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
Check V+; V-;
+/-15V voltage
at the module
Check fuse
transformer,
CMC, rectifier,
C1 and C2
Use 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
Check C12 and
Pre-AMP
Use scope to
check O/P at
module wrt GND
80Vpp square
wave shown
Check L1, L2,
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- =5.7V
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
Содержание Infinity BU-80
Страница 30: ...30 HTS 10 REV C Power Amp Module PCB...
Страница 31: ...31 HTS 10 REV C CIRCUIT BOARD cont...
Страница 32: ...32 HTS 10 REV C CIRCUIT BOARD cont...
