Service manual

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❏ ELECTRICAL TROUBLESHOOTING GUIDE
■ AUDIO PART
P-SENS PART CHECK
ZD 901(5V) Voltage check
IC301 6PIN PATTERN Check
Half-wave rectification wave form check
R783 check, then ZD901 replacement
D713 Replacement
VKK CHECK
CN302 28pin DC -33V check
IC301 87PIN check
ZD902 -33V check
Q903 turn on check
Pattern disconnection check
D912, D911 replacement
normal
ZD902 replacement
Refer to power
supply check
C916 -33V and less check
Q903 replacement
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO