Pioneer SX-315 Service Manual page 44

1
Symptoms
A
Does
Yes
an F801 (main
fuse) blow
out?
Are
R801 and R802
(0.22Ω, 1W) open
circuited?
B
Are
R803 and R804
(0.22Ω, 1W) open
circuited?
Does
C
IC806 (ICP-N15)
open circuited?
D
E
F
44
1
2
Diagnosis description
• The wires of primary and secondary sides of the main transformer are short-circuited.
Transformer is in failure.
• BD501 and BD502 are in failure.
• Power transistors are in failure (short-circuited).
• D801 and D802 are in failure.
Yes
• IC801 is in failure.
• Short-circuiting of these peripheral circuits.
• D803-D806 are in failure.
Yes
• IC802 and IC803 are in failure.
• Short-circuiting of these peripheral circuits.
Yes
• IC805 is in failure or its peripheral circuits are short-circuited.
2
3
SX-315
3
4
4