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Harman Kardon 75+ - Page 4

Harman Kardon 75+
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MPX
ALIGNMENT
PROCEDURE
Step
1
-
2
-
3
-
4
5
6
7
8
9
10
11
INSTRUMENTS: S.S.G.,
Stereo
Generator,
V.T.V.M., Oscilloscope, Oscilloscope
of
low
input
capacitance,
and
Distortion Meter
L + R = 90%,
Pl
LOT=
9%,
modulation
NOTE:
Set
TONE
control
to
flat response (or mechanical
center
of
both
of
BASS
control
and
TREBLE
control).
Set
FUNCTION
selector
to
FM
STEREO.
SIGNAL
SOURCE
OUTPUT
METER
ADJUST
ADJUST
FOR
L102
For
maximum
on
scope
connected
to
T.P.
at
Connect
SSG
modulated
Connect
low
input
L103
minimum
resistance
(or
with
MPX
Generator
to
capacitance oscilloscope
extreme
counter
clock-
FM
ANT
terminals.
to
TEST
POINT
TP.
L104
wise)
of
VR101
and
Output
level:
1mV
Connect
oscilloscope
maximum
resistance
(or
Pilot
level: 6%
to
TAPE
OUT
of
extreme
clockwise
of
both
channels.
VR102.
VR101
Adjust
VR101
until
STEREO
INDICATION
lights.
The
INDICATION
will
go
out
for
the
Pl
LOT
level
of
lower
than
6%.
Same
as
above,
but
PILOT
LEVEL:
9%,
L102
For
maximum
stereo
only
RIGHT
channel
separation.
is
modulated
with
main
signal
of
1
kHz.
Change
main
signal
For
maximum
stereo
modulation
to
LEFT
L102
separation.
channel.
Repeat step 5
and
6, and
if
unbalance
of
stereo separation between
LEFT
and
RIGHT
exists,
correct
it
with
VR102.
Check
PILOT
level
that
STEREO
INDICATION
lights
at
5.5%
to
6.5%
of
PILOT
LEVEL
andthat
the
INDICATION
does
not
light
at
1%
of
P.L.
Return
Pl
LOT
LEVEL
to
9% and
check
stereo separation
at
1
00Hz
and
10kHz.
At
32dB
(40µV)
of
SSG
output,
adjust
STEREO
THRESHOLD,
VR012
for
STEREO
INDICATION
ON.
Remove oscilloscope
from
test
point,
TP and
adjust
again L
104
for
best stereo separation.
POWER AMP.
UNIT
(Alignment of Idle current of output
transistors).
INSTRUMENTS: High sensitivity D.C.
voltmeter
or
synchroscope.
NOTE:
Set
VOLUME
control
to
minimum
output.
No signal.
Step
CONNECT
M.S.
VOLTMETER
TO
ADJUST
ADJUST
FOR
1 Across
emitter
of
0347
and
collector
of
0348.
VR341
5.5mV
on
voltmeter.
2 Across
emitter
of
0447
and
collector
of
0448.
VR441
Same
as
above.
3 Across
emitter
of
0547
and
collector
of
0548.
VR541
Same
as
above.
4
Across
emitter
of
0647
and
collector
of
0648.
VR641
Same
as
above.
-4-

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