JVC KW-XC777 Service Manual page 23

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Adjustment method
Test Instruments reqired for adjustment
1.Digital osclloscope(100MHz)
2.Frequency Counter meter
3.Electric voltmeter
4.Wow & flutter meter
5.Test Tapes
VT724
VT739
For playback frequency measurement
VT712
For wow flutter & tape speed measurement
VT703
6.Torque gauge
Measuring conditions(Amplifier section)
Power supply voltage
Load impedance
Line out
TE
Standard volume position
L 13942296513
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 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. pilot7.5kHz dev.
Output level 0dB(1 V,50 /open terminal).
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for DOLBY level measurement
For head azimuth measurement
Cassette type for CTG-N
(mechanism adjustment)
DC14.4V(10.5~16V)
4 (2Speakers connection)
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8
Tuner area
Band range
FM : 87.5MHz to 108MHz
AM : 531kHz to 1602kHz
DUMMY LOAD
Exclusive dummy load should be used for AM
and FM dummy load,there is a loss of 6dB
between SSG output and antenna input. The
loss of 6dB need not be considered since
direct reading of figures are applied in this
working standard.
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3 6 7 1 3 1 5
Arrangement of Adjusting
Cassette Mechanism Section
Capstan motor
Cassette mechanism
(Surface)
Playback head
co
.
Azimuth screw
(Forward side)
9 4 2 8
0 5 8 2 9 9 4 2 8
Tape speed adjust
m
Azimuth screw
(Reverse side)
KW-XC777
9 9
9 9
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