Technics RS-630USD User Manual

ADJUSTMENTS
Before measuring and adjusting “Overall frequency response’, “Overall distortion” and “Overall S/N ratio’, confirm that the characteris-
tics of 5 items below are within standard which have much relation to or influence on electrical performances above.
1.
5.
Head azimuth adjustment. 2. Bias current. 3. Playback gain. 4. Overall gain.
Playback frequency response.
TEST INSTRUMENTS
1
2.
Prepare test instruments which are equivalent in accuracy to those shown below.
The test instruments should be inspected and corrected by specialists once every 6 months, because a long period of use
without maintenance may increase errors in indication.
_ Warm-up the test instruments for 30 minutes and the set to be measured for 10 minutes before taking the measurements.
If not, there may arise an error or difference between the initial value and the stabilized value measured after “aging”.
. Specifications of test instruments.
(1) Audio frequency oscillator
(2)
a. Oscillation frequency : 5Hz~500 kHz (5 ranges)
b. Frequency tolerance: +(3% +1Hz)
c. Sine wave
* Output voltage: 5Vrms + 10% (without load)
* Output frequency response: Within £0.2dB, 20Hz~ 20kHz
(at 25°C) 2.5Vrms +10% (with 6002 load)
Within +0.5dB, 5Hz~500 kHz
* Distortion factor: Not more than 0.05%, 200 Hz ~ 20 kHz
Not more than 0.5%, 5Hz~ 500 kHz
* Output impedance: 6002 unbalanced, within +15%
* Output attenuator : 0, 20dB, Error: within +0.2dB
d. Temperature in use of set: | Temperature=0~ 40°C, Humidity = 90% or less
Automatic-stop distortion meter (with vacuum tube voltmeter)
A. Distortion factor measurement
a. Frequency : 400Hz, 1kHz 10%
(fundamental wave)
b. Measurement: 0.1~ 100% (6 ranges)
c. Input: 50mV~50V
d. Fundamental wave attenuation: 60 dB or more
B. Level measurement
a. Measurement: 1mV (—60dB) ~ 30 V (30dB) (9 ranges)
b. Frequency response: 20Hz~100kHz +0.3dB
(1 kHz basis)
c. Input impedance: 1MQ +£10%, less than 50 pF
d. Error in indicated value: Within +3% at 1kHz
C. Output terminal
a. Frequency response: 10Hz~100kHz +1dB
b
100kHz~1MHz +3dB
. Output voltage: 1Vrms +10% (1kHz sine wave)

Technics RS-630USD Specifications

General

Brand	Technics
Model	RS-630USD
Category	Tape Deck
Language	English