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5-1. Troubleshooting Guide.
NOTES ;
1. If picture does not appear, fully rotate the brightness and contrast controls
clockwise.
2. Check the following circuits.
No raster appear : power circuit. Horizontal output circuit.
High voltage control circuit and output circuit.
High voltage develops but no raster appears : Video output circuit.
High voltage does not develop : Horizontal output circuit.
5. TROUBLESHOOTING GUIDE
No Power
Check the other secondary
o200V,+80V,+14V,
-14V,+12V,+6.3V ,5V Lines)
Does each output appear?
M80V output between
cathode of D120 and Ground.
Does appear 80V DC?
Check and replace
F801,D801,IC811,IC812
Check and replace
D115,D121,D120
D107,IC103,IC101
Check Video and
Horizontal circuits
5-1-1. No Raster, No Video
NO
YES
Check S1,S2,S3,S4 signals refer to
S-correction table on the schematic
S1,S2,S3,S4 signal are right
at each frequency block
Check and replace
Check and replace
Q307,309,311,313,306,308,310,312
YES
NO
5-1-2 S-Correction failure.
C/S TABLE
S1 S2
S3
S4
1
~31K
L
L
L
L
2
34~36K
L
L
H
H
3
37~42K
L
H
L
H
4
43~50K
H
L
H
H
5
51~58K
H
H
L
L
6
59~66K
H
H
L
H
7
67~73K
H
H
H
L
8
74K~
H
H
H
H
IC106 1pin
