Tascam 388 Studio 8 - Pinch Rollar Pressure

3. Follow steps 1 and 2 foreach measuring con-
dition; i.e., (A) through (D) in Fig. 1-3-3.
4. If the forward-direction torque is not correct,
change the hooking position of the spring
hanger (reference (D) in Fig. 1-3-2) for the
corresponding brake requiring adjustment. If,
after the forward-direction torque has been
properly adjusted, the reverse-direction torque
is not correct, or the forward-direction
torque is stiii not correct, replace the brake
feit pad with a new one after cleaning the
inner side of the brake band with a cleaning
alcohol, and aiso check that the brake mech-
anism is properly aligned as explained in
Section 1-3-2, "Brake Mechanism". If neces-
sary, replace the entire reel table.
Spring
Scale
Forcé
Radius
AO
Fig. 1-3-3
1-3-4. Pinch Roller Pressure
Note: Pinch roller pressure is supplied by the
pinch roller spring arm and it is most
important that the solenoid plunger be
fully bottomed before taking pressure
measu remen t.
1. Hold the right tensión arm up with a rubber
band, string, etc.
2. Place the deck in the reproduce mode without
threading the tape.
3. Attach a spring scale to the pinch roller as
shown in Fig. 1-3-4.
4. Pulí the pinch roller away from the capstan
shaft until the pinch roller just stops rotating.
The scale should then be read 1.3 kg to 1.7 kg
{2.9 Ibsto 3.74 Ibs).
5. If you get a reading other than what should
be indicated, make the necessary adjustments
through the adjust screws.
1.0 — 2.0 mm
Adjust screws
: B
—•
0
Pinch Roller
Forward direction
(B) (C)
1,000 — 1,500 g-cm
(13.9 — 20.9 oz-inch)
Reverse direction (A)
(D) (Referencevalúes)
500 — 700 g-cm
(6.9 — 9.7 oz-inch)
Left/Right deviation
500 g-cm
(6.95 oz-inch)
Fig. 1-3-4
Torque calculating formulas:
1. Torque (in g-cm or oz-inch)
= Forcé or Weight (in g or oz) x Radius
(in cm or inch)
2. Conversión of g-cm to oz-inch:
g-cm X 0.0139 = oz-inch
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