Operation - Technics RS-TR474 Service Manual

-RS-TR474 |
Mi MEASUREMENTS AND ADJUSTMENTS
Measurement Condition See
¢ Recording-level control; Maximum . v8 ¢ Make sure heads are clean
e Recording-balance control; Center pir gt t y . oe ¢ Make sure capstan and pressure roller are clean
e Reverse-mode selector switch; = ; ¢ Judgeable room temperature 20+5°C (68+9°F)
* Tape-to-tape recording-speed switch; Off
* Dolby NR switch; Off
¢ ATC switch; Off
Measuring instrument
EVM /E, *> Voltmeter) "ATT (Attenuator)
* Oscillosce;: : ¢ DC voltmeter
° Digital freque:. "survier ¢ Resistor (600Q)
© AF oscillator
NOTE: Before adjustment, be sure to set the AF oscillator output level to OdB (1kHz): 1V
Test tape
¢ Head azimuth adjustment (8kHz, —20dB) : * Tape speed adjustment (3kHz, —10dB); QZZCWAT
¢ Playback frequency response (315 Hz, ¢ Overall gain adjustment and Overall frequency response
12.5kHz, 10kHz, 8kHz, 4kHz, 1kHz, - +; QZZCFM - - Normal reference blank tape; QZZCRA
250Hz, 125Hz, 63Hz, —20dB) CrO, reference blank tape; QZZCRX1
¢ Playback gain adjustment (315Hz, 0dB) : Metal reference blank tape; QZZCRZ5
e¢ Adjustment Points
Tope speed Tope speed
(DECK2: High) (DECK 2)
Tope speed
(DECK 1)
OPERATION PC.B.
Short Clip
¢ The test mode terminals on mechanism control P.C.B.
should be shorted with a short clip as shown above
figure.
e After the adjustment items disconnect the short clip.