GX-700/GX-700VCD
GX-700/VCD
OK
Rec out L : ch 1
Rec out R : ch 2
DC input, X-Y (Resurge) mode
NG
Fig. B
0.2V
0.2V
“ELECTRICAL ADJUSTMENT”
●
Use 560 mV (250 nwb/m) for 0 dB as the standard level of the unit.
0dB = 250 nwb/m (315 Hz) = – 7 dBV (Rec out level)
Item to be
Adjusted
Playback
level (315Hz)
Confirmation of
playback frequency
response
Step
1
2
Rating
– 7 dBV
±
0.3 dBV
Check that the 10kHz playback
level is within 0
±
3 dB of the
1kHz playback level. (Fig. C)
Adjustment
parts
VR4 (L ch)
VR1 (R ch)
Tape
MTT-212N
315Hz,
250nwb/m
Test tape for frequency check.
3180
µ
s + 120
µ
s (LH) (MTT-256)
3180
µ
s + 70
µ
s (CrO
2
) (MTT-356)
Points of
measurement
REC OUT
REC OUT
Mode
PLAY
PLAY
Instrument
required
ACVM
ACVM
Oscilloscope
< Playback section >
●
PLAYBACK FREQUENCY RESPONSE
±
4dB
±
3.5dB
1k
±
3dB
±
3dB
3k
10kHz
315
250
50
12.5kHz
Fig. C
Fig. A
24
Azimuth
adjustment
screw. (REVERSE)
Azimuth
adjustment
screw. (FORWARD)
“MECHANICAL ADJUSTMENT”
Item to be
Adjusted
Check each
torque
Check FF, REW
take up time
Azimuth
Tape Speed
Wow/Flutter
Tape
CT-160L (FF, REW)
TW-2111A (FWD)
TW-2121A (RVS)
AC-514 (C-60)
MTT-114N
10kHz, –10dB
MTT-111N
3kHz, –10dB
MTT-111N
3kHz, –10dB
Step
1
2
3
4
5
Mode
FF REW
PLAY
FF REW
PLAY
PLAY
PLAY
Rating
FF, REW torque : within 70 ~ 160g/cm.
Take up torque : 30 ~ 70g/cm.
Back tension : 1.5 ~ 6g/cm.
80 to 120 seconds.
Playback output of L and R is maxi-
mum and phase difference should
be minimum both directions. (Fig. B)
3000Hz
±
15Hz
Less than 0.19% (WRMS)
Remarks
After the adjustment
make sure to apply
screw lock paint.
Perform adjustment at
the center of the test
tape, if possible.
Confirm at center of
the test tape, if possi-
ble.
Instrument
required
Torque
meter
ACVM
Oscilloscope
Frequency
counter
Wow/flutter
meter
Adjustment
part
Azimuth
adjustment
screw. (Fig. A)
VR7