Sharp 13K-M150 Manual de servicio - Página 7

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INSTALLATION AND SERVICE INSTRUCTIONS

Note: (1)

When performing any adjustments to resistor controls and transformers use non-metallic

screwdriver or TV alignment tools.

(2)

Before performing adjustment, TV set must be on at least 15 minutes.

CIRCUIT PROTECTION

The receiver is protected by a 4.0A fuse (F701),

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

line input.

X-RADIATION PROTECTOR CIRCUIT

TEST

1. After service has been performed on the horizontal

deflection system, high voltage system, B + system,

test the X-Radiation protection circuit to ascertain

proper operation as follows:

1) Apply 120V 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) Select a local channel.

4) Connect a digital voltmeter to TP653 and make sure

that the voltmeter reads 21.3V ±1.5V.

5) Apply external 28.9V DC at TP653 by using an

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.

HIGH VOLTAGE CHECK

High voltage is not adjustable but must be checke

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 120V AC

line voltage, with strong air signal or properly tuned

in test signal.

3. Set service mode on (See next page.),Service

No.S19 and Bus data "01" (Y-mute on).

4. The voltage should be approximately 24.0kV (at zero

beam)."

If a correct reading cannot be obtained, check circuitry

for malfunctioning components. After the voltage

test,make Y-mute off (normal mode).

13K-M100/150

CK13M10/15