Yamaha MT 400, Руководство по обслуживанию

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MT400
16
5. Test equipment required
Low Frequency Oscillator
AC voltmeter (level meter)
DC voltmeter
Oscilloscope
Frequency Counter
Mirror Cassette SONY:
MC112C (TX911100)
Torque meter SONY: TW-2231 (TX913450), etc.
6. Mechanical adjustment
6-1 Tape running
Check that a tape curl is not created when playing the mirror tape.
When a tape curl occurs, adjust the height of the head after attaching a Y washer.
6-2 Torque check
Check that the torque of each measurement is within the standard listed below by using a torque meter.
Measurement Mode Standard
FF torque FF
55 120 gcm
REW torque REW
55 120 gcm
PLAY torque PLAY
30 60 gcm
BT torque PLAY
1 6 gcm
Adjustments Test
Tape
Test
Equipment
Mode Condition Test
Point
Adjusting
Point
Standard
1 dBx
voltage -- DC
Voltmeter -- -- TP101
TP201
TP301
TP401 VR103
VR203
VR303
VR403 18.4 +/- 0.2 mV
+ -
2 Tape speed TCW-211
TCC-111
Frequency
counter PLAY 9.5 cm check should
have the priority
MONIT-
OR OUT VR501(9.5 cm)
VR502(4.8 cm) 3000 +10 / -0 Hz
3 Azimuth
and phase TCC-151 AC
Voltmeter
Oscilloscope
PLAY INPUT-FILP: TAPE
FADER-3,4: MAX
PAN-3: L, PAN-4: R
MONIT-
OR OUT Azimuth
adjusting
screw Output: maximum
Phase: in-phase
4 Playback
level TCC-121
TCC-151
AC
Voltmeter
Oscilloscope PLAY TAPE SPEED: 9.5 cm TP601-1P
TP601-2P
TP601-3P
TP601-4P
TP601-1P
TP601-2P
TP601-3P
TP601-4P
VR101
VR201
VR301
VR401
VR102
VR202
VR302
VR402 285 +/- 10 mV
135 mV (-15 +/- 3 dBm)
5 Bias
frequency -- Frequency
counter REC /
PAUSE
TP501 L501 80 +/- 1 k Hz
6 Bias
oscillation
waveform -- Oscilloscope REC /
PAUSE
TP102
TP202
TP302
TP402 L104
L204
L304
L404 Position the waveform recess at
the center.
+ -
7 Recording
Bias Alignment
tape AC
Voltmeter
Oscilloscope REC TAPE SPEED: 9.5 cm
Input frequency: 1 k Hz
14 k Hz
Output level: -30 dBm
CH1
CH2
CH3
CH4 VR105
VR205
VR305
VR405 Adjust the output level of 14
kHz to the same level as the
output level of 1 k Hz.
8 Recording
level Alignment
tape AC
Voltmeter
Oscilloscope REC
PLAY
TAPE SPEED: 9.5 cm
Input frequency: 1 k Hz
Output level: 285 mV
Record and play in the
condition above. CH1
CH2
CH3
CH4 VR104
VR204
VR304
VR404 285 +/- 10 mV
7. Electrical adjustments
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