JVC KS-FX321 Service Manual page 14

KS-FX321
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Mechanism adjustment section
Item
1. Head azimuth
"Head Height Adjustment"
Note
1. Load the mirror tape ( SCC-1659 ). Adjust with height
2. After switching from REV to FWD then to REV, check that
3. Adjust the azimuth screw (b) so that line "B" of the mirror
"Head Azimuth Adjustment"
1. Load the test tape ( VT724: 1kHz ) and play it back in the
2. Load the test tape ( VT703: 10kHz ) and play it back in the
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3. Engage the reverse mode and adjust the output level to
4. When switching between forward and reverse modes, the
5. When the test tape ( VT721 : 315Hz ) is played back, the
2. Tape Speed and 1. Check to see if the reading of the frequency counter & Wow
Wow & Flutter
2. In case of out of specification, adjust the motor with a built-
3. Playback 1. Play the test tape ( VT724 : 1kHz ) back and set the volume
Frequency
2. Play the test tape ( VT739 ) back and confirm 0
response
3. When 8kHz is out of specification, it will be necessary to
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Adjusting & Confirmation Methods
Adjust the azimuth directly. When you adjust the height
using a mirror tape, remove the cassette housing from the
mechanism chassis.
After installing the cassette housing, perform the azimuth
adjustment.
adjustmentscrew (a) and azimuth adjustment screw (b) so
that line "A" of the mirror tape runs in the center between
Lch and Rch in the reverse play mode.
the head position set in procedure "1" is not changed.
*If the position has shifted, adjust again and check.
tape runs in the center between Lch and Rch in the forward
play mode.
reverse play mode. set the Rch output level to maximum.
forward play mode. Adjust the Rch and Lch output levels
tomaximum, with azimuth adjustment screw (b).
In this case, the phase difference should be within 45°.
maximum, with azimuth adjustment screw (c).
*The phase difference should be 45° or more.
difference between channels should be within 3dB.
*Between FWD Lch and Rch, REV Lch and Rch.
level difference between channels should be within 1.5dB.
flutter meter is within 2940-3090 Hz ( FWD/REV ), and less
than 0.35% ( JIS RMS ).
in volume resistor
position at 2V.
8kHz and -4+2dB at 1kHz/125Hz.
read adjust the azimuth.
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3dB at 1kHz/
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Adjust Std. Value
A Line
Head shield
The head is at low position
during FWD.
B Line
Head shield
The head is at height position
during REV.
Head azimuth
Fixed screw
screw
1 5 0 5 8 2 9 9 4
screw (a)
screw (c)
screw (b)
0 °
45 °
Phase
Built-in Tape Speed
volume resistor 2940-3090Hz
Wow&Flutter
Less than
0.35%
(JIS RMS)
Speaker out
1kHz/8kHz
: 0dB_}3dB,
125Hz/1kHz
: -4dB+2dB,
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9 9
2 8 9 9