Adjustment - JVC KS-FX490 Service Manual

3.1 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
3.3 Measuring conditions (Amplifier section)
• Power supply voltage.............. DC14.4V (11V to 16V allowance)
• Load impedance............ 4Ω (4Ω to 8Ω allowance)
• Line out level/Impedance..............1.0V/20kΩ load (250 nWb/m)
3.4 Frequency band
FM 87.5 MHz to 107.9 MHz
Band
AM 530 kHz to 1710 kHz
SECTION 3

Adjustment

3.2 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 con-
ditions, Playback the test tape VT721.
AM mode
FM mono mode
FM stereo mode
Output level
999kHz/62dB, INT/400Hz, 30%
modulation signal on receiving.
97.9MHz/66dB, INT/400Hz, 22.5kHz
deviation pilot off mono
1kHz, 67.5kHz dev. pilot 7.5kHz dev.
0dB (1µV,50Ω/open terminal)
(No.49845)1-19