Commodore | SX-65 Portable | Commodore SX 64 Portable Computer Schematics

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DECEMBER, 1985
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TP33
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4.7K
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PART NO. -
SX 64
PORTABLE COMPUTER
SCHEMATICS
Commodore Business Machines, Inc.
1200 Wilson Drive, West Chester, Pennsylvania 19380 U.S.A.
Commodore makes no ex'pressed or implied warranties with regard to the information contained
herein. The information is made available solely on
an as is basis, and the entire risk as to quality and
accuracy is with the user. Commodore shall not be
liable for any consequential or incidental damages
in connection with the use of the information contained herein. The listing of any available replacement part herein does not constitute in any case
a recommendation, warranty or guaranty as to
quality or suitability of such replacement part.
Reproduction or use without expressed permission,
of editorial or pictorial content, in any matter is
prohibited.
This manual contains copyrighted and proprietary information. No part
of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic, mechanical,
photocopying, recording or otherwise, without the prior written permission of Commodore Electronics Limited .
Copyright © 1985 by Commodore Electronics Limited.
All rights reserved.
314001-05
CONTENTS
Title
Page
INTRODUCTION .......................................... .......................................................
1
ASSEMBLY PARTS ............ .. ..............................................................................
1
BLOCK DIAGRAM ..............................................................................................
2
CPU
PCB LAYOUT ............................................................................................
3
PARTS LIST ..............................................................................................
4
SCHEMATIC ..............................................................................................
6
PCB LAYOUT ............................................................................................
7
PARTS LIST ..............................................................................................
8
SCHEMATIC ......................................................................................... ... ...
10
PCB LAYOUT ............................................................................................
11
PARTS LIST ..............................................................................................
12
SCHEMATIC ......................................................................... : ....................
13
FDD
I/O
EXPANSION
PCB LAYOUT ............................................................................................
14
SCHEMATIC ..............................................................................................
15
MONITOR
PCB LAYOUT ............................................................................................
16
PARTS LIST ..............................................................................................
17
SCHEMATIC -
01 .....................................................................................
20
SCHEMATIC -
01A ..................................................................................
21
WIRING DIAGRAM .....................................................................................
22
PARTS INFO .............................................................................................
23
TROUBLESHOOTING .............................. ... ....... .. ........................................
24
SCHEMATIC ..............................................................................................
25
PIS 250623
INTRODUCTION
The SCHEMATICS and PARTS LISTS provided herein are intended for use by QUALIFIED SERVICE
PERSONNEL. The troubleshooting, theory and diagnostics of the C64, 1702 and 1541 SERVICE
MANUALS are generally applicable to the SX 64.
Parts availability from Commodore is limited. Some of the custom chips are used in many devices
and are in stock. However, parts used in the monitor and power supply may be unique to the OEM
manufacturer who supplied those assemblies. Only those parts indicated with a "C" are available
from Commodore.
ASSEMBLY PARTS
C
C
C
C
C
C
250634-01
251249-01
251250-01
251555-01
314095-01
325519-03
SX
SX
SX
SX
SX
SX
64
64
64
64
64
64
KEYBOARD CABLE
USERS MANUAL
DEMO DISK
KEYBOARD
SINGLE KEY ASSY
ALPS DRIVE ASSY
1
BLOCK DIAGRAM
[XPANSION PCB ASSY
EXPANSION
CAR{)EDCTE CONN 44P
USERS POR1
24-P
EXT SERIAL BUS 6P
EXT MONITOR Sf
CONTROL USERS PORT
ROW qp:. f)-SUB
'CONTRL USE RS PORT
CflL q p,'n DSUB
CONNECTOR PCB ASSY
SP
FDD
UNIT
1 SERIAL BUS CABLE ASS'(
2
3
45
6
EXT 8P CABLf ASS'(
KFfBo.'IRD lNNE-R CABLf ASS'!'
