Harman Kardon 730 Technical Manual page 4

AM ALIGNMENT PROCEDURE
INSTRUMENTS:
AM Signal Generator modulated with 400Hz at 30%.
VTVM.
AM Sweep Generator and Oscilloscope.
NOTE: Set Function Selector Switch to AM
Connect signal source to a test loop placed to radiate signals into AM Antenna Loop Stick ( L252).
CONNECT OUTPUT DIAL
Step SIGNAL SOURCE FREQUENCY
METER TO
SETTING ADJUST
ADJUST FOR
1 AM Sweep Generator 455kHz VTVM and Oscilloscope Quiet Point T252 Maximum and Top
to R272 (4.7 k ohm)
Near (Ceramic Flat Pattern
1600kHz Filter) on Oscilloscope
2 T253 Maximum Output
3 T254 Maximum Output
4 Repeat Steps 1 through 3 for best sensitivity.
5 AM Signal Generator 600kHz VTVM and Oscilloscope 600kHz L251 Maximum Output
to R272 (4.7 k ohm)
6 1600kHz 1600kHz TC1 Maximum Output
(on Front
End)
7 Repeat Steps 5 and 6 for best dial accuracy.
8
AM Signal Generator 600kHz VTVM and Oscilloscope
600kHz L252
to R272 (4.7 k ohm) T251 Maximum Output
9 1600kHz 1600kHz TC2 Maximum Output
TC3
10 Repeat Steps 8 and 9 for best sensitivity.
POWER AMPLIFIER IDLING ADJUSTMENT
INSTRUMENTS:
DC VTVM
NOTE: Set Function Selector Switch to AUX
Set Volume Control to minimum and set Tone/Balance controls to mid position.
Set Stereo/Mono Switch to Stereo.
Speaker Switch to ON.
Connect 8 ohm (50W) resistor across left and right speaker terminals.
Step
CONNECT OUTPUT TO ADJUST ADJUST FOR
1 DC VTVM between 0418 (collector) VR402
35mV ±5mV
and 0420 (Collector)
2 DC VTVM between 0417 (collector) VR401
35mV±5mV
and 0419 (Collector)
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