1-9-1
E5W21TR
TROUBLESHOOTING
Yes
No
FLOW CHART NO.5
The key operation is not functioning.
Are the contact point and the installation state
of the key switches (SW1201-SW1204) normal?
When pressing each switches (SW1201-SW1204),
do the voltage of Pin(4) of CN1201 increase?
Check the switches (SW1201-SW1204) and their
periphery, and service it if detective.
No
Re-install the switches (SW1201-SW1204)
correctly or replace the poor switch.
Replace BD Main CBA Unit.
Yes
FLOW CHART NO.2
The fuse blows out.
After servicing, replace the fuse.
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
secondary side, and service it if defective.
FLOW CHART NO.3
When the output voltage fluctuates.
Yes
No
FLOW CHART NO.4
When buzz sound can be heard in the vicinity of power circuit.
Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary
side, and service it if defective. (D1011, D1012)
Does the photo coupler circuit on the secondary
side operate normally?
Check IC1003, D1006, D1009 and their periphery,
and service it if defective.
Check IC1003, IC1011, D1010 and their periphery,
and service it if defective.
FLOW CHART NO.1
The power cannot be turned on.
Is the fuse normal?
Is normal state restored when once unplugged
power cord is plugged again after several seconds?
Is the EV+11V line voltage normal?
See FLOW CHART No.2 <The fuse blows out.>
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(IC1001,Q1001, Q1002, T1001, D1001, D1002,
D1003, D1004, D1007, C1010, R1013)
Check each rectifying circuit of the secondary
circuit and service it if defective.
Yes
Yes
Yes
No
No
No
