Denon DRA-500AE, Service Manual

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12
DRA-700AE/700AEDAB/500AE
BA7626F (IC601) MAIN P.W.B. for 700AE, 700AEDAB model
M24C64 (IC 404) FRONT P.W.B.
Truth table
C D E V
OUT1
L L
∗
H L
∗
IN2
L H
∗
IN3
H H L IN4
H H H IN5
A B E
L L
∗
IN1
H L
∗
IN2
L H
∗
IN3
H H L IN4
H H H IN5
C D E V
OUT2
L L
∗
IN1
H L
∗
L H
∗
IN3
H H L IN4
H H H IN5
Note 1:
∗
indicates "don't care" (H or L).
Monitor OUT
Block diagram
IN5
IN1
CTL A
V
CC
V
CC
IN2
CTL B
V
OUT2
GND
GND
IN4
CTL E
CTL D
16
15
14
13
12
11
10
9
2
1
3
4
5
6
7
8
IN3
CTL C
logic
logic
6dB
6dB
Monitor OUT
SDA VSS
SCL
WC E1
E0 VCC
E2
1
2
3
4
8
7
6
5
Block Diagram
WC
E1
E0
Control Logic
High Voltage
Generator
I/O Shift Register
Address Register
and Counter
Data
Register
1 Page
X Decoder
Y
Decoder
SCL
SDA
E2