LG Electronics TL-AT130M service manual Checking Torque, Test Equipment/ Fixture Test Conditions

DECK MECHANISM ADJUSTMENT

2.Preparation for Adjustment (To set the Deck Mechanism of the loading state

without 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.

Cover the holes of the End Sensors at the both sides of the Chassis to prevent a light leak.

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 State and can not be detected the Reel Pulses.

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	Test Conditions	Checking Method
	(Mechanism Condition)

•Torque Gauge(600g/cm ATG) • Play (FF) or Review (REW) Mode • Perform each Deck Mechanism mode without

• Torque Gauge Adaptor			inserting a cassette tape(Refer to above No.2
• Cassette Torque Meter			Preparation for Adjustment).
SRK-VHT-303		• 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).
Item	Mode	Test Equipment		Measurement Reel	Measurement Values
Fast Forward Torque	Fast Forward	Cassette Torque Gauge		Take-Up Reel	More than 400g/cm
Rewind Torque	Rewind	Cassette Torque Gauge		Supply Reel	More than 400g/cm
Play Take-Up Torque	Play	Cassette Torque Meter		Take-Up Reel	40~100g/cm
Review Torque	Review	Cassette Torque Meter		Supply Reel	120~210g/cm
NOTE:		NOTE:

The values are measured by using a Torque Gauge and Torque Gauge Adaptor with the Torque Gauge affixed.

The torque reading to measure occurs when the tape abruptly changes direction from Fast Forward to Rewind Mode, when quick braking is applied to both Reels.

• Torque Gauge (600g.cm ATG) • Cassette Torque Meter (SRK-VHT-303)

Torque Gauge

Torque Gauge Adaptor

Reel Table

S

R

T- H -V K

S

300
0	50

250

200
150	SRK
VIDEO
CASSETTE
TORQUE
METER
VHT-
303

K -V H T - T
SR	0
	50
	100
	150
	200
	250
	300

Fig. C-3-1

Fig. C-3-2

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