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MEASUREMENT
AND
ADJUSTMENT
METHOD
NOTE:
1. Make sure heads are clean.
5. Bias selector: LOW.
2. Make sure capstan and pressure roller are clean.
6. Equalizer selector: 120uS.
3. Judgeable room temperature: 20+5°C (68+9°F).
7. Input selector: LINE.
4. Dolby NR switch: OUT.
ITEM
MEASUREMENT & ADJUSTMENT
REMARKS
Pressure of pressure roller | 1. Place UNIT into playback mode.
* Playback mode
Hook the tension gauge to pressure roller lever and pull it in the direc-
tion of the arrow as shown in fig. 10.
3. Measure the tension at the moment when the pressure roller moves
Equipment:
Z
* Tension gauge (max. 500 gr)
Takeup tension
1. Mount cassette torque meter on UNIT.
* Playback mode
Equipment:
2. Place UNIT into playback mode and read takeup torque.
+ Cassette torque meter
3. Measure several times and determine the mean value.
se
KCT
aeons
Standard value: 50+15 gr-cm
Record/playback head adjustment
Head azimuth adjustment
* Playback mode
Equipment:
1. Test equipment connection is shown below.
* VTVM
Record/playback
* Oscilloscope
LINE OUT
head
* Test tape (azimuth)
-+QZZCFM
VTVM
Fig. 11
Test tape
Playback mode
Oscilloscope
_ Play azimuth tape (QZZCFM 8 kHz).
3. Adjust record/playback head angle adjustment -screw (B) in fig. 12 so
that output level at LINE OUT becomes maximum.
4. Measure both channels, and adjust levels for equal output.
. After adjustment lock head adjustment screw with lacquer.
Tape speed
Equipment:
* Digital electronic counter or
frequency counter
* Test tape --- Q7ZCWAT
Tape speed accuracy
* Playback mode
1. Test equipment connection is shown below.
LINE OUT
Playback mode
Digital electric counter
Test tape
Fig. 13
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