Adjustment - JVC KS-FX621 Service Manual

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3.1 Adjustment method
Test instruments reqired for adjustment
1. Digital oscilloscoe(100MHz)
2.Frequency counter meter
3.Electric voltmeter
4.Wow & flutter meter
5.Test tapes
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(11V to 16V allowance)
Load impedance............ 4
Line out level/Impedance..............1.0V/20k load (250 nWb/m)
TE
L 13942296513
Frequency band
FM
Band
MW
AM
LW
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(Mechanism adjustment)
(4 to 8 allowance)
87.5 MHz to 108.0MHz
522 kHz to 1620 kHz
144 kHz to 279 kHz
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SECTION 3 8

Adjustment

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 999kHz/62dB, INT/400Hz, 30%
FM mono mode 97.9MHz/66dB, INT/400Hz, 22.5kHz
FM stereo mode 1kHz, 67.5kHz dev.pilot 7.5kHz dev
Output level 0dB (1 V,50 /open terminal)
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modulation signal on recieving.
deviation pilot off mono
0 5 8 2 9 9 4
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KS-FX621
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(No.49825)1-17