Challenger C4P User manual

fo r
COMPUTER BOARDS 502, 505, 527, 540 If 542
~s used in---------------------,
hallenger Series
MOOELC4P
MOOELC4PMF
&/1 'HWH"IJ/

TABLE OF CONTENTS
Adjustments
502 Board (C4P) ... . .. .. .. . . ...• . ....• ... . . ..... ••.....•.....•..... 48
505 Board (C4PMF)
..... ..•. ....•.. .. . . .. .. . • .. . ... . . ....... . . • . .. . 77
540 Board (C4P/C4PM F) ..... ...• .. ...•.....•.....• . .. . ..•. .. . . . .. . .43
Block Diagrams
Body
Block (C4P) .. . .. . ..... . .. .. ..... . .... . .. ... . .. . .. . • .. . .. ... 59,60
Body
Block (C4PM F) ............•.....•.....•. ....•.. ...•........ 63,64
Skeleton Block (C4P) . . ............ . . .. . .... .. .... . ... . •.. ..••....... 1
Skeleton Block (C4PM F) .. .... ..... . .. . .. .... .. . .. •..... • . ....••..... 2
Disassembly Instructions (C4P/C4PMF) . . ...............•.....•.....•...... 1
General Servicing/Safety Precautions (C4P/C4PMF) .. . .. . . ........... • . ...... 1
Legends
502 Board (C4P)
... .. .. .•.....•.....••....••.... .• . . ...•.....•..... 91
505 Board (C4PM F) ..... . .. .. • .. . . . •.....• •. . ..• .. ...••.. .• ... ..... 91
527 Board (C4PM F) .. .. . ... .••... .. .... . .... . .. . •........... . ...... 92
540 Board (C4P/C4PM F) . . ..... • .. . .. •.....••....•.....••........... 92
542 Board (C4P/C4PM F) ..... '. ' .••.. . . . •. .. . • •. . ...•... . . .. .. Rear Cover
Parts
List ....... . .. . ...... . . .••. .. ........ • ..... . .. .. . •.... . ... 14 thru 26
Photos
A15 Board (C4P)
.. ................. • . .. . . •. .. . .•... .. • ............. 62
A15 Board (C4PMF) ........ . .... .. .•. ....•..... . .. . .•. .. . .••.. . .. .. 78
Board - Chassis Layout (C4P) . .. .. . ..•• ....• . .. .. •. . ..••....• . ...... . .3
Board -Chassis Layout (C4PM
F) . .. ..• . .. . .• . ... .. ....•..... . .... .. ... 4
Chassis -Side View (C4P) .
... .. . ...• ....•• ....• ... . .•.. ........ . ... .48
Chassis -Side
View (C4PM F) ...... . .• .. .. .•.. . .. .. ... . .............. 83
502 Board (C4P) ....... ... . .. .. .....• . ...•....• .. .. . .. ...... 49,50,52,53
505 Board (C4PM
F) ..........•....••....•..... .....•... .. . .. 79,80,81,82
527 Board (C4PMF)
.... . .... . .. ...... .. ..•....•. .. .•......... .. . .89,90
540 Board (C4P/C4PMF) .
... .. .• ...... .. .. •.. . ... .. .•........ 44,45,46,47
542 Board (C4P/C4PMF)
.. .. .. •.....•....•.. . •. . .. .•.. ..•......... 27,28
Pinouts
502 Board (C4P) ........•....•.....•... . • ....•.....• .. . .•.... . . .... 51
505 Board (C4PMF) .........••. . . .•.. ..• .. .. .• .... ••.. .• • • . . ..... 65,66
527 Board (C4PM
F) ...... . ..•....... .........•.. .. •.....• . . .. .. .... 83
540 Board (C4P/C4PM
F) ....... •....•.....•. .. .•. . ...•. . ..••.. .... 32,33
542 Board (C4P/C4PMF)
.. . . .••.. .••. . . .•.....•.. ..• •....•.... . .. .. . 31
Schematics
A15 Board (C4P) ..... .. •. . .. .• . ... • .. .. .• . ........ . .. ..... . ... . .. .. 61
502 Board (C4P) . . .... .•.. ..• ... . ... .. ..•... .. . .. .. . .. . . .. .. 55,56,57,58
505 Board (C4PMF)
... . ..... •.....•.....•.... •... .67,68,69,70,73,74,75,76
527 Board (C4PMF)
.... . . .. •. . .. . .. .. . • ... .. • ........ ....... .84 thru 88
540 Board (C4P/C4PM
F) . ..• . . . . .• •.. . • •....•.. ..... .. . .. . .. .. 35 thru 41
542 Board (C4P/C4PM F) ... . . •... . .•.....• .... .• . .. . .• ............ 29,30
Schematic
Notes .... . .. .... . . . .•. ....•.... . •. . .. . •.... . .. ..... Rear Cover
Special Servicing Instructions
C4P .............. . . .. .. . . ..... • .. ...•.... . •. . ...•. . ...• . .. . .... .. 3
C4PMF . .
.. ..... ... . . .. . .• . .......... .. .... •..... • . .. ... •. .... . ... 4
Troubleshooting Guide
C4P .. .. .. . ... . .. . .......•.... . • . .. .. • . . ...• . .. . .• . .. . .•...... 5,6,7,8
C4PM
...... .. . .. _ ... . . •.. . ..•.... . •.... . •.... . •.....• .. . ... 9thru 13
Waveforms
502 Board (C4P) .
.......... • .. . .. •.....•.....•.....• .. . .. • . . .. .. ... 54
505 Board (C4PMF) .......•... . .•... . . •. . ...•.. .. ••. .. . .•. . . .. 71 , 72 , 77
540 Board (C4P/C4PM F) ...• ........... . ... . .. • .. . .. •... . .•.... 34 ,42,43
Copyrig ht (j) 19 80 by Howard W. Sarns & Co., Inc.
Indianapolis, Indiana 46206.
Pri nt ed in the Unite d States of America
•

LEGEND FOR 542 BOARD SCHEMATIC
AO , Al . ........ . .. ... .. . . ..... .Address
CO-C7 . ..... . ...... . ... . ...... .Column
KBE ..... . ........ . ... Keyboard Enable
KDO-KD7 .. . .. . ...... . ... Keyboard Data
NI .. . ...... .. . ...... . .... Noise Inhibit
NOISE 1 ... .. ....... . ...... . . .. .. Noise
NOISE 2 .. . ...... . ...... .. .. ... . .Noise
RESET . ..... .. . .. .. ..... .... . .... Reset
RO-R7 .. ... .. . .......... .. . .... . .. Row
SO-57 .. .. .. . ... . . ...... . ...... .Sound
1 R/W .. . .... . .... . .1nternal Read/Write
Any Bar above any alphabetical or
numeri cal combination indicates line
active in a low (0) state.
SCHEMATIC NOTES
__ Circuitry not used in some versions.
Circuitry used in some versions.
* Nominal value
+ Ground
rrln ChaSSIS
: Flame retardant resistor
9 See parts list
Item numbers in rectangles appear in the
atignment/adjustment instructions .
Supply voltage maintained as shown In input.
Voltages measured with digitat meter.
Terminal Identification may not be found on unit.
Resistors are '1.W or less. 5% u nless noted.
Value In ( ) used In some versions .

