NAD T 562 Service Manual page 24

KEYBOARD AND DISPLAY
J301
FROM PSU
VF+
5
VF-
4
-20V 3
5V
GND
2
+5V 1
C301
C302
10UF/16V
10UF/50V
GND GND GND
U301
20U39119BAN
35
F2B
34
F2A
32 P16
P16
31
P15
P15
30
P14
P14
29
P13
P13
28
NC7
27 P12
P12
26
P11
P11
25 P10
P10
24
P9
P9
23
NC6
22
NC5
21
P8
P8
20 P7
P7
D311
19
P6 POWER
P6
18 P5
P5
17
NC4
16
NC3
15 P4
P4
14
P3
P3
13 P2
P2
12
P1
P1
11
NC2
10
G1
1G D313
9
G2
2G
8
P- SCAN
NC1
7
G3
3G
6 G4
4G
D314
5
G5
5G
4 G6
HDCD
6G
2 GND
F1B
1
F1A
5V
R316 10K
R315 10K
R314 10K
J303
R313 10K
FROM DECODE
1
GND
2
DOUT
DIN 3
4
CLK
STB 5
6
GND
7
IR
GND
WAKEUP 8
R323
3
47R
2
IR Receiver
1
C311
U303
220UF/10v
HS0038B
GND
J304
FROM AUD
IR
1
+5V 2
NA 3
4
SW
TRG 5
GND 6
GND
C303
0.1uF/50V
GND
G1
G2
G3 34 22 P9
GRID4 SEG8
35 21
G4 P10
GRID3 SEG7
G5 36 20 P11
GRID2 SEG6/KS6
37 19
G6 P12
GRID1 SEG5/KS5
38 18
P13
VDD SEG4/KS4
LD4 39 17 P14
LED4 SEG3/KS3
40 16
P15
LED3 SEG2/KS2
UPD16312
LD2 41 15 P16
R317 LED2 SEG1/KS1
42 14
LD1
LED1 VDD
1K 43 13
VSS KEY4
44 12
R318 OSC KEY3
470
U302
R302
47K
R312
5V
470
GND
R301
470
GND
R308
C309 C310
C307 C308
10K
100PF 100PF 100PF 100PF
GND
R321 NA 10K
R322
10K
P12
P13
P14
P15
P16
KS3
KS1 KS2
D301 D302 D303
IN4148
IN4148 IN4148
5V
SW302 SW303
OPEN/CLOSE PLAY
KEY4
SW307 SW308 SW309
PAUSE STOP
MENU
KEY3
SW313 SW314 SW315
SKIP- PRO-SCAN
SKIP+
KEY2
SW319 SW320 SW322
SCAN+ SCAN-
ENTER
KEY1
D307
R304
IN4148
1K
C304
R306
R309 R310 R311
10K 10K 10K
100R
0.1uF/50V
C305
0.1uF/50V
GND
Falling Edge Interrupt Signal
WAKEUP/INTERRUPT CIRCULT
KS4 KS5
D305
D304
IN4148
IN4148
SW310 SW311
DOWN
UP
SW316 SW317
LEFT
RIGHT
5V
R305
R303
10K
10K
Q301
C1815
R307
47K
C306
100P
GND