SHARP LC-12A2E
Manual de Servicio

LC-12A2E

[4] Initialization
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.

[5] Transmission data by model
Transmission data
Model E2PROM adress Item Write Data OSD Display

[6] Adjustment
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, 90dBµV 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� 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, 90dBµV 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� 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 56dBµV (75� 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.

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