channel on DRUN You should see two index pulses spaced 16 67 msec apart 9 Adjust R2 until you can define seventeen separate low pulses on DRUN between the two index...

Page 214: ...controller board DO Logic one enables dma operation Dl Logic one enables interrupts D2 Not used D3 DEVEN Logic one enables access to the WD1010 D4 SFTRST Logic one triggers a 10 useereset one shot D5...

Page 215: ...countered with a bad block mark used for bad sector mapping 5 CA Sector Count This register contains the number of sectors to be transferred It is used only when multiple sector reads or writes are us...

Page 216: ...written as a zero always 10 CF Command Status Write The desired command is loaded here see the WD1010 manual for available commands Read Controller Status Register DO When set indicates an error has...

Page 217: ...surfaces for a total of 6 recording surfaces Each surface has a dedicated read write head attached to a common stepper arm mechanism Each surface has a total of 306 cylinders giving a total track cou...

Page 218: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Component Layout Hard Disk Controller 8898798 Rev A 229...

Page 219: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace Hard Disk Controller 8898798 Rev A Component Side 230...

Page 220: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Circuit Trace Hard Disk Controller 8898798 Rev A Solder Side 231...

Page 221: ...374104 C20 Capacitor 330 pF 50V C Disk NPO 8301332 C21 Capacitor 150 pF 50V C Disk NPO 8301153 C22 Capacitor 0 0068 uF 50V C Disk 10 8302684 C23 Capacitor 0 1 uF 50V Mono Axial 8374104 C24 Capacitor 0...

Page 222: ...207247 R12 Resistor 5 6 kohm 1 4W 5 8207256 R13 Resistor 4 7 kohm 1 4W 5 8207247 R14 Resistor 2 43 kohm 1 4W 1 MF 8200224 R15 Resistor 200 ohm 1 4W 1 MF 8200120 R16 Resistor 2 43 kohm 1 4W 1 MF 820022...

Page 223: ...rter 14 Pin 8020014 U20 IC 74LS04 Hex Inverter 14 Pin 8020004 U21 IC 74LS244 Octal Buffer 20 Pin 8020244 U22 IC 74LS04 Hex Inverter 14 Pin 8020004 U23 IC 74LS02 Quad 2 IN NOR 14 Pin 8020002 U24 IC 74L...

Page 224: ...14 TP 4 Staking Pin 8529014 TP5 Staking Pin 8529014 TP6 Staking Pin 8529014 TP7 Staking Pin 8529014 El Staking Pin 8529014 E2 Staking Pin 8529014 E3 Staking Pin 8529014 E4 Staking Pin 8529014 E5 Staki...

Page 225: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 236...

Page 226: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD 237...

Page 227: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 239...

Page 228: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD 241...

Page 229: ...Lists Exploded Views Contained in this section are the parts lists and exploded views for the various subassemblies of the Tandy 6000 6000 HD Some parts are noted but may not be available as individua...

Page 230: ...ink 8729125 2 1 Connector Power Cord 8519207 3 6 Nut KEPS Lock 4 40 8579003 4 1 Base Computer 8719476 5 4 Feet Bumpon 8590128 6 1 Cable Keyboard 8709402 7 1 Power On Switch AC Harness 8709596 8 1 PCB...

Page 231: ...Service Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD Figure 8 1 Exploded View Base Assembly 245...

Page 232: ...1 Cover Card Cage 8729211 3 2 Strips 3 8 x 1 4 x 7 8719482 4 1 Retainer Card Cage 8719525 5 1 Panel Left Card Cage 8729286 6 1 Motherboard 8897701 7 1 Main logic Board 8897702 8 1 Chassis Main 872914...

Page 233: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 8 2 Exploded View Card Cage Main Chassis and Power Supply 247...

Page 234: ...ANDY 6000 6000 HD 8 3 Floppy Disk Drive 248 Item Quan Description Part No 1 1 Mount Disk Drive 8729261 2 2 Disk Drive Assembly 8790123 3 1 Bar Rear Mounting 8729262 4 1 Bar Front Mounting 8729263 5 1...

Page 235: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 8 3 Exploded View Floppy Disk Drive Assembly 249...

Page 236: ...stic 8589097 6 1 Bar Rear Mounting 8729262 7 1 Bar Front Mounting 8729263 8 1 Bracket Lower Hard Disk 8729259 9 5 Spacer Antivibration 8589096 10 2 Wing Clips Bezel Overlay 8559057 11 1 Bezel Overlay...

Page 237: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 8 4 Exploded View Hard Disk Drive Assembly 251...

Page 238: ...PRODUCTS 8 5 Bezel Assembly Item Quan Description Part No 1 1 Stiffener Bezel 8729515 2 1 Bezel Front 8729261 3 1 Video PCB 8898018 4 1 Video Mount 8729517 5 1 CRT Assembly TCE 8790614 6 1 Contrast Co...

