Read Sony CDC-R937 / CDC-X937 Service Manual online
18
CDC-R937/X937
• IC901 µPD178078GF-588-3BA (SYSTEM CONTROL) (MAIN BOARD) (CDC-R937)
• IC901 µPD178076GF-571-3BA (SYSTEM CONTROL) (MAIN BOARD) (CDC-X937)
• IC901 µPD178076GF-571-3BA (SYSTEM CONTROL) (MAIN BOARD) (CDC-X937)
Pin No.
Pin Name
I/O
Pin Description
1
BATT IN
I
Battery signal input
2
DFP IN
I
Front panel with/without detect signal input
3
LCD DI
I
LCD serial data signal input
4
LCD DO
O
LCD serial data signal output
5
LCD CLO
O
LCD sync clock signal output
6
LCD CE
O
LCD driver CE signal output
7
BBE SW1
O
BBE on/off select signal output
8
CDS DI
I
CDS serial data signal input
9
CDS DO
O
CDS serial data signal output
10
CDS CLO
O
CDS sync clock signal output
11 – 15
NC
O
Not used. (Open)
16
BBE SW2
O
BBE effectiveness select signal output
17
NC
O
Not used. (Open)
18
EVOL CLO
O
Clock signal output to electronic volume
19
EVOL DO
O
Serial data signal output to electronic volume
20
EVOL CE
O
CE signal output to electronic volume
21
LOC/DX
O
LOC/DX select signal output
22
DSSA CONT
O
DSSA control signal output “H”: DSSA L/R
23
ACC DET
I
Power supply overvoltage detect signal input
24
PH MUTE
I
External mute control signal input
25
LEV.IND.
I
Level signal input
26
TEST
—
CDS test mode pin
27
AVDD
—
Power supply pin (+5 V)
28 – 30
KEY1 – KEY3
I
A/D key signal input
31
FM/AM S M
I
CDC-R937: RDS AF signal input CDC-X937: FM/AM S meter signal input
32
AVSS
—
Ground pin
33
REG CPU
—
Regulator for CPU power supply
34
VDD
—
Power supply pin (+5 V)
35
REG OSC
—
Regulator for oscillator circuit
36
X OUT
O
System clock oscillator output (6.3 MHz)
37
X IN
I
System clock oscillator input (6.3 MHz)
38
GND0
—
Ground pin
39
IF REQ
O
IF count signal request output
40
GND2
—
Ground pin
41
AM IF
I
AM IF count signal input
42
FM IF
I
FM IF count signal input
43
VDD PLL
—
Power supply pin for PLL (+5 V)
44
FM OSC
I
FM local oscillator signal input
45
AM OSC
I
AM local oscillator signal input
46
GND PLL
—
Ground pin for PLL
47
EO 0
O
Error out signal output from charge pomp
48
EO 1
O
Error out signal output from charge pomp
49
IC
—
Not used. (Connect to ground.)
50
RESET
I
System reset signal input
51
RDS CL IN
I
CDC-R937: RDS clock signal input CDC-X937: Not used. (Open)
52
ACC IN
I
ACC on/off detect signal input
53
RMT IN
I
Remote control signal input
54
ST IN/SD IN
I
FM receive stereo signal input
55
ST
O
CDC-X937: FM receive forced monaural change over signal output
CDC-R937: Not used. (Open)
56
ST BY MUTE
O
ST-BY mute control signal output to power IC
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