EXT 6P CABLE ASS"USERS 4-0P CABLE ASSY
EXPANSION SQP CABLE ASS'(
JI
CPfJ
KEYBOARD CABlE
0~
KEY
BOARD
SX 64 CPU
PCB LAYOUT
5)(-64 C? V
Ian
P. I\;C 251102. REV R
~ ~
+
.....
a.:
" "
MDK I/V-O
C)comrnodore
U
1011
l-5's ("~15C 9 I btH7SO
~o'
0 '
~ ~:- p~~ ?I
v
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SVI1:::r,
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(
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51111
I
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U· -"",
,.,
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to-,lll
c;
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C)
I
N
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100-001.,1.,
~
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60 ~
c3S J.an
0 159
I- -
Cf02
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5.1 W
5EE DETAIL A
~IIIIIIIIIIII~
DETAiL A
PARTS LIST
SX 64 CPU
PCB ASSEMBLY #250408-01
PLEASE NOTE
Commodore part numbers are provided for reference only and do not indicate the availability of parts
from Commodore. Industry standard parts (Resistors, Capacitors, Connectors) should be secured locally.
INTEGRATED CIRCUITS
UA3
UA4-UA7
UBl
UB2
UB3
UB4-UB7
UCl
UDl
UD3
UD4
UD7
UE3
UE4
UE7
UF4
UF6
UF7
UG6
UG7
DO NOT USE TI OR NS
74LS257
4164 DRAM 200NS
74LS258
74LS373
DO NOT USE TI OR NS
74LS257
4164 DRAM 200NS
74LS139
C 901225-01
2332 ROM CHAR
C 251104-04
2364 ROM Kernal
C 901226-01
2364 ROM Basic
C 906107-01
6510 Microprocessor
C 906112-01
6581 SID
C 906114-01
7700-001 PLA
2114 RAM 300NS
C 906109-04
6567 VIC
7408
7406
4066
555 TIMER
2SC 458
DIODES
Dl
Diode. Signal WG 713C
RESISTORS - All Values are in ohms-l/4 W
5% unless noted otherwise.
Rl
R2
R3
R4
R5
R6
R7
R8
R9
Rl0, 11,
12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R31 . 32.
33
R34
R35
R36
R37
270
lK
1M
47K
330
3.3K
150
lK
120
200
RESISTOR PACKS
RA1.2
RA3
RA4
33
3.3K
3.3K
8Pin
10Pin
8Pin
CAPACITORS
TRANSISTORS
TRl-8
RESISTORS (Continued)
82
150
100
1.5K
3.3K
18K
8.2K
lK
lK
10K
lK
270
100
27K
20K
820
2K
510
Cl. 2
C3
C4-7
C8
C9.10
Cll
C12-1 4
C15-17
C18-20
C21
C22
C23
C24
C25
C26
C27
C28
C29
C30
C31 , 32
C33
C34
C35
C36
C37
C38
C39
C40-46
C47
C48
Ceramic
Elect
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Elect
Ceramic
Elect
Ceramic
Elect
Ceramic
Ceramic
Elect
Ceramic
Ceramic
Ceramic
Elect
Ceramic
Ceramic
Ceramic
Ceramic
Elect
Ceramic
Ceramic
Elect
Ceramic
Elect
Ceramic
O.22JtF.
10JtF.
0.22JtF.
0.47JtF.
0.22JtF.
0.47JtF.
O.lJtF.
10JtF.
O.lJtF.
10JtF.
O.lJtF.
10JtF,
470pF,
0.47JtF,
10JtF,
0.22JtF,
0.47JtF,
O.lJtF,
10JtF,
2200pF,
0.22JtF,
270pF,
0.47JtF,
10JtF,
O.OlJtF,
150pF,
10JtF,
O.lJtF,
10JtF,
O.lJtF,
25V
25V
25V
50V
25V
50V
25V
25V
25V
25V
25V
25V
50V
50V
25V
25V
50V
25V
25V
50V
50V
50V
50V
25V
25V
50V
25V
25V
25V
25V
4
PARTS LIST PCB ASSEMBLY #250408-01 (Continued)
C - Indicates Commodore Stocked Part Number
CAPACITORS (Continued)
C49
C50
C51
C52
C53. 54
C55
C101
C102
C110
C111.12
C113
C114
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
1000pF.
