Haier 21F3A-T Service Manual page 18

A3. Error Detection Process
1.
Check VD503~VD506,
C507, V513, etc.
Check to see if the
collector voltage of V552
Normal
Check to see
if , 9v,
5v is normal
Normal
The failure of horizontal
The failure ofhorizontal unit
unit orN204
orN204
No light and sound
Check to see if
Fuse is normal
Normal
Normal
is 27V
Abnormal
Check the control
voltage of V572 or
CPU power pin
Abnormal
Check
N902,V905,ect
Maintenance Service and Trouble shooting
Abnormal
Check to see 110V、180V
etc. voltage is normal
Abnormal
T est to see all terminal
Resistance of load
Normal
Check to see if
Check switch
rectifying tube
power unit
Normal
Check the
Loader
17
Abnormal
is normal
Abnormal
Change
rectifying diode