•
$15.95
IIIIIITIFII
1333 S. Chillicothe Road
Aurora, Ohio 44202

C4P/C4PMF - GENERAL SERVICING/SAFETY PRECAUTIONS
Use an isolation transformer for bench servic·
eing. Do not use a soldering device
which has cur·
rent flowing in its tip.
Maintain line voltage at 120VAC.
Remove power from unit before removing or in·
stalling chips.
Use an isolation (times 10) probe on scope.
Do not remove or install boards or minifloppy
with unit turned on.
Use extreme caution when handling printed cir·
cuit boards. Ground yourself before handling
.boards.
Install RAM in Chip Enable sequence only.
Caution: Ground path on the boards is parallel
to the B + path on the opposite side of the
board.
•
C4P/C4PMF - DISASSEMBLY INSTRUCTIONS
Lay unit on a protective surface with top side
down. Remove six screws from cabinet
bottom and
remove cabinet bottom. Remove ground lead
from cabinet bottom.
,
I
SYSTEM
BASIC
,
INTERNAL
,,
SYSTEM
PERIPHERAL
,
MONITOR LANCUAGE TRANSFER
...
TRANSfER
CASSETIE
'I ' A
'I ' • , C A
'I C •
MICRO
,
PROCESSOR
,
•
502 BOARD
----------------
... -------_ .. _---
............... _--
----------------_ .. _ ..
.. --
------------- --------------------------,
,
INTERNAl
,
.....!.
COlORJBW
VIDEO
VIDEO
TRANSfER ...
GENERATOR
MONITOR
, , ,
~
,
,
INTERNAl
, , At
At
TRANSfER
CONTROL
,
'I
540 BOARD
L. __ -
----------------------------------------~
.............. _-,
.. --
-----------------------------------------,
A15 BOARD'
542 BOARD:
..
, ,
POlLED
POLLED
AUDIO
,
AUDIO
INPUTS
KEYBOARD
CENERATOR
,
,
,
, 'I
.~
C , , ,
DIGITAL TO
,
ANalOG 'Ae
CONVERTER
,
,
•
,
•
----------~ ----------------------------------------------~
C4P - SKelETON BLOCK

,--------_._---_ .. _...... _---- .. _._---------_._-------------
50S BOARD
MICRO ·
SYSTEM
,-J
INTERNAL
0
INTERNAL
0
p
MONITOR
TRANSfER TRANSfER
~- ..... - ... -- .. -.---- ..
•
PART OF
0
A15 BOARD
, , A 'I
E 0
, ,
OS!
,
BU'
0 A
•
0 PERIPHERAL
0
PORT
TRANSfER
•
, A
PORT
B
0
INTERNAL
0
TRANSFER
L
RS232
UO
, ,
RS232
OUTPUT
•
•
_._ ........ _-_._- ... _-_ ..
•
flOPPY
0
• 0 0
•
TIMING
,----L FLO PPY
•
•
•
• 'I
• ,
•
• 0
PERIPHERAL
t-t-
•
• A
TRANSFER
•
•
•
... _---- .. _._._--
... ...
--- ... _------_ .. __ ............ -_._ ..... _---_ ...
. ... ...
r································· •
0
INTERNAL
t----L
SYSTEM
TRANSfER
MEMORY
, ,
'I
527
BOARD
...
_._-
---------- ... _------_ ......
_ ... __ ... __ ... _ ........ .1
r ... _
.... _------------------
-_._-----_.-----_ .. _--------_ .. _-
540 BOARD
~
COlOR/BW
INTERNAL
VIOEO
0
TRANSfER
0 0 MEMORY
GENERATOR
, , 0 ,
0
INTERNAL
0
At
TRANSFER
CONTROL
,
'I
.
-_ .. -
-.- ... ---.-----.---- .. - ... -------- .. -----.-.----.-.--.----~
.......... _-_._- . .,
•
._-
...-- .. --- ... ---.----.---.--- ... ----- ...... - ... -~
• • •
PART OF • •
542
•
• •
AUDIO
:
A15 BOARD
• •
BOARD
(POlUO)
A UOIO
• •
KEYBOARD
GENERATOR
:
• •
• • •
• • 0 01 •
• •
'I
•
o·
• •
POlUO
•
INPUTS
: : •
•
• • •
• • •
• • •
• •
DIGITAL
·
--------_ .. __ .•
--.t
• 0
TO
O AC
•
ANAlOG
• •
•
CONVERTER
•
• •
1 ___ -._---_ .... __ ... _ ... _._---_ .. _ .... _----------_ .............
C4PMF SKELETON BLOCK
2
V ID EO
MONITOR
AC

•
•
C4P SPECIAL SERVICING INSTRUCTIONS
For troubleshooting, the 502 and 540 boards can be interchanged for servicing.
NOTE: Care must be taken so that connectors on boards do not short to chassis or nearby boards.
542 BOARD 58 2 BOARD 5 40 BOARD
C4P - BOARD I CHASSIS LAYOUT
3

C4PMF SPECIAL SERVICING INSTRUCTIONS
For troubleshooting, the 505, 527, and 540 board can be interchanged for servicing.
NOTE: Care must be taken so that connectors on boards do not short to chassis or nearby boards.
542 BOARD 582 BOARD 540
D A 13 BOARD A 15 BOARD 527 BOARD 505 DUAI1U
C4PMF - BOARD / CHASSIS LAYOUT
4
•