470pF.
33pF.
0.047/LF•
1800pF.
0.1/LF.
82pF
68pF
150pF.
330pF
100pF
68pF
MISCELLANEOUS
25V
50V
50V
25V
50V
25V
FB1-14
Ferrite bead
L1
L2
Coil Inductor 2.2/LH
Coil Inductor 22/LH
Y1
Clock Osc 14.31818 MHz 251105-01
50V
5
SX 64 CPU
SCHEMATIC DIAGRAM
2 C>--11--...-- 5 V
JIli("fxr-fNS/ON BIIS)
(Ps-tv.!>iJ -f)~TSI-I)
6
D
IN
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00:1 '179 XS
PARTS LIST
SX 64 DISK CONTROL PCB
PCB ASSEMBLY #250410-01
PLEASE NOTE:
Commodore part numbers are provided for reference only and do not indicate the availability of parts
from Commodore. Industry standard parts (Resistors, Capacitors, Connectors) should be secured locally.
RESISTORS (Continued)
INTEGRATED CIRCUITS
- All are carbon 1/4 watt, 5% unless noted
UA1
UA3
UA4
UB2
UBC3
UBC4
UC2
UD2
UD3
UDC5
UE2
UE3
UF2
UF3
UF5
UG4
UG5
UH1
UH4
UH5
UJ1
UJ4
UK4
TMM2016P RAM
ROM $EOOO-$FFFF
ROM $COOO-$DFFF
74LS04
6522 VIA
6502A CPU
74LSOO
74LS42
74LS86
6522 VIA
74LS14
7406
M54532P TRANS ARRAY
ULN2064 TRANS ARRAY
7404
GATE ARRAY
7407
74LS193
592 VIDEO AMP
9602 ONE SHOT
74LS197
592 VIDEO AMP
74LS86
LM311 COMPARATOR
C 901229-05
C 325302-01
C 901437-01
C 901435-02
C 901437-01
MITSUBISHI SUB:
C 325572-01
TRANSISTORS
TR1
TR2-5
TR6
TR7
2SC
2SA
2SA
2SC
945
733
673
945
SUB:2SC 1815
SUB:2SA 1015
SUB:2SC 1815
Signal,
Zener,
Signal,
Zener,
Signal,
1N4148
5.1V, 500mW, +/-5% HZ5C-2
1N4148
3.3V, 500mW, + /- 5% HZ3C-2
1N4148
RESISTORS - All are carbon 1/4 watt,
5% unless noted
R1
R2
R3
R4
R5
R6
470
2.2K
150 1/4W, 1%
100 1/4W, 1%
2.2K
470
2.2K
22K
9.1K 1/4W, 1%
220
150
330
2.2K
470
360
510
22K
360
5.1K
220
330
1K
330
150
100K
1K
10K
100
1K
47
CAPACITORS
DIODES
D1-6
D7
D8
D9
D10
R7, 8
R9
R10
R1 1
R12
R13
R14
R15, 16
R17 , 18
R19, 20
R21 , 22
R23
R24, 25
R26, 27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37 , 38
R39
R40-43
R44
R45
R46-49
R50
680
22K
91 1/4W, 1%
1.5K
470
680
C1 , 2
C3
C4
C5
C6, 7
C8
C9
C10, 11
C12
C13
C14
C15
C16
C17
C18
C19-21
Ceramic
Electrolytic
Ceramic
Ceramic
Tantalium
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Electrolytic
Ceramic
.1/LF,
3.3/LF,
.1/LF,
680pF,
0.47/LF,
.1/LF,
1000pF,
.022/LF,
330pF,
.1/LF,
680pF,
330pF,
680pF,
33pF,
10/LF,
.1/LF,
25V
16V
25V
50V
16V
25V
25V
25V
50V
25V
50V
50V
50V
50V
25V
25V
8
PARTS LIST SX 64 CPU PCB ASSEMBLY #250410-01 (Continued)
C - Indicates Commodore Stocked Part Number
CAPACITORS (Continued)
C22-30
C31
C32.33
C34-41
C50
Ceramic
Electrolytic
Electrolytic
Ceramic
Ceramic
MISCELLANEOUS - PCB ASSY #1540048
.1JtF.
100JtF.
10JtF.
.1JtF.
1000pF.
25V
16V
25V
25V
25V
FB1-10
Ferrite Bead
L1-3
L4.5
L6
Coil Inductor 100JtH
Coil Inductor 22JtH
Coil Inductor 2.2JtH
Y1
Crystal Module 16 MHz 50ppm (NDK. Tyocom)
325566-01 Sub:
Crystal Module 16 MHz 100ppm (NDK. Tyocom.
Kyocera)
325566-02
9
SX 64 FDD
SCHEMATIC DIAGRAM
Utili I
t.tv ,-_ __ _....II.!:IIo\!!..H!!il'-.--.J
~1-
-= ......
1",1 IF
J1
~
___
~np "~5
(Hl ~J(] -50P-l.5"~P~
j2'P~
• •
,. pJ
P4
R/
~11
p~
tl1<f
P6
, Wfi?/JC
V"f~l()
oc
....--
p7
Hitc
2Sc9f,t
TRI
-
;t-
Pow.~ Cd
PZ3
IAr~
(12IS"-DoA)
-,tUv
-=P22
10
SX 64 1/0
PCB LAYOUT
27
so
25
t')
....
~
C5
@~
~ 0-666 @
~
Gill
>
I
SS6
UEJ
CfE)
C4
"b
'<:I
> LS 74 I
UEZ
~
~
)viPS oS 26
f
UB3
~
~~~'" ~I\l
(104. )
@f6~6@f
~~~~~~
«. .... ~ v,
~
o~
( ~~
IQ)
I at.
C/
til
MAS 6526
t
UlJ2
I
(~~~
(104. )
" " "@
6~o 60. ~2>
til til
+
18
f
I
....
....
It.
~o0
PI3
4066
uel
UDZ
~
til
c:f)RI
6"6~61\l
I
@~
~~>
7400
(8
~
I I
102J
II
6
I~; 2;\
1:1
I
PII
6
PI2
PIO
RAI
~@~
LQT-60X
'6o~
1:0
I
2.
PIS
v-
PARTS LIST
SX 64 1/0
PCB ASSEMBLY #250409-01
PLEASE NOTE:
Commodore part numbers are provided for reference only and do not indicate the availability of parts
from Commodore. Industry standard parts (Resistors, Capacitors, Connectors) should be secured locally.
INTEGRATED CIRCUITS
UC1
UB2. 3
UD2
UE2
UE3
4066
6526 CIA
7406
74LS74A
556
RESISTOR PACK
RA1
TRANSISTORS
TR1
1K
8Pin
C 906108-02
2SC 945
RESISTORS - All Values are in ohms-1/4 W
CAPACITORS
C1 -5
C6
C7
C8-11
C12. 13
Ceramic
Ceramic
Ceramic
Ceramic
Elect
0.1JLF.
0.47JLF.
330pF.
O.1JLF.
10JLF.
25V
50V
50V
25V
25V
MISCELLANEOUS
5% unless noted otherwise.
R1
R3
R4
R5. 6. 7
R8
R10
R11
220
3.3K
47K
1K
100K
3.3K
47K
FB1 -6
Ferrite Bead
L1
Coil Inductor 2.2JLH
UA1
Crystal Module 60Hz
12
SX 64 1/0
SCHEMATIC DIAGRAM
AI+ -I-
:! =
t!:"t:;!lII---+-",.u1
~; :~~I---+-"I'"
A'_~
AID-I.;:
All-&":
AI2-HA13-
-
PIt;
AC POWER
13
SX 64 EXPANSION
PCB LAYOUT
s<PANSSION PS
GND
+5V
+5 V
I RQ
WW
1
GNV
3
30
8
27
2
3
4
K>Dt..H!
