PB10
28
PB10 Testing Procedure (Cont.) (Revision 2 Only)
PB10 POWER MODULE TESTING FLOW CHART - REVISION 2 ONLY
CAUTION : SPEAKER 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 S - and REFERENCE
LEAD TO S+.
(A 10mV signal may need from the input to trigger the
Switch
turn on)
no
no
yes
yes
no
no
yes
yes
no
no
yes
yes
no
no
yes
yes
START
Check +/-15V-MOD
+/-15V voltage at
U 6(8),U6(4)
Discharge C37,
Check fuse
transformer, L4,
rectifier, C6 and C8
Use scope to check
switching
frequency U6(7)
100KHz
+/-10% , ~22Vp-p
Check Q4(E)
TO V-
= 0V D.C.
Power up with no
signal input
LED RED
OK
OK
OK
OK
OK
OK
OK
OK
Check
MUTE(+8V) and
Q24,Q25,Q26
Use scope to
check O/P U7(6)
and GND
90Vp-p square
wave shown
Check
L2,L3,C71,C72,
C73,C74
I/P:10mv/50HZ
Check +15V/SW
Q4(E) TO V-
15V
Replace
Q18,Q22
CLASS D AMP OK
END
Check
U7,Q16,Q17,
Q20,Q21,R87,
D26,D35,C64
Check
FB1,FB2,C45,
C50,C60,C63,
R81,R82
Check
U7(1) = -33V
Check
MUTE
(-10.7V),
And
Q24,Q25,Q26
Resistance check
(no load)
between V+ V-,
V+ O/P,V- O/P
and O/P to GND
is > 10K
Summary of Contents for PowerBass PB10
Page 41: ...41 PB10 PCB version 6 3 7 0 Revision 1 Only ...
Page 42: ...42 PB10 PCB version 6 3 7 0 Revision 1 Only ...
Page 43: ...43 PB10 PCB version 6 3 7 0 Cont Revision 1 Only ...
Page 44: ...PB10 PCB version 6 4 Power Amp Only Revision 1 Only ...
Page 45: ...PB10 PCB version 7 2 Revision 1 Only ...
Page 46: ...PB10 PCB version 7 2 Revision 1 Only ...
Page 47: ...PB10 PCB version 7 2 Revision 1 Only ...
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Page 53: ...53 PB10 Revision 2 Schematic Diagrams PREAMP ...
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