Technics RS-273US - Page 4

NOTE:
1. Make sure heads are clean.
2. Make Sure capstan and pressure roiler are clean.
3. Judgeable room temperature: 20° 4:5°C (68+9°F).
4. Inout selector: LINE IN.
ITEM
MEASUREMENT & ADJUSTMENT
MEASUREMENT & ADJUSTMENT METHODE
5. Output control: MAX.
6. Tape select switch: NORMAL.
7. Dolby NR switch: OUT.
REMARKS
Pressure of Pressure Roller
Equipment:
* Tension Gauge
. Place unit into playback mode.
2. Hook tension gauge to pressure roller shaft top (A), and
pull gauge in direction opposite to pressure of pressure
roller against capstan
. Read pressure indicated on gauge immediately when pres-
sure roller moves away from capstan and stops rotating.
Standard Value: 600+100 gr
Adjustment method
Adjust by bending the (B) part of the pressure roller spring.
* Playback Mode
Takeup Tension
Equipment :
* Cassette Torque Meter
(RP-8063)
Head Azimuth Adjustment
Equipment:
* VTVM
* Oscilloscope
* Test Tape (Azimuth)
.C-AA
* Tape Path Viewer
..RT-8133
1. Mount cassette torque meter on unit.
2. Place unit into playback mode and read takeup torque.
3. Measure several times and determine the mean value.
Standard Value: 55-415 gr-cm
if the measured value is not within standard, clean the rota-
tional parts of the mechanism with alcohol.
Record/playback head adjustment
1. Test equipment connection is shown below
|
(Oscilloscope )
(Test Tape) (Playback Mode) (VTVM)
Fig. 7
. Play azimuth tape (C-AA 6.3 kHz).
. Adjust record/playback head azimuth adjustment screw
(C) in fig. 8 so that output level at LINE OUT jack become
maximum
. Measure both channels, and the leve! difference between
channels shoud be minimised by adjusting.
. After adjustment lock head azimuth adjustment screw
with lacquer.
Erase head adjustment
1. Test equipments connection is the same as above but use
the tape path viewer (RT-81 33) instead of test tape (C-AA).
. Play this tape.
. Adjust screw (D) shown in fig. 9 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.
* Playback Mode
R/P Head
Erase Head