Yamaha HTR-5920 Manuel d'entretien - Page 10

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Yamaha HTR-5920 Manuel d'entretien
HTR-5920
I MAINTENANCE FLOW CHART
• FRONT P.C.B.
Is FL display
YES
Are all keys
on front panel
YES
10
Start
Power on
NO
turns on?
NO
work well?
A
Is connection
NO
of cable
correct?
YES
Are voltages
NO
of BN82 (pin 1
to 4) correct?
YES
Are waveforms
NO
of IC81 (pin 34 to 67)
correct?
YES
Check and replace
FL display
Is power voltage
NO
of each board
correct?
YES
Are input ports
NO
of IC81 (pin76 to 78)
work correct?
YES
Check and replace IC81
Check connection
of cable
Check power supply
of BN82
Check and replace
IC81
Check
power supply part
Check KEY IN part
(S851-854, S858-863,
S865-871)