1
1101
29
frAME
E)(ROM
170 z.
G
ROML
31
q
5
10
All
4-
I I
AID
2
'1
GND
",.
S¢2
A/5
Alt+
413
AIZ
SA
OPEN
5
6
RESET
NMi
'7
8
D~
DO
EXPANSSION
9
DOT CLOCK
07
06
05
04
03
02
01
Je
12
13
19 14
44
20
45
21
46
22
47
18
23
24
25
15
16
17
18
19
20
21
22
-
-
N1
A8
A'1
Ab
AS
A4A3
A2
A1
AO
GND
OPEN
"
II
P8
J8
34
28
33
32
26
z3
24
zs
Zb
2'1
10
2~
3S
2'1
30
/
,
36
3/
/2.
3'1
32.
39
15
4-0
K.
P8
-
3l>
Zb
26
gg
1
1
l3
I
I
I
I
II
3'7
39
3q
4-0
16
41 1.1-1
17 42.
42 4-3
43 4-LJ48 49 50 -
-:l
n
J8
33
13 ~4:
38 35'
I~-
CABU: M
I I
II
II
I
I
I
co
5"0 cc
Z1
2~
JO
IJ
j
I
SX 64 EXPANSION
SCHEMATIC DIAGRAM
erNO
'I
OC.5V
""I
)0
RESET ,,;::::
eNT,
IlTN
PB,
PE32
~
33
PB3
3~
PB4PBs
PBI>
3S
,7
P67
"8 ;;..
;::: B
;::: F
.....
I?DWq50Y Ao
I
I1OW\IJ-oY AI
Z""
,:,'2
~
;:;9-
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2Lt-P Edge Connector
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SX 64 MONITOR ASSEMBLY
PARTS LIST
PLEASE NOTE:
Commodore part numbers are provided for reference only and do not indicate the availability of parts
from Commodore. Industry standard parts (Resistors, Capacitors, Connectors) should be secured locally.
CHASSIS PARTS
V01
OY1
T502
0907
0503
R523
C001
*CRT,
* CRT Socket,
*Oef. Yoke,
* F.B. Transf.
Transistor,
Transistor,
* Focus Pack,
* Ceramic Cap,
150BMB22-AF
C39158-0
C29131-VA (See note below)
CJ39587-00A
2S01118
2SC2335
CJ49510-257
1000pF, 3KV, + 100%, -0%
NOTE:
IF DEFLECTION YOKE CJ26235-00A IS USED,
THE FOLLOWING PARTS VALUES CHANGE:
DEF and POWER REG PCB 1124 A-1
VIDEO and AUDIO PCB 1124 A-2
CAPACITORS
CAPACITORS
C515.517
C519.520
* Polypropylene.
* Elect.
5600pF.630V. ± 5%
4 .7/LF. 160V. +30% . -10%
*SAFETY COMPONENTS -
C201
C206
C522
Elect.
Bi-Polar Elect.
Mylar.
1000/LF.25V. ±20%
4 .7/LF.50V. ±20%
.1/LF.50V. ±20%
Use EXACT replacement ONLY.
