Service Guide
SW-J2.1 1200
*Attention
Please follow the numbered sequence marked within parenthesis given in
individual
Flow chat in that this is the best-recommended sequence to rectify the problems.
1.2.1 No power
，
LED
（
indicator
）
unlighted
Problem
Analyze
and
identify
the
causes
Solutions
Version 1.0 Page 7 of 23
No power
，
LED
（
indicator
）
unlighted
Repair or replace
Defective transformer
Defective or damaged
AC cable, or power
switch
resolder or replace
Or caused by the following:
1. transformer secondary wire loosely connected with PT1 jack in
YM9660 2.1L AMP
.
2. Dry soldering of PT1 in
YM9660 2.1L AMP
3. Copper foil of
YM9660 2.1L AMP
PCB broken
4. G6 plug of the wired-control defectively connected or damaged
5. VR2 on the ym9660-2.1L CON PCB damaged or dry-soldered
6. JK2 on
YM9660 2.1L
PCB defective
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