Adjustment - JVC KS-FX385 Service Manual

4.1 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
• 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 (Mechanism adjustment)
Measuring conditions (Amplifier section)
Power supply voltage:
Load impedance:
Line out:
SECTION 4

ADJUSTMENT

DC14.4V (11V to 15V allowance))
4Ω (4Ω to 8Ω allowance)
2.0V/20kΩ load (250 nWb/m)
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%
modulation signal on receiving.
FM mono mode 97.9MHz/66dB, INT/400Hz, 22.5kHz
deviation pilot off mono
FM stereo mode 1kHz, 67.5kHz dev. pilot 7.5kHz dev.
Output level 0dB (1µV,50Ω/open terminal)
(No.MA093B)1-13