43
PRACTICAL SERVICE FIGURE
< DECK SECTION >
1. Tape Speed Adjustment
Settings:
•
Test tape: TTA-100
•
Test point: TP1
•
Adjustment location: SFR1
Method:
Playback the test tape by DECK2 and adjust
SFR1 so that the frequency counter reads
3000Hz±5Hz. Check that the counter reading
in the REV mode is within the range of ±45Hz
of that in the FWD mode.
2. Azimuth Adjustment
Settings:
•
Test tape: TTA-300
•
Test point: TP1
•
Adjustment location: Head azimuth
adjustment screw
Method:
Playback the 10kHz signal of the test tape and
adjust the adjustment screw so that the output
becomes the -5dB point below the maximum
reading. The adjustment must ends with the
clockwise rotation of the adjustment screw.
Perform this adjustment in both FWD and
REV directions. Fix the adjustment screw with
adhesive agent upon completion of adjustment.
3. PB Sensitivity Adjustment
Settings:
•
Test tape: TTA-200
•
Test point: TP1
•
Adjustment location:
SFR303 (Lch)
SFR304 (Rch)
Method:
Play back the test tape and adjust SFRs so that
the output level of the TP1 becomes
245mV±5mV.
4. REC/PB Frequency Response Adjustment
Settings:
•
Test tape: TTA-602
•
Test point: TP1
•
Input signal: 315Hz/10kHz (LINE IN)
•
Adjustment location: SFR351 (Lch)
SFR352 (Rch)
Method:
Establish the record mode. Input the 315Hz
and the 10kHz signals from LINE IN with the
input level so that TP1 has the signal level of
12mV. Record the 1kHz and the 10kHz
signals, then play them back. Adjust SFR so
that the output difference between the 315Hz
and the 10kHz signals becomes 0dB±0.5dB.
5. REC/PB Sensitivity Adjustment
Settings:
•
Test tape: TTA-602
•
Test point: TP1
•
Input signal: 1kHz /10kHz (LINE IN)
•
Adjustment location: SFR305 (Lch)
SFR306 (Rch)
Method:
Establish the record mode. Input the 1kHz
signal from LINE IN with the input level so
that TP1 has the signal level of 12mV. Record
the 1kHz signal, then play it back. Adjust
SFR so that the output level becomes
12mV±0.5dB.
6. Bias OSC Frequency Adjustment
Settings:
•
Test tape: TTA-601
•
Test point: TP2
•
Adjustment location: L351
Method:
Set to the REC mode. Adjust L351 so that the
frequency at TP2 is 85.0kHz±1kHz.
< DECK SECTION >
Tape speed:
3000Hz±5.0%
Wow & flutter:
Less than 0.21%
Less than 2%
(NORM, CrO
2
)
Less than 50mV
(DOLBY NR OFF, NORM)
Less than 35mV
(DOLBY NR ON, CrO
2
)
NORMAL TTA-100
TTA-300
TTA-601
TTA-602
CrO
2
TTA-200
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