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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
o250V,+130V,+80V,+12V,
-12V,+12V,+6.3V ,5V Lines)
Does each output appear?
M80V output between
cathode of D110 and Ground.
Does appear 80V DC?
Check and replace
F101,IC103
Check and replace
D104,D105,D106
D108,IC103,IC101
Check Video and
Horizontal circuits
5-2-1. No Raster, No Video
NO
YES
Check S1,S2,S3 signals refer to
S-correction table on the schematic
S1,S2,S3 signal are right
at each frequency block
Check and replace
Check and replace
Q704,707,709,703,706,708
YES
NO
5-2-2 S-Correction failure.
C/S TABLE
S1 S2
S3
1
~17K
L
L
L
2
17~28K
L
L
H
3
29~34K
L
H
H
4
34~40K
H
H
H
IC103 1pin