Electrical Troubleshooting Guide - Aiwa HT-DV2300 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE -10/10

ELECTRICAL TROUBLESHOOTING GUIDE -
QQ
3 7 63 1515 0
D.
CHECK A
Fig.5. RF
waveform
Check RF Eye-Pattern.
RF : 1.5-1.6V(Q2A6 collector)
YES
See the eye-pattern vivid?
YES
TE
L 13942296513
• Check IC201 Pin 105.
• Check the clock at the IC201 Pins 138.
END
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NO
Check IC2A1 Pins 47, 50, 51, 52.
Does the
NO
sawtooth waveform emit
at IC2A1 Pin 36?
YES
Replace IC201.
• Both are normal : IC201 is defective
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2 9
8
No signal: Pick-up is defective
NO
Does the 1.6V emit?
Check IC201 Pin84.
No signal at IC201 : IC201 is defective
Q Q
3 6 7 1 3 1 5
co
.
-67-
9 4 2 8
NO
Replace IC2A1.
YES
0 5 8 2 9 9 4 2 8
m
9 9
9 9