JVC KS-FX901 Service Manual page 14

KS-FX901/KS-FX801
QQ
3 7 63 1515 0
Mechanism adjustment section
Item
1. Tape running a) At Forward playmode, using mirror tape, make adjustment
adjustment with Azimuth screw A and Azimuth screw B, without curl of 4
parts of head tape guide.
b) At Reverse play mode, using mirror tape, make adjustment
with Azimuth screw A and Azimuth screw B, without tape
curl of 4 parts of head guide.
c) At Forward / Reverse play mode, make confirmation of no
tape curl of 4 parts of head tape guide.
2. Azimuth a) At forward play mode, make adjustment of peak of Lch / Rch
adjustment output with Azimuth screw A.
confirmation * For Oscilloscope litharge corrugation, set 45 as standard.
b) At Reverse play mode, make adjustment of peak of Lch / Rch
output with Azimuth screw B.
* For Oscilloscope litharge corrugation, set 45 as standard.
c) With AC volt meter confirm the difference of output for 4ch
between Lch / Rch at forward play mode and Lch / Rch
Reverse play mode being within 3.0dB.
d) After operation, make confirmation of Lch / Rch azimuth
output being within 1.0dB from adjustment value.
TE
L 13942296513
HEAD
1.Check to see if the reading of the frequency counter & W ow
2.Tape Speed and
flutter meter is within 2940-3090 Hz( FWD/REV ), and less
Wow & Flutter
than 0.35% ( JIS RMS ).
2.In case of out of specification, adjust the motor with a built-
in volume resistor .
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1.Play the test tape ( VT724 : 1kHz ) back and set the volume
3.Playback
position at 2V .
Frequency
2.Play the test tape ( VT739 )back and confirm 0 3dB at1kHz/
response
10kHz and -4+2dB at 1kHz/63Hz.
3.When 10kHz is out of specification, it will be necessary to
read adjust the azimuth.
1-14
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Adjusting & Confirmation Methods
HEAD
OK
TAPE
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3 6 7 1 3
Tape guide
Tape curl NG
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2 9 9 4 2 8
Adjust Std. Value
Azimuth
screw A
Azimuth
screw B
0
45
Phase
1 5 0 5 8 2 9 9 4
Tape Speed
Built-in
2940-3090Hz
volume resistor
Wow&Flutter
Less than
0.35%
(JIS RMS)
m
Speaker out
1kHz/10kHz
co
: 0dB 3dB,
63Hz/1kHz
: -4dB+2dB,
9 9
2 8 9 9