Page 239: ...Service Manual T TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Figure 8 5 Exploded View Bezel Assembly...

Page 240: ...000 6000 HD TANDY COMPUTER PRODUCTS 8 6 Reset Power On Indicator Module Item Quan Description Part No 254 Item Quan Description Part No 1 1 Indicator Power On 8469011 2 1 Switch Reset 8489055 3 1 Cabl...

Page 241: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 8 6 Exploded View Reset Power On Indicator Module 255...

Page 242: ...Manual TANDY COMPUTER PRODUCTS TANDY 6000 6000 HD 8 7 Case Top Assembly 256 Item Quan Description Part No 1 1 Case Top 8719469 2 1 Spring Bar 8729158 3 1 Door Rear 8719248 4 2 Bracket Strain Relief 8...

Page 243: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 8 7 Exploded View Case Top Assembly...

Page 244: ...ly Item Quan Description Part No 1 1 Nameplate Keyboard 8729261 2 1 Cover Keyboard 8719479 3 1 Bezel Keyboard 8719467 4 1 Keyboard Low Profile 8790554 5 1 Cable Keyboard 8709396 6 1 Base Keyboard 8719...

Page 245: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS Figure 8 8 Exploded View Keyboard Assembly...

Page 246: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 260...

Page 247: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 261 Appendices Appendix A Video Monitor Assembly Appendix B Floppy Disk Assembly Appendix C Hard Disk Assembly...

Page 248: ...Service Manual TANDY 6000 6000 HD TANDY COMPUTER PRODUCTS 262...

Page 249: ...tor 100 uF 16V 20 CE04C107M C301 Capacitor 220 pF 50V 10 CK45B1H221K C302 Capacitor 0 47 F 50V 10 CE04 RB 474K C303 Capacitor 56 pF 50v 10 C304 Capacitor 0 022 uF 50V 10 CQ92M1H223K C305 Capacitor 0 0...

Page 250: ...2A 250V 251000790A Integrated Circuits IC201 IC AN5763 V Process IC301 IC AN5753 H Process Resistors R101 Resistor 470 ohms 1 4W 5 RDl 4MZ S 471J RIO 2 Resistor 15k ohms 1 4W 5 RD1 4MZ S 15 3J RIO 3 R...

Page 251: ...DI 4MZ S 223J R307 Resistor 15k ohms 1 4W 5 RDl 4MZ S 153J R308 Resistor 100 ohms 2W 5 RSM2P 560J R30 9 Resistor 2 7k ohms 1 4W 5 RDl 4MZ S 272J R310 Not Used R311 Resistor 1 ohm 1 2W 5 RD1 2MZ S 1R0J...

Page 252: ...stor 2M ohms 176910640A Transformers T301 Transformers Drive 10851001MA T301 Transformers Flyback 10801003YA Transistors TR101 Transistor PNP 2SA733 P or LA7 33 P TRIO 2 Transistor NPN 2SC1313 G TRIO...

Page 253: ......

Page 254: ......

Page 255: ...RATING AND SERVICE MANUAL TM848 1E AND TM848 2E THINLINE FLEXIBLE DISK DRIVES 48 TRACKS PER INCH T andon c o r p o r ati on 20320 PRAIRIE STREET CHATSWORTH CALIFORNIA 91311 COPYRIGHT 1983 TANDON CORPO...

Page 256: ...andon C orporation T h is docum ent is in te n d e d to provide th e user w ith d e ta ile d in fo rm a tio n adequate fo r th e e ffic ie n t in s ta lla tio n o peration and service o f th e e q u...

Page 257: ...pecification s 2 1 2 4 E n v iro n m e n ta l S p e c ific a tio n s 2 1 S E C T IO N 3 O P E R A T IO N In tro d u c tio n 3 1 3 1 U n p a c k in g th e D riv e 3 1 3 2 P re in s ta lla tio n C hecko...

Page 258: ...te E ra s e C irc u its 4 7 Read D a ta C ir c u its 4 9 4 6 S pindle C o n tr o l 4 10 S pindle M o to r E nable C ir c u it 4 10 S pindle M o to r C ontrol C ir c u it 4 10 S E C T IO N 5 M A IN T E...

Page 259: ...tte L e v e r 6 10 F ro n t P a n e l 6 11 B rid g e A s s e m b ly 6 12 D riv e M o to r 6 13 Load A rm A s s e m b ly 6 15 T ra ck 0 Sensor A ssem bly 6 16 W rite P ro te ct Sensor A ssem bly 6 17...

Page 260: ...ats Eye P a tte rn s 5 5 5 5 H ead C a rria g e R e ta in in g and Cam S c re w s 5 6 5 6 Inde x T o D a ta B u r s t 5 7 5 7 In d e x Sensor s R e ta in in g S c r e w 5 8 5 8 O p tim u m H ead A z i...

