Sams 26-3134 User manual

CC15 08970
COMPUTER:
RADIO SHACK TRS-80 COLOR
COMPUTER 2
MODELS 26-3134, 26-3136-
TECHNICAL SERVICE DATA FOR YOUR COMPUTER

SAMSCOMPUTERFACTS' RADIO SHACK COLOR COMPUTER 2
MODELS 26-3134, 26-3136
PRELIMINARY SERVICE CHECKS
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This data provides the user with atime-saving service tool
which is designed for quick isolation and repair of Com-
puter malfunctions.
Check ail interconnecting cables for good connection and
correct hookup before making service checks.
Disconnect all peripherals except the Monitor from the
Computer to eliminate possible external malfunctions.
TEST EQUIPMENT AND TOOLS
TEST EQUIPMENT
Digital Volt/Ohm Meter
Logic Probe
Frequency Counter
TV Monitor
TOOLS
Low Wattage Soldering Iron
Desoldering Equipment
Contact Cleaner (non spray type)
Phillips Screwdriver
Flat Blade Screwdriver
IC Insertion and Removal Tools 14, 16, 24 and 40 pin
Alignment Tools GC Electronics 9440
REPLACEMENT PARTS AND DESCRIPTION
IDENT PART NO. DESCRIPTION
D3 DX2321 Diode, 30D1
D4 DX2321 Diode, 30D1
IC1 MX6201 IC, SC77527P
IC2 AMX4578 IC, MC6821P
IC3 MX6202 IC, SC77526P
IC5 AMX4227 IC, SN74LS273P
IC7 MX6211 IC, SC67331P
IC8 AMX4575 IC, MC6847P
IC9 MX5560 IC, MC6809EP
IC11 AMX4583 IC, SN74LS138N
IC13 MX6200 IC, 804236
A
IC14 MX6199 IC, RAM MB8118-12P
thru
IC21
IC22 MX6198 IC, 74LS783
Q1 2SD526 Transistor
R2 N0001EGE Resistor, .1 ohm, 1W
RY1 AR8166 Relay
SW1 AS2900 Switch, Power
T1 ATA1056 Transformer, Power
SAMS Howard W. Sams &Co.
4300 West 62nd Street, P.O. Box 7092, Indianapolis, Indiana 46206 U.S.A.
The listing of any available replacement part herein does not
constitute in any case arecommendation, warranty or guaranty by
Howard W. Sams &Co., Inc.. a5 to the quality and suitability of such
replacement part. The numbers of these parts have been compiled
from information furnished to Howard W. Sams &Co., Inc., by the
manufacturers of the particular type of replacement pari listed.
Reproduction or use, without express permission, of editorial or pictorial
content, in any manner, is prohibited. No patent liability is assumed with
respect to the use of the information contained herein.
%1986 Howard W. Sams &Co.
4300 West 62nd Street, P.O. Box 7092. Indianapolis, Indiana 46206 U.S.A.
Printed in U.S. of America. 86CC14969 DATE 4-86

PRELIMINARY SERVICE CHECKS (Continued)
CASSETTE
POWER RESET
(SA)e SOUND
RF MODULATOR
(3A)(4B)
CHANNEL 4
<S> CHANNEL 3
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INTERCONNECTING DIAGRAM
II
INTERCONNECTING DIAGRAM
VIS

PRELIMINARY SERVICE CHECKS (Continued)
SERVICE CHECKS
MATCH THE NUMBERS ON THE INTERCONNECTING DIAGRAM AND PHOTOS WITH
THE NUMBERS ON THE SERVICE CHECKS TO BE PERFORMED.
©
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COMPUTER DEAD
(A) Check for 17.5VAC between Connectors A1 and
A2. If the voltage is missing at Connectors A1
and A2, check Power Transformer (T1) for an
open winding. Also check for continuity be-
tween the center tap of the Power Transformer
secondary winding and Connector A3. Check for
an open power cord.
(B) If the voltage is correct at Connectors A1 and A2,
check for 5.0V at the 5.0V source. If 5.0V is miss-
ing, check Resistor R2, check for 5.2V at the
emitter of Transistor Q1. If the voltage is pres-
ent at the emitter of Q1, check Resistor R2.
(C) If the voltage is missing at the emitter of Q1,
check Transistor Q1 and IC1 .Also check Diodes
D3 and D4. Check Power Switch (SW1).
If all of the voltages are correct, refer to the
"Microprocessor Operation" section.
MICROPROCESSOR OPERATION
(A) Computer is dead. Check for pulses at pins 34
and 35 of the CPU IC (IC9). If pulses are missing,
check the SAM IC (IC22) by substitution.
