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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.
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).
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.
Figure 8-4
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