8-1 A91H2TR
TROUBLESHOOTING
[ Power Supply Section ]
The power cannot be turned on.
The fuse blows out.
FLOW CHART NO.1
( Inverter Power CBA )
FLOW CHART NO.2
Is normal state restored when once un
plugged
power cord is plugged again several seconds?
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(C1205, D1205, D1206, D1207, D1208, Q1203,
Q1204, T1201)
Ye s
No
Ye s
Is the fuse (F1601) normal?
See FLOW CHART No.2 <The fuse blows out.>
No
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(D1601, IC1401, IC1702, Q1601, Q1602, Q1701,
Q1702, T1701)
No
Ye s
Is the AL+5V line voltage normal?
No
Is the PANEL+24V line voltage normal?
Ye s
Check each rectifying circuit of the secondary
circuit and service it if defective.
Check the presence that the primary component
is leaking or shorted and service it if defective.
Check the presence that the rectifying diode or circuit
is shorted in each rectifying circuit of secondar
y side,
and service it if defective.
After servicing, replace the fuse.
When the output voltage fluctuates.
FLOW CHART NO.3
Does the photocoupler circuit on the
secondary side operate normally?
No
Ye s
Check D1213, D1720, IC1202, IC1704 and their
periphery circuit, and service it if defective.
When buzz sound can be heard in the vicinity of power circuit.
FLOW CHART NO.4
Check if there is any short-circuit on the rectifying diode and the circ
uit in each rectifying circuit of the secondary side,
and service it if defective. (D1101, D1714, D1715, Q1101)
Check D1210, IC1202, IC1702, IC1704 and their
periphery, circuit and service it if defective.
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