(B) If pulses are present at pins 34 and 35 of IC9,
check for data pulses on pins 24 thru 31 of IC9
when the Computer is turned On. If there are no
data pulses present, check IC9 by substitution.
(C) If data pulses appear on pins 24 thru 31 of IC9
and then suddenly stop, check RAM ICs (IC14
thru IC21), ROM IC(IC12)and Expansion RAM IC
(IC13) by substitution.
VIDEO
(A) No video. Check the Video Display Generator IC
(IC8) and the RF Modulator by substitution.
(B) Dots are missing from alphanumeric characters.
Check (IC8) by substitution.
(C) Wrong characters appear on the screen. Check
Latch IC (IC5) and IC8 by substitution.
COLOR
(A) No color. Check for 3.579MHz at pin 7of SAM IC
(IC22). If the 3.579MHz signal is missing, check
1C22 by substitution.
(B) If the 3.579MHz signal is present at pin 7 of IC22,
check the RF Modulator by substitution.
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(C) Colors are not correct. Check for afrequency of
3.579MHz at pin 7of SAM IC (IC22). If the fre-
quency is not correct, check the adjustment of
Clock Trimer TC1, see "Miscellaneous Adjust-
ments". Also check IC22 by substitution.
SOUND
(A) No sound. Type in and run the following pro-
gram:
10 SOUND 200,200: GOTO 10
Check for pulses at pin 1of DAC IC (IC3). If the!
pulses are present, check the adjustment of the|
Sound Coil, see "Miscellaneous Adjustments"
(B) If pulses are not present at pin 1of IC3, check fori
pulses at pins 3thru 8of IC3. If the pulses are|
present, check IC3 by substitution.
(C) If the pulses are missing at pins 3thru 8of IC3,
check PIA IC (IC2) by substitution.
KEYBOARD
(A) Keyboard is dead. Check the keyboard Connec-
tor (CN2) for good connections.
(B) If the keyboard connector checks good, check
for pulses at pin 11 of Decoder IC (IC11). If
pulses are missing, check IC11 by substitution.
(C) If pulses are present at pin 11 of IC11, check PIAJ
IC (IC7) by substitution.
(D) Agroup of keys do not work. Check the
keyboard Connector (CN2) for good connec-
tions. Also check IC7 by substitution.
CASSETTE
(A) Cassette motor will not run or runs all the time.
Check Relay RY1 contacts between pins 1and 3
of Connector JK4. If the cassette motor will not
run, check for continuity between pins 1and 3
while saving aprogram on tape or loading apro-
gram from tape. If the cassette motor runs all of
the time, check for ashort (relay contacts stuck).
(B) If Relay RY1 checks good, check PIA IC (IC2) by
substitution.
(C) Programs cannot be saved on tape,
and DAC IC (IC3) by substitution.
Check IC2
(D) Programs cannot be loaded from tape.
IC2 and SALT IC (IC1) by substitution.
Check
III

PRELIMINARY SERVICE CHECKS (Continued)
@@@(7D)
CLOCK (4C)
TC1 ^-^
PINS 34 AMD 35
PULSES
!C3
PSMS 24 THRU 31
PULSES
PULSES 1
PIN 11
ICT1
PIN 7)(2A)
579MHz lp\
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PRELIMINARY SERVICE CHECKS (Continued)
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CLOCK (4C)
TC1 ^-^
PINS 34 AMD 35
PULSES
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PULSES
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PIN 11
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PRELIMINARY SERVICE CHECKS (Continued)
SERVICE CHECKS
(?) JOYSTICKS
Type in and run the
(A) Joystick does not work,
following program:
10 FORX =0TO3
20 Y=JQYSTK(X)
30 NEXT X: GOTO 10
While the program is running check for pulses at
pins 19 and 39 of PIA IC (IC7). If pulses are miss-
ing, check IC7 by substitution.
(B) if pulses are present at pins 19 and 39 of IC7,
check for pulses at pin 11 of Decoder IC <IC1 1). If __
the pulses are missing at pin 11 of IC11, check (9_)
IC11 by substitution.
(C) If pulses are present at pin 11 of IC11, check for
pulses at pins 4thru 9of PIA IC (IC2). If the
pulses are missing, check IC2 by substitution.
(D) If pulses are present at pins 4 thru 9of IC2,
check DAC IC (IC3) by substitution.
(E) Joystick buttons do not work. Check the
joystick buttons for continuity. Also check
joystick Connectors JK1 and JK2 for good con-
nections.
