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Fig. 6
RS-M7
Fig
.7
Procedure
To remove ——
.
Remove
Shown in fig. ——
.
Case cover
+ 2 black screws
2
Bottom cover
+ 3 screws
3
+ Control knob
Front panel
+ Cassette lid
+ 4 screws
Control button assembly
2
2
3,4
|
- 4 red screws
and cassette holder
Mechanism
Circuit board
- 6 red screws
+ Headphone holding screw
+ 3 switch shelters
- 10 screws
MEASUREMENT
AND
ADJUSTMENT
METHODS
NOTE:
1. Make sure heads are clean.
2. Make sure capstan and pressure roller are clean.
4. Dolby NR switch: OUT.
3. Judgeable room temperature: 20+5°C (68+9°F).
Head azimuth adjustment
Condition:
* Playback mode
Equipment:
* VTVM
* Oscilloscope
* Test tape (azimuth)
--- QZZCFM
. Test equipment connection is shown in fig. 8.
. Playback azimuth tape (QZZCFM 8kHz).
. Adjust record/playback head angle adjustment screw (B) in fig.
Test tape
9 so that output level at LINE OUT becomes maximum.
. Measure both channels, and adjust levels for equal output.
. After adjustment lock head adjustment screw with lacquer.
Tape speed
Condition:
* Playback mode
Equipment:
* Digital electronic counter or
frequency counter
* Test tape --- QZZCWAT
5. Tape selector: Normal position.
LINE OUT
©)
Playback mode
VTVM
Oscilloscope
Fig. 8
Record/playback
Fig. 9
Tape speed accuracy
1.
2:
Test equipment connection is shown in fig. 10.
ald
Playback test tape (QZZCWAT 3,000H2z), and supply playback
signal to frequency counter.
Test tape
3. Measure this frequency.
4.
On the basis of 3,000Hz, determine value by following formula:
f—3,000
.
3000 7 X 100 (%)
where, f=measured value
Tape speed accuracy =
P head
Playback mode
Digital electric counter
Fig. 10
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