Page 261: ...fic a tio n s 2 6 3 1 D riv e In te rfa c e Lines and P in A s s ig n m e n ts 3 3 3 2 D C Pow er C onnector P in A ssig nm en ts 3 6 3 3 O ption P a tc h in g 3 9 3 4 D iagnostic Mode O f O p e ra ti...

Page 262: ......

Page 263: ...a p a b ili tie s by u sin g bo th sides o f th e diskette 1 1 SCOPE OF THE DOCUMENT The T M 848 1E and TM 848 2E d rive s are ro ta tin g d is k m em ories designed fo r random access data e n try st...

Page 264: ...consists o f a d ire c t d rive spindle system a head p o s itio n in g system and a re a d w rite system The T M 848 1E is a single sided d riv e The TM 848 2E is a double sided d rive T he o n ly d...

Page 265: ...m ou n te d in a v e rtic a l or h o ri zo n ta l plane H ow ever th e lo g ic c irc u it board m u s t be on th e upperm ost side w hen th e d riv e is m o un te d h o riz o n ta lly The spindle is...

Page 266: ...FIGURE 1 1 DISK DRIVE...

Page 267: ...ns th e p h ysica l dim ensions o f th e drive 2 2 ELECTRICAL AND OPERATIONAL SPECIFICATIONS The e le c tric a l and o p e ra tio n a l sp e cifica tio n s are located in Table 2 1 2 3 RELIABILITY SPE...

Page 268: ...2 2...

Page 269: ...im e te rs 1 95 inches O utside T ra c k R adius B o th D rives 91 75 m illim e te rs 3 61 inches T M 848 2E Side 1 89 64 m illim e te rs 3 53 inches H ead L ife 15 000 m edia c o n ta ct hours D is k...

Page 270: ...ty p ic a l F o r surge c u rre n t re q u ire m en ts see F ig ures 2 2 and 2 3 5 v o lts D C Power 5 volts 5 percent a t 450 m illia m p e re s ty p ic a l T y p ic a l C u rre n t R equirem en ts...

Page 271: ...FIGURE 2 3 24 VOLT D C CURRENT CONFIGURATION 2 l a n d o n CORPORATION CHATSWORTH CALIFORNIA 91311 179056 001 REV A 2 5...

Page 272: ...ne in 10 seeks M ean T im e Betw een F a ilu re s 10 000 pow er on hours M ean T im e To R e p a ir 30 m in u te s TABLE 2 3 ENVIRONMENTAL SPECIFICATIONS T e m p e ra tu re O perating m edia dependent...

Page 273: ...HE DRIVE The d riv e has been designed so i t m a y be m ounted in an y plane i e u p rig h t h o riz o n ta l or v e rtic a l W hen m oun te d h o riz o n ta lly th e Logic c irc u it board side o f...

Page 274: ...m a x im u m le n g th o f te n feet and have a 26 to 28 gauge conductor co m p a tib le w ith th e connector to be used I t is recom m ended th a t the in te rfa c e cable have a c h a ra c te ris ti...

Page 275: ...s 1 th ro u g h 4 provide a m eans o f d a isy c h a in in g a m a x im u m o f fo u r drives to a con tro lle r O n ly one can be tru e low a t a tim e A n u n d e fin e d o p e ra tio n m ig h t re...

Page 276: ...equal to th e m a x im u m d a ta ra te 500 k ilo h e rtz 0 1 percent H ost co n tro lle rs m a y im p le m e n t w rite precom pensation c irc u its th a t recognize w o rs t case p a tte rn s and a...

Page 277: ...h w hen th e selected d riv e s R e a d W rite head is n o t on T ra c k 0 WRITE PROTECT The W rite P ro te ct sig n a l is provided to in d i cate to th e user th a t a w rite protected d is ke tte i...

Page 278: ...ow er is su pp lie d to th e d riv e th ro u g h a s ix p in A M P connector J2 m ou nted on the c irc u it board The m a tin g connector n o t supplied is A M P P a rt N u m b e r 1 480270 0 u s in g...

Page 279: ...FIGURE 3 2 CONTROL AND DATA TIMING REQUIREMENTS 3 7...

Page 280: ...a llo w th e user to select th e heads b y va rious m eans T h ey are im p le m ented b y re m o vin g th e s h o rtin g p lu g fro m th e D S l DS4 o p tio n pads HEAD SELECT USING DRIVE SELECT To u...

Page 281: ...l S ignal Low T rue M O L X M o to r C o n tro l S ignal H ig h T rue M O H X M o to r C o n tro l Select M C 1 M C 4 X R eady R X T ru e R eady T R X L e ve r Lock Solenoid D L X In Use L e ve r L o...

Page 282: ...g edge o f th e M o to r C ontrol sig nal W ith M o to r C o n tro l u sin g D riv e S elect or H ead Load th e M 3 and M 4 ju m p e rs d e te rm in e w h ic h m ethod o f M o to r C o n tro l is ena...