•
C4P
TROUBLESHOOTING GUIDE
COLOR COORDINATED
See schematic for .the colors matching those in this guide for circuitry to be checked.
When a portion of a chip function is being referred to for checking, this is indicated by the partial col-
oring of chip.
PRELIMINARY SETUP
"SHIFT LOCK" key must be depressed before any troubleshooting is attempted.
"BREAK" key must be depressed and then released.
Confirm power supply output of 5V DC.
These steps are necessary before computer will operate.
~ ~O CLOCK INPUT - 502 BOARD
Input of scope to U12 , Pin 8. Output should be similar to WAVEFORM 35 .This confirms operation of
part of U12 .The I/Jo clock is developed on the 540 Board and feeds to U12 Pin 9, on the 502 Board. If
WAVEFORM 33 is missing at U12 Pin 9, it will be necessary to troubleshoot CPO clock source on the
540 Board.
/!! P2 CLOCK (OSC.) - 502 BOARD
Connect scope to U4 , Pin 39. Waveform should be similar to WAVEFORM 34 . This will check the
• operation of the clock section of U4.
,.
HH VIDEO SIGNALS - 540 BOARD
VIDEO OSCILLATOR CHECK: Connect scope to U3A, Pin 6. Waveform should be similar to
WAVEFORM
14 . To check operation of clock divider, connect scope to U3B, Pin 12 and Pin 9.
Waveform should be similar to WAVEFORM 13 and 15 respectively.
VIDEO COUNTERS
(U5D, U5B, U5F, U5H) CHECK: Timing and phase relationship of U5D , U5B, U5F,
U5H can be confirmed by use of a dual trace scope. For U5D use horizontal time base of .5J.1Sec . See
Figure 1 for scope connections to U5D . For U5B use horizontal time base of 10J.lSec . See Figure 1 for
scope connections to U5B. For U5F use horizontal time base of .2mSec. It may be necessary to use a
logic probe to see pulse at Pin 15. See Figure 1for scope connections to U5F. For U5H use horizontal
time base of 2mSec. See Figure 1 for scope connections to U5H.
Pin 14
Pin 13
Pin 12
Pin 11
Pin 15
Figure 1
5

CL CLOCK CHECK: Connect scope to U3C , Pin 4. Output should be similar to WAVEFORM 14.
END BLANK CHECK: Connect scope to U3C , Pin 7. Output should be similar to WAVEFORM 17 .
VIDEO ADDRESS DECODING CHECK: Check outputs of U5C, U5G, and U5E . See schematic for
scope connections. Outputs should be
similar to WAVEFORMS 7, 8,9, 17,22, 23 , 24 , 25 , 28 , 29 ,and 30 .
Check outputs of U5J and U5K. See schematic for scope connections. Outputs should be similar to
WAVEFORMS 23 , 24 , 25 , 28 , 29 ,and 30 .Timing and phase relationship of U5K and U51 can be confirm-
ed by use ofadual trace scope.Set scope horizontal time base to 2mSec. See Figure 2for scope connec-
tions and relationship of waveforms. This confirms operation of U5K, U51 , and associated circuitry.
USK , Pin 12
U5K , Pin 4
US I, Pin 4
US!, Pin 7
US!, Pin 9
USI , Pin 12
Figure 2
SYNC PULSE GENERATION - 540 BOARD
For horizontal sync, connect scope to Pin 12 of U4B. Output should be similar to WAVEFORM 26 and
the negative pulse should
be approximately 4.7!-,Sec wide.
For vertical sync connect scope
to Pin 12 of U4A. Output should be similar to WAVEFORM 27 and the
negative pulse should be approximately 300!-,Sec wide.
~ VIDEO MEMORY AND VIDEO DEVELOPMENT - 540 BOARD
The four memory chips U2C, U2D , U2E , and U2F are the B & W memory. U2C and U2F comprise
memory for the top half of the moni
tor display, while U2D and U2E comprise memory for the bottom
half of the monitor. The video information is fed thru U3F to ROM (U3E) to generate the dot pattern to
be displayed. U3D then shifts this information serially to the Video Monitor (J21) .See Figure 3 to com-
pare timing of memory switch signal to video signal. Set horizontal time base on scope to 2mSec. This
confirms operation
of U2C, U2D , U2E, U2F, U3D, part of U3E, U3F, and aSSOCiated circuitry.
U2C , Pin 8
Vi
deo Jack
U2D , Pin 8
Figure 3
• COLOR SIGNALS - 540 BOARD
To check X2 crystal oscillator (3 .579545MHz),connect scope to U2A Pin 8. Output should be similar to
WAVEFORM 11 . This confirms operation of part of U2A, X2, and associated circuitry.
6
•

NOTE: U1 B is used to generate the phase required to obtain the specific colors given in the
operators manual.
U1 B must be replaced by original type to obtain proper color.
• To check for
color from memory, connect a logic probe to U1 D, Pin 1. Enter machine language mode
by depressing "BREAK", "M\ ".", "0", "E\ "0\ "0". DEOO will appear in the left four positions of
the six located in the top left hand of the monitor. Depress "/" and "01 ". The logic probe should in-
dicate a low level. Enter "05", the logic probe should indicate a high level. Move logic probe to U1D,
Pin 2. The logic probe should indicate a train of pulses. Enter "01", the logic probe should now in·
dicate a low level. This confirms operati'on of part of U1 F, U1G, U1 E, U1 D, and associated circuitry.
Move logic probe
to U1A, Pin 5. The logic probe should indicate a low level. Enter "05". The logic
probe should indicate a train of pulses. This checks operation of part of U1A, U1D, and associated
circuitry.
•
To check timing pulses that select background color, connect scope to U4A, Pin 4. Output should be
similar to WAVEFORM 3 and the negative pulse should be approximately 8J<Sec wide.
• "BYTES FREE" MEMORY CHECK - 502 BOARD
The ram circuitry check is built into the computer, as long as most all other circuitry is working.
To check ram circuitry, follow this procedure:
1. Press "BREAK".
2. Press "C".
Computer will ask "memory size". Ignore the question, press "RETURN".
Computer will ask "terminal width". Ignore the question, press "RETURN".
Computer will display XXXX BYTES free, etc.
If the "BYTES FREE" number does not represent the total number of your system, this will indicate
what memory or associated circuitry has failed.
The following chart indicates the bytes free count and the chips inVOlved .
To find the defective memory rams or associated circuitry, observe bytes free indication on screen.
Go
to the chart and find the bytes free column to locate associated chips.
EXAMPLE
1: The computer is equipped with MEMORY totaling 7423 BYTES FREE.
The monitor screen indicates 5375 bytes free. Go to Chart 5375. Adjacent chips U35 and U44 are
operating properly. This would indicate, then, that U34 and/or U43 and/or associated circuitry is
malfunctioning.
EXAMPLE 2: The computer is equipped with MEMORY totaling 7423 BYTES FREE.
The
monitor screen indicates 4362 bytes free. Go to chart. 4362 falls between 4351 and 5375. This in-
dicates U35 and/or U44 and/or associated circuitry is malfunctioning.
NOTE: Chips adjacent to the next higher number of bytes free displayed on the monitor are the most
likely defective device(s).
If above steps do not solVf;l failure(s), continue.
:.: CHIP SELECT LINES CS(O thru 7) - 502 BOARD
To check chip select lines, bring the computer into machine language mode by depressing
"BREAK", then "M" . A six-character, alpha-numeric display will appear on the monitor. Use the first
four characters for the address code
as shown charted below. Connect logic probe to chip select
line.
Press"." then enter address selected from chart. If operating properly a pulse should be indicated
on logic probe when the last character is entered.
7

