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IC Block Diagrams
IC3701 < Audio Control & Surround > NJW1142M
MONa
5
IN 1a
1
IN 2a
2
SEL
3
IN 3a
IN 4a
4
IN 1b
30
IN 2b
29
SEL
IN 3b
28
IN 4b
27
26
MONb
IC281 < Secam Decoder > LA7642NM-TLM-E
N.C.
EQU-Adj
Vcc
20
19
18
ACC
Bell/EQU
Adj
1
2
3
F0-Fil
Kil-Fil
N.C.
Service Information
I Protection Circuit
This TV set has a built-in power supply protection circuit.
It is provided to protect the TV set in case of a power supply circuit malfunctions. When something abnormality
occurs during TV reception, the TV set goes to the stand-by mode.
When an abnormality occurs during TV reception, it causes pin 27 of the CPU to go continually Low for about
one second. The CPU detects that this has occurred and outputs the signal from pin 31 to switch off the power
supply lines.
Releasing the protective circuit and restoring power supply
To release the protective circuit and restore power supply, turn the power to the TV set OFF and then ON again
via either the main power switch or the ON-OFF button on the remote control. This will work only if the power
supply trouble was temporary. If there is permanent trouble such as a damaged circuit, power cannot be
restored and the circuit will have to be repaired.
All manuals and user guides at all-guides.com
SR-FIL
AGC
6
20
VOL 1
NJRC
ORIGINAL
SURROUND
AGC
&
SIMULATED
STEREO
VOL 1
AV/SECAM
Video In
Kil-Out
4.43MHz In
17
16
15
14
System
SW3
Bell/EQU
PLL
SW1
Filter
DET
KILLER
LIM
F0 Adj
ID-KIL
ID
4
5
6
7
4.43DC
ID-Fil
4M-DC
R-Y Out
TONE Ha
TONE La
7
8
TONE
VOL 2
VOL 2
TONE
23
24
TONE Hb
TONE Lb
N.C.
SC-In
4MHz In
13
12
11
Pulse
SW2
DET
VCO
Pulse
I/F
Filter
Clamp
SW/ALC
8
9
10
GND
N.C.
B-Y Out
-8-
LINEa
OUT a
10
9
IIC BUS
INTERFACE
BIAS
21
22
17
VREF
OUT b
LINEb
13
SDA
14
SCL
11
CVa
12
CVb
19
CTH
18
CTL
25
CSR
15
GND
16
V+
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