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1 2 . A D J U S T M E N T S
12.1 MECHANICAL ADJUSTMENTS
Prior to starting mechanical adjustments, clean
the capstan, pinch roller, idler and belt with an
alcohol moistened swab.
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. 72-7).
3. 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 2009 and 3509, replace the pinch
pressure spring (part no. RBH-890).
Tension gauge
( P a r t N o . G G K - 0 4 7 )
Capstan
Pinch roller
Pinch roller arm
Pinch pressure spring
( P a r t N o . R B H - 8 9 0 )
Fig. 12-1
Pinch roller pressure adjustment
12.1.2
Reel Base Torque Adiustment
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 (parb
no. RXB-714), take-up reel assembly (part no.
RXB-715) or the drive arm full assembly (part
no. RXB-376).
Table 1
TU reel base ass'y
Supply reel base ass'y
Playback mode
36 - 6Og.cm
2 - S g . c m
Farst forward mode
8 5 - 1 2 5 g . c m
2 - S g . c m
R e w i n d m o d e
* 2 - S g . c m
85 - 125s.cm
NOTE:
* denotes bach tension torque.
30
12.1,3
Tape Speed Adjustment
1. Connect a frequency counter to the LINE
OUTPUT terminals.
2. Playback the SkHz portion of the STD-301 test
tape. At the beginning of the tape, the fre-
quency
should
Iie between 2995Hz-3O7O
Hz, and may be adjusted by turning the varia-
ble resistor located in the capstan motor
adjustment hole shown in Fig. 12-2. Turning
clockwise increases tape speed, while turning
counterclockwise decreases the speed.
Tape speed increased
Tape speed decreased
e
screwdr:iver
Fig. 12-2
Tape speed adjustment
12.1.4
FF Solenoid Adjustment
1. Put the deck into fast forward mode.
2. Loosen screw O
*d
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 drive
arm full assembly. (See Fig. 12-3)
12.1.5 REW Sole.noid 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 drive
arm tull assembly. (See Fig. 12-3).
/
L
\
Capstan motor
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