Psw-D115 Power Amp Module Testing Flow Chart - JBL PSW-D115 Service Manual

Amplifier/Subwoofer

PSW-D115 POWER AMP MODULE TESTING FLOW CHART

START
Resistance
check
between V+
V- and O/P
O/P to GND
should > 5K
No
OK
Yes
Power up with
no signal I/P
LED RED
No
OK
Yes
Check I/P of
module to
GND 0V D.C.
No
OK
Yes
Check
switching
frequency
100KHz
H
+/-10%
~1Vpp
No
OK
Yes
Power AMP
OK
END
Replace
Module
Check fuse
transformer,
CMC,
rectifier, C1,
C2
Check C29
and Pre-AMP
Check V+,
V-, +/-15V
voltage to
module
No
OK
Yes
Check 6V to
module
measure to V-
No
OK
Yes
Check S/D
voltage to
module (5V)
measure to V-
No
OK
Yes
Check O/P to
module for
80Vpp square
wave
measure to
GND
No
OK
Yes
Check L1,
L2, L3, L4,
C6, C24
PSW-D115
Check
transformer,
CMC,
rectifier, C1,
C2, D9, D10,
R16, R17
Check D6,
R9, R46
Check D1,
R1, Q3, Q4,
Q5 and SCP
1 3