Page 283: ...FIGURE 3 3 LSI CIRCUIT BOARD ASSEMBLY 3 11...

Page 284: ...hen a tw o sided d iske tte is in s ta lle d in te r n a l c irc u itry gates th is s ig n a l w ith D rive Select I t sends a low true sig n a l to the c o n tro lle r in d ic a tin g th a t a double...

Page 285: ...ir o rig in a l c o n fig u ra tio n 4 Pow er on th e d rive 3 7 DISKETTES The T M 848 1E and T M 848 2E d rives use an IB M co m p a tib le e ig h t in c h d iske tte D is k ettes are a v a ila b le...

Page 286: ...betw een T racks 0 and 76 T h is te s t is used to exercise th e po sitio n e r system X 4 Toggle fro n t panel L E D w ith each revolutio n o f the disk T h is te s t toggles th e fro n t panel L E...

Page 287: ...f th e drive The L E D is on w hen w rite p ro te ct is tru e X X 12 C M o n ito r the status o f the lever position sw itch T h is te st is used to check th e le ve r p o sitio n sw itch T he fro n t...

Page 288: ...ings fo r th e d riv e h u b and d is k e tte in d e x hole are provided F ig u re 3 5 provides some h e lp fu l h in ts on th e care and h a n d lin g o f th e d riv e and diskettes In a d d itio n t...

Page 289: ...FIGURE 3 5 DISKETTE CARE AND HANDLING 3 17...

Page 290: ......

Page 291: ...o f electrom agnetics W hen c u rre n t flo w s in a coil o f w ire i t p ro duces a m a g n e tic fie ld The fie ld is confin e d in a core o f m a g n e tic m a te ria l around w h ic h the w ire is...

Page 292: ...tic fie ld s o f the stored d ata pass successively u n der th e head The cha n g in g fie ld s induce in th e head an A C vo lta g e s ig n a l w h ic h is th e n a m p lifie d and filte re d d iffe...

Page 293: ...u m b e r tw o sensor and Test P o in t 2 fo r in d e x n u m b e r one sensor T h is sig n a l is supplied to th e m icroprocessor fo r tim in g I t is also gated in te rn a lly in the L S I ch ip w...

Page 294: ...FIGURE 4 4 INTERCONNECT BLOCK DIAGRAM 4 4...

Page 295: ...FIGURE 4 6 TRACK O TIMING 4 5...

Page 296: ...icroprocessor STEPPER MOTOR CONTROL 4 4 READ WRITE HEAD POSITIONER The com ponents o f th e d riv e re q u ire d to posi tio n th e re a d w rite heads a t th e desired tra c k are 1 Step and D ire c...

Page 297: ...b e g in n in g o f W rite G ate u n til th e end o f th e tr im erase tim e READ WRITE HEAD ASSEMBLY The re a d w rite head s are glass bonded fe r rite cores m ounted in a ceram ic s tru c tu re The...

Page 298: ...ad a m p lifie r d u rin g th e w rite operation 6 The w rite d a ta in p u t is used to clock th e w a ve fo rm g e n erato r w h ic h selects a w rite d riv e r p ro v id in g a ground to fo rw a rd...

Page 299: ...to enable one o f the re a d w rite heads The o u tp u t sig n a l fro m th e re a d w rite head is a m p lifie d by a read a m p lifie r and filte re d by a lin e a r phase filte r to rem ove noise...

Page 300: ...host c o n tro lle r to th e in te rfa c e connector T h is s ig n a l is supplied to th e L S I chip w h ic h uses i t to enable th e m o to r c u rre n t c irc u it o f th e sp in dle m o to r co nt...

Page 301: ...g drives I f th e values m easured are w ith in tolerance or close to th e lim its th e suspected fa u lt is n o rm a lly caused by some o th e r problem C o m p le tin g o th e r checks and a d ju s...

Page 302: ...e c a lib ra tio n due date on th e c a lib ra tio n s tic k e r a ffix e d to th e equipm ent 5 3 POWER DRIVE SELECT CHECK The d riv e select check v e rifie s th e a c tiv ity L E D can be illu m in...

Page 303: ...in th e specified tolerance The m o to r speed is 360 R P M 1 5 percent I f the m o to r speed is o u t o f tolerance re fe r to the oroubleshooting guide 1 A p p ly pow er to th e d rive 2 In s e rt...

Page 304: ...FIGURE 5 2 TIMING DISK FIGURE 5 3 HUB CENTER LINE AND TRACK LOCATION 5 4...

Page 305: ...lo w e r head 7 Read T ra c k 38 fo r R a d ia l T ra c k a lig n m e n t o f th e lo w e r head 8 A d ju s t th e oscilloscope to observe a Cats Eye p a tte rn F ig u re 5 4 9 V e rify th e s m a lle...

