NAD C 326BEE Service Manual page 18

KEY BOARD
+5V
R525 R524
10K
1.5K
THRM_SEN
D512
1N4148
Q513
MMBT5551
**C528
10uF 50V
+5V
R542
10K
D513
+22V
1N4148
R543 25 PC2
1K
C524
1W
0.1U
POWER_DOWN
50V 26 PC3
27 PC4
MP_DET
+5V
R526
POWER_ON
28 PC5
IC-ATMEGA48
10K
R527
2.2K
29 PC6
RESET
STANDBY
30 PD0
PROTECTION
Q514
MMBT5551
31 PD1
+5V
R536
10K
RELAY
32 PD2
R528
10K
IR_OUT
IR_IN
+5V
1
VOUT +5V
2
GND
VCC 3
C518
D515
0.1u
D-IR-KODENSHI
C521 C520
47U
0.1u
16V
MUTE
** One must add C528 to correct false "Protect" if not installed.
+5V
J506
ISP HEADER
KEY05
1
2
KEY06
3
KEY04
4
5
RESET
C527 6
0.1u
+5V
R533
10K
C513
0.1u
C514
47U
16V
R523
0
S501 S502
CD VIDEO
16 KEY05
PB4
S504 S505
KEY04
15
PB3
TUNER AUX
KEY03
14
PB2
U503
S507 S508
KEY02
13
PB1
DISC TAPE
KEY01
12
PB0
4094_STB
11
PD7 +5V
10 4094_DATA
PD6
9 4094_CLK
PD5
1
STROBE
2
DATA
3 CLOCK
+5V
15 O/P_ENABLE
C515
C511
0.1u 0.1u
R539
10M
X501
20MHz
C517 C522
33P 33P
+5V
1
STROBE
2 DATA
3 CLOCK
15 O/P_ENABLE
C512
0.1u
+5V
R534 R535
10K 10K
S503
MP
+12V
S506
D511
TONE DEFEAT
1N4148
S509
R530
1K5
STANDBY
D502
VIDEO
U501
C505
C506
HCF4094B 10n 10n
VIDEO
4
Q1
R507 R505
TAPE
5
Q2
4K7 4K7
R508 R506
Q504
4K7 4K7
AUX MMBT5551
6
Q3
TUNER
7
Q4
DISC
14
Q5
MP_R
13
Q6
D507
MP_F
12 DISC
Q7
C510
C509
10n 10n
CD
11
Q8
9 R515 R513
QS Q508
MMBT5551
4K7
4K7
R516 R514
10
QS
4K7
4K7
U502
R545
HCF4094B
1K5
4 VOL-
Q1
5 VOL+
Q2
6 TONE
Q3
D506
TONE DEFEAT
7 BLUE
Q4
C523
10n
14 AMBER
Q5
R540 R541
Q515
13 RED
Q6
MMBT5551
4K7 4K7
12 Q511
Q7
DTA114EKA
11
Q8
R520 2K2
9
QS
10
QS R521 2K2
R522 2K2
18
R544
1K5
D508 D504
D505
AUX TAPE TUNER
C504
C503
10n
10n
R503 R501
4K7 4K7
R504 R502
Q503 Q502 Q501
4K7 4K7
MMBT5551 MMBT5551 MMBT5551
MP
D503
D501
CD
D510
C507
C508
D509
1N4148
10n 10n
1N4148
R511 R509
Q507
Q506 Q505
MMBT5551 MMBT5551 MMBT5551
4K7 4K7
R512 R510
4K7 4K7
+5V
Q510 Q509
DTA114EKA DTA114EKA
R532
10K
+12V
J501A
VI
10
D517 AU
9
SOFT CLIPPING
TA
8
TU
7
DI
6
C
5
MPR
4
3
2
IR_OUT
1
IR_IN
TO MAIN J501B
J504A
TO HEADPHONE BOARD J504B
1
MP_DET
2
+5V
J507A
TO MAIN J507B
SOFT_CLIPPING
6
5
MUTE
4
STANDBY
3
PROTECTION
2
1
J506A
TO MAIN J506B
VOL-
7
VOL+
6
MPF
5
TONE_DEFEAT
4
3
THRM_SEN
2
RELAY
+22V 1
D516
4
B
R517 1K
R518 1K
2 C
R519 1K
O
C
1
R