Tandy 26-3334 Service Manual Download

Page: 109 / 129

Summary of Contents for 26-3334

Page 1: ...TANDY Service Ul COLOR COMPUTER 3 IMTSC PAL VERSION with 512K Expansion RAM Card Catalog Number 26 3334 CUSTOM MANUFACTURED FOR RADIO SHACK A DIVISION OF TANDY CORPORATION ...

Page 2: ...09E MBL68B09E HD68B09E IC1 30 5 2 Memory RAM 34 5 3 TCC1014 VC2645QC 36 5 4 PAL Encoder PAL Version Only 38 5 5 PIAs IC4 and IC5 39 5 6 Keyboard Interface IC5 40 5 7 ROM IC2 41 5 8 DAC Circuitry IC7 42 5 9 SALT Circuitry 44 5 10 Cassette Tape Format Information 47 5 11 RS 232C Connector JK3 47 5 12 Cartridge Connector CNl 49 5 13 Power Transformer 52 5 14 Joysticks 52 5 15 TV Switch Box NTSC Versi...

Page 3: ...8 NTSC Vers ion 58 PAL Version 61 6 11 Major Waveforms 64 NTSC Vers ion 64 PAL Version 70 SECTION VII 512K EXPANSION RAM CARD PCB VIEWS 78 ELECTRICAL PARTS LIST 79 SECTION VIII NTSC VERSION PCB VIEWS 82 ELECTRICAL PARTS LIST 84 EXPLODED VIEW PARTS LIST 90 EXPLODED VIEW 91 SEMICONDUCTOR INFORMATION 93 SCHEMATIC DIAGRAM 103 SECTION IX PAL VERSION PCB VIEWS 1 08 ELECTRICAL PARTS LIST 1 1 EXPLODED VIE...

Page 4: ...09E Read Write Timing at 0 89 MHz 33 5 4 DRAM Block Diagram 34 5 5 DRAM Timing 35 5 6 Color Computer 3 Address Decoding 36 5 7 MMU Block Diagram 37 5 8 PIA Block Diagram 39 5 9 Color Computer 3 Keyboard Array 40 5 10 DAC Block Diagram IC7 42 5 11 SALT Block Diagram IC8 44 5 12 Color Computer 3 Power Supply 45 5 13 I O Circuitry 45 5 14 RS 232C Connector Pinout 48 5 15 Joystick Schematic 52 5 16 An...

Page 5: ...g either channel on the TV 3 4 for NTSC and 1 2 for PAL version is also located on the rear panel of the unit 1 2 System Description The primary functions of the Color Computer 3 are performed by four Large Scale Integration LSI chips plus Random Access Memory RAM and Read Only Memory ROM These four chips are labeled on the block diagram as CPU ACVC and two PIAs With only these four chips plus Ran...

Page 6: ...iming and device selection ACVC comprises the VDG Video Display Generator function which supports High Resolution mode in addition to all other modes included in the Color Computer 2 During High Resolution mode it generates 40 x 24 or 80 x 24 text screen and 320 x 192 or 640 x 192 graphics screen It is also designed to output two different video signals composite video and analog RGB ACVC can expa...

Page 7: ... 7 ...

Page 8: ...ister Chip Control Register 68B09E Vector Register S7FFOO S7E000 S7COO0 S7A0O0 78000 70600 70400 70000 S6E00O S6C000 68000 60000 68B09E VECTOR h CONTROL REGISTER I O SUPER EXTENDED BASIC CARTRIDGE ROM COLOR BASIC EXTEND COLOR BASIC STANDARD TEXT SCREEN HIGH RESOLUTION TEXT SCREEN HIGH RESOLUTION GRAPHIC SCREEN SOOOOO O i o o 5 o u X 5 n Figure 1 2 Color Computer 3 Memory Map 8 ...

Page 9: ...to CPU Enabled 0 Flag set on the falling edge of HS 1 Flag set on the rising edge of HS Changes FFOO to the data direction register LSB of the two analog MUX select lines FF02 BIT KEYBOARD COLUMN 1 KEYBOARD COLUMN 2 KEYBOARD COLUMN 3 KEYBOARD COLUMN 4 KEYBOARD COLUMN 5 KEYBOARD COLUMN 6 BIT BIT BIT BIT BIT BIT BIT KEYBOARD COLUMN 7 RAM SIZE OUTPUT KEYBOARD COLUMN 8 FF03 CO IRQ to CPU Disabled 1 1 ...

Page 10: ...BIT RS 232C DATA INPUT BIT 1 SINGLE BIT SOUND OUTPUT BIT 2 RAM SIZE INPUT BIT 3 RGB Monitor Sensing INPUT BIT 4 VDG CONTROL OUTPUT BIT 5 VDG CONTROL OUTPUT BIT 6 VDG CONTROL OUTPUT BIT 7 VDG CONTROL OUTPUT CSS GMO UP PER LOWER CASE GM1 INVERT GM2 A G FF23 FIRQ to CPU Disabled 1 FIRQ to CPU Enabled BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT fO sets flag on falling edge CART U BIT Control of the Cartridge In...

Page 11: ...NIT1 BIT 7 BIT 6 BIT 5 TINS Timer Input Select 1 70 nsec BIT 4 BIT 3 BIT 2 BIT 1 BIT TR MMU Task Register Select 63 psec FF92 FF93 Interrupt Request Enable Register IRQENR Interrupt from Timer enabled Horizontal Border IRQ enabled Vertical Border IRQ enabled Serial Data IRQ enabled Keyboard IRQ enabled Cartridge IRQ enabled Fast Interrupt Request Enable Register FIRQENR Interrupt from Timer enable...

Page 12: ...R2 1 1 1 1 1 Burst phase inverted 1 monochrome on composite 1 50 Hz vertical sync Lines per row See table below Lines per row See table below Lines per row See table below LPR1 LPRO 1 1 1 1 Lines per character row one two three eight nine reserved twelve reserved Graphics modes CoCo 1 and CoCo 2 only CoCo 1 and CoCo 2 only CoCo 1 and CoCo 2 only FF99 BIT BIT BIT BIT Video Resolution Register LPF1 ...

Page 13: ...ical Scroll Register BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 VSC3 Vert Scroll BIT 2 VSC2 BIT 1 VSC1 BIT VSCO NOTE In the CoCo mode the VSC s must be initialized to OF hex FF9D Vertical Offset 1 Register BIT 7 Y18 Vert Offset BIT 6 Y17 BIT 5 Y16 BIT 4 Y15 BIT 3 Y14 BIT 2 Y13 BIT 1 Y12 BIT Yll FF9E Vertical Offset Register BIT 7 Y10 Vert Offset BIT 6 Y9 BIT 5 Y8 BIT 4 Y7 BIT 3 Y6 BIT 2 Y5 BIT 1 Y4 BIT Y3 NOTE...

