3-7 (E)
PVM-A250
2. State in which D6228, D6407, D6408, and D6229 were turned off
28 V is not output. When 28 V is not output, 12.5 V is not also output and all LEDs are turned off.
A primary power circuit (AC input to 28 V insulating converter) is judged to be abnormal.
Confirm the following item using a tester.
. Is PFC properly output?
(In a normal state, the voltages across C6030 or C6031 are approximately 395 V.)
8 Yes
Abnormality may exist in a main converter. Confirm the parts below and replace them as required.
. Q6205 and Q6206: Is no problem found in the resistance value between terminals? (Are Q6205
and Q6206 not short-circuited?)
. R6201: Is no problem found in a resistance value? (Is R6201 not put into an open
state?)
. IC6201
8 No
Abnormality may exist in a power-factor improvement regulator. Confirm the parts below and
replace them as required.
. Q6001 and Q6003: Is no problem found in the resistance value between terminals? (Are Q6001
and Q6003 not short-circuited?)
. F6000: Is F6000 not put into an open state?
. IC6000
Abnormality may exist in a sub-power regulator. Confirm the parts below and replace them as
required.
. R6208: Is no problem found in a resistance value? (Is R6208 not put into an open state?)
. IC6200
Abnormality may exist in a rectifier circuit. Confirm the parts below and replace them as required.
. F6000: Is F6000 not put into an open state?
. D6000: Is D6000 not put into an open state or not short-circuited?
3. State in which D6228 was turned on and in which D6407, D6408, and D6229 were
turned off
12.5 V is not output.
A secondary DC/DC converter is judged to be abnormal. Confirm the parts below and replace them as
required.
. F6400: Is F6400 not put into an open state?
. Q6404 to Q6407: Is no problem found in the resistance value between terminals? (Are Q6404 to
Q6407 not short-circuited?)
. IC6401
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