Durabrand DTV1307 - Troubleshooting Guide

TROUBLESHOOTING GUIDE
NO POWER
Yes
Is the voltage at the point (A)
in the Figure DC144V ?
E-1
Is the voltage at pin G
of Q502 DC5V ?
Yes
No
Broken wire of R511 or short circuit
on GND.
Check the rectifying circuit.
Yes
No
Yes
No
Is the voltage at the point (B)
in the Figure DC164V ?
Is the voltage at the point (C)
in the Figure AC120V ?
Yes
No
Broken wire of L501.
Is the voltage on both
ends of S501 AC120V ?
Broken wire of F501.
Yes
No
Broken wire of AC cord or check
S501.
Is the voltage at the point (E)
in the Figure AC120V ?
Check Q503 and associated circuit.
Check Q502 and associated circuit.
No
T501
6
R520
8
A
D
S
G
3
Q503
Q502
IC501
R519
R511
B
D502~D505
L501
C
E
F501
S501
CD501