JVC KW-XC777 Service Manual page 25

QQ
3 7 63 1515 0
Item
1.Tape position
2.Head azimuth ajust
and check
TE
L 13942296513
3.Tape speed
WOW & Flutter
4.Playback frequency
responce
www
.
http://www.xiaoyu163.com
Adjustment and check method
a) Playback at FWD side, use the mirror tape and
adjuste azimuth screw A and B, check the tape
position at tape guide position of the head.
b) Playback at REV side, use the mirror tape and
adjuste azimuth screw A and B, check the tape
position at tape guide position of the head.
c) Playback at FWD and REV both side, check the
tape position at tape guide position at the head.
a) Playback at FWD side, adjuste azimuth screw A
to make peak position of Lch /Rch.
* Oscilloscope wave forme standard is 45 digrees.
b) Playback at REV side, adjuste azimuth screw B to
make peak position of Lch/Rch.
* Oscilloscope wave forme standard si 45 digrees.
c) Chech the level difference of FWD side and REV
side less than 3dB by VTVM.
d) After operation check, Lch/Rch azimuth output
level difference is less than 1 dB at adjustment
level.
Head
OK
Head Tape
a) Check the frequency counter and wow flutter
meter are 2940~3090Hz(FWD/REV), less than
0.35%(RMS).
b) If tape speed is not clear the specification, adjust
the v.resistor inside of motor.
a) Playback the test tape(VT724:1kHz), spreaker
output set to 2V by set volume.
Playback the test tape(VT739), check level differe
x ao u163
y
b) to 0 3dB at 1kHz/10kHz, -4dB
1kHz/63Hz.
i
10kHz level is not clear the specification, readjust
the head azimuth.
http://www.xiaoyu163.com
2 9
8
Q Q
3 6 7 1 3 1 5
Tape guide
Tape position NG
co
2dB at
.
9 4 2 8
Adjust Spec
Azimuth
screw A
Azimuth
screw B
PHASE
0 45
0 5 8 2 9 9 4 2 8
Tape speed
Internal
2940~3090Hz
v.resistor
WOW & Flutter
less than 0.35%
(RMS)
Speaker output
m
1kHZ/10kHz
:0 3dB
1kHZ/63Hz
:-4 2dB
KW-XC777
9 9
9 9
1-25