Teac A-450 - TAKE-UP TORQUE; FAST FORWARD TORQUE

4-2. TAKE-UP TORQUE
Specification: 40 ~ 70 g-cm (0.6 ~ 1.0 oz-inch)
1.
2.
3.
mn
Rotate the cassette holder away from the reel tables.
See 3-7 section.
Switch on POWER.
Set the Cassette Reel Adapter (22 mm Dia.), connected
to the spring scale (0 ~ 70 g, or 0 ~ 2.5 oz.) by the
string as shown in Fig. 4-2 on the Take-up Reel Table.
Place the deck in the PLAY mode.
Allow the rotation of the Reel Table to pull the scale
pointer toward the Adapter with the spring scale
moving in the same direction at nearly the same speed
as the tape would be moved, and obtain the scale
reading. Make reading only when the pointer becomes
stable.
The scale should indicate Force of 36 ~ 64 g (1.3 ~
2.2 0z.).
This corresponds to a torque of 40 ~ 70 g-cm (0.6 ~
1.0 oz-inch). For the torque calculation, refer to Fig.
4-3.
If the reading is out of specified range, clean the
driving surfaces of the Reel Table Ass’y, and all other
driving parts relative to the take up torque function
with the TEAC TZ-261B Rubber Cleaner or with pure
alcohol
If the above cleaning is ineffective for torque correc-
tion, replace the Reel Table Ass’y. (See Section 3-7)
4-3. FAST FORWARD TORQUE
Specification: 100 g*cm (1.4 oz-inch) or more
1,
2:
12
Repeat step 1 and 2 in 4-2 above.
Set the Cassette Reel Adapter (22 mm Dia.), connected
to the spring scale (0 ~ 200 g, or 0 ~ 7.0 02.) by the
string as shown in Fig. 4-2, on the Take-up Reel Table.
Place the deck in the Fast Forward mode.
Allow the rotation of the Reel Table to pull the scale
pointer toward the Adapter, and obtain the scale
reading. Do not read until the pointer becomes stable.
The scale should indicate 91 g (3.2 oz.) or more.
This corresponds to a torque of 100 g-cm (1.4 0z-inch)
or more.
If the indication is out of specified range, clean the
driving surfaces of the Reel Table Ass’y and all other
driving parts relative to the fast forward torque
function with the TEAC TZ-261 B Rubber Cleaner or
with pure alcohol.
If the above cleaning is ineffective for the torque
correction, bend the spring (see Fig. 4-5) to get the
specified torque value.
Take-up Reel Table
Cassette Reel Adapter (22mm Dia.)
oo
Supply
Ree!
Table
T-406
Fig. 4-2 Take-up/Fast Forward Torque Measurement
Cassette Reel Adapter
T-409
T=Fxr For example:
T: torque (g*cm) If F=419
F: force (g)
r: radius (cm) T = Fxrer
= 41x1.1
= 45 (g*cm)
Consequently the torque is 45 g*cm.
Fig. 4-3 Torque Calculation Method
Cassette Reel Adapter (22mm Dia.)
; T-405
Fig. 44 Rewind Torque Measurement