Sharp SG-290H User Manual

SG-290H/HB
©
PINCH ROLLER PRESSURE CHECK
1) Place the unit in play mode.
2) Push the pinch roller, at the point @) shown in Figure 8—1,
by using a tension gauge (500g .) so that it will come off
the capstan. Then, slowly release the tension until the pinch
roller hits the capstan again (i.e., the pinch roller is about
to rotate again). Check, then, the tension gauge is reading
270g. to 330g.
3) If the reading is outside the range of 270g. to 330g .,
bend the pinch roller spring or replace.
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
1) Connect instruments as shown in Figure 8—2.
2) Set the mode selector switch at “TAPE” position.
3) Put a test tape (TEAC, MTT-114, 10 kHz 250 pWb/mm,
—10 dB prerecorded) into the unit and play it.
4) Adjust the head azimuth adjusting screw so that the
electronic voltmeter reading is maximal.
Note:
If a dual-trace oscilloscope is available, perform the adjust-
ment so that the reading of the oscilloscope is maximal and
with the least phase/output difference between channels.
After
the
work,
check
that
the
head
azimuth
adjusting
screw
has been secured completely.
MECHANICAL
TAPE SPEED ADJUSTMENT
1) Connect instruments as shown in Figure 8—3.
2) Play a test tape (TEAC, MTT-111, 3 kHz prerecorded).
3)
Adjust
the
semi-variable
resistor
in
the
motor
so
that
the
frequency
is
2965
~
3015Hz
on
frequency
counter.
ADJUSTMENT
TENSION GAUGE
(500 g }
CAPSTAN
PINCH ROLLER
Figure 8—1
DUAL- TRACE
OSCILLOSCOPE
HEADPHONES
PLAYBACK Lch
TEST TAPE
META ELECTRONIC
VOLTMETER
HEADPHONES
Rech
Figure 8—2
REC/PB
HEAD
WW
Screwdriver
REC/PB
HEADPHONES FREQUENCY
PLAYER ADJUSTMENT
ADJUSTMENT OF TONEARM AUTOMATICALLY
RETURN POSITION (Refer to Figure 8-4)
Play a record and check the automatically return starting
position.
If the tonearm is not returned at its normal position; adjust so
that it is automatically returned at around the center of the
lead-out groove of a record while rotating the adjusting
screw ® clockwise or counterclockwise by a bladed screw-
driver.
ADJUSTMENT OF TURNTABLE SPEED
1. Set the stroboscopic viewer on the turntable.
2. Set the turntable speed to 33-1/3 rpm, and rotate the
turntable.
(Change over the turntable speed while rotating the
turntable.)
Adjust the semi-variable resistor® independently so that
Stripe patterns on the stroboscopic viewer appear to be
stationary.
HEAD
6:
ayBack
COUNTER
ae
qu
:
TEST
TAPE
Brey
Motor
ee
Figure
8—3
TONEARM
Figure 8-4

Sharp SG-290H Specifications

General

Brand	Sharp
Model	SG-290H
Category	Turntable
Language	English