Service manual

AL-2030/2040CS/2050CS CIRCUIT DIAGRAM 13 - 32
5V
5V
5VEN
5V
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
BZR
CAK
NM6K
NM1K
NM8K
RAT
ENTLK
MODK BPK
MENU
RK
NM7K
SHPK NM4K
NM2K
CLK NM3KNM5K
NM9K
NM0K ASTK EXP
ESRT
2SIDE
PSW
R312 100JR312 100J
R343
2kJ
R343
2kJ
KEY315
SKQNABD010
KEY315
SKQNABD010
TP26TP26
R317 1kJ
KEY306
SKQNABD010
KEY306
SKQNABD010
R339 10kJR339 10kJ
KEY321
SKQNABD010
KEY321
SKQNABD010
C317 Open C317 Open
R307 100JR307 100J
C309 Open
TP36TP36
C319 Open
TP29TP29
R313 100JR313 100J
TP24TP24
TP17TP17
BZ301
PS1720P02
BZ301
PS1720P02
1
2
C334 Open C334 Open
KEY325
SKQNABD010
KEY325
SKQNABD010
R309 100JR309 100J
KEY307
SKQNABD010
KEY307
SKQNABD010
C310 Open
C318 Open
TP25TP25
TP33TP33
KEY322
SKQNABD010
KEY322
SKQNABD010
KEY313
SKQNABD010
KEY313
SKQNABD010
TP19TP19
KEY302
SKQNABD010
KEY302
SKQNABD010
D302 1SS133 D302 1SS133
R318 33JR318 33J R338 1kJ
C311 Open
KEY324
SKQNABD010
KEY324
SKQNABD010
C316 Open C316 Open
TP21TP21
R321
2kJ
R321
2kJ
KEY319
SKQNABD010
KEY319
SKQNABD010
TP35TP35 TP28TP28
R336 1kJ
R340
2kJ
R340
2kJ
KEY320
SKQNABD010
KEY320
SKQNABD010
KEY323
SKQNABD010
KEY323
SKQNABD010
D303 1SS133 D303 1SS133
R315 1kJ
R308 100JR308 100J
KEY308
SKQNABD010
KEY308
SKQNABD010
R311 100JR311 100J
C320 Open
KEY318
SKQNABD010
KEY318
SKQNABD010
KEY312
SKQNABD010
KEY312
SKQNABD010
KEY301
SKQNABD010
KEY301
SKQNABD010
TP31TP31 TP32TP32
KEY310 SKQNABD010 KEY310 SKQNABD010
D301 1SS133 D301 1SS133
TP23TP23
R342
2kJ
R342
2kJ
KEY303
SKQNABD010
KEY303
SKQNABD010
C335 Open C335 Open
R320
2kJ
R320
2kJ
R322
2kJ
R322
2kJ
KEY314
SKQNABD010
KEY314
SKQNABD010
IC302 74HC151 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
VCC
16
GND
8
KEY317
SKQNABD010
KEY317
SKQNABD010
R319
2kJ
R319
2kJ
C336 Open C336 Open
TP16TP16
TP34TP34
C321 0.1u
TP27TP27
R348 2kJ
C304 Open C304 Open
TP18TP18
KEY311
SKQNABD010
KEY311
SKQNABD010
R316 1kJ
R337 1kJ
TP20TP20
R314 100JR314 100J
R347
2kJ
Q306
KRC106S
Q306
KRC106S
1
2
3
C313 Open C313 Open
C315 47pF
TP30TP30
R341
2kJ
R341
2kJ
KEY309
SKQNABD010
KEY309
SKQNABD010
R346 2kJ
KEY305
SKQNABD010
KEY305
SKQNABD010
C337 Open C337 Open
KEY316
SKQNABD010
KEY316
SKQNABD010
R310 100JR310 100J
IC303
74HC238
IC303
74HC238
GND
8
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
VCC
16
TP22TP22
C314 Open C314 Open
KEY304
SKQNABD010
KEY304
SKQNABD010
C312 0.1u C312 0.1u
A A
B B
C C
D D
E E
4 4 3 3
2 2 1 1
OPERATION PWB (KEY / Buzzer section) (AL-2050CS) 2/3