FLOW CHART NO.1
The power cannot be turned on.
㸣
Is Power LED lit? 㸢No
㸣Yes
Is the +3.3V_NSW line voltage normal? 㸢No
㸣Yes
Is the fuse normal? 㸢No See FLOW CHART No.2 <The fuse blows out.>
㸣Yes
Is normal state restored when once unplugged power
cord is plugged again after several seconds?
㸢No
㸣Yes
Is the ST+5V line voltage normal? 㸢No
㸣Yes
Check each voltage regulator circuit and service it if
defective.
FLOW CHART NO.2
The fuse blows out.
㸣
㸣
After servicing, replace the fuse.
FLOW CHART NO.3
+3.3V_D is not outputted.
㸣
Is +5V_D voltage supplied to Pin(1) of IC85? 㸢No
Check IC84 and the periphery circuit, and service it if
defective.
㸣Yes
Check IC85 and the periphery circuit, and service it if
defective.
Check if there is any leak or short-circuiting on rectifier
circuit of MAIN Power transformer, and service it if
defective.
(MAIN TRANS,D807,IC84)
Check if there is any leak or short-circuiting on rectifier
circuit of MAIN Power transformer, and service it if
defective.
(D807,IC84,IC83,D801,D802,D803,D804,IC81,IC82)
Check if there is any leak or short-circuiting rectifier circuit
of SUB Power transformer, and service it if defective.
(T801, D818, D819, D820,
D821,D822,D823,IC86,Q805,Q806)
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