(F) If the joystick buttons and connectors are good,
check PIA IC (IC7) by substitution.
SERIAL I/O PORT
(A) Serial port does not work. Check PIA IC (IC2) and
SALT IC (IC1) by substitution.
POWER UP GENERAL OPERATING INSTRUCTIONS
CASSETTE OPERATION
The Computer will come up in Basic mode when turned On
with no cartridge in the slot. If acartridge is installed, the
Computer will come up running the program in the cartridge.
RESET
The Computer will be Reset by pressing the Reset button
(SW2) located on right rear of cabinet.
BASIC PROGRAMS
ABasic program in the Computer RAM can be started by typ-
ing RUN and then pressing the ENTER key. The program can
be stopped by pressing the BREAK key or the Reset button.
Connect acassette recorder to the Cassette Socket (JK4) on
the Computer using the cable furnished with the Computer.
Plug the black plug on the cable into the Earphone jack, the
large gray plug into the Auxiliary jack and the small gray plug
into the Remote On/Off jack on the Recorder.
To load aprogram from cassette, put the Recorder in Play
mode with the volume turned about half way up. Type
CLOAD and then press the Return key. The letter Swill ap-
pear on the Monitor screen while the Computer searches for
the program. When the Computer finds the program, the let-
ter Fwill appear on the screen and the word OK will appear
after the program has been loaded.
To save aprogram to cassette, put the Recorder in the
Record mode. Type CSAVE and then press the Return key.
The word OK will appear on the Monitor screen after the pro-
gram has been saved and the Recorder will shut Off.
DISASSEMBLY INSTRUCTIONS
CABINET REMOVAL
Remove sfx Phillips screws from cabinet bottom. Turn
Computer right side up and remove cover.
MAIN BOARD REMOVAL
board. Remove six Phillips screws holding Main board to
cabinet base and remove board. Remove shield from bot-
tom of Main board by removing 17 clips that attach it to the
board.
POWER TRANSFORMER REMOVAL
Carefully disconnect keyboard cable from Main board and Unplug Power Transformer from Main board. Remove two
remove Keyboard. Unplug Power Transformer from Main Phillips screws holding Power Transformer to cabinet base.
MISCELLANEOUS ADJUSTMENTS
CLOCK ADJUST
Connect the input of afrequency counter to pin 7of SAM IC
(IC22). Adjust the Clock Trimmer (TC1) for afrequency of
3.579545MHz.
RF MODULATOR
Connect Computer to aTV Monitor. Set the TV and the
Channel Select Switch (SW3) to Channel 4. Type in and run
the following program:
10 SOUND 200,200: GOTO10 t
Adjust the Channel 4Coil for best picture and sound. Ad-
just the sound coil for best sound with minimum noise. Set
the TV and the Channel Select Switch SW3 to Channel 3.
Adjust the Channel 3Trimmer for best picture and sound.
VI

PRELIMINARY SERVICE CHECKS (Continued)
CASSETTE
POWER RESET
(SA)e SOUND
RF MODULATOR
(3A)(4B)
CHANNEL 4
<S> CHANNEL 3
120MC
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INTERCONNECTING DIAGRAM
II
INTERCONNECTING DIAGRAM
VIS

PRELIMINARY SERVICE CHECKS (Continued)
PREVENTATIVE MAINTENANCE
ENVIRONMENT
Computers perform best in aclean, cool area that is below 80 degrees Fahrenheit and free of
dust and smoke particles. Even though home Computers are not affected by cigarette smoke
as much as commercial Computers are affected, it is better to maintain asmoke-free area
around the Computer. Do not block cabinet vents of any of the Computer system; Computer,
Monitor, Printer, or other power devices.
ELECTRICAL POWER
Variations in the line voltage can affect the Computer. Try to avoid these fluctuations by using
an AC receptacle that is on apower line not used by appliances or other heavy current demand
devices. Apower-surge protector, power-line conditioner, or non-interruptable power supply
may be needed to cure the problem. Do not switch power On and Off frequently.
KEYBOARD
Liquids spilled into the Keyboard can ruin it. Immediately after aspill occurs, disconnect the
Computer power plug from AC power outlet. Then, if circuitry or contacts are contaminated,
disassemble the Keyboard and carefully rinse the Keyboard printed circuit board with distilled
water and let it dry. Use acotton swab to clean between the keys. Use anon-abrasive contact
cleaner and lint-free wipers on accessible connectors and contacts.
DISK DRIVES
Clean the read/write heads of the Disk Drives about once amonth or after 100 hours usage.
