Teac X-7RMKII - Page 4

X=7R uD X-7ux
2-4 REEL MOTOR TORQUE MEASUREMENT
1. Hold both left and right tension arms in the upper position
using rubber bands.
2. See Fig. 2-4, Measure torques for each operating mode with the
conditions specified in the chart.
3. Since all the torque values are reference values, it is allowable
that the take-up torque during the fast forward or rewind mode
is tkg-cm or more, and that the back tension torque during
these mode is good unless the left or right tension arm are shut-
off.
4, There is no specially provided adjustment, so if any torque cor-
rection are needed, repair or replace defective part(s) and/or
circuit(s).
i Cc D
q : t
spring scale |
—_—~ > ——_—_ ow
radius
TA-1033
Reel torque reference value
Play mode
Mode Torque
Take-up:
(B) in REV 260 + 40g-cm (3.1 ~ 4.20z-inch)
(D) in FWD
Back tension:
(A) in FWD 180 + 40g-cm (1.9 ~ 3.10z-inch)
L (C) in REV
Fast winding mode
Mode | Torque
Take-up: (B) in REW, (D) in F.F. 1100g-cm (15.30z-inch)
Back tension: (A) in F.F., (C) in REW | 50g-cm (0.70z-inch)
NOTE: For torque calculation, refer Fig. 2-3.
Fig. 2-4
2-5 PINCH ROLLER PRESSURE STROKE ADJUSTMENT
1. Set the deck in the forward or reverse play mode.
2. Adjust by turning the pressure storke adj. nut (Fig. 2-5) so that
the clearance between the pin and the stopper cushion is about
1.0mm.
3. Since the clearance is produced at one side (left or right), ad-
justment for this side only is permissible.
= d
_ P
= se 7
Top Panel
Fig. 2-5 Pinch roller pressure stroke adjustments
left capstan right capstan
teft right
pinch roller pinch roller
if m
@ © AS 7 ue TA-1035
stopper cushions
about 1.0 mm
Either the left or right should have a clearance of about
1.0mm.
Fig. 2-6
2-6 PINCH ROLLER PRESSURE MEASUREMENT
NOTES: 1. The explanation below applies to both the left and
right pinch rollers,
2. Both pinch roller pressures are automatically set with
equal value.
1. Hold both the left and right tension arms in the upper positions
using rubber bands, string etc.
2. Set the deck in either play mode with no tape loaded.
3. Attach the spring scale to the pinch roller as shown in the
figure.
4. Draw the pinch roller away from the capstan shaft (in the
direction of a line intersecting the centers of the capstan shaft
and the pinch roller) until the capstan shaft and the pinch
roller are separated.
5. Return the scale back until the pinch roller just begins to turn.
The scale should then be reading as follow.
Reference value: 1.35kg to 1.9kg. (3.0 Ibs to 4.2 Ibs)
6. If the reading is out of specification, replace defective part(s).
There are no adjustable parts.