Page 14: ... 1 XI Horizontal Offset address BIT XO Horizontal Offset address NOTE HVEN enables a horizontal screen width of 128 bytes regardless of the HRES bits and CRES bits selected This will allow a virtual screen somewhat larger than the displayed screen The user can move the window the displayed screen by means of the horizontal offset bits In character mode the screen width is 128 characters regardless...

Page 15: ...f memory to address These registers are divided into 2 sets 8 registers per set The TR bit of FF91 task register select bit determines which set is selected The relationship between the data in the task register and the generated address is as follows Bit Corresponding memory address D5 D4 D3 D2 Dl DO A18 AI7 A16 A15 A14 A13 DO D5 CPU DATA AI3 AI5 TR bit AO A3 AI3 AI8 Extended addresses When the C...

Page 16: ... order for the MMU to function the CoCo bit of FF90 must be cleared and the M P bit of FF90 must be set Prior to doing this the desired addressing information for each segment must be loaded into the designated set of task registers For example if a standard 64K map is desired in the top of 512K RAM with the TR bit set to 0 the following values should be pre loaded into the MMU MMU Location addres...

Page 17: ...Binary Hex White Black Bright Green Medium Green Dark Green Medium Magenta 111111 000000 010010 010000 000010 101000 3F 00 12 10 02 28 110000 000000 100010 010010 000010 010101 30 00 22 12 02 15 For CoCo compatibility the following values should be loaded upon initialization NOTE These are the RGB values FFBO Green 12 FFB1 Yellow 36 FFB2 Blue 09 FFB3 Red 24 FFB4 Buff 3F FFB5 Cyan 10 FFB6 Magenta 2...

Page 18: ... 2 320 16 1 1 1 320 4 1 1 256 16 1 1 256 4 1 256 2 1 160 16 1 1 1 In addition to the above modes the previous CoCo modes are available COLOR COMPUTER MODE SELECTION MC6883 SAM DISPLAY MODE REG FF22 V2 VI V0 7 6 5 4 3 Alphanumerics X X CSS Alphanumerics Inverted X X CSS Semigraphics 4 X X X 64 X 64 Color Graphics 1 CSS 128 X 64 Graphics 1 1 CSS 128 X 64 Color Graphics 1 1 CSS 128 X 96 Graphics 1 1 ...

Page 19: ... Attribulte byte BIT 7 BLINK Characters BIT 6 UNDLN Characters BIT 5 FGND2 Foreground BIT 4 FGND1 Foreground BIT 3 PGNDO Foreground BIT 2 BGND2 Background BIT 1 BGND1 Background BIT BGNDO Background blink at 1 2 sec rate are underlined color bit pallette addr color bit pallette addr color bit pallette addr color bit pallette addr color bit pallette addr color bit pallette addr BOTE Attributes are ...

Page 20: ...cond Pixel Bit 4 PAO Second Pixel Bit 3 PAI Third Pixel Bit 2 PAO Third Pixel Bit 1 PAI Fourth Pixel Bit PAO Fourth Pixel 2 Color Modes CRES1 0 CRESO 0 Byte from DRAM Bit 7 PAO First Pixel Bit 6 PAO Second Pixel Bit 5 PAO Third Pixel Bit 4 PAO Fourth Pixel Bit 3 PAO Fifth Pixel Bit 2 PAO Sixth Pixel Bit 1 PAO Seventh Pixel Bit PAO Eighth Pixel Pallette Addresses PA3 PA2 PAI PAO 1 1 1 1 1 1 1 1 1 1...

Page 21: ...s of each two address group data is don t care the bit is set by writing to the lower address the bit is cleared The graphics modes and vertical offset bits are valid only in the CoCo mode but the other two bits are valid anytime Note the only semigraphics mode supported is Semi Four FFDF FFDE FFD9 FFD8 FFD3 FFD2 FFD1 FFD0 FFCF FFCE FFCD FFCC FFCB FFCA FFC9 FFC8 FFC7 FFC6 FFC5 FFC4 FFC3 FFC2 FFC1 ...

Page 22: ...tor MS FFFB SWI1 vector LS FFFA SWI1 vector MS FFF9 IRQ vector LS FFF8 IRQ vector MS FFF7 FIRQ vector LS FFF6 FIRQ vector MS FFF5 SWI2 vector LS FFF4 SWI2 vector MS FFF3 SWI3 vector LS FFF2 SWI3 vector MS FFF1 Reserved FFFO Reserved FFEF FFEO Not used LS Least significant address byte MS Most significant address byte 22 ...

Page 23: ...512K KEYBOARD 57 keys microprocessor scanned matrix Number of keys 57 keys Alphabetical characters 26 keys A to Z Numeric characters 10 keys 0 to 9 Space key 1 key Shift key 2 keys Clear key 1 key Enter key 1 key Break ESC key 1 key Punctuation key 7 keys Directional Control key 4 keys Function key 2 keys Fl and F2 Control key 1 key Alternate key 1 key 57 keys 23 ...

Page 24: ...te interface 5P DIN 1500 baud Analog input inter face for JOYSTICK 6P DIN x 2 Bus line 40 PIN conne CONTROLS Power switch Push Reset switch Key Channel selector switch Slide RF OUTPUT r CH Frequency Video NTSC 4 3 61 25 0 25 MHz 67 25 0 25 MHz CH Frequency Video PAL 1 57 25 0 25 MHz 2 64 25 0 25 MHz Output iinpedance 7 5 ohm RF Output terminal RCA JACK RF Output level NTSC PAL 70 5dBp 2 67 _4 dBu ...

Page 25: ...0 11 Blue 0 6 0 i L 2 0 0 2 Vdc RL 75ohm positive L 2 0 0 2 Vdc RL 75ohm positive 2 0 0 2 Vdc RL 7 5ohm positive 1 8 0 2 Vdc RL 7 5ohm positive 1 8 0 2 Vdc RL 7 5ohm positive 1 8 0 2 Vdc RL 75ohm positive Hsync TTL level positive Vsync TTL level positive Sound Less than l OVp p RL 600ohm NTSC AC 120V 60Hz 0 2 Amp RMS typical PAL AC 240V 50HZ 0 125 Amp RMS typical 2 2 Physical DIMENSIONS Cabinet si...

Page 26: ...3 2 If it is necessary to remove the shield from the PCB do so by removing the 16 rivets which attach it to the PCB 3 2 Assembly Assemble the Color Computer 3 in the reverse order of disassembly The PCB shield is attached to the PCB with metal rivets These shields must be in place to provide proper RFI shielding Set the wire assembly from the transformer and flat cable from the keyboard to the con...

Page 27: ...d off into the corresponding hole on the computer PCB 5 Connect the computer s AC cord and signal cables to a TV monitor and run the following program to verify proper operation of the new memory chips 6 Secure the top and bottom cabinets L L m 2 O JiC IB iC 19 licir J C65 CN4 5 C 65 1 lor PAi_ verftmn 1 J Figure 3 3 Main PCB Figure 3 4 512K RAM Card Test Prograra 10 WIDTH 40 PALETTE 0 0 PALETTE 7...

