Technics RS-X933 - MEASUREMENT AND ADJUSTMENT OVERVIEW; TEST SETUP AND ADJUSTMENT POINTS

RS-X933
Mi
MEASUREMENT
AND
ADJUSTMENT
METHODES
Measurement Condition
¢ Rec. level control; Maximum e¢ Dolby NR switch; Off
® Timer switch; Off * Make sure heads are clean
e Reverse-mode selector switch; —_—. Make sure capstan and pressure roller are clean
¢ Edit-recording tape-speed selector; X1 e Judgeable room temperature 20+5'C (68+9° F)
Measuring instrument
¢ EVM (Electronic Voltmeter) © ATT (Attenuator)
© Oscilloscope ¢ DC voltmeter
© Digital frequency counter e Resistor (6009)
e AF oscillator
Test tape
© Head azimuth adjustment (8kHz, —20dB); QZZCFM ¢ Playback gain adjustment (315Hz, 0dB); QZZCFM
« Tape speed adjustment (3kHz, —10dB); QZZCWAT ¢ Overall frequency response, Overall gain adjustment
e Playback frequency response (315Hz, 12.5kHz, 10kHz, Normal reference blank tape ; QZZCRA
8kHz, 4kHz, 1kHz, 250Hz, 125Hz, 63Hz, —20dB); CrO, reference blank tape; QZZCRX
QZZCFM Metal reference blank tape; QZZCRZ
e Adjustment Points
MODE TEST POINT OVERALL FREQUENCY RESPONSE
(Soldered Surface) DECK A: VR303(Lch) (VR302 (Rch)) Line Line
MAINP.C.B.
|
So
eae’
out
in.
| (EG) area only]
PLAYBACK GAIN ADu.
DECK B: VR3 (Lch) {VR4(Rch)}
DECK A: VR5 (Lch) {VR6(Rch)}
~K
1C901
vr
[6]
6]
[9]
O}
vrs
VR4
VR5
VR301
6 VR303
VR902 ] vR302 a
appa vrs [@
URS Ope ee TP3 h> OVERALL GAIN ADJ.
VR7 DECK A: VR7 (Lch) {VR8(Rch)}
TP3
TAPE SPEED ADJ.
DECK B: VR902(X1), VR901 (X2) ERASECURRENTADJ. ERASE CURRENT
DECK A: VR903 (X1) DECK A: VR301 ADJ. TEST POINT