Technics RS-M14 User Manual

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.
@ Make sure capstan and pressure roller are clean.
© Judgeable room temperature: 20-£5°C (68+9°F)
e Dolby NR switch: OUT
ITEM MEASUREMENT & ADJUSTMENT
® Head position
adjustment
Condition:
* Playback and pause mode
® Head azimuth
adjustment
Condition:
* Playback mode
Equipment:
*VTVM — * Oscilloscope
* Test tape (azimuth)
---QZZCFM
* Test tape (tape path viewer)
@ Tape speed
Condition:
* Playback mode
Equipment:
* Digital electronic counter or
frequency counter
* Test tape --- QZZCWAT
“2. Playback this tape.
® Tape selector: Normal position
@ Input selector: Line in
@ Input level controls: Maximum
Screw (A) —
Head Adjusting Plate
Capstan
)
(B)
4
Pressure Roller
(The head adjusting plate is provided to adjust the tape
touch of the head in cue or review mode.)
1. Press the playback button and pause button.
2. Measure the space between the pinch roller and the
capstan.
Standard value: 0.5+0.3mm
Space (adjustable)
3. If the measured value is not within the standard value,
untighten screw (A), and slide the head adjusting plate
in the direction of arrow (B) for adjustment.
Record/playback head azimuth adjustment
1. Test equipment connection is shown in fig. 24.
2. Playback azimuth tape (QZZCFM 8 kHz).
3. Adjust record/playback head angle adjustment screw (B)
LINE OUT
Playback
mode
VTVM
Oscilloscope
in fig. 25 so that output level at LINE OUT becomes “*™* Fig. 24
maximum.
4. Measure both channels, and adjust levels for equal output.
5. After adjustment lock head adjustment screw with lacquer.
Record/playback mode Erase head
Erase head azimuth adjustment
1. Test equipment connection is the same above but use the
tape path viewer (QZZCRD) instead of test tape (QZZCFM).
fh fe
(B)
Fig. 25 Fig. 26
3. Adjust screw (C) shown in fig. 26 so that the tape may not
get curled or malformed by tape guide of the erase head.
. After adjustment, lock head adjust screw with lacquer.
Tape speed accuracy
1. Test equipment connection is shown in fig. 27.
2. Playback test tape (QZZCWAT 3,000Hz), and supply
playback signal to frequency counter.
3. Measure this frequency.
4. On the basis of 3,000Hz, determine value by following
formula:
Test tape Playback mode Digital electronic counter
Fig. 27
f — 3,000
3,000
. Take measurement at middle section of tape.
Tape speed accuracy = x 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. 22.

Technics RS-M14 Specifications

General

Brand	Technics
Model	RS-M14
Category	Cassette Player
Language	English