Denon DCD-F109, Руководство по обслуживанию

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36
The key operation is not functioning.
When pressing each switches (S500-506), do the voltage of pin
(4),(5),(6),(99),(100) of IC11 decrease?
Are the contact point and the installation state of the key switches
(S500-506) normal?
Replace IC11.
Re-install the switches (S500-506) correctly or replace
the poor switch.
Check the switches (S500-506) and their periphery, and
service it if detective.
NO
NO
YES
YES
FLOW CHART NO.4
Is +3.3V_D voltage supplied to Pins(37) of FLT500?
Is the voltage of approxi42V supplied to Pin(38) of FLT500?
The fluorescent display tube does not light up.
Is the voltage of approxi3.3V(AC) supplied to Pin(1)-Pin(43)
of FLT500?
Check the fluorescent display tube control signal of ab microcomputer.
(FL_RST,FL_CS,FL_CLK,FL_MDT)
Check the +3.3V_D line and service it if defective.
Check D619,D620,ZD605,ZD606,Q608 and the periphery
circuit, and service it if defective.
NO
NO
Check the FL1/FL2 line and service it if defective.
NO
YES
YES
YES
FLOW CHART NO.3