Technics RS-M5 - Page 6

Caution:
Tape speed can be adjusted through the small hole on the back-side
of main case by the © driver as shown in the diagram below.
Tape speed adjustment VR.
Cdriver
MEASUREMENT
AND
ADJUSTMENT
METHODS
NOTES: Keep good condition, set lever switches and controls in the following positions, unless otherwise specified.
@ Make sure heads are clean. @ Tape selector: Normal position
@ Make sure capstan and pressure roller are clean. @ |nput selector: Line in
@ Judgeable room temperature: 20+5°C (68£9°F) @ Input level control: Maximum
© Dolby NR switch: OUT
MEASUREMENT & ADJUSTMENT
Record/playback head azimuth adjustment
1. Test equipment connection is shown in fig. 9.
2. Playback azimuth tape (QZZCFM 8 kHz).
3. Adjust record/playback head angle adjustment screw (A) in
fig. 10 so that output level at LINE OUT becomes maximum.
® Head azimuth
adjustment
Condition:
* Playback mode
Test tape Playback mode VTVM Oscilloscope
oe * Oscilloscope 4. Measure both channels, and adjust levels for equal output. Fig. 9
5. After adjustment lock head adjustment screw (A) with lacquer.
*
Test
ie
(azimuth)
Record/playback
head
head
“G ZZCFM Erase head azimuth adjustment iol
*
Test
tape
(tape
sate
1.
Test
equipment
connection
is
the
same
above
but
use
the
tape
path viewer (QZZCRD) instead of test tape (QZZCFM). a 8)
2. Playback this tape. ; .
3. Adjust screw (B) shown in fig. 11 so that the tape may not get Fig. 10 Fig. 11
curled or malformed by tape guide of the erase head.
_ After adjustment, lock head adjust screw (B) with lacquer.
Tape speed accuracy
1. Test equipment connection is shown in fig. 12.
2. Playback test tape (QZZCWAT 3,000Hz), and supply playback
® Tape speed
Condition:
* Playback mode
Equipment:
3
ae
si
aes
electronic
counter.
Test
=
Playback
mode
Digital
electronic
counter
*
Digital
electronic
counter
or
'
pire
seaguard
wieiees
Fig.
12
sce
ean
4.
On
the
basis
of
3,000
Hz,
determine
value
by
following
formula:
frequency
counter
+3000
* Test tape --- Q7ZCWAT
Tape speed accuracy = x 100 (%)
3,000
where, f = measured value
5. Take measurement at middle section of tape.
| Standard value: +1.5% |