JVC KD-X2 - Page 7

KD-X2 A/B/C/E/J/G/U
Remarks
Adjusting owl
point owl
Measure the torque in the fast forward More than
mode in the same manner as in the 70 gr-cm
above.
Checking fast
If the standard torque is not obtained,
forward torque
perform the following.
1. Clean the capstan belt, the idler cir-
cumference, the motor pulley, the
take-up reel disc circumference, the
flywheel circumference, etc.
2. Replace the belt and idler.
Checking rewind
torque
Measure the torque in the rewind mode More than
in the same manner as in the above. 70 gr-cm
If the standard torque is not obtained,
clean the capstan belt, idler, motor
pulley, flywheel circumference, rewind-
ing idler circumference, left reel disc
circumference, etc.
[MI] Electrical adjustments location
Main Amp. P.W. Board (parts assembly side view)
(Turning
in
the
direction
of
the
arrow
increases
the
level.)
Ic 85l
MIC JACK
FREQUENCY
L
CH
REC
GAIN
IRie6
Se
L951 | RI65 |
| = |
“i REC GAIN == eS =
| ) |
| |
R266 R265
RCHBIAT VRo52 VRS2 (LcCHeIAS}| L———— J
REC/PB SWITCH
coos | eee
icso! PB EQ
Front
R CH ray i
PB GAIN | a
-_--—-— 1 R18
L
iL CH PB GAIN
Fig. 10
[IV] Electrical circuit adjustment procedure
In
the
steps
marked
by
an
asterisk
(“),
adjustment
should
Adjustment
should
be
performed
in
the
order
of
steps
1,
2,
be
performed,
however,
only
checking
is
sufficient
with
<
eee
Perform
this
adjustment
with
the
NR
SYSTEM
steps
other
than
those.
switch
set
to
OFF.
point value
Checking
1)
Play
back
test
tape
VTT644
(or
VTT-
|
L-ch:
—8dBs
|
When
the
head
is
replaced,
adjust
play back
gain
724), then adjust and check that the
level at LINE OUT is —8 dBs + 2dB.
2) If the standard value cannot be ob-
tained, adjust the playback gain
using R117 & R118 in combination
(for L-ch) and R217 & R218 (for R-
ch), respectively.
playback gain level.
Connect an electronic voltmeter
(with an impedance of 10 k{2 or
more) to LINE OUT terminals.
Note:
Before adjustment, confirm that
each set of resistors (R117 & R118
or R217 & R218) has been con-
nected or disconnected.
NR SYSTEM : OFF
R117
0.8dB down
R118
0.8dB up
R-ch:
R217
R218
Play back
Play back test tape VTT739, then ad- Reference
frequency just VR102 and VR202 so that the frequency:| TAPE SELECT : NORM
response level of 1kHz and 10 kHz signals is 1 kHz,
0O+2dB. 0+2dB
at 10 kHz
(No. 4250) 7
ian ean Sade ec