Page 306: ...k 38 20 V e rify th e Cats Eye p a tte rn 21 I f a ll th e checks v e rify th e R a d ia l T ra c k a lig n m e n t is acceptable 22 I f a n y check does n o t v e rify th e head ca rria g e m s t be...

Page 307: ...n 15 G round Test P o in t 8 R ead D iffe re n tia lly A plus B B in v e rte d FIGURE 5 6 INDEX TO DATA BURST T im e B ase 50 m icroseconds p e r d iv is io n E x te rn a l T rig g e r T est P o in t...

Page 308: ...th e in d e x sensor w ith a fla t blade s c re w d rive r u n til th e inde x to d a ta b u rs t occurs 200 100 m ic ro seconds fro m th e le a d in g edge o f th e in d e x pulse 3 T ig h te n th e...

Page 309: ...n u te s T h is is th e o p tim u m head a z im u th a lig n m e n t F ig u re 5 9 depicts an a z im u th o f e x a c tly m in u s 18 m in u te s T h is is th e lo w e r lim it o f a l low able a z im...

Page 310: ...s a tis fa c to ry a d ju s t th e T ra c k 0 sw itch TRACK 0 SENSOR ADJUSTMENT 1 Loosen th e re ta in in g screw on th e base o f th e T ra ck 0 b ra c ke t F ig u re 5 11 2 R e tig h te n the screw...

Page 311: ...n w rite protected d is k e tte in to th e drive 2 Set up th e oscilloscope to read C hannel A U2 P in 14 C hannel B U 2 P in 15 V e rtic a l A m p litu d e 50 m illiv o lts per d iv is io n G round...

Page 312: ...oseconds per d iv is io n E x te rn a l T rig g e r Test P o in t 10 p o sitive edge 2 A p p ly pow er to th e drive 3 Select th e d rive 4 Seek to T ra c k 0 5 W rite a 2F p a tte rn on H ead 0 6 M e...

Page 313: ...ction 3 to ensure correct c o n fig u ra tio n o f the d rive 6 2 SOFT ERRORS S o ft e rro rs can be caused by a irb o rn e co n ta m in a n ts random e le c tric a l noise exces sive te m p e ra tu r...

Page 314: ...r spindle n o t tu rn in g D riv e M o to r n o t tu rn in g V e rify in te rfa c e m o to r on sign a l V e rify M o to r C o n tro l o p tio n jum pers C onnector loose o r disconnected Check connec...

Page 315: ...fective head s Replace H ead C arriage Assem bly W ill n o t read In te rfa c e in co rre ct V e rify select is tru e and w rite enable is false A lig n m e n t o ff V e rify R a d ia l T ra ck a lig...

Page 316: ...p ro te ct sensor check D efective w rite p ro te c t sensor Replace w rite p ro te ct sensor F a u lty Logic c irc u it board Replace Logic c irc u it board F a ils d riv e m o to r speed check See...

Page 317: ...D efective m edia C annot read Replace m edia See W ill n o t read F a ils cone ce n te rin g check D e fe ctive d iske tte D e fe ctive Cone A ssem bly D e fe ctive B rid g e A ssem bly D efective d...

Page 318: ...TERING Logic C irc u it B oard X X X Cone A ssem bly X X D is k e tte L ever A ssem bly F ro n t P anel X B rid g e A ssem bly X X D riv e M o to r A ssem bly X X X Load A rm A ssem bly X T ra ck 0 Se...

Page 319: ...to w a rd th e back o f th e d riv e about o n e h a lf inch 4 Rem ove i t fro m th e drive 1 Place the new c irc u it board on the drive 2 In s ta ll th e tw o m o u n tin g screws a t ta c h in g th...

Page 320: ...e 6 2 2 U n la tc h th e d is k e tte lever 3 S w in g th e Cone A ssem bly u p 90 de grees so th a t i t p o in ts to w a rd th e side o f th e d rive 4 C a re fu lly rem ove th e E R in g fla t wash...

Page 321: ...h e u n it 4 L a tc h th e d is k e tte lever 5 In s e rt th e screw th a t attaches th e cone b ra c k e t to th e cone a lig n m e n t arm F ig u re 6 2 6 E nsure th e Cone A ssem bly tu rn s fre e...

Page 322: ...e sh a ft 2 P u t a drop o f L o c k tite N u m b e r 234 on th e thre ads o f the d is k e tte le v e r s screw 3 In s ta ll and tig h te n th e d is k e tte le v e r s screw 4 P u t th e cover back...

Page 323: ...tiv ity L E D comes o u t of its m o u n tin g w ith no b in d in g 1 P u t th e fro n t pan el on th e drive ensur in g the A c tiv ity L E D goes in to its holder 2 In s ta ll th e fo u r m o u n ti...

