Service manual

AL-1661CS CIRCUIT DIAGRAM 13 - 32
OPERATION PWB (KEY / Buzzer Section)
R322
2kJ
KEY318 NM4K
KEY325 CLK
KEY309 SHPK
R320
2kJ
C317 Open
C320 Open
C334 Open
D301 1SS133
KEY323 NM2K
C313 Open
C319 Open
Q306
KRC106S
1
2
3
C318 Open
KEY310 PSW
R314 100J
KEY315 NM7K
C336 Open
R311 100J
KEY319 NM5K
IC303
74HC238
Y0
15
Y1
14
Y2
13
Y3
12
Y4
11
Y5
10
Y6
9
Y7
7
A
1
B
2
C
3
G2B
5
G2A
4
G1
6
KEY308 NM0K
R321
2kJ
C304 Open
KEY321 CAK
R338 1kJ
C335 Open
R318 33J
R339 10kJ
KEY306 MAGK
KEY320 NM6K
R341
2kJ
D302 1SS133
C312 0.1u
BZ301
PS1720P02 1
2
R337 1kJ
R340
2kJ
C315 47pF
KEY302 CASK
R319
2kJ
R310 100J
KEY317 NM9K
R343
2kJ
C321 0.1u
R336 1kJ
R312 100J
C316 Open
KEY316 NM8K
KEY324 NM3K
KEY303 DUPK
R317 1kJ
KEY304 ESTK
R342
2kJ
R308 100J
C309 Open
C310 Open
KEY313
UPK
C314 Open
R313 100J
C311 Open
KEY322 NM1K
R316 1kJ
KEY301 MODK
IC302 74HC151
D0
4
D1
3
D2
2
D3
1
D4
15
D5
14
D6
13
D7
12
A
11
B
10
C
9
G
7
W
6
Y
5
KEY312 DWK
C337 Open
KEY307 ASTK
KEY305 EXMODK
KEY311 MENUK
KEY314 ENTK
R307 100J
R315 1kJ
R309 100J
D303 1SS133
5V
5V
5VEN
KEYSC1 KEYSC2 KEYSC3
KEYIN
SELIN3 SELIN2 SELIN1
PSW
F-KEYSC2 F-KEYSC3 F-KEYSC1
F-KEYIN1
F-KEYIN2
F-KEYIN3
F-KEYIN4
F-KEYIN5
F-KEYIN6
F-KEYIN7
F-KEYIN8
BZR
2/3
A A
B B
C C
D D
E E
4 4 3 3 2 2 1 1