Table of Contents
6. PROTECTION
6-1. Protection-1
6-1-1. Solution
Replace IC701, IC702 (AMP IC) on MAIN board.
6-1-2. How to troubleshoot (Countermeasure)
1) After MAIN SET power off, check Red LED blink at intervals of 1 sec.
2) Turn MAIN SET power on again.
3) Check PVDD voltage (21 V) of PN601 pin1, 2.
- If PVDD voltage has 6.0 V under, refer to SMPS board repair guide.
4) Check SVCC33 voltage (3.3 V) of IC701, IC702 pin13, 27.
- If SVCC33 voltage has 2.7 V under, refer to 3.3 V no power repair guide.
5) Check impedance (4 Ω) of speaker unit.
- If impedance of speaker unit has 2 Ω under, replace speaker unit .
6) If check point 3), 4), 5) is OK, replace IC701, IC702 (AMP IC) on MAIN bottom board.
6-1-3. Service hint (Any picture / Remark)
PN261
Bt Module
R912
PN701
0V
PN601
PN601
0V
R758
21V
21V
PN601
R757
POWER
PN702
Q754
R767
C605
PN703
L601
C606
IC604
AP6503
ONE POINT REPAIR GUIDE
IC921
C928
PCM1808
C720
C708
C722
C757
Assy No
0036A
C735
C761
0036B
C744
C723
C743
< MAIN board top view >
IC701
IC701
(AMP IC)
(AMP IC)
< MAIN board bottom view >
R203
C206
C223
C701
option
R701
R717
R104
R103
C704
C103
R106
R107
R105
R704
R716
R108
R111
R714
R109
R123
R715
R121
( )
R126
R124
CHECK
R128
R131
R132 R133
R146
R129
R137
C703
R733
R721
R184
C752
R722
R732
Rev 2.0
R177
R179
R735
R729
AMP SDA
GD
AMP SCL
L602
IC702
IC702
(AMP IC)
(AMP IC)
3-7
C148
Q661
R189
R661
R19H
1
10
15
5
A
E
IC101
MLC3730S
K
R180
R
R151
C128
R167
X101
24M
C126
PN110
IC106
To Touch Led
APX809
C612
C634
C613
L603
C142
C143
C144
C145
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