Harman kardon 900 service manual
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Extracted text from harman kardon 900 service manual (Ocr-read)
Page 1
The Harman-Kardon
Model 900+
AMIStereo FM
Multichannel Receiver
Technical Manual
harman / kardon
Page 2
ALIGNMENT PROCEDURES
AM IF AMPLIFIER ALIGNMENT PROCEDURE
INSTRUMENT: AM Generator (With Scope)
OUTPUT OF GENERATOR: Connect to TCS (On V.C. - AM OSC) Terminal, Frequency = 455 KHz.
Adjust |FT51 for Maximum
NOTE: Keep Signal from Generator as low as possible when adjusting.
INSTRUMENT: AM Signal Generator, AC VTVM 8i Oscilloscope
AM ALIGNMENT PROCEDURE
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.V.C. action
Si nal Generator ' '
Steps 9 Tuning'Dial VTVM 8 Scope Adjustment Adjust for
Coupling Frequgncy Setting Connection
Frequency L53 IAM 080
1 515KHZ Minimum COII)
Frequency TCG (AM OSC
2 165°KHZ Maximum TRIMMER)
*3
L51 (BAR ANT
The Test Loop SOOKHZ 600 TRIMMER)
4 (400Hz, 30%
about 60 cm (2 ft.) . L52 (AM RF _
Modulation) L Channel Tape C - MaXimum
away from AM Bar . 0' .
(L S _ k) A Out Terminal Amplitude
°°p C "' 1400KH2 1400KHz T05 (BAR ANT
5 tenna (400Hz 309/ TRIMMER)
'. ° TC7 (AM RF
Modulation) TRIMMER)
. IOOKHz (400Hz,
6 30% Mod.) 1000KHz lFT51
IOOOKHZ 1000KHZ 0.225V (RMS)
VR
7 (400Hz, 30% 52 Output
Modulation)
8 gangrlattor VR53 lunling Meter
1000 Microvolts I Scale
'3 Repeat Steps 1 and 2 until no further improvement is noticed.
*6 Repeat Steps 4, 5 and 6 until no further improvement is noticed.