Page 28: ... IT oo m 13Z 3 LU J li a i z o X M a 5 if Si s TO IE a CO HI h 2r8 O I CM O to JUL 3 VMOB 0300030 o 2S 0S I d3ddna sna TT frT n h 5 I 5 v t II M eg o VVV l UO N 1 s a u m O I 01 u M yaddna o D to cc Z I o 5 t cc 3 a 3Jina U0133NN03 Nld Ot 28 ...

Page 29: ... IS IS 1 J 1 y 1 U 1 r in y y z X o IE 1 1 L f J CM r T i O 1 CM 1 iMou f 0300030 en 80 ji u j u I o 1 r i II II _l CD LU I 1 cj ft 1 1 LU 13 Cfi l J Ice CO IM 1 O N N i t cj 0 Hajjna 1 Q 5 s t 00 IT a Lii v Q a 1 Q IT 1 1 O 13 m V LU EC a a J to Sc M cc t 3 CC 1 Q 5 i i 1 If 3 J tri i a cc u ddfia sna 1 s I c 1 II CL a DC LU to 7 QyU o5 U ygjjna s a a n 2 i N II z HOJ O3NN00 Nld Ot o 29 ...

Page 30: ...erconnecting lines the processor possesses Another is the size of the internal registers and the size of the mathematical and logical operations supported by the processor Although the 68B09E has an 8 bit data bus internally it contains four 16 bit registers and two additional 8 bit registers which may be linked together to form another 16 bit register The 68B09E also supports some 16 bit mathemat...

Page 31: ...the CPU are used for control functions both input control and output control Of course the Vcc pin is the power input line to the CPU and the GND line is the return reference for both power and signal The E and Q lines are the clock inputs to the CPU These clock signals must be present for the CPU to function In the Color Computer 3 these signals are provided by the advanced color video chip IC6 a...

Page 32: ... from the Vector Table see the memory map in Section I System Description For the interrupt routines registers are preserved on the Stack to be restored upon receipt of the RTI Return from Interrupt instruction Other control lines used in the Color Computer 3 are TSC Three State Control and the R W Read Write line The TSC line is an input intended for use in multiprocessor or DMA environment and w...

Page 33: ... DATA TIMING 0 5V DATA VALU b 2 0V JD 0 8V NOT VALID 2 4V 1117ns 559 ns V0 5V R W 2 4V ADDR BA BS 0 5V DATA 0 5V _ 0 5V St 0 5V 2 4V 2 4V 2 4V J e p 5V 2 4V _0 5V 2 4V DATA VALID 0 5V WRITE DATA TIMING l S 2 4V 0 5V NOT VALID Figure 5 3 MC68B09E Read Write Timing at 0 89 MHz Values within parentheses are for 1 78 MHz 33 ...

Page 34: ...ant eight addresses the row addresses the column addresses are presented along with CAS If the present cycle is a read cycle WE Write Enable is held high and the data is retrieved from the appropriate cell and presented at the output pin some time later The actual time depends on the access time of the DRAM During a write cycle the data and WE signal are active prior to CAS and are latched in at C...

Page 35: ...tRSH tCAS 140ns 4 4 trow tOES tRP 105 ns tCPN 140ns tf HH j smK tCAC tRAC Hl Z tRCH tOFF tOEZ VAUI DATA r z Write Cycle RAS VIH VIL CAS VIH VIL A0 A7 VIH 7 7 VIL y WE VIH VI L tASR tRC tAR tRAS 280 ns 175 ns tRCD tRAH tASC 35ns 35ns ROW ADDRESS tCAH COLUMN ADDRESS 1 01 1 04 VIH VIL tWCS tWCR tWP tDS tCSH tRSH tCAS Z 140 ns tWCH tDH tRP 105 ns J I tCPN _ 140 ns 2 A VALID DATA tDHR Fig 5 5 DRAM Timi...

Page 36: ...C during the low time of E Video portion During each access whether by the CPU or the Video the ACVC must provide appropriately synchronized RAS and CAS signals as well as the corresponding address signals to the DRAMs Note that the DRAM access time must be twice as fast as that required by the CPU alone in order to be able to respond to VDG accesses In order for the ACVC chip to provide the appro...

Page 37: ...ignal Since composite video signal is specially designed for NTSC systenij the PAL Encoder circuit is used to encode the RGB signal to the PAL signal For this purpose the VSYNC and HSYNC output from pins 55 and 56 of IC6 are provided to the PAL Encoder as a composite sync signal through the inverter IC15 and mixing circuit Qll D15 D17 The output of PAL Encoder that is the PAL system composite vide...

Page 38: ...ider is connected to the programmable divider part of IC102 where a divisor of 4 is used to complete the count down to 15 611 kHz IC102 also contains a phase comparator part and it compares this divided 15 611 kHz with the HSYNC signal which is counted down to 15 611 kHz from the master oscillator in IC6 The phase comparator then generates a control voltage in proportion to the phase and frequency...

Page 39: ...ection within the PIA Two of the four lines function only as interrupt inputs and the other two lines may be used as interrupt inputs or data outputs PIA IC5 is used mainly for the keyboard Data register B pins 10 17 is programmed as an output and is used to strobe the keyboard columns The first seven lines of data register A pins 2 8 are programmed as inputs and are used to read the keyboard rows...

Page 40: ...increase in key contact resistance due to prolonged use and therefore should result in a highly reliable keyboard interface To read the keyboard only one column is enabled by writing a zero in the bit that corresponds to that column and by writing ones in all the other bits If a key is being pressed in that column one of the input lines will be a zero and the key location will correspond to the bi...

Page 41: ...gister B is an input for the memory size Pin 11 of register B is the single bit sound output Pin 10 is the RS 232C signal input pin The control and interrupt pins of PIA IC4 also serve various functions CA1 pin 40 is the input for the signal CD a status interrupt input for the RS 232C interface CA2 is an output used to control the cassette motor CB1 is the cartridge interrupt input Whenever a cart...

Page 42: ... of control are used by the DAC to specify a discrete internal analog level This level is one of the sound inputs to the sound multiplexer It is also used as a reference for a comparator the other input of which is one of the four joystick inputs Finally the DAC signal is attenuated and used as the cassette recording signal for data storage There are two select inputs to the DAC chip Sel A and Sel...

Page 43: ...oduce maximum volume If the cassette is the selected input then sound from the cassette recorder is routed to the sound output This level follows the input level up to 3 9 volts p p at which point it clips the input waveform Therefore the volume control on the cassette should not be set higher than the level which provides 3 9 volts p p to the DAC chip Similarly the cartridge may supply the sound ...

Page 44: ...DC and used for the RS 232C output drivers The negative voltage is not used anywhere else in the computer Dl and D2 form a full wave center tapped rectifier with a positive output which is filtered by electrolytic capacitor C29 This positive voltage is applied to the collector of pass transistor Ql and is used to power the SALT chip at pin 16 The SALT chip internally regulates the positive voltage...

