Adjustment Method - JVC KS-FX893 Service Manual

Adjustment method

Test instruments required for adjustment
1. Digital oscilloscope(100MHz)
2. Frequency Counter meter
3. Electric voltmeter
4. Wow & flutter meter
5. Test Tapes
MC-109C ...................
VT724 .......................
For DOLBY level measurement
VT739 ............ For playback frequency measurement
VT712 .... For wow flutter & tape speed measurement
VT703 ..................... For head azimuth measurement
6. Torque gauge .................... Cassette type for CTG-N
Measuring conditions(Amplifier section)
Power supply voltage .............. DC14.4V (10.5 - 16V)
Load impedance ........... 4
Line out ............................................................ 20k
For TAPA CURL confirmation
(without Padd type)
(mechanism adjustment)
(2Speakers connection)
Standard volume position
Balance and Bass,Treble volume .Fader
:Center(Indication"0")
Loudness,Dolby NR,Sound,Cruise:Off
Volume position is about 2V at speaker output with
following conditions. Playback the test tape VT721.
AM mode 1000kHz/62dB,INT/400Hz,30%
modulation signal on receiving.
FM mono mode 97.5MHz/66dB,INT/400Hz,22.5kHz
deviation pilot off mono
FM stereo mode 1kHz,67.5kHz dev. pilot7.5kHz dev.
Output level 0dB(1 V,50
KS-FX893
/open terminal)
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