Panasonic CT-27G6UE Manual de servicio - Página 5

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IMPORTANT: To protect against possible damage to

the solid state devices due to arcing or static

discharge, make certain that all ground wires and CRT

DAG wire are securely connected.

CAUTION: The power supply circuit is above earth

ground and the chassis cannot be polarized. Use an

isolation transformer when servicing the Receiver to

avoid damage to the test equipment or to the chassis.

Connect the test equipment to the proper ground ( ) or

(

) when servicing, or incorrect voltages will be

measured.

WARNING: This Receiver has been designed to meet

or exceed applicable safety and X-ray radiation

protection as specified by government agencies and

independent testing laboratories.

To maintain original product safety design standards

relative to X-ray radiation and shock and fire hazard,

parts indicated with the symbol

must be replaced with identical parts. Order parts from

the manufacturer's parts center using the parts

numbers shown in this service manual, or provide the

chassis number and the part reference number.

For optimum performance and reliability, all other parts

should be replaced with components of identical

specification.

X-Ray Protection Circuit Check &

Adjustments

This test must be performed as final check before the

Receiver is returned to the customer. If voltages are

out of tolerance, immediate service and correction is

required to insure safe operation and to prevent the

possibility of premature component failure.

Equipment:

1. Isolation transformer.

2. High voltage meter.

3. Short jumper.

4. Jumper diode (same as D823, PN S3L60P154004).

Procedure:

1. Connect the Receiver to an isolation transformer.

2. Apply a monoscope pattern.

3. In Service Mode (see Service Mode Section in this

on the schematic

4. Measure TP5 (located near the tuner). Compare

5. Exit Service Mode and shut it OFF.

6. Connect the short jumper between TPD16 and

7. Connect the jumper diode between TPD14 and

8. Apply 75VAC to the input of the isolation

9. Turn Receiver ON.

10. Set PICTURE and BRIGHTNESS to minimum.

11. Slowly increase the voltage at the input of the

12. Turn Receiver OFF and remove jumper & diode.

- 5 -

Diode should be rated a minimum of 150V.

Turn Receiver ON.

manual) select register Cb.

the measured value to the left column of the table

below. Set Cb with value from the right column

corresponding to the measured level at TP5.

Example, if the measured level at TP5 is 1.03V, set

Cb to 03.

TP5 MEASUREMENT

0 ~ 0.93V

0.93 ~ 0.97V

0.97 ~ 1.01V

1.01 ~ 1.05V

1.05 ~ 1.09V

1.09 ~ 1.13V

1.13 ~ 1.17V

1.17 ~ 1.21V

TPD17.

TPD15 (cathode connected to TPD14, anode

connected to TPD15, See Fig. 4 for locations).

transformer.

isolation transformer and confirm HHS voltage

measure 35.0KV for 25" models, 35.8KV for 27"

models using SAMSUNG CRT or 35.0KV for 27"

models using AMEC CRT when the Receiver starts

to go out of sync.

SET Cb TO (HEX)