PSW-D/DPS-10 POWER MODULE TESTING FLOW CHART
CAUTION : MODULE OUTPUT IS FLOATING AND IS NOT PROTECTED AGAINST A SHORT
TO GROUND. ALL TEST INSTRUMENTS CONNECTED TO THE OUTPUT MUST
BE FLOATING. ATTACH THE SCOPE PROBE TIP TO SPK - and REFERENCE
LEAD TO SPK+.
no
no
yes
yes
no
no
yes
yes
no
no
yes
yes
no
no
yes
yes
START
Check V+; V-;
+/-15V voltage
at the module
Check fuse
transformer,
CMC, rectifier,
C1 and C2
Use scope to
check switchi4.
High-Pass
Check input of
module wrt GND
= 0V D.C.
Power up with no
signal input
LED RED
OK
OK
OK
OK
OK
OK
OK
OK
Check C29 and
Pre-AMP
Use scope to
check O/P at
module wrt GND
90Vpp square
wave shown
Check L1, L2,
L3, L4, C6 and
C24
Check 6V at the
module wrt V-
=6.2V
Replace
Module
MODULE OK
END
Check D1, R1,
Q3, Q4, Q5,
and SCP
Check
transformer,
CMC, rectifier,
C1, C2, D9,
D10, R16 and
R17
Check S/D volt-
age at the module
wrt V- =5.75V
Check D6, R9
and R46
Resistance check
(no load)
between V+ V-,
V+ O/P,V- O/P
and O/P to GND
is > 5K
13