Page 324: ...o u t th e tw o index L E D s fro m th e B rid g e Assem bly 3 In s ta ll th e tw o in d e x L E D s in to the B rid g e Assem bly 5 C a re fu lly l i f t o u t th e B rid g e A ssem bly to w a rd th...

Page 325: ...k to th e chassis The heat s in k is located on th e d riv e m o to r servo board F ig u re 6 9 1 Remove th e Logic c irc u it board 7 Rem ove th e th ree d rive m o to r m ount 2 Rem ove th e d is k...

Page 326: ...m o u n tin g screws F ig u re 6 8 3 In s ta ll and tig h te n th e h e a t s in k m o u n tin g screw 4 Route th e connector th ro u g h th e cable slo t F ig u re 6 9 5 B u n d le th e cable harness...

Page 327: ...e n su rin g th e load a rm p in is s ittin g u n d e r th e fro n t o f th e m o u n tin g screws and w asher 2 In s ta ll and tig h te n th e m o u n tin g screw a tta c h in g th e Load A rm A ssem...

Page 328: ...racket 5 Rem ove th e b ra cke t 6 L if t o ff th e T ra c k 0 Sensor A ssem bly INSTALLATION 1 In s ta ll th e T ra c k 0 Sensor A ssem bly 2 In s ta ll th e T ra c k 0 sensor m o u n tin g b ra cke...

Page 329: ...ee F ig u re 6 12 3 C u t th e tie w raps th a t h o ld the w ire s to th e cable harness and l i f t o u t th e W rite P ro te ct Sensor A ssem bly 1 U s in g th e o rig in a l m o u n tin g b ra cke...

Page 330: ...c h cables u s in g th e cable harness tie w raps 3 P lu g P3 in to th e c irc u it board 4 P e rfo rm th e checks and a d ju s tm e n ts in T able 6 2 MOTOR SWITCH ASSEMBLY REMOVAL 1 Remove P3 fro m...

Page 331: ...A ssem bly and upper in d e x sensors F igure 6 14 5 Remove th e d riv e m otor 6 Rem ove th e le ft guide r a il by p u sh in g in on th e center ta b o f th e ra il and push th e r a il o u t F ig...

Page 332: ...t r a il by pressing i t in to its m o u n tin g slots in th e chassis N O T E E nsure th e in d e x sensor cables are betw een th e chassis and ra il 4 In s ta ll th e d riv e m o to r 5 In s ta ll t...

Page 333: ...g i t out INSTALLATION 1 E nsure th e e je cto r sp rin g is hooked to th e bridge 2 In s e rt th e ejector 3 P u ll th e s p rin g back a tta c h in g i t to th e re a r o f th e ejector 4 In s ta ll...

Page 334: ...in to th e H ead C arriage A ssem bly F ig u re 6 17 2 Loop the stepper band arou nd th e step per p u lle y 3 A tta c h th e re a r o f th e band to th e sp rin g tensioner 4 A tta c h th e stepper b...

Page 335: ...e harness 5 L if t o u t th e S tepper M o to r A ssem bly N O T E Be c a re fu l n o t to dam age th e stepper band INSTALLATION 1 P lace th e S tepper M o to r A ssem bly in to th e d riv e s chassi...

Page 336: ...e H ead C a rriag e Assem bly 5 Rem ove th e ca rria g e guide ra ils fro m th e H ead C arriage Assem bly INSTALLATION 1 In s ta ll th e ca rria g e guid e ra ils in to th e carriage 2 U sin g th e...

Page 337: ...FIGURE 6 19 HEAD CARRIAGE 6 25...

Page 338: ......

Page 339: ...el 210750 000 Bridge Assembly 210196 000 Drive Motor 210754 000 Load Arm Assembly 210757 000 Track 0 Sensor Assembly 210758 000 Write Protect Sensor Assembly 210760 000 Motor Switch Assembly 210756 00...

Page 340: ...A 2...

Page 341: ...i t i A 3...

Page 342: ......

Page 343: ...nd c irc u it board d ra w in g s fo r th e T M 848 1E and T M 848 2E D ra w in g N u m b e r T itle Page N u m b e r 210772 R evisio n E L o g ic C irc u it B oard A ssem bly D ra w in g B 2 210771 R...

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Page 349: ...Ta n d o n CORPORATE OFFICES 20320 PRAIRIE STREET CHATSWORTH CA 91311 TELEPHONE NO 213 993 6644 TELEX NO 194794 TWX NO 910 494 1721 PRINTED IN U S A P N 179056 001A T5014A 11 83...

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Page 351: ...PERATING AND SERVICE MANUAL TM501 TM502 TM503 DISK DRIVES 345 TRACKS PER INCH Ta n d o n c o r p o r a t io n 20320 PRAIRIE STREET CHATSWORTH CA 91311 C O P Y R IG H T 1983 T A N D O N C O R P O R A T...

