S-W1EX
42
1
2
3
4
1
2
3
4
C
D
F
A
B
E
7.2 SMPS BLOCK TROUBLE SHOOTING
SMPS section repair flow
Power On LED does not light up
Yes
Yes
Yes
Yes
No
No
No
No
The signal is output.
Fuse(FU1) has been blown.
IC is very hot.
Are + 47V and
±
12V output O.K.?
Failure in the amplifier section.
TO AMP part
+47V output O.K.,
±
12V output NG
to 2
to 3
AA
+47V output NG
+
_12V Output NG
Case1
Case2
+12V O.K and -12V NG
-12V O.K and +12V NG
When FU1 Has not been blown.
Separate the amplifier section.
Check the connecting cable and solder bridge of LED ASSY.
∗
In AXW7007, when VA1 is damaged, replace FU1
and VA1 with new one.
Check if there is a solder bridge on the SMPS Assy,
and replace FU1, IC1, and D13 with new ones.
Disconnect the AC power cord, and let the unit stand until
any hot ICs have cooled down. Once the ICs are cool
enough, turn on the unit and check the operations.
Check whether or not there is a solder bridge,
and replace D33 and IC33 with new ones.
Check whether or not there is a solder
bridge, and replace D32, D34, and IC32
with new ones.
If the failure in the power-supply section
is not corrected even after replacement
of corresponding parts, go to 3.
*