17
DEF and POWER REG PCB 1123 A-1
CAPACITORS
INTEGRATED CIRCUITS
C401 , 404 Bi-Polar Elect,
C408
Tantalium,
C40S, 410 Tantalium,
C412
Elect,
C413
Elect,
C50S
Polypropylene,
C515,16,
* Polypropylene,
17
C518
Mtl Mylar,
* Polypropylene,
C520
* Elect,
C523, 24
C525
Elect,
CS01
* Elect,
CS04, S05 * Elect,
CS07
Bi-Polar Elect,
CS13, S14 * Elect,
IC401
IC501
Vert., /LPC1031H2
Hor., AN5750
TRANSISTORS
0401
0501
0502
OS02
OS03,4,5
OS06
OS07
2SA1015
2SC1685
2SA817A
2SA 1015
2SC1685
2SA817A
2S01118
(Y, GR)
(O,Y)
(Y, GR)
(O,Y)
1/LF,
1/LF,
22/LF,
1000/LF,
0.22/LF,
5600pF,
4700pF,
50V, ±20%
25V, ± 10%
10V, ± 10%
25V, ±20%
50V, ±20%
50V, ±5%
630V, ±5%
1.5/LF,
0 .047/LF,
470/LF,
4.7/LF,
100/LF,
470/LF,
10/LF,
2200/LF,
100V, ± 5%
200V, ± 10%
16V, +30%, -10%
160V, +30% , -10%
35V, +30% , -10%
35V, +30%, - 10%
25V,±20%
16V, +30%, - 10%
DIODES
0501
0502
0504,5,
6,7
OS02
OS03
OS04
OS05
OS06
OS07
OS08, S
Zener R06.8E (B2)
V1SE
VOSE
U1SB
*Zener R06 .8E (B2)
Zener Hz12 (B)
*Zener R06.8E (B2)
1S2473H
*Zener R013E (B1)
1S2473H
TRANSFORMERS
TS01
T501
T502
T531
Pwr Orive,
Hor Orive,
* F.B.,
* Side Pin,
A76567-MA
A76568-MA
CJ3S587-00A
C3S084-A
MISCELLANEOUS
F03
* Fuse, 2A, 125V
VIDEO and AUDIO PCB ASSY 1123 A-2
RESISTORS
RS01
RS10
RS17
RS23
RS24
RS25
RS26
INTEGRATED CIRCUITS
*Carbon, 8.2K, 1/4W, ± 5%
*Carbon, S.1K, 1/4W, ±5%
Oxide Mtl Film, 1.5K, 1W, ± 5%
*Carbon, 27K, 1/4W, ±5%
*Carbon, 10K, 1/4W, ±5%
*Carbon, 68K, 1/4W, ±5%
Mtl Film, 0.22, 2W, ± 10%
IC201
IC601
Audio, HA 11401
Video, AN5250
TRANSISTORS
0201
0601
2SA562TM (Y)
2S01133
VARIABLE RESISTORS
DIODES
R40S
R413
R417
R508
RSOS
V. Hght, 22K
V. Lin, 2.2K
V. Center, 1K
Hor. Hold, 2.2K
*B1 Adj., 2K
0601
0503
Zener, R010E (B3)
1S2076A
* SAFETY COMPONENTS - Use EXACT replacement ONLY.
18
VIDEO and AUDIO
PCB ASSY 1123 A-2 (Continued)
CHROMA PCB ASSY 1123 A-3
INTEGRATED CIRCUITS
VARIABLE RESISTOR
IC301
R220
HA11247
Sub Cont, 2K
TRANSISTORS
CAPACITORS
0701,2,3
C201
C202
C203
C204
C206
C208
C210
C604
C608
C522
Elect,
Bi-Polar Elect,
Elect,
Tantalium,
Bi-Polar Elect,
Tantalium,
Tantalium,
Bi-Polar Elect,
Elect,
Bi-Polar Elect,
2200JlF,
10JlF,
3.3JlF,
0.47JlF,
3.3JlF,
33JlF,
1JlF,
1JlF,
1000JlF,
0.47JlF,
16V,
16V,
25V,
35V,
50V,
16V,
25V,
50V,
25V,
50V,
MISCELLANEOUS
FR526
L504
L601
* Fusible Resistor, 10, 1/4W, ± 5%
Peaking Coil
100JlH
Peaking Coil
4.7JlH
+30%, -10%
±20%
+30%, -10%
±20%
±20%
± 10%
±20%
±20%
±20%
±20%
2SC2610
RESISTORS
R710,11,
12
Oxide Mtl Film, 12K, 1W, ± 5%
VARIABLE RESISTORS
R702
R705
R706
R708
R709
B. Cut-Off, 10K
R. Cut-Off, 10K
R. Drive, 500
G. Cut-Off, 10K
G. Drive, 500
CAPACITORS
C303
C304
C306
C310
C315
Elect,
Elect,
Elect,
Trimmer
Elect,
100JlF,
0.47JlF,
4.7JlF,
16V, ±20%
50V, ±20%
50V, ±20%
33JlF,
16V, ±20%
MISCELLANEOUS
X301
-
Crystal A75746
*SAFETY COMPONENTS - Use EXACT replacement ONLY.
