Harman Kardon 150+ - Am Alignment Procedure

ALIGNMENT PROCEDURES
AM IF AMPLIFIER ALIGNMENT PROCEDURE
INSTRUMENT: AM Generator (With Scope)
OUTPUT OF GENERATOR: Connect to TC5 (On V.C. - AM OSC) Terminal 455KC
Adjust I FT51 for Maximum
NOTE: Keep Signal as low as possible when adjusting.
AM ALIGNMENT PROCEDURE
INSTRUMENT: AM Signal Generator, AC VTVM & Oscilloscope
NOTE: Set Function Switch to "AM"
Set Mode Switch to "MONO"
Set Volume Control to "MINIMUM"
Input Signal must be kept as low as possible to avoid A.G.C action
Steps
Signal Generator
Tuning Dial
VTVM & Scope
Coupling
Frequency
Setting Connection
1 515KHz
Frequency
Minimum
2 1650KHz
Frequency
Maximum
*3
600KHz
600KHz
4
The Test Loop
(400Hz, 30%
about 60 cm (2 ft.)
away from AM Bar
Modulation)
L Channel Tape
( Loop Stick) An-
Out Terminal
1400KHz
1400KHz
5
tenna
(400Hz, 30%
Modulation)
*6
7
1000KHz 1000KHz
(400Hz, 30%
Modulation)
8
Generator
Output 0.1 V
Adjustment
L53 (AM OSC
Coil)
TC6 (AM OSC
TRIMMER)
L51 (BAR ANT
TRIMMER)
L52 (AM RF
Coil)
TC5 (BAR ANT
TRIMMER)
TC7 (AM RF
TRIMMER)
VR52
VR53
*3
Repeat Steps 1 and 2 until no further improvement is notice
*6
Repeat Steps 4 and 5 until no further improvement is notice
-2-
Adjust for
Maximum
Amplitude
0.225V (RMS)
Output
Tuning Meter
Full Scali