Sharp RT-24H Serviceanleitung Seite 8

DolbV NR Switch-roff
SETTiNG
Record LweLControI; Minimal.
POSITION:
Record -Level Balance Control:
OF SWITCH
'TapeSelector Switch: NorrrgL
ANDKNOB.h
InpufSelector
ITEM
INPUT
OSCILLATION
FREQUENCY
BIAS
CURRENT
E RASE"
CURRENT
Test tape
PLAYBACK
AMPLIFIER
MTT+150
SENSITIVITY
Non-recorded
RECORD/
tape
PLAYBACK MTT-502
SENSITIVITY T kHz,
—10.dB
(IV o-dBY
Table
Voltmeter. reads
•than 617mV
Less than4åOmV
CIRCUIT
Center
Line
ADJUST-
MENT
REMARKS (CHECK)
POINT
L803
L: VR301 Noinial-: 11.5 V
R: VRS02t
(C}02tS7.5
(Metar.'29±3Vb'Jt":;
See that thyelectronic
völtröetei rqading• is
withih renge 'from
490mV to 620mV.
If not, take-the
cedurøs shown
-Table '1
I. Adjust the record
level knobs so that
L:" v_a103 :the 'alectronic
R: VR203
meter-reads
,2. PlaybackihO
tapo recorded and ad
just the smi-variable
Fesistor so thåt the
electronic
read 330 — 460 mV.
Proceduræ
Cut the resistor R136, 8236
Cut the resistor 8134. R234
ADJUSTMENT
TP201
Record Mode
unit
Record
V,
2.5 V)
pro-
in the
Test Tape
volt-
MTT-150
390 mV.
normal
Figure 8—3 PLAYBACK
volt-meter
Low Frequenéy
Osqillag)c
Fiwre
RecOrd/PjaYbaék
Electronic
, Head
Vo Itmeter
OSCILLATORFREQUÉNCY}BIAS C URRENT
Erase
TP301
Mode.
Head
x
Figure 8
-2 ERASE CURRENT
LINE
Playback' ModeOut
unit
Ground
AMP. SENSITIVITY
LINE
In
Attenuator i Record Mode
Uhit
LINE
Playback Mode
Electronic
Out
Vdlirneterö
unit
RECORD/PLAYBACK SENSITIVITY
soloi
VR302
TP301
P201 •
P101
VR301"
Figure 8-5 ADJUSTMENT
krequency d öÜntét
Electronic
Voltmeter
Electronic
Voltmeter.
Non-
recorded
Tape
MIT-502
VN401
R23& Rey.
R '36 R134
VR103•
. VR20Z
POINTS