Adjustment - JVC KW-XC88 Service Manual

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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)
(7) Test disc (JVC : CTS1000)
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
FM mono mode
FM stereo mode
Output level
Measuring conditions (Amplifier section)
Power supply voltage : DC14.4V (11V to 16V)
Load impedance
Line out
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: 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)
: 4Ω (4Ω to 8Ω allowance)
: 2.0V/20kΩ load (250 nWb/m)
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SECTION 4
8

ADJUSTMENT

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(No.MA099B)1-27