RAMS
BYTES FREE
CHIPS OR ASSOCIATED MACHINE ADDRESS
CIRCUITRY NUMBERS
255
U40 U49 0000-03FF
1279
U39 U48
0400-07FF
2303
U38 U47
0800-0BFF
3327
U37 U46
OCOO - OFFF
........ . . . . .... . . . . . .. . . _. . .. ....... . .. ... •. .. .. ... . .. . . . .. . . . . .. . .. ... . 4K
4351
5375
6399
7423
U36 U45
U35 U44
U34 U43
U33 U42
1000-13FF
1400 -17FF
1800-1BFF
1COO-1FFF
...... . .. . . .. ... . .. . ... . .. . . .. . .... . . .... . . ... .... ... . ... . . . . .. . . . .. . .. . .8K
• AUDIO CASSETTE/TAPE SIGNAL CHECK - 502 BOARD
502 BOARD
"
"
"
502 BOARD
"
"
"
Clock signal needed to send data to cassette/tape should be similar to WAVEFORMS 36 and 37 .
When storing a program going out to tape recorder, see WAVEFORMS 43, 44 , and 45.
To confirm signal coming from cassette: While loading a program coming from the cassette, proper
operation is indicated
by WAVEFORMS 38 , 39 , 40 , 41 , and 42. WAVEFORM 42 amplitude depends on
volume control setting of cassette.
• MICROPROCESSOR CHIP (CPU) OPERATION - 502 BOARD
If "BREAK" key does not clear screen of random pattern, processor may not be working. Be sure key
switch is functioning.
To verify processor is working, a pulse indication taken by scope (set on
1/LSec . range) or logic probe
at address lines
(AO through A15) at U4 will verify. No signal on an address line will suggest a defec-
ti ve U4 or a problem on that address line.
a ROM MONITOR AND ROM BASIC CHIPS OPERATION CHECK - 502 BOARD
SYMPTOM: "BASIC" mode will not operate as "C " key is depressed and display does not change.
"MACHINE" mode operates properly. This indicates a problem with ROM BASIC 1(U6) , 2(U7) and/or
3(U8).
SYMPTOM: "BASIC" AND "MACHINE" modes not functioning. This indicates a problem with one or
more of these chips and/or associated circuitry:
ROM MONITOR (U5) , ROM BASIC 4 (U9) , MICROPROCESSOR (CPU-U4), RAMS (U40 AND/OR U49 )
8
•

•
•
•
C4PMF
TROUBLESHOOTING GUIDE
COLOR COOROINATEO
See schematic for the colors matching those in this guide for circuitry to be checked.
When a portion of a chip function is being referred
to forchecking,this is indicated by the partial col-
oring of chip.
PRELIMINARY SETUP
"SHIFT LOCK" key must be depressed before any troubleshooting is attempted.
"BREAK" key must be depressed and then released.
Confirm power supplies output of 5V DC.
These steps are necessary before computer will operate.
~ CRYSTAL OSCILLATOR (X1) - 505 BOARD
Connect scope to U5C, Pin 8. Waveform should be similer to WAVEFORM 38. This confirms opera-
tion of
X1 and associated circuitry.
02 CLOCK (OSC.) - 505 BOARD
Connect scope to U1B , Pin 39. Waveform should be similar to WAVEFORM 41 . This will check the
operation of the
clock section of U1 B. Check the outputs of U4D Pin 3 and 13 . Waveform should be
similar to WAVEFORM 42 .
VIDEO SIGNALS - 540 BOARD
VIDEO OSCILLATOR CHECK: Connect scope to U3A, Pin 6. Waveform should be similar to
WAVEFORM 14 . To check operation of clock divider, connect scope to U3B, Pin 12 and Pin 9.
Waveform should
be similar to WAVEFORM 13 and 15 respectively.
VIDEO COUNTERS
(U5D , U5B, U5F, U5H) CHECK: Timing and phase relationship of U5D, U5B , U5F,
U5H can be confirmed by use of a dual trace scope. For U5D use horizontal time base of .5JlSec. See
Figure 1 for scope connections to U5D . For U5B use horizontal time base of 10JlSec. See Figure 1 for
scope connections
to U5B. For U5F use horizontal time base of .2mSec. It may be necessary to use a
logic probe to see pulse at Pin 15 . See Figure 1for scope connections to U5F. For U5H use horizontal
time base of 2mSec. See Figure 1 for scope connections to U5H.
Pin 14
Pin 13
Pin 12
Pin 11
Pin 15
Figure 1
9

CL CLOCK CHECK: Connect scope to U3C , Pin 4. Output should be similar to WAVEFORM 14.
END BLANK CHECK: Connect scope to U3C , Pin 7. Output should be similar to WAVEFORM 17 .
VIDEO ADDRESS DECODING CHECK: Check outputs of U5C , U5G , and U5E. See schematic for
scope connections. Outputs should be
similar to WAVEFORMS 7, 8, 9, 17 , 22 , 23 , 24 , 25 , 28 , 29 ,and 30 .
Check outputs of
U5J and U5K. See schematic for scope connections. Outputs should be similar to
WAVEFORMS 23, 24 , 25, 28 , 29 ,and 30 .Timing and phase relationship of U5K and U51 can be confirm-
ed by use of a dual trace scope.Set scope horizontal time base to 2m Sec. See Figure 2for scope connec-
tions and relationship of waveforms. This c onfirms operation of U5K, U51 , and associated circuitry.
U5K , Pin 12
U5K , Pin 4
U5!. Pin 4
U5!. Pin 7
U5!. Pin 9
U51 , Pin 12
SYNC PULSE GENERATION - 540 BOARD
•
For horizontal sync, connect scope to Pin 12 of U4B . Output should be similar to WAVEFORM 26 and •
the negative pulse should be approximately 4. 7"Sec wide.
For vertical sync connect scope
to Pin 12 of U4A.Output should be similar to WAVEFORM 27 and the
negative pulse should be approximately 300"Sec wide.
~ VIDEO MEMORY AND VIDEO DEVELOPMENT - 540 BOARD
The four memory chips U2C , U2D, U2E , and U2F are the B & W memory. U2C and U2F comprise
memory for the top half of the monitor display, while
U2D and U2E comprise memory for the bottom
half of the monito r. The video information is fed Ihru U3F to ROM (U3E) to generate the dot pattern to
be displayed. U3D then shifts this information serially to the Video Monitor (J21). See Figure 310 com-
pare timing of memory switch signal to video signal. Set horizontal time base on scope to 2mSec.This
confirms operation
of U2C, U2D, U2E, U2F, U3D , part of U3E , U3F, and associated circuitry.
U2C , Pin 8
Video Jock
U2D , Pin 8
Figure 3
• COLOR SIGNALS - 540 BOARO
To check X2 crystal oscillator (3 .579545MHz),connect scope to U2A Pin 8. Output should be similar to
WAVEFORM 11 . This confirms operation of part of U2A, X2, and associated circuitry.
10 •

