(No.MA132)1-13
SECTION 4
ADJUSTMENT
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)
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.
Measuring conditions (Amplifier section)
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 (1
µ
V,50
Ω
/open terminal)
Power supply voltage
: DC14.4V (11V to 16V)
Load impedance
: 4
Ω
(4
Ω
to 8
Ω
allowance)
Line out
: 1.0V/20k
Ω
load (250 nWb/m)
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