Page 45: ...tor R15 to the output connector R15 serves to limit the amount of current drawn from this output and prevents damage to the SALT chip if the output Cat the connector is inadvertently shorted to an external voltage such as 12 VDC which may be present on some RS 232C connectors The input level converters have the task of converting incoming RS 232C voltage levels to standard TTL signals These voltag...

Page 46: ...ossing detector The output of the zero crossing detector is an LS TTL compatible level and is coupled into PIA IC4 The final function of the SALT chip is to drive the cassette relay A TTL signal from PIA IC4 enters pin 10 of the SALT chip where it is connected to the base of an internal Darlington transistor the emitter of which is grounded The collector exits the SALT chip at pin 9 and is connect...

Page 47: ...byte 55H The End of File block is a standard block with a length of 0 The Namefile block is standard block with a length of 15 bytes OFH The 15 bytes of data provide information to BASIC and are employed as described below 1 Eight bytes for the program name 2 One file type byte 00H BASIC Program 01H Data File 02H Machine Code Program 3 One ASCII flag byte 00H Binary FFH ASCII 4 One Gap flag byte 0...

Page 48: ...inter 3 Ground 4 Connected to the Serial Data Input of the printer If your printer does not provide a status line then pin 2 must be connected to a positive voltage of 3 to 12 volts Thi3 tells the computer that the printer is ready all of the time In order to operate the software must make several assumptions about the printer These assumptions are 1 The printer operates at 600 baud 2 The printer ...

Page 49: ... the processor address and data lines are in the high impedance mode making it possible for external devices to access RAM and ROM The processor may be HALTed indefinitely without any loss of internal data NMI This is the non maskable interrupt input to the CPU RESET This is the master system reset and power up clear signal E Q These are the two clock signals for the MC68B09E CPU CART This is an i...

Page 50: ...UD RATE DECIMAL MSB VALUE LSB HEXADECIMAL MSB VALUE LSB 120 BAUD 300 BAUD 600 BAUD 1200 BAUD 2400 BAUD 1 202 180 87 41 18 01 00 00 00 00 CA BE 57 29 12 LINE DELAY DECIMAL MSB VALUE LSB HEXADECIMAL MSB VALUE LSB 288 SECONDS 576 SECONDS 1 15 SECONDS 64 128 255 255 40 80 FF 00 00 FF WIDTH DECIMAL VALUE HEXADECIMAL VALUE 16 CHARACTERS LINE 32 CHARACTERS LINE 64 CHARACTERS LINE 255 CHARACTERS LINE 16 3...

Page 51: ... Bit 6 17 D7 CPU Data Bit 7 18 R W CPU Read Write Signal 19 AO CPU Address Bit 20 Al CPU Address Bit 1 21 A2 CPU Address Bit 2 22 A3 CPU Address Bit 3 23 A4 CPU Address Bit 4 24 A5 CPU Address Bit 5 25 A6 CPU Address Bit 6 26 A7 CPU Address Bit 7 27 A8 CPU Address Bit 8 28 A9 CPU Address Bit 9 29 A10 CPU Address Bit 10 30 All CPU Address Bit 11 31 A12 CPU Address Bit 12 32 CTS Cartridge Select Sig...

Page 52: ... 5 15 shows a schematic of the Joystick Assembly It simply consists of a push button switch for the fire button and the dual potentiometers connected by a mechanical assembly The mechanical assembly allows both potentiometers to be changed at the same time This gives the effect of a two dimensional control The potentiometers are connected so that 5 volts are applied to one side of the variable res...

Page 53: ...mputer output is connected through a 75 ohm coaxial cable to the phono plug input on the switch box From the computer the signal is connected to a balun in the switch box which matches the modulator s 75 ohm output impedance to a TV s 300 ohm antenna input impedance This signal is then connected to the switch The switch is specially designed to provide the 60 dB of isolation required between the c...

Page 54: ...roblem exists In this step it is wise to check the obvious Doing so can save hours of troubleshooting time only to find out that a cable was bad or that it was some other relatively minor problem After identifying that a problem really does exist localization can usually be accomplished by merely observing the symptoms Isolating a problem down to the defective component will often involve the use ...

Page 55: ...END For PAL 500 DATA 63 54 27 18 510 DATA 45 36 9 0 2 Wrong Color Check Video Signal TP7 and Chroma level Waveforms 1 and 2 Adjust TV control 3 Ho Color Check Video Signal at TP6 PAL CVIDEO OUT of CN8 and Color Burst Signal Waveform 2 4 Random Character Clear Screen No Sign on Check RAS TP4 CAS TP5 Check pin 1 and pin 2 of IC15 Check pin 20 of IC2 Check IC16 19 Dynamic RAM Check the items in 6 4 P...

Page 56: ...yboard Entry Wrong Character Check Flex Cable and CN2 Check pin 23 CS2 of IC5 Check D8 Dll C18 19 22 23 and IC14 6 4 Processing Problem Check OSC Circuit Check TP2 and TP3 Waveform 7 Check TP4 and TP5 Waveforms 8 and 9 11 of IC6 WEO WE Check Address decod Check SO S2 Check pin 40 of IC5 18 of IC5 VSYNC of IC5 IRQ Check pin 40 of IC1 of IC1 NMI and p FIRQ these pin High 6 5 Cassette Problems IC6 EC...

Page 57: ...heck Resistors R15 R16 R17 and R66 and Diodes D6 and D7 6 7 Sound Problem Check TV volume Run the following program and check pin 1 of IC7 Waveform 13 Check Bias Voltage of Q4 C55 and C56 Check TP11 Check JK5 and pin 7 of CN3 10 SOUND 200 255 20 GOTO 10 6 8 Joystick Problem Run the following program and check if the numbers vary with joystick position or depressing fire button Check D8 Dll and Com...

Page 58: ...e of D3 D4 for AC Voltape w Note Check to Confirm the voltage of AC outlet is 120V 60Hz 1 Refer to Waveform 10 2 Refer to Waveform 12B 3 Refer to Waveform 12A 4 Refer to Waveform 11 Check Positive VoltaQA at INPUT ol IC36 Chaek Rippls at INPUT of IC 36 120Hz r Negative Replace IC36 kJ KJ Check AC Voltage at Cathode of Dl3 Replace D14 Replace C63 C62orD13isDead Replace these Parts 58 ...

Page 59: ...r of Q1 WJt icope determine frequency of AC Component HepPace fCS Replace Q1 Check AC Voltage at anodes of D1 and D2 w Check Vtc PIN of ach IC to determine if IC a k c essivsl y noisy use scope Replace despike capacitor or that chip 59 ...

Page 60: ... oJ Q1 Measure DCV across Riy Measure DCV at PfMI of ICS Replace qi Overcurrent Locate Replace Short Component Heplaca ice Replace these Diodes Check AC Voyage at Secondary of T1 Check AC Voltas at T1 primary Chech AC Cord and Replace 60 ...

