Teac A-400 - Torque Measurement Procedures

3-2. TAKE-UP TORQUE MEASUREMENT
The take-up torque should be: 45 ~ 70 g-cm (0.6 ~ 1.0
oz*inch)
Open the Cassette Holder door fully to the left.
Remove the Cassette Guide Plate. (See 2-7A in Section 2-7)
Switch the POWER switch to the ON position.
Set the Cassette Reel Adapter (22 mm Dia.), connected to
the spring scale (Q ~ 70 g, or 0 ~ 2.5 oz) by the string, on the
Take-up Reel Table as shown in Fig. 15.
Place the deck in the PLAY mode.
6. Allow the rotation of the Reel Table to draw the scale
Pons
n
Take-up Reel Table
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.
7. The scale should indicate 41 ~ 64 g (1.4 ~ 2.2 02).
This corresponds to a torque of 45 ~ 70 g:cm (0.6 ~ 1.0
oz‘inch). For the torque calculation, refer to Fig. 16.
8. If the reading is out of specified range, clean the driving
surfaces of the Reel Table Assy, the Play Idler and the
Flywheel with the TEAC TZ-261B Rubber Cleaner or with
pure alcohol (Fig. 17) ;
9. If the above cleaning is ineffective for torque correction,
replace the Reel Table Assy. (See Section 2-7)
3-3. FAST FORWARD TORQUE MEASUREMENT
The fast forward torque should be: 80 g-cm (1.1 oz-inch) or
more
1. Repeat step 1 to 3 in 3-2 above.
2. Set the Cassette Reel Adapter (22 mm Dia.), connected to
the spring scale (0 ~ 200 g, or 0 ~ 7.0 oz) by the string, on
the Take-up Reel Table as shown in Fig. 15.
3. Place the deck in the FF mode.
4. Permit the revolution 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.
5. The scale should indicate 73 g (2.6 oz) or more.
This corresponds to a torque of 80 g-cm (1.1 oz-inch) or
more. .
6. If the indication is out of specified range, clean the driving
surfaces of the Reel Table Assy, the Fast Wind Idler Assy and
the Flywheel with the TEAC TZ-261B Rubber Cleaner or
with pure alcohol. (Fig. 17)
7. |f the above cleaning is ineffective for the torque correction,
replace the Fast Wind Idler Assy. (See Section 2-10)
10
- /Fast Wind Idier Assy
Supply Reel Table { 7-406
Fig.
15
Take-up/Fast
Forward
Torque
Measurement
Cassette Reel Adapter
T-409
T = Fxr For example:
T: torque (g-cm) if F=41g
F: force (g)
r: radius (cm) T=Fxr
=41x 1.1
= 45 (g-cm)
;
Consequently
the
torque
is
45
g-cm.
Fig.
16
Torque
Calculation
Method
Flywheel
Play Idler
Take-up Reel Table
Capstan Belt
~
xe
‘Our
Ne
a
mess
Motor
Supply
Reel
Table
7-386
Fig. 17 Tape Drive System