Sharp 14V-R70M Servis Kılavuzu - Sayfa 5

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INSTALLATION AND SERVICE INSTRUCTIONS

Note:

(1) When performing any adjustments to resistor controls and transformers, use non-mettalic

screw drivers or TV alignment tools.

(2) Before performing adjustments, the TV set must be on at least 15 minutes.

CIRCUIT PROTECTION

The receiver is protected by a 3.15A fuse (F701),

mounted on PWB-A, wired into one side of the A C

line input.

X-RADIATION PROTECTOR CIRCUIT TEST

After ser vice has been perf ormed on the horizontal

deflection system, high v olta ge system, B+ system,

test the X-Radiation pr otection cir cuit to ascer tain

proper operation as f ollo ws:

1. Apply 110~230V AC using a variac transformer for

accurate input voltage.

2. Allow for warm up and adjust all customer controls

for normal picture and sound.

3. Receive a good local channel.

4. Connect a digital voltmeter to TP653 and make sure

that the voltmeter reads

5. Apply external 27V DC at

external DC supply, TV must be shut off.

6. To reset the protector, unplug the AC cord and make

a short circuit between TP651 and TP652. Now make

sure that normal picture appears on the screen.

7. If the operation of the horizontal oscillator does not

stop in step 5, the circuit must be repaired before the

set is returned to the customer.

26 ±1.1V.

TP653 by using an

HIGH VOLTAGE CHECK

High v oltage is not adjustab le but m ust be c hecked

to verify that the receiver is operating within safe

and efficient design limitations as specified checks

should be as follows:

1. Connect an accurate high voltage meter between

ground and anode of picture tube.

2. Operate receiver for at least 15 minutes at 110~230V

AC line voltage, with a strong air signal or a properly

tuned in test signal.

3. Enter the service mode and set Y-mute ON by using

Service R/C.

4. The voltage should be approximately 25.5 kV (at zero

beam).

If a correct reading cannot be obtained, check circuitry

for malfunctioning components. After the voltage test,

make Y-mute off to the normal mode.

14V-R70M