FLOW CHART NO.4
The fluorescent display tube does not light up.
㸣
Is +3.3V_D. voltage supplied to Pins(37) of F701? 㸢No Check the +3.3V_D. line and service it if defective.
㸣Yes
Is the voltage of approximately +42V supplied to
Pin(38) of F701?
㸢No Check the +42V line and service it if defective.
㸣Yes
Is the voltage of approximately +7V supplied to
Pin(1),(43) of F701?
㸢No Check the FL1/FL2 line and service it if defective.
㸣Yes
Check the fluorescent display tube control signal of a
microcomputer. (FL_RST,FL_CS,FL_CLK,FL_MDT)
FLOW CHART NO.5
+42V is not outputted.
㸣
Is approximately +42V voltage supplied to the kathode
of D812?
㸢No
Check D812, D813 and periphery circuit, and service it if
defective.
㸣Yes
Check if there is any leak or short-circuit on the loaded
circuit, and service it if defective.
FLOW CHART NO.6
The key operation is not functioning.
㸣
Are the contact point and the installation state of the
key switches (S701-708) normal?
㸢No
Re-install the switches (S701-708) correctly or replace the
poor switch.
㸣Yes
When pressing each switches (S701-708), do the
voltage of pin (5),(6),(99),(100) of IC11 decrease?
㸢No
Check the switches (S701-708) and their periphery, and
service it if detective.
㸣Yes
Replace IC11.
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