Page 352: ...pproval o f Tandon C orporation This document is intended to provide the user w ith detailed info rm ation adequate fo r the efficient installation operation and service o f the equipment involved How...

Page 353: ...trical and Operational Specifications 2 1 2 3 Reliability Specifications 2 1 2 4 Environmental Specifications 2 1 SECTION 3 OPERATION Introduction 3 1 3 1 Unpacking The Drive 3 1 3 2 Preinstallation C...

Page 354: ...dures 4 7 C o n tro l and D a ta C irc u it B o a rd A sse m b ly 4 7 F ro n t P anel L E D A sse m b ly 4 7 L in e a r B ra ke A sse m b ly 4 7 In d e x A sse m b ly 4 8 F ro n t P a n e l 4 10 S pin...

Page 355: ...n g P ack D esign C o n fig u ra tio n 1 3 16 3 12 R ecom m ended S h ip p in g P ack D esign C o n fig u ra tio n 2 3 18 3 13 R ecom m ended S h ip p in g P ack D esign C o n fig u ra tio n 3 3 19 3...

Page 356: ......

Page 357: ...ing disk memory device designed fo r random access data storage and retrieval Typical applications include w o r d p r o c e s s in g system s e n t r y le v e l microprocessor systems intelligent cal...

Page 358: ...the ap propriate track by selecting the desired head Typically the drive uses M F M w rite and read recording methods Data recovery electronics in clude a low level read am plifier differentiator a z...

Page 359: ...e contained in Figure 2 1 2 2 ELECTRICAL AND OPERATIONAL SPECIFICATIONS The electrical and operational specifications are contained in Table 2 1 Typical starting current re quirements at nominal volta...

Page 360: ...N ote W eight is 3 0 kilogram s 6 5 pounds m axim um FIGURE 2 1 DISK DRIVE OUTLINE DRAWING T andon CORPORATION CHATSWORTH CALIFORNIA 91311 179045 001 REV A 2 2...

Page 361: ...P M 1 percent Average Latency 8 33 milliseconds Start Time 15 seconds m axim um Stop Tim e 15 seconds m axim um Seek Time 3 milliseconds track to track Head Settling Tim e 15 milliseconds last track a...

Page 362: ...0 4 kilobytes POWER REQUIREMENTS 12 volts D C 10 percent 1 5 amperes typical 5 amperes maximum during m otor start up not to exceed 12 seconds 2 amperes maxim um running w ith no more than 50 m illivo...

Page 363: ...FIGURE 2 2 TYPICAL STARTING CURRENTS T andon CORPORATION CHATSWORTH CALIFORNIA 91311 179045 001 REV A 2 5...

Page 364: ...ts to reread data p ro viding that the w riting o f the data previously has been verified as correct The seek error rate is not to exceed one error in 1 X 106 seeks MEDIA DEFECTS A n y defects on the...

Page 365: ...Relative H u m id ity 8 to 80 percent noncondensing Relative H u m id ity G radient Operating 20 percent per hour Nonoperating Below that causing condensation M axim um W et Bulb Temperature 26 C 78 8...

Page 366: ......

Page 367: ...disk may result N O TE The inside chamber o f the drive is a sealed compartment that must not be opened W hen returning the drive to the service center be Before applying power to the drive inspect fo...

Page 368: ......

Page 369: ...D C power see Figure 3 4 Table 3 1 contains interface lines The interface description o f the connectors and the location o f each is contained in this section J1 P1 CONNECTOR Connection to J 1 is th...

Page 370: ...FIGURE 3 2 J1 EDGE CONNECTOR DIMENSIONS FIGURE 3 4 J3 POWER CONNECTOR 3 4 FIGURE 3 3 J2 EDGE CONNECTOR DIMENSIONS...

Page 371: ...22 21 s o Ready 24 23 s I Step 26 25 s I Drive Select 0 28 27 s I D rive Select 1 30 29 s I D rive Select 2 r 32 31 s I D rive Select 3 P I 34 33 s I D irection In P2 1 2 s o D rive Select 3 4 s Spare...

Page 372: ...d in a m ultiple drive system and those that do the m ultiplexing The input control signals to be m ultiplexed are Reduced W rite C ur rent W rite Gate Head Select Line 2 Head Select Line 21 Head Sele...

Page 373: ...FIGURE 3 5 RADIAL CONFIGURATION 3 7...

Page 374: ...FIGURE 3 6 DAISY CHAIN CONTROL LINES...

Page 375: ...ferred from the drive In addition the inac tive state enables the step pulse to step the read write actuator HEAD SELECT LINES 2 21 22 These three lines provide for the selection of each read write he...

Page 376: ...o f m o tion defined by the Direction In line The access m otion is initiated at the logical true to logical false transition or the trailing edge o f this signal pulse A n y change in the Direction...

