Teac A-650 - Mechanical Adjustments for TEAC A-650; Pinch Roller Pressure Adjustment; Brake Tension Adjustment

The torque measurements
0
I*
Fig. 5-3 Cassette Torque Meter
5-3. PINCH ROLLER PRESSURE
Specification: 400 g ± 20 g (1 3.5 ~ 1 5.0 oz.)
5.
T-S6O
6.
7.
S l
nr
Z3
Fig. 5-5 Switch Arm Location
5-4. BRAKE TENSION
t
Ji
(
4.
13
For fast forward and rewind
torque measurements:
3.
4.
1.
2.
3.
Switch on POWER.
Press the Switch Arm (A) shown in Fig 5-5 so that the
CASSETTE IN Switch (S509) (see Fig 5-11) will
activate.
Place the deck in the PLAY mode with no tape loaded.
Attach the spring scale to the hole in the Pinch Roller
Ass ’ y as shown.
Gently draw the Pinch Roller away from the Capstan
shaft (in a direction parallel to a line that intersects the
centers of the capstan shaft and the Pinch Roller) until
die Capstan shaft and the Pinch Roller are completely
separated.
Gradually return the scale back until the Pinch Roller
just begins to rotate. The scale should then be reading
approximately 400 ± 20 g (1 3.5 ~ 15.0 oz.).
If die reading is out of specified range, adjust the
tension of die Pressure Spring by bending the tab of
the Pinch Roller Ass ’ y slightly.
1.
2.
C? / 33 .
T-620
Fig. 5-6 Brake Tension Adjustment
5
TORQUE MEASUREMENT USING
THE CASSETTE TORQUE METER
0 ~ 160 g em
(0 ~ 2.2 oz-inch)
By use of a Cassette Torque Meter, it is possible to direcdy
obtain die torque value without calculation, and to do the
measurement simply with no removal of any parts. If
repairs are necessary, the external Cases must be removed.
Load the Meter on the deck and read the pointer indication
on the dial scale for each tape movement operation.
•^■Bend here to adjust
can be easily done with the
Cassette Torque Meter indicated below.
For take-up torque measurement:
Switch on POWER.
Load a TEAC MTT-501 test tape.
Check for excess slack or tightness of the tape when
operation is changed from play, fast forward and re 
wind mode to stop mode, respectively.
If brake action is too “ tight ” or “ loose ” , adjust by
bending the amis of the -Brake Bracket in or out as
shown by the arrows in Fig. 5-6.
©
BE
0 ~ 100 g-cm
(0 ~ 1.4 oz-inch)
-V •7 ’ AV
Fig. 5-4 Pinch Roller Pressure Measurement
3a®
■ v . ..z.