Trouble Shooting - Samsung DVD-R157 Service Manual

5. Trouble Shooting

NO Power Detected
PQIZ1[Pin 5]?(Over 10V)
Samsung Electronics
(Stand by LED OFF)
PAFT1 is normal?
Yes
PADT1~PADT4
SHORT and OPEN
Are normal?
Yes
Is there voitage at
Yes
Operation of PQIZ1 is
Normal?
Yes
Check feed back
PQIZ1[PIN 3] Is 5.8V
No
Change fuse
No Change short circuited or
opened parts
No
Change PQIZ1 IC.
No
Replace PQIZ1
5-1