1-7-10
T5553TR1
Repair method #2
Check the primary rectifying diodes (D603-D606) as
possible problems. Remove the above mentioned
parts and check them. Perform check according to the
step 1 and 2 of repair method #1 and check for defects
following parts, then if necessary replace with factory
originals.
R602 is open or not.
Q601, Q602, D607, D608 and D611 are short or not.
Repair method #3
The feedback circuit which is monitored by the output
of D613 105V may not work and this may be regarded
as a possible cause, remove IC601 (Photo Coupler),
diode (D620) and transistor (Q604) check for defects.
Repair method #4
Check control circuitly which is connecting to Pin 2
and 1 of Switching Transformer T601.