Page 61: ...or AC Voltage W Check for BVDC at Output Of PC36 Replace C36 Check Positive Voltage at INPUT of IC40 Check Ripple at INPUT of IC40 IQOHz Note Check to Confirm the voltage of AC outlet is 240V 50Hz 1 Refer to Waveform 10 2 Refer to Waveform 12B 3 Refer to Waveform 12A 4 Refer to Waveform 11 Ch ck AC VoJm at Cathode of D13 Replace IC40 Replace D14 Replace C63 C62o Dl3iiDud Replace th e Parts 61 ...

Page 62: ... F19 MeaturB DCV 81 PIM1 of 1CS Replace Ql Overcurrent Locate rep Lace Short Component Feplace IC8 Check AC Vottege at anodes of D1 D2 o Check AC Voltage at Secondary of T1 Replace 5W1 Check AC Voltage at T1 primary Check AC Cord and Replace Rep lata Tl 62 ...

Page 63: ...ith scope detflrmina frequency ot AC Component Replace ICQ Replace Q1 Ft ec heck Chack Ac Voltage at anodes of D1 and D2 J Replace C29 Ctieck Vcc PIN Of each C to determine i f IC noisy MSB scope Reptace despike capacitor f or thai chip 63 ...

Page 64: ...al lOpsec DIV Trigger INTERNAL CH A Waveform 2 Color Burst Signal HSYNC CH A Color Burst Signal TP 7 0 5V DIV CH B HSYNC Pin 8 of CN3 2V DIV Horizontal 0 5usee DIV Trigger INTERNAL CH A Waveform 3 Rec HSYNC liBMKMB iSSBBBSBS CH A Red Signal of RGB TP 8 0 5V DIV CH B HSYNC Pin 8 of CN3 2V DIV Horizontal 10psec DIV Trigger INTERNAL CH B 64 ...

Page 65: ...Horizontal lOusec DIV Trigger INTERNAL CH B Waveform 5 Blue HSYNC Sfl y m CH A Blue Signal of RGB TP 10 0 5V DIV CH B HSYNC 2V DIV Horizontal lOpsec DIV Trigger INTERNAL CH B Waveform 6 VSYNC HSYNC CH A VSYNC Pin 9 of CN3 2V DIV CH B HSYNC 2V DIV Horizontal O lmsec DIV Trigger CH B INTERNAL 65 ...

Page 66: ...K CAS CH A ECLK TP 2 2V DIV CH B QCLK TP 3 2V DIV Horizontal 0 2tisec DIV Trigger INTERNAL CH A CH A ECLK TP 2 2V DIV CH B RAS TP 4 2V DIV Horizontal 0 2usec DIV Trigger INTERNAL CH A CH A ECLK TP 2 2V DIV CH B CAS TP 5 2V DIV Horizontal 0 2psec DIV Trigger INTERNAL CH A 66 ...

Page 67: ...ple Positive Cathode of Dl Negative Anode of D3 Hill HMOJiK tmwmMMMvwm CH A AC Ripple Cathode of Dl 0 5V DIV CH B AC Ripple Anode of D3 0 2V DIV Horizontal 5msec DIV Trigger INTERNAL CH A Waveform 12A AC Voltage at Cathode of D13 i i 1 mmm Wz SmmKM f L nJir Vertical 5V DIV Horizontal 5msec DIV Trigger INTERNAL 67 ...

Page 68: ... DIV Trigger INTERNAL Wave fo rm 13 SOUND OUT MM mm Im W CH A Pin 17 of IC7 1V DIV CH B Pin 1 of IC7 2V DIV Horizontal 0 5msec DIV Trigger INTERNAL CH A Waveform 14 Relay fPHi1 h Hi CH A Pin 9 of IC8 2V DIV CH B Pin 39 of IC4 2V DIV Horizontal lOmsec DIV Trigger INTERNAL CH A 68 ...

Page 69: ...NTSC Waveform 15 Bfl CH A Pin 12 of IC8 5V DIV CH B Pin 3 of IC4 2V DIV Horizontal 5msec DIV Trigger INTERNAL CH A 69 ...

Page 70: ...8 of CN3 2V DIV Horizontal lOpsec DIV Trigger INTERNAL CH A Waveform 2 Color Burst Signal HSYNC CH A Color Burst Signal TP 7 0 5V DIV CH B HSYNC Pin 8 of CN3 2V DIV Horizontal 0 5usec DIV Trigger INTERNAL CH A Waveform 3 Red HSYNC CH A Red Signal of RGB TP 8 0 5V DIV CH B HSYNC Pin 8 of CN3 2V DIV Horizontal lOusec DIV Trigger INTERNAL CH B 70 ...

Page 71: ...rigger INTERNAL CH B Waveform 5 Blue HSYNC i MM 9 IW 41 __ m m I m r I CH A Blue Signal of RGB TP 10 0 5V DIV CH B HSYNC 2V DIV Horizontal lOpsec DIV Trigger INTERNAL CH B Waveform 6 VSYNC HSYNC MBBBI H HI H CH A VSYNC Pin 9 of CN3 2V DIV CH B HSYNC 2V DIV Horizontal O lmsec DIV Trigger CH B INTERNAL 71 ...

Page 72: ...gger INTERNAL CH A Waveform 8 ECLK RAS CH A ECLK TP 2 2V DIV CH B RAS TP 4 2V DIV Horizontal 0 2usec DIV Trigger INTERNAL CH A Waveform 9 ECLK CAS 1 t l I JVjul rv MtMM T WwwJ t MM Itt T j j L Wi W W 1 CH A ECLK TP 2 2V DIV CH B CAS TP 5 2V DIV Horizontal 0 2psec DIV Trigger INTERNAL CH A 72 ...

Page 73: ... AC Ripple Positive Cathode of Dl Negative Anode of D3 CH A AC Ripple Cathode of Dl 0 5V DIV CH B AC Ripple Anode of D3 0 2V DIV Horizontal 5msec DIV Trigger INTERNAL CH A Waveform 12A AC Voltage at Cathode oJ D13 Nmmhhi PHHM1 H M uaimnmm HWEMHM11 Vertical 5V DIV Horizontal 5msec DIV Trigger INTERNAL 73 ...

Page 74: ...DIV Trigger INTERNAL Waveform 13 SOUND OUT mmiiUHBHllflJI IIHKH CH A Pin 17 of IC7 1V DIV CH B Pin 1 of IC7 2V DIV Horizontal 0 5msec DIV Trigger INTERNAL CH A Waveform 14 Relay CH A Pin 9 of IC8 2V DIV CH ft Pin 39 of IC4 2V DIV Horizontal lOmsec DIV Trigger INTERNAL CH A 74 ...

Page 75: ...PAL Waveform 15 CH A Pin 12 of IC8 5V DIV CH B Pin 3 of IC4 2V DIV Horizontal 5msec DIV Trigger INTERNAL CH A Waveform 16 Collector of Qll Horizontal 0 1 msec DIV Vertical 2V DIV Trigger INTERNAL 75 ...

Page 76: ... 76 ...

Page 77: ...SECTION VII 512K Expansion RAM Card PCB VIEWS 78 ELECTRICAL PARTS LIST 79 77 ...

