Technics RS-B555

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Mi MEASUREMENT AND ADJUSTMENT METHODES
Measurement Condition
¢ Rec. level control; Maximum
© Timer switch; Off
¢ MPX filter switch: off
¢ Bias-adjustment VR: Center
Measuring instrument
© EVM (Electronic Voltmeter)
* Oscilloscope
* Digital frequency counter
¢ AF oscillator
Test tape
* Head azimuth adjustment (8kHz, —20dB); QZZCFM
* Tape speed adjustment (3kHz, —10dB); QZZCWAT
¢ Playback frequency response (315Hz, 12.5kHz, 10kHz,
8kHz, 4kHz, 1kHz, 250Hz, 125Hz, 63Hz, —20dB);
QZZCFM
e Adjustment Points
OVERALL FREQUENCY RESPONSE ADu.
VR301I (Leh), VR302 (Reh)
MAIN PC.B.
AC BIAS TRAP ADJ.
LI (tch),La(Rch)
© Dolby NR switch; Off
° Make sure heads are clean
e Make sure capstan and pressure roller are clean
¢ Judgeable room temperature 20+5°C (68+9’ F)
¢ ATT (Attenuator)
¢ DC voltmeter
¢ Resistor (600Q)
e Playback gain adjustment (315Hz, 0dB); QZZCFM
¢ Overall frequency response, Overall gain adjustment
Normal reference blank tape ; QZZCRA
CrO, reference blank tape; QZZCRX
Metal reference blank tape; QZZCRZ
Line Line
Out in
Cy}
PLAYBACK GAIN ADu.
VR I (Leh), VR2 (Reh)
= OVERALL GAIN ADJ.
VR3 (Lich), VR4 (Roh)