Teac X-3R - BRAKE TORQUE; REEL MOTOR TORQUE

X:3R
24 BRAKE TORQUE
NOTE: Before making any brake adjustments or measurements,
make sure the power is off,
1. Mount an empty 7” reel onto either reel table and attach a
spring scale to the reel with a string.
2. Smoothly pull the scale away from the reel under test and note
the torque value when the reading on the scale is steady. The
proper torque values are given in the chart below.
3. Follow steps 1 and 2 for each measuring condition; i.e., (A)
through (D) in Fig. 2-4.
4, If the forward-direction torque is not correct, change the hook-
ing position of the spring hanger (reference (D) in Fig. 2-3) for
the corresponding brake requiring adjustment. If, after the for-
ward-direction torque has been properly adjusted and the reverse-
direction torque is not correct, or the forward-direction torque is
still not correct, check to see if the brake felt pad is worn, and
also check that the brake mechanism is properly aligned as ex-
plained in Section 2-3, “Brake Mechanism”. If necessary, replace
the entire reel table.
Radius
1200 — 1400 g-cm
(16.7 — 19.4 02-inch)
i Forward direction (B) (C)
4
|
500 — 700 g-cm
(6.94 — 9.72 oz-inch)
Reverse direction (A) (D)
150 g-cm
Left/Right deviation (2.09 oz-inch)
Torque calculating formulas:
1. Torque (in g-cm or oz-inch)
= Force or Weight (in g or 0z) x Radius (in cm or inch)
2. Conversion of g-cm to oz-inch:
g-cm x 0.0139 = oz-inch
Fig. 2-4
2-5 REEL MOTOR TORQUE
TAKE-UP TORQUE
1.
2.
Hold the right tension arm up using a rubber band.
Mount an empty 7” reel onto the right (left) reel table, and
attach a spring scale to the reel with a string.
Place the deck in the forward (reverse) play mode.
Allow the rotation of the reel to slowly pull the scale toward the
reel,
Hold the spring scale with enough force to allow a steady reading.
Measure the take-up torque. The proper values are given in the
chart below.
There is no specially-provided adjustment for take-up torque, so
if correction is needed, repair or replace the defective part and/
or circuit.
,
| Spring Scale
Radius
330 to 470 g-cm
(4.58 to 6.53 02-inch)
220 to 280 g-cm
(3.06 to 3.89 oz-inch)
(B) in REV
(D) in FWD
(A) in FWD
(C) in REV
Take-up:
Back tension:
NOTE: For torque calculation, refer to the formulas provided
in Fig, 2-4.
Fig. 2-5