Use only an approved head cleaning kit.
Handle carefully to preserve proper disk head alignment. Asudden bump or jolt to the Disk
Drives can knock the disk head out of alignment. If the disk drive must be transported, place
an old disk in slot and close door during transport.
Store disks in their protective covers and never touch the disk surface. Observe the disk
handling precautions usually found on the back of disk protective covers.
PRINTERS
Carefully vacuum the Printer regularly. Wipe surface areas clean using alight all-purpose
cleaner. Do not oil the machine. The oil will collect abrasive grit and dust. The dust will act as
ablanket. This can cause components to overheat and fail.
STATIC ELECTRICITY
Static electricity discharge can affect the Computer. In order to minimize the possibility, use
anti-static mats, sprays, tools and materials, and maintain good humidity in the Computer en-
vironment.
MONITOR
Use an isolation transformer with any Monitor that does not come as part of the system since
some Monitors use aHOT chassis (chassis connected to one side of the AC line). The face of
the Monitor should never be left on for long periods of time at high brightness level except
when pattern is being changed periodically. Use caution when cleaning anti-glare screens, to
preserve the glare-reduction feature.
Vtll

SAMSCOMPUTERFACTS" RADIO SHACK COLOR COMPUTER 2
MODELS 26-3134, 26-3136
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PRELIMINARY SERVICE CHECKS
ENCLOSED SAFETY PRECAUTIONS
See page 18.
INDEX
Page
Block Diagram 24
Disassembly Instructions 25
General Operating Instructions 25
GridTrace Location Guide 7
IC Pinouts and Terminal Guides 3,22
Line Definitions 17
Logic Chart 15,16
Miscellaneous Adjustments 25
Page
Parts List 11 thru 14
Photos 5, 6,19,20
Safety Precautions 18
Schematic 2,4,21
Schematic Notes 23
Test Equipment 8
Troubleshooting 8,9,10
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SAMS Howard W. Sams &Co.
im 4300 West 62nd Street, P.O. Box 7092, Indianapolis, Indiana 46206 U.S.A.
The listing of any available replacement part herein does not
constitute in any case a recommendation, warranty or guaranty by
Howard W. Sams &Co., Inc., as to the quality and suitability of such
replacement part. The numbers of these parts have been compiled
from information furnished to Howard W. Sams &Co.. inc., by the
manufacturers of the particular type of replacement part listed.
Reproduction or use, without express permission, of editorial or pictorial
content, in any manner, is prohibited. No patent liability is assumed with
respect to the use of the information contained herein.
©1986 Howard W. Sams &Co.
4300 West 62nd Street, P.O. Sox 7092, Indianapolis, Indiana46206 USA.
Printed in U.S. of America. 86CC14969 DATE 4-86

APHOTOFACT STANDARD NOTATION SCHEMATIC
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©Howard W. Sams &Co., Inc. 1886 RADIO SHACK COLOR COMPUTER
MODELS 26-3134, 26-3136

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GridTrace LOCATION GUIDE
A1 F-1 D10
A2 F-1 D11
A3 H-1 D12
CI M-4 D13
C2 1-4 FBI
C3 K-2 FB2
C4 K-3 FB3
C5 R-2 FB4
C6 R-3 FB5
C7 'F-3 IC1
C8 F-3 IC2
C9 H-3 IC3
CI 1D-20 IC4
C12 P-25 IC5
C13 0-12 !C6
C14 D-13 IC7
C15 D-14 IC8
C16 D-14 IC9
C17 D-14 IC10
C18 0-15 IC11
C19 N-12 IC12
C20 E-15 IC13
C21 F-1 1IC14
C22 D-13 IC15
C23 0-17 IC16
C24 0-1 1IC17
C25 F-1
5
IC18
C26 D-12 IC19
C27 F-1
2
IC20
C28 T-9 IC21
C29 T-6 1C22
C30 H-8 JK1
C32 H-6 JK2
C33 G-8 JK3
C34 K-19 JK4
C35 E-20 L1
C36 E-17 01
C37 S-14 02
C38 R-14 R1
C39 K-23 R2
C40 F-24 R3
C43 M-14 R4
C44 P-14 R5
C45 M-16 R6
