Harman Infinity BU-80 Service Manual

BU80/HTS-10 rev. "A,B"
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
C
heck V+; V-;
+/-15V voltage
at the module
C
heck fuse
transformer,
CMC, rectifier,
C1 and C2
U
se scope to
check switching
frequency from
the load 100KHz
+/-10% , ~1Vpp
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
C
heck C12 and
Pre-AMP
U
se scope to
check O/P at
module wrt GND
80Vpp square
w
ave shown
C
heck L1, L2,
C6 and C24
C
heck 6V at the
module wrt V-
=6.2V
R
eplace
Module
MODULE OK
END
C
heck D1, R1,
Q3, Q4, Q5,
and SCP
C
heck
transformer,
CMC, rectifier,
C1, C2, D9,
D10, R16 and
R17
C
heck S/D volt-
age at the module
wrt V- =5.7V
C
heck D6, R9
and R46
R
esistance check
(no load)
between V+ V-,
V+ O/P,V- O/P
and O/P to GND
is > 5K
13

Harman Infinity BU-80 Specifications

General

Brand	Harman
Model	Infinity BU-80
Category	Subwoofer
Language	English