ADJUSTMENT PROCEDURES
PRECAUTIONS 1. Before adjustment, clean the following parts with an alcohol moistened swab. *recording/playback head *pinch roller *capstan *erase head TEST EQUIPMENT/TOOL REQUIRED Audio Oscillator Digital frequency counter Oscilloscope Attenuator AC voltmeter Non-magnetic screwdriver Test tapes TCC-153 MTT-111N MTT-150 :10kHz, -15dB :3kHz,-10dB :Dolby level calibration 400Hz, tone 200nWb/m
2. Do not use magnetized screwdriver for adjustment. 3. Demagnetize recording/playback head with a head demagnetizer.
Item
Connection of instrument Frequency
Line output level/freq.
Test tape
Mode
Output indicator
Adjustme nt point
Adjustment
Remarks
1
Tape speed
counter to P205 or LINE OUT terminal. AC voltmeter
MTT111N
PB
Frequency counter
R716
3010Hz
Maximum level TCC-153 PB AC voltmeter Fig.1 & same phase at channels L &R R115 Refer to Fig.2.
2
Head azimuth
& oscilloscope to P205
3
Playback level
AC voltmeter to P205
MTT150
PB
AC voltmeter
(L ch.) R116 (R ch.)
300mV
Frequency 4 Bias frequency counter to lead wire of erase head Auto Rec 5 adjustment Normal tape Push a auto-adjust button(S717) Normal tape REC Frequency counter L403 85kHz
REC/PB
Auto(S717)
Blank tapes Normal High Metal UDUDC-90 C-90 PLAY torque �����..30 70g/cm (Use the test tape TW-2231.)
FF/REW torque �����.. 180g/cm (Use the test tape TW-2111.) 80 Back tension �����.. 2 6g/cm (Use the test tape TW-2111.)