C46 L-16 R7
C47 F-21 R8
C48 E-24 R9
C50 T-24 R10
C51 0-23 R1 1
C52 T-23 R13
C53 0-21 R14
C54 T-22 R15
C55 0-20 R16
C56 T-19 R17
C57 T-18 R18
C58 C-23 R19
C59 D-8 R20
C61 H-7 R21
C62 H-7 R22
C63 T-24 R23
C64 T-22 R24
C65 T-18 R25
C66 F-2 R26
CN1 H-26 R27
CN2 L-10 R28
D1 K-4 R29
D2 K-3 R30
D3 1-2 R31
D4 1-2 R32
D5 p-4 R33
D6 P-4 RY1
D7 E-15 SW1
D8 E-14 SW2
D9 D-18 SW3
D-22
D-24
D-23
C-10
G-2
G-3
N-18
L-15
S-14
0-3
0-19
0-12
E-11
G-11
G-14
0-6
E-9
G-22
0-19
L-19
G-19
G-17
R-25
0-23
R-23
0-22
R-2 2
0-20
R-20
R-19
0-16
B-12
B-14
B-17
B-19
1-6
M-2
C-8
0-1
0-1
D-16
0-17
D-22
E-11
R-5
0-11
E-8
E-12
D-13
1-7
D-21
0-14
R-11
0-22
D-21
K-24
D-23
L-19
D-23
D-16
0-14
G-11
0-14
R-4
R-11
0-15
D-16
E-12
R-17
R-17
0-19
D-1
B-22
B-9
TC1
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TEST EQUIPMENT
Test Equipment listed by Manufacturer illustrates typical or equivalent equipment used by SAMS' Engineers to obtain
measurements and is compatible with most types used by field service technicians.
TEST EQUIPMENT (COMPUTERFACTS)
Equipment Name B&KPrecision Equipment No,
Sencore
Equipment No. Simpson Equipment No.
OSCILLOSCOPE 1570A,1590A,1596 SC61 454
LOGIC PROBE DP51
LOGIC PULSER DP101
DIGITAL VOM 2830 DVM37,DVM56,SC61 463,467,470,474,467E
ANALOG VOM 277 260-7,160,165,
260-6XL.260-7P,
260-6XLP
ISOLATION TRANSFORMER TR110,1604,1653,1655 PR57
FREQUENCY COUNTER 1803,1805 FC71.SC61 710
COLOR BAR GENERATOR 1211A,1248,1251,1260 CG25.VA62 431
RGB GENERATOR 1260
FUNCTION GENERATOR 3020 420A.420D
HI-VOLTAGE PROBE
VOM/DMM
Accessory probes
HV-44 HP200 248
00168,00411,00749
TEMPERATURE PROBE TP-28 IR-10,00760,00758;
383,389,388
CRT ANALYZER 467,470 CR70
COMPUTER DEAD TROUBLESHOOTING
Disconnect all peripheral equipment from Computer except
the Monitor. Turn Computer On and check for proper opera-
tion. If Computer operates properly, turn Computer Off and
reconnect peripherals one at atime. Recheck the operation
of Computer each time aperipheral is connected until the
peripheral causing the problem is found.
If Computer does not operate properly with peripherals
disconnected, check for 5.0V at pin 3of SALT IC (IC1). If the
voltage is missing, refer to the "Power Supply" section of
this Troubleshooting guide. If the power supply voltage is
correct, check for pulses on Data lines (pins 24 thru 31) and
Address lines (pins 8thru 23) of CPU IC (IC9). If pulses are
missing at any of the pins, refer to the "Microprocessor
Operation" section of this Troubleshooting guide. If pulses
are present at all of the pins, refer to the "Video" section.
POWER SUPPLY
Computer is dead. Check for 5.0V at pin 3of SALT IC (IC1).
If the voltage at pin 3of IC1 is less than 4.75V, measure
voltage at collector of Voltage Regulator Transistor (Q1). If
Q1 collector voltage is at least 7.5V, measure the voltage
drop across Resistor R2. If the voltage across R2 is 0.2V or
greater, the power supply may be in the foldback (shut-
down) mode. Check Capacitors C5, C6 and C1 1for possible
shorts. Also check for other shorted components that may
be overloading the power supply. If the voltage across R2 is
approximately 1.0V, check Resistor R2 for an open condi-
tion. If the voltage across R2 is less than 0.2V, check Tran-
sistor Q1 and IC1.
If voltage at the collector of Q1 is less than 7.5V, check for
approximately 17.5VAC between the anodes of D3 and D4.
If the voltage is missing, check Power Switch (SW1). Also
check Power Transformer (T1) for apossible open winding.
If the 17.5VAC is present, check Diodes D3 and D4. Also
check Capacitors C2 and C3 and the printed circuit board
for possible shorts.
