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12. ADJUSTMENTS
12.1
MECHANICAL
ADJUSTMENTS
Prior to starting mechanical
adjustments,
clean
the capstan, pinch roller, idler and belt with an
alcohol moistened swab.
e For items
not specified, adjust both
decks
A
and B.
12.1.1.
Pinch Roller Pressure Adjustment
1.
Put the tape deck into playback mode without
loading a cassette half.
2.
Gently push against the pinch roller arm with
a tension gauge (service part no. GGK-047) and
separate
the
pinch
roller
slightly
from
the
capstan. (See Fig. 12-1).
38. Then ease the pinch roller back onto the cap-
stan, and read the value when the pinch roller
starts
to
rotate.
If the reading
fails to lie
between
200g
and
350g, replace
the pinch
pressure spring (part no. RBH-893).
Tension gauge
(Part No. CGK-047)
Capstan
Pinch roiler arm
'
Pinch pressure spring
{Part No.
RBH-893)
Fig. 12-1
Pinch roller pressure adjustment
12.1.2
Reel Base Torque Adjustment
Measure
the reel base torque during playback,
fast forward and rewind modes with a cassette type
torque
meter
(service
part no.
GGK-056).
The
measured values should lie within the ranges listed
below in Table 1. If the measured values lie outside
these ranges, replace the supply reel assembly (part
no.
RXB-377),
take-up
reel assembly
(part no.
RXB-360)
or the full drive arm
assembly
(part
no. RXB-376).
eS
Os
NOTE:
* denotes back tension torque.
12.1.3
Tape Speed Adjustment
e When
adjusting tape speed on the deck A side,
set the pinch control knob
to the center click-
stop position.
1.
Connect
a frequency
counter
to the PLAY
terminals.
2.
Play the 8kHz
portion
of the STD-301
test
tape. At the beginning
of the tape, the fre-
quency should lie between
3000Hz
and 3010
Hz, and may be adjusted by turning the varia-
ble
resistor
located
in
the
capstz:
motor
adjustment
hole shown
in Fig. 12-4- surning
clockwise
increases
tape speed, while turning
counterclockwise decreases the speed.
Tape speed increasad
Tape speed decreased
OC screwdriver
Fig. 12-2
Tape speed adjustment
12.1.4
REC Detector Switch Adjustment
e Perform this adjustment only on deck P
1.
Prepare
a cassette half with
the er.
re pre-
vention
tabs
intact,
and
one
with
the tabs
broken off.
2.
Adjust the record prevention lever (shown by
the arrow in Fig. 12-3) by bending so that the
lever switch is on when a half without tabs is
loaded, and off when a half with tabs is loaded.
Side plate L assembly
Chassis
Record prevention
lever
Lever switch
(REC detector
switch}
AS
<<
Fig. 12-3
REC detector switch adjustment
12.1.5
Detection Switch Adjustment
e For Deck A side
Insert the STD-601 test tape to turn the lever
switch off. When the STD-604 test tape is inserted,
the lever switch should be turned on. If the lever
switch
(for
chrome
tape
detection)
does
not
operate properly, gently bend the section indicat-
'ed by the arrow so that it operates properly (see
Fig. 12-4).
Side panel assembly
Chassis
'Chrome detection
CU Lever
Lever switch (chrome
detection switch)
Fig. 12-4
Adjustment of chrome detection switch
e For Deck B side
When
the STD-601
test tape is inserted, the
slide switch should turn off and when the STD-604
test tape is inserted, the slide switch should turn on
(see
Fig. 12-5). If this switch
does not operate
properly, loosen screw
@
in Fig. 12-5 and adjust
the position
of the detection
panel as required.
Detection panel
Slide switch
Fig. 12-5
Adjustment of detection assembly
12.1.6
FF Solenoid Adjustment
1.
Put the deck into fast forward mode.
2. Loosen
screw
@
and
adjust
the
mounting
position of the FF solenoid (plunger solenoid
F) so that the square hole in the full reel base
assembly
is flush against the boss of the full
drive arm assembly. (See Fig. 12-6)
12.1.7
REW Solenoid Adjustment
1.
Put the deck into rewind mode.
2. Loosen
screw €&) and
adjust
the
mounting
position of the REW solenoid (plunger solenoid
R) so that the square hole in the full reel base
assembly
is flush against the boss of the full
drive arm assembly. (See Fig. 12-6).
Boss (Driving arm full assembly)
REW position
Contacting ele
FF position
>
Contacting
Idler gear
Supply reel
base assembly
TU reel base
assembly
Idler gear
Supply ree! base assembly
Supply reel base assembly
FF solenoid (plunger solenoid F})
REW solenoid (plunger iolenoid R}
Fig. 12-6
FF and REW solenoid adjust t®
S52
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