TROUBLE SHOOTING CHARTS
Step
Check Point
Condition
Rem ark
Yes
No
1
C heck fuse
next step
R eplace fuse
250V 6.3A
2
C heck bridge diode
next step
R eplace D 801
3
C heck D C Voltage(8V over)
next step
C heck/replace R 802,R 804,R 805
4
C heck ripple voltage(1.5V under)
next step
C heck/replace C 809
5
C heck voltage #1 (T 801)
next step
C heck D 802~D 804,
replace I801
167.4Vrm s
6
C heck 132V dc
next step
C heck /replaceY 801,I806,
Q 802,R 818,Q 801,D 806
7
C heck 33V dc
next step
C heck/replace R 416,D 103
C heck tuner
8
C heck voltage #17 (I701)
next step
C heck/replace R 403,R 404,
R 405
0.6V under
9
C heck voltage (132V dc)
next step
C heck/replace Q 401,R 401
10
C heck voltage #28,#36 (I501)
next step
C heck/replace
R 206,D 203,I805
#28 : 9V
#36 : 5V
11
C heck voltage #32 (I501)
next step
C heck R C 422,R 426,Q 402
4V
12
C heck Voltage of C 405(+)
next step
C heck /replace R 410,R 411,
R 412,R 421
13
C heck Q 403 C ollector
next step
C heck/replace
Q 403,D 401,D402,D 403
1120V
14
H eater voltage is 6.3Vrm s?
next step
C heck/replace R 915,R 916
15
C heck 210V dc
next step
C heck/replace R 417,D 410
16
C heck voltage #9 (I506 )
next step
R eplace I506
9V
17
C heck 13V dc
next step
C heck/replace R 419,D 406
18
C heck 26.5V dc
R eplace/replace R 418,D 407
Summary of Contents for DTH-25G1FST/FSP/FS
Page 1: ......
Page 7: ...BLOCK DIAGRAM...
Page 25: ...TROUBLE SHOOTING CHARTS 1 NO POWER...
Page 61: ...EXPLODED VIEW DTH 29G3...
Page 62: ...EXPLODED VIEW DTH 29G5...