If 5.0V is present at pin 3of IC1, check for approximately
-10V at pin 15 of IC1. If -10V is missing, check Diodes D1
and D2 and Capacitor C1. If the voltages are normal at pins
3and 15 of IC1, use ascope to check for AC ripple at pin 3of
IC1. The AC ripple should be less than 0.4V peak-to-peak. If
excessive 60Hz ripple is present, check Diodes D3 and D4.
If excessive 120Hz ripple is present, check Capacitor C2. If
excessive 150-200Hz ripple is present, check Capacitors C5
and C11 and IC1.
MICROPROCESSOR OPERATION
Computer is dead, power supply checks good. Use ascope
to check the data lines (pins 24 thru 31 of IC9) for activity. If
there is no activity on the data lines, check the operation of
the reset circuit by observing the logic reading at pin 37 of
the CPU IC (IC9). Pin 37 of the CPU should beLow when the
Computer is turned On and then immediately go High. The
reading on pin 37 should also be Low whenever the Reset
Switch (SW2) is pressed. If the logic reading is not correct
at pin 37 of the CPU when the Computer is turned On, check
Capacitor C48, Diodes D10, D11 and D12 and Resistor R20.
If the Power On reset works properly but the Reset Switch
(SW2) does not work, check Switch SW2, Capacitor C58,
Resistor R22 and Diodes D11 and D12.
If the reset circuit is working properly, check for the
894.886KHZ Eand Qclock pulses at pins 34 and 35 of CPU
IC9. If the clock pulses are missing, check the waveform at
pin 6of the SAM (Synchronous Address Multiplexer) IC22.
If the waveform is missing at pin %, check Crystal X1,
Capacitors C43 and C44, Resistor R15 and Trimmer TC1. If
the waveform is present at pin 6of IC22, check for the Qand
Eclock pulses at pins 13 and 14 of IC22. If the clock pulses
are present at pins 13 and 14 of IC22, check IC22 and
Capacitors C37 and C38.
8

TROUBLESHOOTING (Continued)
If the Eand Qclock pulses are present at pins 34 and 35 of
CPU IC9, check for alogic High at pins 2, 3, 4and 40 of IC9.
In addition, pin 3(IRQ line) should have ashort, low-going,
60-Hz pulse on it. If the logic reading is not correct at any
pin, check the ICs and other components connected to the
pin having an incorrect reading. Also check the CPU IC9.
If any of the address or data lines are not generating valid
TTL logic levels, check the CPU IC9. If the CPU is good,
check the other devices on the address or the data bus for
possible shorts. If the address lines are functioning nor-
mally, there may be aprocessing problem due to a defective
device enable line. Check the ROM chip enable line (pin 20
of IC12)and the PIA chip enable line (pin 23 of IC7) for activi-
ty. If signals are absent on either of these lines, check the
SAM IC (IC22) by substitution. The SAM can also be check-
ed by observing lines 50 through 52 (pins 25, 26 and 27) for
activity with ascope. If the SAM is good, use ascope to
check Decoder IC (IC11) and NAND gate IC10 for proper in-
puts and outputs.
If pulses appear on the data lines (pins 24 through 31 of IC9)
when the Computer is turned On and then suddenly stop,
check the RAM ICs (IC14 thru IC21), ROM IC (IC12) and Ex-
pansion ROM IC (IC13).
VIDEO
No video. Check the waveform at pin 28 of the Video
Display Generator IC (ICS). If the waveform is present,
check for 5.0V at the junction of L1 and C62. If the voltage
is missing, check Choke L1 for an open condition. If L1 is
good, refer to the "Power Supply" section of this Trouble-
shooting Guide. If the waveform is missing at pin 28 of IC8,
check IC8. Also check Capacitor C59 for possible short to
ground.
If dots are missing from the alphanumeric characters,
check Video Display Generator IC (IC8). If the wrong
characters appear on the Monitor screen, check for pulses
at pins 2, 5, 6, 9, 12, 15, 16 and 19 of Latch IC5. If pulses are
missing at any of the pins, check IC5. If pulses are present
at IC5, check IC8.
VIDEO GRAPHICS
One or more of the graphics modes do not work. Type in
and run the following program:
10 FORX =0TO4
20 PMODEX: SCREEN X
30 NEXT X: GOTO 10
clock signal should have an amplitude of approximately
4.0V peak-to-peak. If the clock signal is missing at pin 33 of
IC8, check SAM IC (IC22).
