JVC VS-DT2000 Service Manual page 35

RPM6938-SV4 (IC801,IC812) : Remote control receiver
1. Block diagram
AMP
I/V
conversion
for
PD
trimming circuit
magnetic shield
STK411-290E (IC221) : Power amplifier
1. Terminal layout
1 22
2. Block diagram
+VH 17
D6
R4
TR1 TR2
TR6
C2
R2 C1
LIN
18
TR3
TR4 R5
-LIN 19
R6
NF1
20
R7 TR7
TR5
D1
R3
R51
12
TC74HCU04AP (IC251) : Inverter
1. Terminal layout & Block diagram
1A 1
1Y 2
2A 3
2Y 4
3A 5
3Y 6
GND 7
(TOP VIEW)
Vcc
22k
AGC
ohm
Comp
BPF
Detector
R14
TR21
TR9
TR11 TR23
R19
R9
TR20
TR8
TR12 TR24
TR10 TR22
TR19
C5
C6
R18
R8
16 10 14 1511
13
2. Truth table
INPUT
14 VCC
13 6A
12 6Y
11 5A
10 5Y
9 4A
8 4Y
VDD
OUT
GND
TR31
TR14 TR13
D7
R16
C3
TR16 TR15
R12
R15
R16
TR17
R17
R13
TR32
21 22 9
INPUT
A Y
L H
H L
VS-DT2000
R31
Comparator
D35
D31
D33
SUB
D32
D34
D36
Comparator
R32
1 +VH
3 NC
5 +VL comp
+VL
4
GND
2
-VL
7
6 -VL comp
-VH
8
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