1-20 (No.49855)
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
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)
• Power supply voltage.............. DC14.4V (11V to 16V allowance)
• Load impedance............ 4
Ω
(4
Ω
to 8
Ω
allowance)
• Line out level/Impedance..............1.0V/20k load (250 nWb/m)
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)