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Tracking
adjustment screw
oy
Screwdriver
12) Read
the current
indicated
on
both the
ammeters
connected in steps 6) and 7).
13) If the two current indications are not equal adjust the
Base
Tracking Adjustment screw. When these two measure-
ments
are
equal they
should
be in the range
of 8
to 20uA.
;
14) Disconnect
the ammeters
and reinsert the lead wires
Tonearm
vein)
==
&) var0e
|
B
to CONN-4.
Reconnect
CONN-4
to the main
P.C.B.
7-2 Adjustment of Tracking Servo Amplifier
1) The
tracking
servo
amplifier gain is to be adjusted
only after adjustment 7-1) has been completed.
2) Connect a DC voltmeter between
Pin 12 of the main
P.C.B.
and
ground
(Pin
10). Adjust
VR101
for a
reading
of 5.5 volts. Then
with the voltmeter
con-
nected
between
Pin 13 and ground adjust VR102 for
5.5 volts on the voltmeter.
After completing
the adjustments
apply lock-tight to
the semi-fixed resistors.
Reconnect
the lead wire to Pin 9 to restore platter
operation. Re-engage the drive belt to restore horizontal
drive motor operation.
3
—
4
—
Fig. 14
Voltmeter
f
t
13126
7
CONN 4
9 8
MAIN P.C.B.
Tracking Servo Amplifier Adjustment
Fig. 15
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