Toshiba 1550 Service Manual page 173

Logic Circuit (PWA-F-LGC) 6/8
1
A
B
EXP
1B8
5VSWON
1B8
C
WDT
1E8
D
ACOFF
7D3
GND
E
F
1
1550/1560 CIRCUIT DIAGRAMS
2 3
VDD
D3
1SS184
R62 1/10W1000
1 2
RTP
R75 1/10W1000
1 RTP 2
1 1
C23 C21
CC0.1/25 CC0.1/25
2 C 2 C
GND GND C5 1 1 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 1/10W22K
1 RTP 2 13 12 3 4
IC19 IC19
C70
0.1/25
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
BB QB
5 6
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
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
IC19
D7
1SS181
1
C2
CE4.7/16
2
GND
R67 1/10W4700
1 2
RTP
1
C28
CC2200P/50
2 C
GND
4 5
6 7
+5VSW
4700
MC74 2
13
HC 11 1 Q4
12
00F
4700 3 R59 1/10W330 EXP-ON
IC16 1 2
RTP
RN2401
VDD +5VSW
R42 1/10W4700
1 2
RTP
2
1/10W1000
1 RTP 2 1 Q2
2SA1313Y
3
R39
1/10W4700
GND
MC74
HC14F
9 8
IC19
7407M
13 12 DSP-RST
IC18
MC74
HC14F
11 10 GARST
IC19
5VCHK
6 7
8
A
B
8B3
C
D
RST
1E2
7B6
2E7
1B2
E
F
8 6
8
14 - 6 Mar. 1998 © TOSHIBA