Trouble Shooting Guides - Sampo SME-23DL3 Series Service Manual

TROUBLE SHOOTING GUIDES

STAND-BY POWER
!
!
!
!
!
!
Lower than 31 † † † † 4V
!
!
Check ZD781
!
!
!
!
!
Check over load
!
protection circuit. Is
!
R781,Q781,C782 good ƒ ƒ ƒ ƒ
!
!
YES
!
Check output
!
stage
!
!
!
!
Output voltage abnormal
Compare V C789=31V † † † † 4V Check
output Voltage at C789
No output
Over load
YES
NO
Replace
abnormal parts
Higher than 31 † † † † 4V
Check R788,C788
NO
Check Voltage at C709(+)
Normal
Check D789
- 7-1-
Abnormal
Check
F701, Q781,Z
D781, BR701
VER 1.0