If the 3.579MHz waveform is present at the junction of C61
and R13, check the Phase Aand Phase Bwaveforms at pins
10 and 11 of the Video Display Generator (IC8). If either
waveform is missing, check IC8. Also check the CH Bout-
put at pin 9of IC8. The CH Boutput should be asteady DC
value in the range of 0.5V to 2.0V. If the CH Boutput is
missing, check IC8. If IC8 is good, check for apossible bad
modulator that may be loading the chroma signals from IC8.
If color is missing in the high-resolution mode, check Timer
IC (IC4) and Switch Transistor (Q2).
Colors are not correct. Check the Phase Aand Phase B
signals at pins 10 and 11 of IC8. If either signal is missing
or incorrect, check IC8. Also check Timer IC4. Transistor
Q2 and associated components if the Phase Asignal is in-
correct. Incorrect colors may also be caused by adefective
modulator. If the color on the left side of the screen is adif-
ferent shade than the rest of the screen, check Timer IC4.
Also check Capacitor C26 and Resistor R10.
SOUND
No sound. Type in and run the following Basic program.
10 SOUND 200,200: GOTO 10
This program produces acontinuous sound from the Mon-
itor speaker. While the program is running, check for the
waveform in Figure 1at pin 1of DAC IC (IC3). If the
waveform is missing, check for pulses at pins 3thru 8of
IC3. If pulses are present at pins 3 thru 8of IC3, check IC3.
If pulses are missing at pins 3thru 8of IC3, check PIA IC
(IC2). If the output waveform is present at pin 1of IC3,
check the modulator. Also check for continuity between
pin 1of IC3 and the sound input of the modulator.
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This program continually switches between the five
graphics modes that are available. While the program is
running, check for pulses at pins 27, 29, 30 and 35 of Video
Display Generator IC (IC8). If pulses are missing, check the
PIA (IC2) and the SAM (IC22). If the pulses are present,
check IC22.
COLOR
No color. Check the 3.579MHz waveform at the junction of
C61 and R13. If the waveform is missing or has an
amplitude of less than lOOmV peak-to-peak, check Resistor
R13 and Capacitor C61. Also check for the 3.579MHz clock
signal at pin 33 of the Video Display Generator (IC8). The
KEYBOARD
Keyboard is dead. Check the Keyboard Connector (CN2) for
good connections. Also check for abroken flex cable be-
tween the Keyboard and the Main board. If the Keyboard
cable and Connector CN2 check good, check for pulses at
pin 11 of Decoder IC (IC11). If pulses are missing, check
IC11. If pulses are present at pin 11 of IC11, check PIA IC
(IC7). Also check Capacitors C15 and C18 on pin 4of the
joystick Connectors for possible shorts.

One key is erratic or dead. Replace the Keyboard. If agroup
of keys do not work, check the Keyboard and Keyboard
cable. Also check Connector CN2. The Keyboard and
Keyboard cable can be checked by referring to the
Keyboard matrix on the schematic diagram. Select the row
and column lines for an inoperative key and check for con-
tinuity between the two lines at Connector CN2 while press-
ing the key. If agroup of keys are inoperative, check the
row or common line common to the defective keys. If
Keyboard and cable are defective, replace the keyboard. If
the Keyboard and cable and Connector CN2 are good,
check PIA IC (IC7).
Wrong character appears on screen when Key is pressed.
Check the Keyboard for possible shorts. If the Keyboard is
good, check the Main board for apossible short.
SERIAL I/O PORT
Output missing at serial I/O port (Connector JK3). Discon-
nect any equipment connected to the serial I/O port. Type
in and run the following Basic program.
10 POKE 65312,2
20 POKE 65312,0
30 GOTO 10
Check for an approximately 40Hz square wave having a
minimum amplitude of 6volts peak-to-peak at pin 4 of Con-
nector JK3. If the 40Hz square wave is missing at pin 4of
JK3, check for the signal at pin 12 of SALT IC (IC1). If the
square wave is present at pin 12 of IC1, check Resistor R3
and Connector JK3. If the square wave is missing at pin 12
of IC1, check IC1. Also check PIA IC (IC2). If the negative
portion of the square wave is missing at pin 4of JK3, check
for approximately -10V at pin 15 of IC1. If the negative
voltage is missing at pin 15 of IC1, refer to the "Power Sup-
ply" section of this Troubleshooting Guide. If the negative
voltage is present at pin 15 of IC1 and the negative portibn
of the square wave is missing, replace IC1.
Serial input does not work. Ground pin 1of Connector JK3
and check for alogic High at pin 5of IC1. Next, connect pin
1of JK3 to the +5volt source and check for alogic Low at
pin 5of IC1. Pin 4of IC1 should go logic High when pin 2of
JK3 is connected to ground and pin 4of IC1 should go logic
Low when pin 2of JK3 is connected to the +5volt source.