Page 377: ...eek algorithm fo r the user The user need only issue step pulses in accordance w ith the tim ing shown see Figure 3 9 Step pulses are issued in a 1 1 ratio to the cylinders moved I f more pulses are i...

Page 378: ...iver transistor is o ff and the collector c u to ff is a maxim um o f 250 microamperes A ll J l output lines are enabled by the respective Drive Select lines The Seek Complete signal goes true when th...

Page 379: ...ol lector drive see Figure 3 7 This signal goes active only when the drive is programmed as D rive X X 0 1 2 or 3 by program m ing the shunt on the drive and the Drive Select X line at J l P l is ac t...

Page 380: ...ocks located on the logic circuit board I f jum per configurations are changed power should be cycled o ff and on so that the m icroprocessor can recognize the new con figuration 3 7 SHIPPING PACK AND...

Page 381: ...Install fo r Type 1 8 m otor RTW 7 Read Term inator I Close only at end drive o f daisy chain data Closed W TW 8 W rite Term inator I fo r radial data S4W9 Drive Select 4 o Install one o f fo u r plu...

Page 382: ...FIGURE 3 11 RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 1...

Page 383: ...FIGURE 3 11 CONTINUED RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 1 3 17...

Page 384: ...FIGURE 3 12 RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 2 3 18...

Page 385: ...FIGURE 3 13 RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 3 3 19...

Page 386: ...FIGURE 3 13 CONTINUED RECOMMENDED SHIPPING PACK DESIGN CONFIGURATION 3 3 20...

Page 387: ...FIGURE 3 14 LOAD GRAPH 3 21...

Page 388: ......

Page 389: ...lent is recommended 1 Oscilloscope T ektronix 465 vertical and horizontal sensitivity plus three percent specified accuracy w ith three 10X p ro bes each w ith individual ground leads 2 Counter Tim er...

Page 390: ...FIGURE 4 1 TEST POINT LOCATIONS...

Page 391: ...er Check Connector P 5 Readjust Index sensor Replace sensor Replace logic board N o Track 0 N ot selected Track 0 sensor not plugged in Track 0 sensor misadjusted Track 0 sensor faulty Logic board fau...

Page 392: ...o speed not turning Spindle circuit board not plugged in Check Connector P 12 Spindle m otor not plugged in Check Connectors P 10 and P H Faulty Spindle circuit board see Figure 4 2 Replace circuit bo...

Page 393: ...ready Does not w rite N o W rite Gate fo r w riting Check W rite Gate interface line N ot selected Check drive select jum per Heads not selected See Does not read Head cable not plugged in Check Conne...

Page 394: ...o FIGURE 4 3 READ DATA WAVEFORMS 15 TPR AND 14 TPR o 4 6...

Page 395: ...Connectors J4 and J5 from the circuit board 3 Slide the circuit board tow ard the side o f the fram e lif t up on the free side o f it and remove rem aining connectors To replace this assembly reverse...

Page 396: ...ve the Index Assembly 1 Remove the C ontrol and Data C ircuit Board Assembly REPLACEMENT 2 Loosen the lock nut on the Index Assembly bracket 3 Unscrew the Index Assembly and remove REPLACEMENT T o rep...

Page 397: ...FIGURE 4 4 INDEX SENSOR 4 9...

Page 398: ...ace connectors single turn to its approxim ate center position 2 Using a dual channel oscilloscope connect one channel to R26 resistor lead closest to the power transistor leads on Spindle Con tro l C...

Page 399: ...ck 0 Sensor Assembly 1 Remove the C ircuit Board Assembly 2 Loosen the screw on the Track 0 Sensor Assembly m ount 3 Swing the m ount clear and remove the screw that holds the Track 0 Sensor Assembly...

Page 400: ...FIGURE 4 6 TRACK 0 ADJUSTMENT 4 12...

Page 401: ...purchase as spare replacement parts The items w ith o u t alpha designators on the drawings are fo r reference only and cannot be purchased as spare replacement parts I f an assembly has been determin...

Page 402: ...mbly 187010 001 Track 0 Assembly 187174 001 Frame Assembly 187288 001 Front Panel 187323 001 Spindle Control Board 187065 001 Logic Board 187345 002 Front Panel L E D Assembly 187018 001 Single Pack S...

Page 403: ...A 3...

Page 404: ...A 4...

Page 405: ...A 5...

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Page 407: ...r the TM 500 series o f disk drives Drawing N um ber T itle Page Num ber 187340 001 R E V L C ontrol and D ata C ircuit Board Schematic B 2 B 3 B 4 187345 001 R EV S C ontrol and Data C ircuit Board...

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Page 416: ...ANADA BARRIE ONTARIO L4M 4W5__________ TANDY CORPORATION AUSTRALIA___________ ____________ BELGIUM_____________ LUC__________ _ 91 KURRAJONG AVENUE PARC INDUSTRIEL BILSTON ROAD WEONESBURY MOUNT DRUITT...

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