Page 78: ...RAM CARD PCB VIEWS TOP VIEW BOTTOM VIEW 78 ...

Page 79: ...ytic IOOuF 16V 20 1 I C217 I Ceramic 27uF 50V 5 1 I CFQMK104JL or I CFSSLA01KQ I CFQMK104JL or I CFSSLA01KQ I CFQMK104JL or j CFSSLA01KQ j CGBUF333NT I CFQMK104JL or I CFSSLA01KQ I CEAAG107M I CCJBK270J j I I CONNECTORS CN4 6 Pin To Main PCB I 194113590A I ICs IC20 35 uPD41256C 15 N MOS Memory I I S1PD256 15 I I MISCELLANEOUS I Ref No Description 1 RAM Card PCB Ass y Socket IC 16 Pin or C8816 41 o...

Page 80: ... 80 ...

Page 81: ...SECTION VIII NTSC Version PCB VIEWS 82 ELECTRICAL PARTS LIST 84 EXPLODED VIEW PARTS LIST 90 EXPLODED VIEW 91 SEMICONDUCTOR INFORMATION 93 SCHEMATIC DIAGRAM 103 81 ...

Page 82: ...NTSC PCB VIEWS TOP VIEW HHBiPiBMnwnM hi win miWiwiJni iiihi ihiiihi 82 ...

Page 83: ...BOTTOM VIEW NTSC _iiiin 83 ...

Page 84: ...0 CC 182JJBM CQQMK182K or CQQMK182KL 1 1 C24 Elec NP LN lOpF 25V 20 CF 2408 CEPCU06M 1 C25 Ceramic 0 022pF 50V 80 20 CC 223JJBC CKJPK223Z 1 C26 M Plastic O lpF 50V 5 or CC 104JLBY CFQMK104JL or M Plastic O lpF 63V 10 or CFSSLAOIKQ or Ceramic O lpF 50V 80 20 CJRPK104ZM I C27 Electrolytic lOOpF 16V 20 CC 107MDCA CEACG107M 1 C28 M Plastic O lpF 50V 5 or CC 104JLBY CFQMK104JL or M Plastic O lpF 63V 10...

Page 85: ... 5 1 CCJVK270J f C67 Electrolytic lOuF 25V 20 1 CC 106MFBA CEACI106M 1 C68 Mylar 0 0 lpF 50V 10 1 CQQMK103K j 1 COIL 1 LI I Indue tor 1 8pH 1 CA 2159 1 142011310A l j CONNECTORS 1 CNl 1 PCB 40P Cartridge I AJ 7572 1 194210060A or 194210140A 1 CN2 Wire 16P Keyboard I AJ 7567 193910680A or 1 I 193911090A 1 CN3 Pin RGB 10P 1 AJ 5116 194112500A 1 CN4 6 Pin For I AM Option 1 AJ 7619 194010510A I CN7 Pi...

Page 86: ...45P or SIM S245P or HD74LS245P SIHDS245P I 1 IC4 MC68B21P PIA S elect N MOS or MX 7260 SIMC68B21 or 1 MB8874HM G or SIMB74HM G or HD68B21P SIHD68B21 1 I IC5 LSC81001P PIA S elect N MOS MX 7259 SILS81001P I 1 IC6 TCC1014 VC2645QC PLCC ACVC C MOS MX 7261 SICC1014 I 1 IC7 8050526 SC77526P B ipola DA Converter MX 6202 SISC50526 I 1 IC8 8050527 SC77527P Bipola Regulator MX 6201 SISC50527 1 1 IC9 SN74LS...

Page 87: ...Carbon R14 Carbon RI5 Carbon RI6 17 Carbon R18 Carbon R19 M Film R20 Carbon R21 Carbon R22 Carbon R23 Carbon R24 25 Not used R26 Carbon R27 Carbon R28 Carbon R29 Carbon R30 Carbon R3L Carbon R32 Carbon lOOkohm 1 4W 5X 4 7kohm 1 4W 5 47 ohm 1 4W 5 4 7kohm 1 4W 5 lOkohm 1 4W 5 100 ohm 1 2W 5 220 ohm 1 2W 5 270 ohm 1 2W 5 l Okohm 1 4W 5 510 ohm 1 4W 5 0 1 ohm 1W 5 5 1 ohm 1 4W 5 4 7kohm 1 4W 5 120 oh...

Page 88: ... 10 ohm 1 4W 5 N 0063EEC RCSQP100J j 1 R54 Carbon 1 Okohm 1 4W 5 N 0196EEC RCSQP102J 1 R55 Not used 1 R56 Carbon 2 Okohm 1 4W 4 5 RCSQP202J 1 R57 Carbon 120 ohm 1 4W 5 N 0136EEC RCSQF121J I j R58 Not Used 1 R59 Carbon 4 7kohm 1 4W 5 N 0247EEC RCSQP472J 1 I R60 Carbon 100 ohm 1 4W 5 N 0132EEC RCSQP101J 1 R61 62 Carbon 4 7kohm 1 4W 5 N 0247EEC RCSQP472J I R63 Carbon 150 Ohm 1 4W 5 N 0142EEC RCSQP151...

Page 89: ...r or 2SD 880Y 1 2SC 945P 1 MX 3293 2SC 945P 1 1 STKD880 Y or STKD880 G j ST2C945 P or STLC945 P STMS Al 3 j ST2C945 P or STLC945 P TRIMMER CAPACITOR I TCI 1 Capacitor F Adjust AC 0988 1 154010240A j 1 MISCELLANEOUS Ref No Description Cord Patch RCA RCA Box Switch TV Computer Socket IC for IC6 68 Pin PLCC Socket IC for IC16 19 18 Pin DIP RS Part No Mfr s Part No 313510H0A or 313510130A 189510030A o...

Page 90: ...I Plate Top 711010470A Net CA 851310440A j Holder For Net CA 413100810B 1 5 Screw 3x1 OP AHD 0088 HMP03010SN j 1 6 Grommet M 481110120A 1 7 Sheet Insulat ion AHC 0304 483011470A 1 8 Heat Sink For Q 1 471010310A 1 9 Nut Flange 3FN AHD 7020 HANF300 SY 1 10 PCB Unit Main U 32052 1 11 Knob For Power K 5012 655000940A 12 Modulator s MDV 8 AC 40 01 525010240A I 1 13 Knob For Reset AK 5638 659510850A I 1...

Page 91: ...EXPLODED VIEW oj rO 91 ...

Page 92: ...NTSC EXPLODED VIEW HTSC C J ro t Tt DN m CO 92 ...

Page 93: ...NDUCTOR INFORMATION IC1 MC68B09EP flt A1S la 7 aai r D ce INSTRUCTION REGISTER LE INTERHUPT CONTROL BUS CONTROL x T VCC JQ v Ss INTERNAL THREE STATE CONTROL BESET MM1 f IRQ IRQ LIC AVMA H W TSC HALT BA as BUSY 93 ...

