Toshiba 1550 Service Manual page 181

1560 Logic Circuit (PWA-F-LGC) 6/8
1
A
EXP
[EXP]
B
5VSWON
[5VSWON]
C
WDT
[WDT]
D
ACOFF
[ACOFF]
E
F
1
1550/1560 CIRCUIT DIAGRAMS
2 3
VDD
D3
1SS184
R62 1/10W1000
1 2
RTP
R75
1 RTP 2 1/10W1000
1 1
C23 C21
CC0.1/25 CC0.1/25
2 C 2 C
GND GND 1 1
C5 C3
CE22/16 CE4.7/16
2 2
GND GND
R76
C31
1 RTP 2
CC0.1/25
1/10W4700
1
C22
CC2200P/50 2 C
GND
MC74
2
HC 3
1
00F
IC16
VDD
VDD
R77 1/10W4700
1 RTP 2
R94
1/10W4700
MC74 MC74
HC14F HC14F
R93 1 2 1/10W22K 13 12 3 4
RTP
IC19
IC19
1
2
GND
2 3
HINT
How to search for where a signal in a
circuit diagram has jumped to.
4 5
VDD
R60
1/10W4700
MC74
10
HC 8
9
00F
IC16
11 10 13
BB QB
5 6 12
BA QA
12 9
AB NQB
4 7
AA NQA
14
CX/RXB
2
CX/RXA
13
CLRB
3
CLRA
16
VDD
R61
1 15 RN1401 3 1 RTP 2
GND2
4700
8 1
GND1 Q5
2 C
1 2
GND0
IC20
4700
14538F
GND
D5
1SS193
GND
MC74
5
HC 6
4
00F
IC16
MC74
HC14F
R91 1/10W1800 R92 1/10W4700
1 RTP 2 1 RTP 2 5 6 9
IC19
D7
1SS181
C2
CE4.7/16
R67
1 2 1/10W4700
RTP
1
C28
CC2200P/50
2 C
GND
4 5
6 7
+5VSW
4700
MC74 2
HC 11 1 Q4
00F
4700 3 R59 1 2 1/10W330 EXP-ON
IC16
RTP
RN2401
VDD +5VSW
R42 1 2 1/10W4700
RTP
2
1/10W1000
1 Q2
2SA1313Y
3
R39
1/10W4700
GND
MC74
HC14F
8 RST
IC19
7407M
13 12 DSP-RST
IC18
GARST
5VCHK
6 7
14 - 14
8
A
B
[EXP-ON]
C
D
[RST]
[DSP-RST]
[GARST]
[5VCHK
E
F
6
8 8
Mar. 1998 © TOSHIBA