Technics RS-BX828

pt
“on
rad
| RS-BX828
Mi
MEASUREMENT
AND
ADJUSTMENT
METHODS
Measurement Condition
¢ Rec. level control; Maximum
* Timer switch; Off
* MPX filter switch; off
¢ Calibration-bias control; Center
Rec. balance control; Center
Measuring instrument
© EVM (Electronic Voltmeter)
* Oscilloscope
¢ Digital frequency counter
¢ AF oscillator
Test tape
Head
azimuth
adjustment
(8kHz,
—20dB);
QZZCFM
*
Playback
gain
adjustment
(315Hz,
0dB);
QZZCFM
*
Playback
frequency
response
(315Hz,
12.5kHz
10kHz, 8kHz, 4kHz, 1kHz, 250Hz, 125Hz, 63Hz,
—20dB); QZZCFM
e Adjustment Points
MAIN PC.B..
OVERALL FREQUENCY
RESPONSE ADJ.
VR30I1(Leh)VR302 (Reh)
* Calibration-level controi; Center
© Dolby NR switch; Off
¢ Make sure heads are clean
¢ Make sure capstan and pressure roller are clean
¢ Judgeable room temperature 20+5°C (68+9° F)
¢ ATT (Attenuator)
¢ Resistor (600Q)
¢ Overall frequency response, Overall gain adjustment,
AC Bias trap adjustment, Erase current adjustment,
HX Pro adjustment, Rec cal. adjustment
Normat reference biack tape; QZZCRA
CrO, reference blank tape; QZZCRX
Metal reference blank tape; QZZCRZ
Play Rec
(out) (in)
HX PRO AOJ.
L3O0M Leh), L 302(Rch)
PLAYBACK GAIN AOU.
VR3(Lch), VR4 (Reh)
REC CALIBRATION ADJ.
VR9 (Bias )
VRIO( Level)
MODE
TEST
POINT
K
V
R302
L302
VRZ
AID
BIG
(Soldered
Surface)
eS
J
VR4
VRIO
VR9
vr301@)
vo
a
VRS
VR303
_
ali
2
OVERALL
GAIN
ADu.
ie
VRS5(tch),
VRG6(Rch)
TP6
2
St!
ii
>|
ERASE CURRENT ADJ.
VR303
AC BIAS TRAP ADJ.
Li({teh) L2¢Reh)
>|