•
•
NOTE: U1 B is used to generate the phase required to obtain the specific colors given in the
operators manual.
U1 B must be replaced by original type to obtain proper color.
To check for color from memory, connect a logic probe to U1 D, Pin 1. Enter machine language mode
by depressing "BREAK",
"M" , "." , "D", "E" , "0" , "0" . DEOO will appear in the left four positions of
the six located in the
top left hand of the monitor. Depress "/" and " 01 ". The logic probe should in-
dicate a low level. Enter "05", the logic probe should indicate a high level. Move logic probe to U1 D,
Pin
2. The logic probe should indicate a train of pulses. Enter " 01 ", the logic probe should now in-
dicate a low level. This confirms operation of part of U1F, U1G, U1E, U1D, and associated circuitry.
Move logic probe
to U1A, Pin 5. The logic probe should indicate a low level. Enter " 05 ". The logic
probe should indicate a train of pulses. This checks operation
of part of U1A, U1D, and associated
circuitry.
To check timing pulses that select background color, connect scope to U4A, Pin 4. Output should be
similar to WAVEFORM 3 and the negative pulse should be approximately 8f.1Sec wide.
:-: CHIP SELECT LINES CE (0 thru 23) - 527 BOARD
To check chip select lines, bring the computer into machine language mode by depressing
"BREAK", then "M". A six·character alpha-numeric display will appear on the monitor . Use the first
four characters for the address code as shown charted below. Connect logic probe to chip select
li ne .
Press "." then enter address selected from chart. If operating properly a pulse should be indicated
on logic probe when the last character is entered.
Of )
"1rFF -
r; () 'i~ 1
RAMS
CHIPS OR ASSOCIATED
CIRCUITRY
MACHINE ADDRESS
NUMBERS
UA1 , UB1 0000·03FF
UA2, UB2 0400-07FF
UA3, UB3 0800-0BFF
UA4, UB4 OCOO - OFFF
... .. ....•. ... • .. . .. .. ...... .. . .. . .. . ... .... ...... . .. . ......... .... .. . . .. 4K
UA5, UB5
UA6, UB6
UA7 , UB7
UA8, UB8
1000·13FF
1400-17FF
1800·1BFF
1COO·1FFF
... .........•... . .................... .. . . . . ......... ... ..... . .. . . ..... .. .8K
UC1, UD1
UC2 , UD2
UC3, UD3
UC4 , UD4
II ·HY
2 9Q 0-23FF
2400-27FF
2800·2BFF
2COO-2FFF
(l
('> 0 I\.:: \ I Q 0
~
.... ... .. ... .. .. .. . . . . . ... . .. .. .. .. .... .. .. . . .... . . .. . .. . . . . .. .. .. .. .... 12K
UC5, UD5
UC6, UD6
UC7 , UD7
UC8, UD8
3000·33FF
3400·37FF
3800-3BFF
I j~ 0 3COO·3FFF Oo I I
\ '<
.. ..•... . ....• . .. . .• .. . ..• ... .. • .. . . . . .. . .. .. . .. . .. . . . . . .. . .. . . . . . . . . .. . 16K
_ ., c. \
IS-' '1'; 'I
11

UE1, UF1
UE2, UF2
UE3, UF3
UE4, UF4
4000-43FF
4400-47FF
4800-4BFF
1"1 LIS" C. _ ~4FFF
o r o n
. . ... ...•...... ...•... . .. .. ..... . ........•.. . ........ . .. . .. . ............ 20K
UE5, UF5
UE6, UF6
UE7, UF7
UE8, UF8
5000-53FF
5400-57FF
5800-5BFF
"21,')'71-- 5COO-5FFF
----
. .......... ...... .•.. . . .. .. . ....... . ................ . ................... 24K
• MINIFLOPPY DATA-PATH CHECK - 505 BOARD
Connect scope to U5G , Pin 7 to check count down circuit operation. Output should be similar to
WAVEFORM 57.
Connect scope to U3C Pin 4. Output should be similar to WAVEFORM 47 and the negative pulse
should be approximately 400nSec. Connect scope to U3C Pin 5. Output should be similar to
WAVEFORM 46 and the positive pulse should be approximately 400nSec. This checks the timing
pulse needed to send the write data to the minifloppy .
•
Connect scope to J2 Pin 9. Output should be similar to WAVEFORM 51. When data is being sent to •
the minifloppy, it will appearas noise on the waveform. This confirms operation of parts of U1C, U4B,
U5D, and U2B.
To check data input, connect scope to U4C Pin 12 . Insert minifloppy disk. Output should appear
similar to WAVEFORM 45 .
To check clock input, connect scope to U4C Pin 13. Insert minifloppy disk. Output should appear
similar to WAVEFORM 44.
MINIFLOPPY CONTROL SIGNAL CHECK - 505 BOARD
Connect scope to J2, Pin 17. Output should be similar to WAVEFORM 58.
Connect logic probe to J2, Pin 19. With Disk removed the logic probe will indicate a logic 1. While
Disk is being inserted into Minifloppy, the logic probe will indicate a logic O. After the Disk is in-
serted a logic 0 will remain if the Write Protect notch is covered; a logic 1 will be displayed if the
notch is not covered.
Depress "BREAK", check for a pulse on a logic probe connected to J2, Pins 7, 8, and 21, just after
depressing "D".
Depress "BREAK", check for pulses on a logic probe connected to J2, Pins 2 and 5. Check fora pulse
on J2, Pins 3 and 18 after "BREAK" is depressed. Then check for two pulses after "D" is depressed.
Connect logic probe to J2, Pin 1. Depress "BREAK". Check for several pulses after" D" is depressed. •
Pin 1 should then become HI-Z. Connect logic probe to J2, Pin 6. Depress "BREAK" and confirm a
logic 1. Depress "D" check for several pulses then a logic O. This checks the operation of part of U1A
and associated circuitry.
12

