4. FLD DISPLAY CHECK
FLD DISPLAY CHECK
OK
YES
Check
CN501 Pin13,14,15 input
voltage.
YES
Check if both end voltage
of FL+, FL- are over 2.9 V
VKK : over 25.6 V.
NO
Refer to SMPS troubleshooting.
YES
Check CN301
connection and power
Pin1, 2, 3(FL+, FL-, VKK),
Pin8(5.6 V).
YES
OK
NO
Check CN301 connection.
YES
Check each
Pin voltage.
YES
Check
IC301(MC3401) voltage
Pin30 VKK: -25.8 V
Pin13, 43: 3.3 V.
YES
Check
IC501->IC301
data communication
STB/ DATA/ CLK
FLD light on?
OK
NO
If voltage is not 3.4 V.
YES
Check IC301.
YES
NO
Replace IC301.
NO
Check input data
IC501 Pin F1,F2,G1.
YES
OK
Check IC501
.
YES
NO
Replace IC501.
Check output data IC501 Pin D2.
YES
YES
YES
3-21
AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
Содержание CM4550
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