Preparation For Adjustment; Checking Torque - Zenith XBV323 Series Service Manual

DECK MECHANISM ADJUSTMENT
2. Preparation for Adjustment (To set the
Deck Mechanism to the Loading state
without inserting a Cassette Tape).
1) Unplug the Power Cord from the AC Outlet.
2) Disassemble the Top Cover and Top Plate Assembly.
3) Plug the Power Cord into the AC Outlet.
4) Turn the Power S/W. Push the Stop Lever of the CST
Holder Assembly to the back for Loading without the

3. 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
SRK-VHT-303
Item
Fast Forward
Fast Forward Torque
Rewind
Rewind Torque
Play
Play Take-Up Torque
Review
Review Torque
NOTE:
The Values are measured by using a Torque Gauge and
Torque Gauge Adaptor with the Torque Gauge affixed.
• Cassette Torque Meter (SRK-VHT-303)
Fig. C-3-2
Test Conditions
(Mechanism Condition)
• Play (FF) or Review (REW) Mode
Mode
Test Equipment
Cassette Torque Gauge
Cassette Torque Gauge
Cassette Torque Meter
Cassette Torque Meter
4-14
Tape.
Cover the Holes of the End Sensors at the both sides of
the (L) Side Bracket and Door Bracket Assembly to pre-
vent sensing light.
Then The Deck Mechanism drives to the Stop Mode.
In this case, The Deck Mechanism 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 Mode
and can not detect the Reel Pulses.
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 of it (Fig. C-3-1).
Measurement Reel
Take-Up Reel
Supply Reel
Take-Up Reel
Supply Reel
NOTE:
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.
• Torque Gauge (600g.cm ATG)
Fig. C-3-1
Measurement Values
More than 400g/cm
More than 400g/cm
40~100g/cm
120~210g/cm
Torque Gauge
Torque Gauge
Adaptor
Reel Table