•
•
•
• MICROPROCESSOR CHIP (CPU) OPERATION - 505 BOARD
If "BREAK" key does not clear screen of random pattern, processor may not be working. Be sure key
switch is functioning.
To verify processor is working, a pulse indication taken by scope (set on 1/lSec range) or logic probe
at address lines
(AD thru A 15) at U1 B will verify. No signal on an address line will suggest a defective
U1 B or a problem on that address line.
Ie ROM MONITOR OPERATION CHECK - 505 BOARD
SYMPTOM: "DISK" mode will not operate as "D" key is depressed. The "MACHINE" mode operates
properly. This indicates a problem with one or more of these chips and/or associated circuitry;
ROM MONITOR (U2D), MICROPROCESSOR (CPU· U1B) , RAMS (UA1 AND/OR UB1)
0 10I
00 00(1000r()
13

C4P/C4PMF- A15 BOARD PARTS LIST AND DESCRIPTION
(When orderong pgrh, dole Model, Pori Number, ond DeHrrpr;onJ
SEMICONDUCTORS (Select replacement transistor for best results) •
REPLACEMENT DATA
ITEM TYPE
MfGR .
GENERAL
ZENITH
No , N~ PART No.
ELECT RIC
MAllORY RAYTHEON RCA SYLVANIA
THOROARSON
WORKMAN
PA RT No.
PART No. PART No.
PART No.
PART No.
PART No. PART No. PART No.
01-04 lN914
Q-1H914
GE-514 PTC214 REN 177 SK3100/519
[CG519 T14519
WEP9Z5/519
103-131
ELECTROLYTIC CAPACITORS
REPLACEMENT DATA
ITEM
RATING
MFGR . CORNEll·
MALLORY
SPRAGUE PART No.
No .
PART No.
OU81L1ER
PART No. I
GENERAL
PART No. G-lINE
LINE
CI 47
l6'
(-506 NLWSO-16 TTl5X5OA
QE1-JSl I
TVA-1l50
CAPACITORS
REPLACEMENT DATA
ITEM
RATING
MFGR . CORNEll·
SPRAGUE
PART No.
No ,
MALLORY
PART No.
DU81l1ER
PART No .
PART No.
Q·L1HE
I GENERAL LINE
C2
,1
10'
C8-10410 49. I'IAG1201 QCl-ZZJ l
HY-360
RESISTORS ( Power ond Specia l)
REPLACEMENT DATA
REPLACEMENT DATA
ITEM
RATING
WORKMAN
ITEM
RATING
MFGR.
WORKMAN
No,
MFGR.
No ,
PART No.
PART No.
PART No. PART No.
R1 220 S% 1/4'11
Rl-221 22-1080
R5 220 51 1/4'11
Rl - 221
22-1080
Flameproof Carbon Flameproof
Carbon
Film Film
R2
4700 SI 1/4W
RI-472 22-1112
R6
4700 5i 1/4'11 Rl-472 22-1112
Fl ameproof Carbon
Flameproof Carbon
Film Film
Rl
220 51 1/4W
RI-221
22-1080 R7 220 5" 1/4W
RI - 221 22-1080
Flameproof
Carbon
Flameproof Carbon
FUm
Film
..
4700 S" 1/4W
Rl-472 22-1112
,.
4700 5% 1/4'11
Rl -4 72 22-1112
Fl ameproof Carbon Flameproof Carbon
FUm
Fflm
•
"
1000 51 1/411 RI-I02 22-1096
Flameproof
Carbon
Film
MISCELLANEOUS
ITEM
PART NAME PART No.
NOTES
No,
J1
Socket SC-40Fl
40 Pin (Interconnect to 502 Board)
J2 Socket
SC·16FW
16 Pin tSI ItO BUS)
JJ Socket
SC ·16FWW
16 Pin Port -A")
J4 Socket
SC-16fWW
16 Pin Port -6")
J'
Socket
SC-9FA
9 Pin (Joystick "A"!
J'
Socket
SC- 9FA
9 Pin (Joystick "8"
J7
Socket
SC-9FA
9 Pin (Key Pad "A")
J8 Socket
SC·2SFCA
25 Pin (Printer)
J.
Socket
SC-25FCA
25 Pin (Modem)
J1.
Socket
SC·9FA
9 Pin (Key Pad ·B~)
P.C. Board
PC-AI SA
C4-P Connector
C4P- 502 BOARD PARTS LIST AND DESCRIPTION
(When ordering pattt, tlale Madel, ParI Number, and DucflptionJ
SEMICONDUCTORS (Select replacement Iransistor for best results)
REPLACEMENT DATA
ITEM
TYPE
MFGR .
GENERAL
No,
No,
PART No.
ElECTRIC
MALLORY RAYTHEON
RCA SYLVANIA
THORDARSON
WORKMAN
ZENITH
PART No.
PART No. PART No. PART No.
PART No.
PART No .
PART No. PART No.
01-02
IH914
Q-IH914 !L-514
PTC214 REN 177 SK3100/519 ECGSI9
TH519 IIEP925/519
103-131
03-OS
U1 F-7476PC
IC-7476
GE · 7476
SK7476 ECG7476
1117476 IIEP7476!7476
U2 CA3130E
IC-3130
UJ
1'1;685(11
IC-6850
1J4 6502
IC-65 02
us C3808S lC-7157 •
SYttlCflVl.0
LO C38121
It-BAS JC 1
U7
C38122 It-BASIC 2
lIS
C38123 IC-8ASIC 3
"'
C38124
IC-BASIC 4
14