Page 94: ...IC2 iiPD27C256D 20 GWD 10 9 OUTPUT ENABLE CIRCUIT CHIP ENABLE CIRCUIT V DECODER DATA OUTPUT 00 07 II 111211311511611 711 B 19 OUTPUT BUFFER IC3 SN74LS245N 24 2J 23 2_ 26 27 262 111 BITS MEMORY CELL r B 53 94 ...

Page 95: ...R IBIR OUTPUT BUS b CHIP SELECT and R W CONTROL OUTPUT REGISTER A ORA b OUTPUT REGISTER B ORB CONTROL REGISTER B CRB INTERRUPT STATUS CONTROL A 4CJCA1 CA2 2 DATA DIRECTtON REGISTER A DDRA 5 H PERIPHERAL INTERFACE A PERIPHERAL INTERFACE B 77 DATA DIRECTION REGISTER B DDRB INTERRUPT STATUS CONTROL B PAO PA1 PA2 PA3 PA4 PA5 PA6 PA7 PBO PB1 PB2 PB3 PB4 P85 PB6 PB7 is CB1 IS CB2 95 ...

Page 96: ...NTSC IC6 TCC1014 Z BUS S2 29 SO 31 CPU ADDRESS BUS 1 CPU DATA BUS HAMD OATA B4JS L RAMDQ RESET T 96 ...

Page 97: ...H a a W S dkl 111 SND ND ND ENABLE 1 II OAT A INPUT V CASS OUT jj COMP OUT T SOUND JUT IC8 8050527 E TTL INPUT FOB AS 233C I OUTPUT CASSETTE DATA I2EFO CROSSING j TTL INPUT k UNhEOUL i 4 V IhFuT JU SVQLT REGULATOR DP VEP von REG l TJ PA SSTHANSISTOP 6A5C DHlVF T PASS TflANSISTDP CURflENT SENSE I PECULATED 5 VOLTS IINTEftNAL TO SALT ONL Y T flS 3JC OUTPUT 3 TTL OUTPUTS 3 T TTL OUTPUT T RFLA DRiVF O...

Page 98: ...8N E l E 2 E 3 Vcc p nl6 4 5 6 GP4D Pin 8 9 j Tj 3 14 15 66 5 O4 63 2 0 IC10 12 SN74LS244N 1G 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4 2Y1 GND ferw 1 1 L C 10 T E fej 3a 20 19 18 16 15 14 12 Vcc 2G 1Y1 2A4 1Y2 2A3 1Y3 2A2 1Y4 2AI 98 ...

Page 99: ...74N NTSC CP MR DO CP CO ft vCC Pin20 GND Pin 10 Dl CP CD n Qo D 2 z D3 5 CP D CD D4 CP D CO Q2 D5 CP CO ft CP D CD n ig 4 D6 Q5 CP D CD n D 7 1 CP 4S Q6 0 IC14 SN74LS30N Vcc 14 1 3 12 1 1 10 9 E3 b i E 6 7 F GND 99 ...

Page 100: ... IC16 19 HM50464P 1 AofTa A 2 AS T A T A 5 7 S lQ RAS m HAS CLOCK GEN REF CONTROL ADOBESS COUNTEfl CAS CAS CLOCK GEN ADDRESS BUFFEHS S EL WHITE CLOCK GEN COLUMN DECODER 262 1446 IT MEMOflV CELL DATA IN BUFF DATA OUT BUFF a vi 3 cc GND 1 01 1 02 t 03 1 04 T OE 100 ...

Page 101: ...IC36 MC78L08ACP 1 OUTPUT 2 GND 3 INPUT NTSC n Q3 I QB tin c l 2K l 9K 1 3K 22K J l 1 ciH 6K 5 3 u I 3 Ql KTD880 Q2 Q3 Q5 Q7 2SC945 f sJ Q4 MPSA13 f l 101 ...

Page 102: ... 102 ...

Page 103: ...SCHEMATIC D 103 ...

Page 104: ...SCHEMATIC DIAGRAM NTSC Cat No 26 3334 104 ...

Page 105: ... 105 ...

Page 106: ... 106 ...

Page 107: ...SECTION IX PAL Version PCB VIEWS 108 ELECTRICAL PARTS LIST Ill EXPLODED VIEW PARTS LIST 119 EXPLODED VIEW 121 SEMICONDUCTOR INFORMATION 122 SCHEMATIC DIAGRAM 126 107 ...

Page 108: ...PCB VIEWS TOP VIEW 108 ...

Page 109: ...BOTTOM VIEW 109 ...

Page 110: ...PAL SUB PCB TOP VIEW 1 BOTTOM VIEW 110 ...

Page 111: ...ic 0 022pF 50V 80 20 I CKKPK223Z 1 C26 M Plastic 0 1 uF 50V 5X or I CFQMK104JL or M Plastic O lpF 63V 10 or I CFSSLA01KQ or Ceramic O lpF 50V 8O 2O I CJRPK104ZM I C27 Electrolytic lOOpF 16V 20 1 CEACG107M I C28 M Plastic 0 1 pF 50V 55S or I CFQMK104JL or M Plastic O lpF 63V 10 or 1 CFSSLA01KQ or Ceramic O lpF 50V 8O 2O 1 CJRPK104ZM j 1 C29 Electrolytic 4700pF 16V 20 1 CEACG478M 1 C30 M Plastic O l...

Page 112: ...Plastic O OlpF 50V 5 1 C109 111 I Electrolytic lOpF 16V 20 1 CI 12 I Mylar lOOOpF 50V 5 1 CI 13 1 16 I M Plastic O lpF 50V 5 or I M Plastic O lpF 63V 10 Cl 1 7 1 18 i Ceramic NPO lOOpF 50V 5 CI 19 I Mylar O OlpF 50V 5 or I M Plastic O OlpF 50V 5 C120 I Ceramic lOOOpF 50V 80 20 C121 I Ceramic NPO 30 P F 50V 5 C122 Not Used Cl 23 1 25 M Plastic O lpF 50V 5 or 1 M Plastic O lpF 63V 10 C126 I Not Used...

Page 113: ...1 CORES 7Pin FBI 2 I for Noise 142011510A 142011430A or or 194210060A 194210140A 1939I0680A 19391 1090A 194112500A 194010510A 194111250A 194011 120A 194112550A 194011 130A 194112560A or or FB3 4 Not Used FB5 10 for Noise 588010060A or 588010070A or 588010 130A 588010060A or 588010070A or 588010130A CRYSTALS XI 28 475MHz Clock OSC X101 4 433618MHz HC 18 U DIODES 1 Dly 2 I Silicon GP20B Rect if ier ...

Page 114: ... or 1 SIBM256 25 or I 1 TC57256D 20 or I SITC 0003 1 MBM27C256A 25CZG 1 SIBM256A25 I 1 IC3 SN74LS245N MB74LS245M M74LS245P HD74LS245P TTL BUS or or or I SIRNS245N or j SIMBS245M or j I SIM S245P or j I SIHDS245P 1 IC4 MC68B2LP MB8874HM G HD68B21P N MOS PIA or or I SIMC68B21 or I SIMB74HM G or I SIHD68B21 1 IC5 LSC81001P N MOS PIA Select 1 SILS81001P j I IC6 TCC1014 IC Socket C MOS 68Pin ACVC I SIC...

