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TROUBLESHOOTING GUIDE
C834
R857
D805, D803, ZD804, Q801
3
Q04,Q851,Q852,Q853,IC802,IC804 41
8 IC507
IC01,IC301,FR440,FR441, D406,FR436,Q804,Q805.
8.0V D407,D408.
IC507.
75V
R405, D811, FR848.
135V
D813,R811,R812,T403,Q402,L801. Q401, Q402, T401.
FR459, FR901.
61
20~25, 28~29
10~17 IC503. Q205, IC201.
IC503. 29~30, 32~37 IC504.
Check the waveform
IC504. at pin 54~61 of IC507.
Check/Replace IC507,
Check/Replace IC507.
Q502~Q510.
1, 6 IC301.
FR440,FR441,D407,D408. 19, 20 IC507.
IC507, Q501, Q514. IC301, D301.
PIN CUSHION
21 IC507.
IC507. IC401
IC401 R424.
Q404, Q405. D402.
12 IC701.
2.4V
IC701, X701. 6
Q701. 35,36,37 IC507.
IC507.
Check the waveform
at pin 9 of P504B.
NORMAL
Check/Replace Q2001~Q2003,
IC507,Q511~Q513. IC2001,D2008~D2009.
31V
FR852, D814.
FR848,D811,FR829,ZD103.
IC102, R110 .
61
19
IC201,Q203,Q204,IC204.
IC03
NO VGA
Check the waveform
at pin 52, 60 of IC501.
NO NORMAL
Check/Replace Check the waveform
VGA01. at pin 31, 32, 33 of IC507.
NO NORMAL
Check/Replace Check/Replace
VGA01. IC507.
NO COMPONENT
Check the voltage
at pin 44 of IC01.
0V 5V
Check/Replace Check the waveform
IC01. at pin 10~13 of IC203.
NO NORMAL
Check the waveform Check/Replace
at pin 6~8 of IC203. IC503.
NO NORMAL
Check/Replace Check/Replace
Q202, Q208, Q209. IC203.
ADJUSTMENT INSTRUCTIONS
Y Safety Precautions : SECAM-L' Adjustment
1. It is safe to adjust after using insulating transformer between
the power supply line and chassis input to prevent the risk of NOTE : This adjustment should be performed after PIF
electric shock and protect the instrument. adjustment.
2. Never disconnect leads while the TV receiver is on.
3. Don't short any portion of circuits while power is on. Test Point : TP1
4. The adjustment must be done by the correct appliances.
5. Unless otherwise noted, set the line voltage to 230Vac!10%, Adjust : VR102
50Hz.
1) Turn on S1 and S3 and off S2.
Y Test Equipment required 2) Adjust VR102 so that the DC voltage may be indicated
1. RF signal generator (with pattern generator)
2.5!0.1Vdc.
2. DC Power Supply
3. Multimeter (volt meter)
4. Oscilloscope
5. Color analyzer
: RF AGC (Automatic Gain Control) Adjustment
Main Board(Component side view) Test Point : J209 or Observing Display
Adjust : VR101
V Multimeter or Oscilloscope
1 The RF AGC control (VR101) was aligned at the time of
IC101 manufacture for optimum performance over a wide range
Power- JP7 IC05
TDA4474
Supply conditions. Readjustment of VR101 should not be necessary
JP4 IC102 TP1 24 Signal-
5V 0.01pF Generator unless unusual local conditions exist, such as ;
5V 7 JP1 38.9MHz (B/G,D/K,I,L)
L107
11 JP2 34.25MHz (SECAM-L') 1) Channel interference in a CATV system.
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