C4P- 502 BOARD PARTS LIST AND DESCRIPTION (CONTINUED)
(When ordering porls, IIafe Model, Port Number, and DflJcriplionJ
• SEMICONDUCTORS (Selec. replacemen. 'ran.i,'or for be •• re.ulls) (cont)
REPLACEMENT DATA
ITEM TYPE MFGR .
GENERAL
ZENITH
No. No . PART No .
EtEaRle
MALLORY
RAYTHEON RCA
SYlVANIA
THORCARSON
WORKMAN
PART No.
PART No . PART No . PART No . PART No .
PART No .
PART No . PAR T No.
UIO NBT26AN
l e-8ll6
U12
F-5404DH
7404
IC-7404
GE-74Q4
SK7404
[CG 7 404
TM7404
22 1-Z9 016
U13
U A555T C IC-555
GEIC - 269 PTC1S 55
SK3564 / 955M
ECG955H
TH955M
WEP2119 / 95511
221-19042
Ul4
74148N
IC- 74148
U16
74lS139N
l C- 74 l S139
U17 F-S404OM
7404
IC-1404
GE-7404
510404
ECG7404
TM7404
UIS F-743OPC
IC-7430
5K7430
ECG7430
TI1743 0
22 1-19076
U19 N8TZ6AH
IC-aTl6
020
7<0' IC- 7404
GE-7404
SK7404
[CG7404
1H7404
22 1-Z 9076
U22
SN74123N It-74123 !iE-l4123
REN 74123
5104 12 3
ECG74123
TM74123
U23 F-7474PC
IC -7 474
GE -7474
221 - Z9006
R[N 7474
SI(7474
[CG7474
H!7474
W[P7474 /7 474
U24
F-7417Pt:
IC-7417
ECG7417
TH1417
U2'
F- 7 417Pt:
IC - 7417
ECG7411
Tl'!7417
U2.
SN7 4l S138N
IC-74LS138
SI(74LSl18
ECG74LSl38
TM74LS138
U27
741 ON
IC-7410 GE-7410
SI0410 E
CG 74 10
TH]410
U28 F-54041J4
7404
IC - 7404 GE-7404
S10404
ECG7 404
TH7404
221-Z9076
U2'
SN7420N IC-7420
GE-7420
SI(7420
ECG7420
TH742 0
U30 7414
IC-7414
221-Z9017
SK7414
ECG7414
TM7414
UJ!
7404 IC .. 7404
G E-7404
S1:: 7404
ECG7404
TM7404
U32 F-74 17P C IC-7417
ECG7417
TM7417
221-Z9076
UJJ -2114L-J IC-2l14-LJ
040
IC-L2114-SS0
04 1
F-7417PC IC-7417
ECG7417
1/147417
042- 2114L·3 IC-2114-LJ
U4'
IC - L2114-SS0
QI - Q6
• ELECTROLYTIC CAPACITORS
REPLACEMENT DATA
ITEM
MFGR .
CORNElL-
MAllORY
SPRAGUE PART No.
RATING
No.
PART No.
DU81UER
PART No. I
GE NERAL
PAR T No. Q-lINE
LINE
OJ'
.,
16'
C- 5 06
HLW5 0- 16 TTlSXSOA
OEI-3S1 ITVA·lISO
CAPACITORS
REPLACEMENT DATA
ITEM
RAT1NG
MFGR.
CO RNElL-
SPRAGUE
PART No.
No . PART No.
DU8111ER
MALLORY
PART No.
PAR T No. Q-lINE GENE
RAL UNE
Cl 6S 1 2SV SI C-680 COISED6S0J03 SX468 QWl - 23
MIIA - 680
C2 . 01 1 00Y l OS
C -I 03 WHFlSI [WFIAllO
QFl -91 IP8-SI0
OJ . 01 100'1 l OS C-130 WHflSI
[WFl All 0
QF1-91
IPS - SID
C4 82 SI
COl S[[J32QJ03
SX4S2 QW1 -2S
MIIA- 820
C5
15011('151 C-lSI
GP31S lOTS-TIS
CO
.01 100'1 lOS
C-IO)
WHFlSI EWFlAll0 QFI -91
IP8-SI0
C7 . 022 100'1 l OS C-223 DPI'!S2S22
EW F1AI22
QFI-127 IPS-S22
C8
82 5% COl SEOO2OJO) SX 4 82 QWI-2S
I4IA- 820
C9 .1 l OS
C-I04
DPHS2PI EWFlA010 QFI -21S
IPB - PIO
ClO .001 1 00'1 lOS
( -1 02
OPHS6DI EWFIA2 10 QFI-! IP8-010
C20 .1 I DV
(8 -1041 0
HAGI201 QCl - 223
fiY -360
'"
.1 10'1
(8 -10410
HAGI201 QCI - 223
flY - 360
C22 .1 1 0'1 CS -I041 0
HAGI201 OCI -2 23 HY-360
C23 .1 10'1 C8 -104 10 HAGl201 QCI - 223
HY-360
02. .1 10'1
C8 -1041 0 HAG1201
QCI - 223 HY-360
C2'
.1 lOY C8 -1041 0 HAG1201 QCI - U3
fiY - 360
C2. .1 lOY
CB-I04 10
HAGI201 QCI - 223
HY-360
"8
.1 lOY CB-I04 I0 HAGI201 QCI - 223
HY-360
'"
.1 l OY CB -I 04I0 HA G I2 01 QCI-223
HY-360
"0
.1 l OY
C8 - 10410
HA GI201 OCl - 223 fi V- 360
CJ! .1 lOY CS-I04I0 HAGl201 QCI - 223
fiY-360
"2
.1 l OY C8 - 10410
MAGI 201 QCI - 223
fiV - 360
"3
.1 l OY C8-10410
HAGI 201 QCI - 223 H Y-360
C34 .1 l OY
ClI -I 0410
MAGI 201 QC I-223 MY- 360
C35 •I 1 0V CB - 10410 MAGI 20 1 QCI-223
fiY - 360
C36
.1 10'1 C8 -1041 0
MAGI 20 1 QCl-223 HV-360
<37 .1 l OV C8 - 104 10 MAGI 201 QCI - 223
fiY - 360
C38 .1 lOY
C8 - 10410
KAGt201 QCI - 223 HY-360
•
C39 .1 1 0'1 C8- 1 04 10
MAG1201
QCI-""3
fiY - 360
C40 .1 10'1 C8 -1 0410 MAGI 20 1 QCI - 223 fiY-160
0\1 .1 1 0'1 C8-10410 MAGI 201 QC l-U 3
fiY -360
C42 •I 10V
C8 -1 0410
KtlGt201
QCI - 223
HY-360
C43 .1 10'1 CS -10410 HAGI20 1 QCI - 223
fiY ·360
C4'
.1 10'1 CB -I 04I0 HAG1201 QCI - 22l HY-360
C4'
.1 I OV CB -I 0410
KtlGI 20 1 QCI · 223 HY - 360
IS

