Technics RS-M04 Service Manual

NOTES
3:
Keep
good
condition,
set
lever
switches
and
controls
in
the
following
positions,
unless
otherwise
specified.
@ Make sure heads are clean. © Tape selector: Auto position
e Make sure capstan and pressure roller are clean. @ Input level controls: Maximum
© Judgeable room temperature: 20£5°C (68£9°F) © Output level control: Maximum
@ Dolby NR switch: OUT
ITEM MEASUREMENT & ADJUSTMENT
®
Head
position
(The
head
adjusting
plate
is
provided
to
adjust
the
tape
touch
of
screw
(A)
‘ad Adjusting Plate
adjustment the head in cue or review mode). Oe me
Condition: 1. Press the playback button and pause button.
* Playback and pause mode 2. Measure the space between the pinch roller and the capstan.
Na ~ Pressure Roller
| Standard value: 0.5+0.3mm
Space (adjustable)
. If the measured value is not within the standard value, untighten
screw (A), and slide the head adjusting plate in the direction Fig. 31
of arrow (B) for adjustment.
© Head azimuth . Test equipment connection is shown in fig. 32. i a FN
adjustment . Playback azimuth tape (QZZCFM 8kHz). (0) S
Condition: . Adjust record/playback head angle adjustment screw (B) tape Playback mode VTVM Oscilloscope
* Playback mode in fig. 33 so that output level at LINE OUT becomes Fig. 32
* Normal m maximum.
E ‘ ; aa age . Measure both channels, and adjust levels for equal output. al daa
paedin _ After adjustment lock head adjustment screw with lacquer.
*VTVM * Oscilloscope
* Test tape (azimuth) 8)
+++
QZZCFM
Fig.
33
@ Tape speed Tape speed accuracy
Condition: 1. Test equipment connection is shown in fig. 34. Record/playback head LINE OUT
* Playback mode 2. Playback test tape (QZZCWAT 3,000Hz), and supply
* Normal tape mode playback signal to frequency counter.
Equipment:
.
Measure
this
frequency.
Test
tape
+
Digital
electronic
counter
or
.
On
the
basis
of
3,000Hz,
determine
value
by
following
Fig.
34
frequency counter formula:
* Test tape ++ QZZCWAT Tape speed accuracy =
aD
o°
Playback mode Digital electric counter
f—3,000
3,000
. Take measurement at middle section of tape.
100 (%) where, f=measured value
Standard value: +1.5%
Adjustment method
1. Playback the test tape (middle).
2. Adjust so that frequency becomes 3,000 Hz.
3. Tape speed adjustment VR shown in fig. 25.
Tape speed fluctuation
Make measurements in same manner as above (beginning, middle and end of tape), and determine the
difference between maximum and le values and calculate as follows:
Tape speed fluctuation =— -~~— X 100 (%) — f1=maximum value, f2=minimum value
fe
aur 000
Standard value: 1%

Technics RS-M04 Specifications

General

Brand	Technics
Model	RS-M04
Category	Cassette Player
Language	English