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SA-K2
CASSETTE DECK
@
Precautions for adjustment
1. Conduction test of the head by a tester causes the head to be magnetized.
So, it is necessary to demagnetize the head
after conduction test.
2. After replacing the record/playback head, it is necessary to perform adjustments 1 ~ 5.
Head azimuth
(Refer to Fig. 12)
Connect AC EVM of positive side to
chassis
(ground).
Connect AC EVM of positive side to
Playback gain
(Refer to Fig. 12)
Connect AC EVM of positive side to
MER
and connect
negative side to chassis (ground).
Connect AC EVM of positive side
tofleitZ and connect negative
side to chassis (ground).
Record/playback
head angle
VR301
(L channel)
VR302 (R channel)
Recirod bias
current
Record bias
(Refer to Fig. 15)
. Connect AC EVM of positive
side to SIGEQAN and connect
negative side to iil (ground).
. Connect AC EVM of positive side
to | TP303 Enel connect negative
side to chassis (ground).
. Apply
signal of 410 mV
at 1 kHz to aux
input terminal.
VR303
(L channel)
. Measure both channels and adjust levels for
equal output.
. After adjustment lock head adjustment screw
with lacquer.
. Connect AC EVM of positive side
to | TP302 Ege connect negative
side to
(ground).
. Connect AC EVM of positive side
to
and connect negative
side to chassis (ground).
- Apply
Eg
signal of 410 mV
at 1 kHz to aux input terminal.
VR304 (R channel)
Connect AC EVM of positive side
to BULEIM and connect negative side
to Bute
(ground).
VR401
(L channel)
Connect AC EVM of positive side
to MULE
and connect negative
side to [Gal (ground).
VR402 (R channel)
. Set the tape selector switch to 'norma
. Set
the tape selector switch to ''normal"
Position.
. Set the Dolby NR switch to "in" position.
. Playback the 315 Hz (0 dB) frequency
characteristic test tape (Fig. 10). Then adjust
VR301
and VR302 so that the output becomes
560 mV
~ 600 mV.
. Short-circuit the erase head with clip-cord.
2. Set the tape selector switch to 'normal'
position.
. Set a cassette tape on the deck and shift the
unit into recording mode.
. Adjust VR303 and VR304 so that the output
of
(L) and
uefa
(R) are
0.33 mV
~ 0.37 mV.
position.
. Shift the unit into recording mode.
. Adjust VR401
and VR402 for 4.2 mV reading
on EVM.
Standard value
8.1 ~9.1 mV
CrO2
4.9~5.5 mV
Normal
| 4.1 ~4.5 mv
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