C4P- 502 BOARD PARTS LIST AND DESCRIPTION (CONTINUED)
(When ordering porh, dofe Model, Por' Nvmber, and DeJerlphon.)
CONTROLS (All wattages 1/2 watt or Ie .. unle .. listed)
•
, ,
ITEM
REPLACEMENT DAT.IIt
No. FUNCTION
RESISTANCE
MFGR. MALLORY TRW
PART
No.
PART No.
PART No.
011 Frequency 10K RP·103 RVA0911Vl03 X201Rl038
013 Duty Cycle 10K
RP·103 RVA0911 Vl 03 X201Rl038
017 TX Clock
'000
RP·502 RVA0911YS02 X260R5D2B
R75
Duration (Tape Pulse) 1 IlK RP-1Ol
RVA0911 Vl03
X260Rl03B
RESISTORS ( Power ond Speciol)
REPLACEMENT DATA
REPLACEMENT DATA
ITEM
RA TIN G WORKMAN
ITEM
RATING
WORKMAN
No.
MFGR .
No .
MFGR.
PART No. PART No.
PART No. PART No.
R] 1000 511/410 Rl-102 22-1096
'JB
470 SI 1/4W RI-471 Z2 - 1088
Flameproof Ca rbon Flameproof Carbon
FiI ..
Fllm
"
lC* 51 1/.w
RI -103
22 -1120
'39
470 51 1 /4W
RI-471
22-1088
Fl ameproof Carbon
Flameproof Carbon
FUm
Film
"
lOOK. 51 1/4W
R1-104 22-1144
040 410 51 1/4W R1 -471 22 - 1088
Flameproof Carbon
Flameproof Carbon
Fih'! Fil
...
04 10K 51 1/ 4W
Rl-103 22 - 1120
041
470 51 1/4W RI-471 22-1088
Flameproof Carbon
FI ameproof Ca rbon
Fl1m
Fllm
05
470 0 ~S 1/41.'
RI-412 22-1112
Carbon Film '42 470
51 1/4W RI -4 71
22 - 1088
.. 4700 51 1/4W
RI-412 22 -111 2 Flail!leproof Carbon
Carbon Film
"
4700 51 1/4W RI·412
22 -111 2 Film
'43 470
5S 1/41.' RI-471
22-1088
Carbon Fflm
Flameproof Carbon
R8
47005S 1/41.'
R1-472
22-1112
film
Carbon film '44
470 ~I 1/4W
RI-471 22-1088
"
4700 51 1/4W
RI-472 22-1112 Flameproof Carbon
Carbon Film
Fl1m
RlO 10K 5S 1/41.'
Rl-I03 22-1120 04'
470 51 1/4'"
RI-471 22-1088
F1 ameproof Carbon
Flameproof Carbon
Film
Rl2 10K 51 1/4 I.'
RI-l03 22 -1120
f1l11!
04.
220 51 1/41.' RI-221 22-1080
Flameproof
Carbon
flameproof Carbon
FilII!
Film
'l4
1000 51 1/41.' Rl-102 22-1096
'47
390 5% 1/41.'
Rl-391 22-1006
flameproof Carbon
Flameproof Carbon
FilII!
film
Rl5
4700 51 114M
RJ-472 22-1112
R"
220 51 1/41.' RI-221
22 - 1000
Carbon Ffl.. f1aveproof
Carbon
'16
1000 51 1/4'" RI-10l 22-1096
Fll~
Flameproof Carbon '49
390 SI 1/4W RI-391
22-1086
film
Flameproof carbOn
'18
4700 51 114M RI -472 22-1112 Film
Carbon FIl ...
050 220 lOS Ir~W RI-221
22-1000
'19
4700 SI 1/4W Rl-472 22-1112
Fl ameproof carbOn
Carbon Film Film
"0
4700 5% 1/41.' RI-412 22-1112
051 390 5% 1/41.'
Rl-391 22 - 1086
CarbOn Fll~
Flameproof Carbon
'"
4700 5% 1/41.'
RI-412 22-1112
Fl1m
Carbon Film
R52 10K 51 1/4W
RI-I03 22 -1120
"2
4700 51 1/4W
RI-472 22-1112
Flamep roof CarbOn
carbOn Film Film
•
"3
4700 5% 1/4W
RI-472 22-1ll2
R5J
410 51 1 /4W
RI-471 22 - 1088
Carbon Film Flameproof
CarbOn
".
4700 51 1/4M
RI-472 22 -1112
Carbon Fl1m
Film
05.
10K 51 1/41.'
Rl-I03 22 - 1120
'"
4700 51 1/411
Rl -4 72 22-1112 Flameproof Carbon
Carbon Film
".
10K 51 1 /41.'
RI -I03 22 - 1120
Fl1m
05'
10K 51 1/4W Rl-103 22-1120
FI ameproof Ca rbon Flameproof Carbon
F1\1I!
"7
100 51 1/4W Rl-l01 22-1072 Film
Flal!leproof Carbon
OS.
470 5% 1/4W
RI-411 22 -1 008
Film Flameproof Carbon
"8
470 51 1/4W
RI-471 22-1008
Fl1m
Flalftt!proof Carbon
R57
10K 51 1/41.' Rl-103 22-1120
, FilII Flameproof Carbon
'29
470 51 1/ 41.' RI-471
22-1088
Fl1m
Flameproof Carbon
058 10K 51 1/41.'
Rl - l03
22-1120
fl1m
Flameproof Carbon
"0
470 51 1/4W RI-471
22 - 1088
film
flameproof Carbon
059
470 5% 1/4W
RI-471 22-1088
Film flameproof
Carbon
film
'"
470 51 1/4W RI -4 71 22-1088
"0
10K 51'; 1/4W RI-I03 22 - 1120
Flameproof Carbon Flameproof Carbon
film
Fl1m
"2
470 ~S 1/411' RI-471
22-1088
'"
10K 51 1/4W Rl-103 22-1120
Flameproof Carbon Flameproof Carbon
Fl1m
Fflm
RJJ
470 51 1/411' RI-471 22- 1088
"2
4700 51 1/41.' RI -4 12
22-1112
Flameproof
Carbon
Flameproof Carbon
Fllm
Film
".
470 SI 1 14M
Rl - 471
22-1088
"3
10K 51 1/41.'
RI-l03 22-1120
Fla.rneproof Carbon Flameproof Carbon
Film
FUll!
RJ5 470 SI 1/41.' RI - 471 22-1088
Flameproof Carbon
".
4700 51 1/4'" RI-472 22-1112
Film
Ca r bon Film
".
470 5S 1/4W RI-471 22-1088
'"
10K 51 1/4W
Rl-103
22 -1120
Fl ameproof Ca rbon Flameproof Carbon
film
Film
"7
47 0 51 1/41.' Rl-471 22 - 1088
".
4 700 51 1/41.'
RI - 472
22-1112
Flameproof Carbon
Carbon Film
fOm •
16