Zenith XBV243 Service Manual page 50

PREPARATION FOR ADJUSTMENT
(To set the Deck Mechanism to the Loading state with-
out inserting a Cassette Tape).
1) Unplug the Power Cord from the AC Outlet.
2) Disassemble the Top Cover and Plate Assembly Top.
3) Plug the Power Cord into the AC Outlet.
4) Turn the Power S/W on and push the Lever Stopper
of the Holder Assembly CST to the back for Loading
the Cassette without Tape.
CHECKING TORQUE
Purpose: To insure smooth Transport of the Tape during each Mode of Operation.
If the Tape Transport is abnormal, then check the Torque as indicated by the chart below.
Test Equipment/ Fixture
Torque Gauge (600g/cm ATG)
Torque Gauge Adaptor
Cassette Torque Meter
NOTE:
The Values are measured by using a Torque Gauge and
Torque Gauge Adaptor with the Torque Gauge a ffixed.
Cassette Torque Meter
Fig. C-3-2
VR168 - 923-03485
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MECHANISM - VCR
Test Conditions
(Mechanism Condition)
Play (FF) or Review (REW) Mode
The Torque reading to measure occurs when the Tape
abruptly changes direction from Fast Forward of Rewind
Mode, when quick bracking is applied to both Reels.
4-14
Cover the Holes of the End Sensors at both sides of
the Bracket Side (L) and Bracket Assembly Door to
prevent a light leak. Then the Deck Mechanism drives
to the Stop Mode. In this case, The Deck Mecha-
nism can accept inputs of each mode, however the
Rewind and Review Operation can not be performed
for more than a few seconds because the Take-up
Reel Table is in the Stop State and the reel pulses
can not be detected.
Checking Method
Perform each Deck Mechanism Mode without
inserting a Cassette Tape (Refer to above No.2
Preparation for Adjustment).
Read the Measurement of the Take-up or Supply
Reels on the Cassette Torque Meter(Fig. C-3-2).
Attach the Torque Gauge Adaptor to the Torque
Gauge and then read the Value (Fig. C-3-1).
NOTE:
Torque Gauge (600g.cm ATG)
Fig. C-3-1
Torque Gauge
Torque Gauge
Adaptor
Reel Table
D35E COMBO - SERVICING