Page 115: ...r s Part No I I SIRNS30N or SIMBS30M or SIM S30P or SIHDS30P SIRNS04N or SIMBS04M or SIM S04P or SIHDS04P SIMB464 15 SIHM464 15 SIM 464 15 SIPD464 15 SIPD464 12 SITS464 I5 195110410A or 195110150A or 195110290A SIMCL08A or SINM78L08A or or or or or SIMC 0006 SIPC7812H SIMD4569B SIMD4568B SIMC1377P or JACKS Joystick Serial I O Cassette I O 2P Video Sound 193410040A 193410070A I93410O2OA 193410050A ...

Page 116: ... 1 RCSQP224J I R34 Carbon 100 ohm 1 4W b 1 I RCSQP101J j I R35 Carbon 220kohm 1 4W 5 1 I RCSQP224J 1 I R36 Carbon 1 Okohm 4W 5 I RCSQP102J I R37 Not Used 1 R38 Carbon 4 7kohm 1 4W 5 1 RCSQP472J 1 R39 Carbon 10 ohm 1W 5 I RCSQP100J 1 RAO Carbon l Okohm 4W 5 I RCSQP102J 1 R41 Not Used 1 R42 Carbon 3 9kohm L 4W 5 1 I RCSQP392J I R43 Carbon 43 ohm 4W 5 j RCSQP430J 1 R44 Carbon 82 ohm L 4W 5 1 j RCSQP8...

Page 117: ...8 Not Used R109 110 Carbon 1 Okohm 1 4W 5X Rill Not Used R112 Carbon 47kohm 1 4W 5 R113 114 Carbon 1 Okohm 1 4W 57 R115 Carbon 2 2kohm 1 4W 5 R116 117 Not Used RI18 Carbon 22 ohm 1 4W 5 Rl 19 Carbon 680 ohm 1 4W 5 R120 Carbon 1 Okohm 1 4W 5 R121 Carbon 470 ohm 1 4W 5X R122 Carbon 1 Okohm 1 4W 51 RS Part No Mfr s Part No RCSQP102J RCSQP201J RCSQP472J RCSQP100J RCSQP620J RCSQP821J RCSQP182J RCSQP471...

Page 118: ... Lator or STKD880 Y or STKD880 G 1 Q2 3 2SC1730 L NPN Amp ST2C1730 L 1 Q4 MPSA1 3 NPN Amp STMS A13 I 1 Q5 7 2SC 1730 L NPN Amp ST2C1730 L 1 Q8 10 Not Used 1 Qll 2SC536 H NPN ST2C536 H 1 Q101 2SC536 H NPN Amp 1 ST2C536 H I Q102 2SC1674 L NPN ST2C1674 L 1 Q103 2SC2786 LF NPN Amp ST2C2786LF 1 118 ...

Page 119: ...t Flange 3FN for Ql and IC40 HANF300 SY 1 10 PCB Unit Main j U 32055 1 1 11 Knob for Power j 655000940A 1 12 Modulator MDV 9 525010250A j 1 13 Knob for Reset 659510850A 1 14 Holder 411101870A 1 15 Holder 411103110A 1 16 Sheet Shield PAL IN 473311060A 1 17 Rivet PAL IN HARRA003SN j 18 AC Cord Ass y M 00765 Cord AC KP 560 7F 311010430A Socket Pin j 194011670A Crimp Pin j 194310190A 1 19 Holder 41110...

Page 120: ... 120 ...

Page 121: ...EXPLODED VIEW V 0HDntD hA 121 ...

Page 122: ...PLODED VIEW OJ Kl d io iO NOD cnmES 122 ...

Page 123: ...TAGE ABC COMPEN SATION THERMAL OVERLOAD PPOTECTlON 3 IC101 MC14569BCP CO 9 CFfT t PA1 DPA2 DPA3 DPA4 CTLa CTLb Dpbi Dps 2 DPB3 DpB4 fal 41 fBl fel mfTol liTI IJ51 IibI ISI 1 1 BINARY to JOHNSON ENCODER JLllillxi BCD BINARY HIGHSPEED JOHNSON COUNTER CLOCK PE t t i t 4 BIT BCD BINARY SYNCHRONOUS 8 Vdd PRESET ENABLE INCLUDING EARLY ZEflO DETECTION H p EOUT 123 ...

Page 124: ...377P uscpT GND 5 OSC BUFFER PAL NTSC CONtflOL LINE DRIVE LATCHING RAMP GEN J T RAMP QEN PHASE 8 2V ANGLE VCC OC _M_ N i l BURST PULSE RIVER 90 j BURST FLAG DUAL COMPARA TOR PAL SWITCH COLOR DIFFERENCE ANO LUMINANCE MATRIX SVNC AMI R Y J CLAMP OUT 3l t AWPL IF IF R CLAMP IE ET H R IN Q IN B IN LUMl lUMi 0U1 N J0 CHHCWA CL A JP r2i pv BCOMP OUT 3 124 ...

Page 125: ...Q2 Q3 Q5 Q7 2SC1730 f l E S Q11 Q101 2SC536 f l Q102 2SC1674 Q103 2SC2786 f l 125 ...

Page 126: ...SCHEMATIC DIAGRAM Cat No 26 3334 PAL ENCODER 2S5 gfc m r Of o oo x ui t n n UJ hi H H f o M n A z ul UJ 5 in in hi in a 1 III in _ i i m in n hi r o 1 i J N in in H 1 Z 126 ...

Page 127: ...SCHEMATIC DIAGRAM a C VIDEO foMO SOUND run y 1 r 127 ...

Page 128: ...CN2 r GX3 ABC E F QXZ OO NC GX3 n n o 3 GX3 OC3 v H w x LJEJ GX3 axzi GX3 Exa fNT LR I GX3 j G i 33 m GaXjS R SFT L EJHO SW1 AC1 0A POUER SW AC9 26 J C32 TO 0221 J C35 0 022 C31 220 16 D3 D4 1N4002 or SR1K 2 or 10E 1 r is s I rav ti m r C40 rei2 in I D13 D14 JJO 1N4Q02 0 SR1K 2 o 10E 1 240V 50Hz NOTES UALL RESISTANCE VALUES ARE INDICATED IN OHM K 103 OM M 10 B CHM3 12 ALL CAPACITANCE VALUES ARE IN...

Page 129: ...1 RADIO SHACK A Division of Tandy Corporation Fort Worth Texas 76102 Printed in Korea 811111870A ...

Search results

Summary of Contents for 26-3334

Reviews:

Related manuals for 26-3334

Brands by name

Popular brands

Tandy 26-3334, Service Manual

Search results

Summary of Contents for 26-3334

Reviews:

Related manuals for 26-3334

Brands by name

Popular brands