19
SX 64 MONITOR
SCHEMATIC -01
l
Q701,Q702.Q703
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C103
R707
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20
SX 64 MONITOR
SCHEMATIC -01A
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VIDEO & AUDIO PCB
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ROLO
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DEF. POWER REG PCB
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21
POWER SUPPLY #250623
WIRING DIAGRAM
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22
PARTS INFORMATION
1,
REC 1
RECTIFIER STACKS DronES
S3WB40
rv
+
2.,
REC2
S1 VB1 0
RECTTFIER STACKS UIODES
3,
D1
ERB24-06C
FAST RECQVERY
4,
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m
®
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Ql
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Q3
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~DIODES
SCHOTTKY BARR IE-RDIOUE-3-
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@
POWER TRANS1STOR
2.3..C2334
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B - - ( (c.,e
c
E
POWER TRANSISTOR
C,case)
JEDEC:TO-220AB
23
TROUBLESHOOTING GUIDE
CAUSES AND TEST
CHECK POINT
TROUBLE
NO OUTPUT-t-SOME SCRAP INSIDS---+--SHORT CIRCUIT BIY
SCRAP-y.!...E""S"---------~,
I
10K
~gT~gT 9~, -SUPPLEMENOTKARY
CIRCUIT--T2 TRANSFORMER SHORT OR OPEN-=..YE""S"----------"--(
T2 PRIMARY LEAD WHITE TO WHITE 160~200A
.
J
SECONDARY LEAD RED TO RED
9~12 A
: • •• •••••••••• ••••••••••••••• • ••••• SECONDARY LEAD BLUE TO BLUE 3.2"'3.7.n.
10K
REC2 S1VB-10 DIODE
RECTIFIED VOLTAGE
J
IN CASE 0
DC 12~15V
REC1 SHOR'Il---cHECK BRIDGH DIODE--+- REC1 S3WB40 SHORT OR OPEN-=..YE:::.S"--------+I--<CHANGE REC1
FUSE IS CUT
OK
~
-0+
IN CASE OF
Q1 SHORT !--CHECK SIHTCHING _ _ _-+_ Q1 2SC2625 SHORT OR OPEN=-YE
...S"---------~CHANGE Q1
FUSE IS CU~ TRANSISTOR
B
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0K
I
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I
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CHECK HIGH-SPEED
RECTIFY DIODE
I
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i
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I OF 2SC2625 IN Q1 BY SYNCHRO-SCOPE
~
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120"-JO~1
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i
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12V OUTPUT ADJUSTMENT SHIFT-Y.!...E~S~_------- RE~ALIGNMENT
I
5V output
ONLY NO ---'---(CHECK SWITCHING _ _ _--l.,_ Q3 2SC2334 SHORT OR OPEN-=..YE""S"----------(CHANGE Q3
OUTPUT
TRANSISTOR
I'
I
!OK
CHECK DRIVE
TRANSISTOR
10K
i
CHECK HIbH-SPEED
_____-11_
RECTIFY DIODE
.
FK
5V CONTRloL
CIRCUIT
B-<:
I
Q4 2SA1020-0orY SHORT OR
OPEN-Y~E~S~-----~CHANGE
Q4
,
B~:
,
\
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D7 ESAC82-004 SHORT OR OPEN-Y.!...E
I
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I
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CHEC BETWEEN EMITTER OF 2SC2334 AND
GRUND IN Q4 BY SYNCHRO~SOOPE ~
NO
i
I
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~~
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1 zO-,30,.A-s
IYE.S
5V OUTPUT AtJUSTMENT
SHIFT---Y::..:E::..:S~------+-_RRE-ALIGNMENT
24
POWER SUPPLY #250623
SCHEMATIC DIAGRAM
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