If any of the above conditions are not met, check IC1. Also
check PIA IC(IC2).
CASSETTE
Cassette motor does not turn Off. Check for 0V at pin 39 of
PIA IC (IC2). If the voltage at pin 39 is not correct, check
IC2. If the voltage is correct at pin 39 of IC2, check for 5.0V
at pin 9of SALT IC (IC1). If the voltage is not correct at pin 9
of IC1, check IC1. If the voltage is correct at pin 9of IC1,
check Cassette Relay (RY1) for possible sticking contacts.
Cassette motor will not turn On. Type in and run the follow-
ing Basic program. This program turns On the cassette
motor.
10 POKE 65313,60
After running the program, check for 2.8V at PIA IC (IC2). If
the voltage is not correct at pin 39 of IC2, check IC2 by
substitution. If the voltage is correct at pin 39 of IC2, check
for .1V at pin 9of SALT IC (IC1). If the voltage is not correct
at pin 9of IC1, check IC1, Relay RY1 and Diode D9.
TROUBLESHOOTING (Continued)
Programs cannot be saved to cassette. Type in and run the
following basic program. This program continuously saves
itself to the cassette.
10 CSAVE: GOTO 10
While the program is running, use ascope to check for
pulses at pin 17 of DAC IC (IC3). If pulses are present,
check Connector JK4. If pulses are missing at pin 17 of IC3,
check for pulses at pins 5thru 9of PIA IC (IC2). If any
pulses are missing, check IC2. If pulses are present at pins
5thru 9of IC2, replace IC3.
Programs cannot be loaded from cassette, inject a4V peak-
to-peak 1kHz square wave at pin 4of Cassette Connector
JK4. Check for an approximately 1V peak-to-peak square
wave at pin 11 of SALT IC (IC1). If the waveform is missing,
check Connector JK4, Resistors R4 and R23, and Capacitor
C23. If the waveform is present at pin 11 of IC1, check for
an approximately 5V peak-to-peak square wave at pin 2of
PIA IC (IC2). If the waveform is missing at pin 2of IC2,
check IC3. If the waveform is present at pin 2of IC2, check
IC2.
JOYSTICK
Joysticks do not work. Type in and run the following Basic
program to check the operation of the joysticks.
10 FORX =0TO3
20N(X) =JOYSTK(X)
30 NEXT X
40 PRINT "RIGHT JOYSTICK HORIZONTAL ="; N(0)
50 PRINT "RIGHT JOYSTICK VERTICALS; N(1)
60 PRINT "LEFT JOYSTICK HORIZONTAL ="; N(2)
70 PRINT "LEFT JOYSTICK VERTICAL ="; N(3)
80 PRINT "RIGHT BUTTON ="; (PEEK(65280) AND1) .
90 PRINT "LEFT BUTTON ="; (PEEK(65280) AND2)
100 FOR T= 1TO 100: NEXT T:CLS: GOTO 10
The numbers that appear on the Monitor screen for the
joystick horizontal and vertical positions should vary from
to 63 while the joystick is being operated. The numbers that
appear for the joystick buttons should change to the
number whenever the button is pressed.
Check joystick Connectors JK1 and JK2 for good connec-
tions. While running the above program, check for pulses at
pins 19 and 39 of PIA IC (IC7). If pulses are missing at pin 19
or pin 39 of IC7, check IC7. If pulses are present at pins 19
and 39 of IC7, check for pulses at pin 10 of Decoder IC
(IC11). If pulses are missing at pin 10 of IC11, check IC11.
If pulses are present at pin 10 of IC11, check for pulses at
pins 4thru 9of PIA IC (IC2). If pulses are missing at pins 4
thru 9of IC2, check IC2. If pulses are present at pins 4thru
9of IC2, check IC3. Also check Capacitors C13, C14, C16
and C17 at the joystick connectors.
Joystick buttons do not work. If the right joystick button
does not work, check for alogic Low at pin 3of PIA IC (IC7)
while pressing the right joystick pushbutton. If the logic
reading is correct, check IC7. If the logic reading is not cor-
rect at pin 3of IC7, check Connector JK1 for good connec-
tions and check the right joystick button for continuity. If
the left joystick pushbutton does not work, check for alogic
Low at pin 2of IC7 while pressing the left joystick button. If
the reading is correct, check IC7. If the reading is not cor-
rect at pin 2of IC7, check Connector JK2 for good connec-
tions and check the left joystick button for continuity.
10

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