Sharp RT-115H Serviceanleitung Seite 6
• Dolby NR swittfiiOff,-
SETTING
Recor4iIeveI
?9SlTlON
OF SW12réH
•eTape seleétÖrSwiteK.: N örmal
'ÄNd KNOB
Input •SéTector•switch: L'iné
INPUT
ITEM
BIAS
OSCILLATION
FREQUENCY
BIAS
CURRENT
ERASE
CURRENT
PLAYBACK
Test tape
AMPLIFIER
MT T. 150
SENSITIVITY
Non•recorded
RECORD/
tape
PLAYBACK
MTT.502
SENSITIVITY
1 kHz.
—10
dB
(IV=o
dB)
Note:
When
measuring
the
bias current
electronic
voltmeter,
the reading
increased by a thousand
times.
Table
Voltmeter
reed'
More
than
561 mV
Less than
446m V
CIRCUIT
Center
ADJUST-
MENT
REMARKS
(CHECK)
POINT
85±5
kHz
Normal:
16.5 V
L: VR301
R: VR302
{Cru:
24
V,
Metal: 34±3
V)
{Metal:
29 ± 3V)
See
that
the
eldCtronic
voltmeter
reading
within
the range from
446
mV
to 561
If not, take the pro-
geopres
shown
in the
rabie Sl.
1
Adjust
the record
level
knobs
so that
L: VR103
the
electronic
R: VR203
meter
reads
350
Playback
the normal
2.
tape recorded
just the semi-variable
resistor
so that
electronic
volt-meter
read
350
m V.
or erase current
with
on the voltmeter
should
Procedure
Cut
the
resistor
R150.
R250
Cut
the
resistor
R148,
R248
MAIN
a No
Eros
•
SND
TO
Figure
ADJUSTMENT
R:CNPI-O Pin
Record/PtaVback Elettronic
Recoid
Mode
H ejd
Unit
R:CNPI
L:CNPI
6
Pin
Figure
Record
Mode
Uriit
CNPI-
iS
mv.
Test Tape
MTT,ISO
volt-
m V.
Figure 6
—3 PLAYBACK
and ad-
the
Low Frequency
Oscillator
Attenuator
the
be
Electronic
Voltmeter
Figure 6—4 RECORD/PLAYBACK
P.W.B.
RECORD
vuoz
ECONO
CNPC
VR203
—R250—
NR
METAL
tcrOz—1
{REC
VOLI
OFF
ADJUSTMENT
POINTS
Pin
Voltmeter
BIAS OSCILLATION
FREQUENCY
[BIAS
CURRENT
CNPl-OPin
Erase
Head
x
@Pin
Figure 6—2 ERASE CURRENT
Electronic
Line Out Socket Voltmeter
sol-c
or
D
Playback Mode
unit
GND
AMP.
SENSITIVITY
Line
In Socket
SOI-A
or
B
Record
Mode
Line
Out
Socket
SOI -C
PlaybackMode
unit
SENSITIVITY
LINE
Cur
TWI TY
'PLAYBACK
RZ4—
mz4-
-R240—
Frequency COunter
Electronic-
Voltmeter
Non-
recorded
Tape
MTT-502
