Harman 930 User Manual

MPX ALIGNMENT
INSTRUMENTS: STEREO GENERATOR, OSCILLOSCOPE, VTVM
SET SELECTOR SWITCH TO "FM"
FM AUTO SWITCH TO AUTO
MODE SWITCH TO STEREO
TUNING DIAL SETTING: STEREO SIGNAL GENERATOR
STEREO PILOT ADJUST (VR301) SET TO MID POSITION.
SET SEPARATION CONTROL (VR302) MAX POSITION COUNTERCLOCKWISE
STEPS
19KHz
SIGNAL GENERATOR
OUTPUT INDICATOR
PILOT LEVEL FREQ. SET TO CONNECTED TO
6% STEREO Generator Use only low
1
19KHz
capacity scope
probe
TP3
ADJUST ADJUST FOR
L301 Maximum
L302 30KHz at
TP3
100Hz
Adjust VR 301 till STEREO beacon lamp just comes ON
2 6%
composite
L-channel
3
Repeat 1
& 2 until no further change
1000Hz Scope probe to
Minimum at
composite TP3 L302
Tape Out &
4 9% L-channel VTVM to R-channel
Maximum at
T.OUT
TP3 simultane-
ously
Read separa-
tion, remove
5 9%
1000Hz
Scope probe to
scope probe,
L-channel
TP3
L303 adjust L303
VTVM to R-channel
CW until same
T.OUT separation.
Do not try for
better amount.
6 9%
1000Hz
R, L. Channel
VR302 Equal L & R
L-composite
TAPE OUT
separation
7 Adjust separation control VR302 IF if necessary
FM STEREO THRESHOLD ADJUSTMENT
INSTRUMENTS: FM STEREO SIGNAL GENERATOR, VTVM, OSCILLOSCOPE.
SET SELECTOR SWITCH TO FM. STEREO AUTO SWITCH TO STEREO.
FM STEREO SIGNAL GENERATOR
OUTPUT INDICATOR
STEPS
CONNECTED TO
ADJUST
ADJUST FOR
CONNECTED TO SIGNAL STRENGTH
1 FM Antenna 70uV Osei 11 oscope VR101 Must be STEREO
Terminal
to
Tape output
2
<1ouv
Check
Must be MONO
MUTING ADJUSTMENT
STEPS CONDITION
ANTENNA OUTPUT INDICATOR
ADJUST
ADJUST FOR
INPUT
CONNECTED TO
1 Muting
10uA Check output
Switch OFF
Osei II oscope
2
Muting 10uV
TAPE OUTPUT
Muting VR
Adjust VR702
Switch ONN
Control Clockwise until
VR702 output is just
distinguished
(1) Set volume control to minimum position.
(2) Connect 8 ohm load resistor to speaker terminals in parallel.
AUDIO DRIVER
BIAS ADJUSTMENT
(3) Connect 30mV DC millivolt meter to left channel test point TP1 (R617)
(4) Adjust bias control VR601 counterclockwise until millivolt meter indicates 15mV. '
(5) Change millivolt meter from left channel to right channel.
(6) Adjust bias control VR21 counterclockwise until millivolt meter indicates 15mV.
5

Harman 930 Specifications

General

Brand	Harman
Model	930
Category	Receiver
Language	English