LC-12A2E (serv.man2). Introduction , Contents and - Page 1-13 - Sharp TV Service Manual (repair manual). Page 9

4-1. Connect the 81 pin and 82 pin of IC2001 (microcomputer) to GND, and turn on the power.
4-2. Select the model name (A2E/A2E(K)).
4-3. Select the inch size (12).
4-4. Return the 81 pin and 82 pin of IC2001 (microcomputer) to the original state.

      Transmission data

6-1. +B adjustment

1) Receive the E-12CH (PAL color bar).
2) Adjust the voltage of the 49 pin of SC401 to 5.00V

±

0.02V.

Note: Since 5.0V is a reference voltage of all power voltage, adjust it precisely.

6-2. 38.9-VCO adjustment

1) Set the sound system to the B/G mode.
2) Send the CW signal of 38.9MHz, 90dB

µ

V from SG to TP3201 (IF-OUT).

3) Adjust the L3231 coil so that a voltage of 2.5

±

0.2V is obtained at TP3203 (AFT).

    Note 1: The input impedance of the digital voltmeter must be 1M

Ω

 or more.

    Note 2: To adjust L3231, use a non-magnetic driver.
    Note 3: No signal must not be input from the antenna.

6-3. 33.9-L’-VCO adjustment

1) Set the sound system to the L’ mode.
2) Send the CW signal of 33.9MHz, 90dB

µ

V from SG to TP3201 (IF-OUT).

3) Adjust the R3233 volume so that a voltage of 2.5

±

0.2V is obtained at TP3203 (AFT).

    Note 1: The input impedance of the digital voltmeter must be 1M

Ω

 or more.

    Note 2: After performing the adjustment of the item 6-2, execute this item.
    Note 3: No signal must not be input from the antenna.

6-4. RF-AGC cut-in adjustment

1) Set the sound system to the B/G mode, and receive the E-12CH (PAL color bar).
2) Set the antenna input level to 56dB

µ

V (75

Ω

 termination, QP value).

3) Turn the R3231 (AGC volume) clockwise so that the voltage of the TP3202 (RF-AGC terminal) becomes

maximal.

4) Turn it counterclockwise, and adjust the AGC terminal voltage to the point that is lower than the maximal

voltage by 0.5

±

0.2V.

6-5. Opposed bias adjustment

1) Receive the monoscope pattern.
2) Adjust the "COM BIAS" so that the contrast of the stairway-shaped part may become the biggest.

Model

E2PROM adress

Item

Write Data

OSD Display