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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
Measuring conditions (Amplifier section)
• Power supply voltage.............. DC14.4V (11V to 16V allowance)
• Load impedance............ 4Ω (4Ω to 8Ω allowance)
• Line out level/Impedance..............2.0V/20k load (250 nWb/m)
SECTION 4
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
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.49869)1-13
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