Wednesday, November 25, 2015

PANASONIC TX-R26LE7 - TX-R32LE7A SERVICE MODE SELF CHECK AND POWER SUPPLY CIRCUIT

PANASONIC TX-R26LE7 - TX-R32LE7A

SERVICE MODE SELF CHECK AND POWER SUPPLY CIRCUIT 

Self Check
Self-check is used to automatically check the bus lines and hexadecimal code of the TV set. To enter Self-Check mode, keep pressing the STATUS button on the remote control and press the down (-/v) button on the TV set. To exit Self Check, switch off the TV set at the power button.
If the CCU ports have been checked and found to be incorrect or not located then " - - " will appear in place of "O.K.".
Adjustment Method
How to enter Service 1
#Set the Bass to maximum position, set the Treble to minimum position then keep pressing the INDEX button on the remote control and press the down button (-/v) on the TV set, this will place the TV set into the Service Mode 1.
Key Command
# Press the RED / GREEN buttons to step up / down through the functions.
# Press the YELLOW / BLUE buttons to alter the function values, to alter White Rasters use +/- buttons
# Press the OK button after each adjustment has been made to store the required values.
# To exit the Service Mode, press the "N" button.
Keep adjusting sequence: DVCO, Sub-Contrast, other items.
Sub-Contrast - Sub-Contrast 32 - Receive a 80% white level Philips Pattern with correct sound system (B/G, D/K) via aerial input. For SubContrast alignment press "Blue" button, wait until the figure colour is changed from red to black colour. Press the OK.
DVCO – DVCO 63 - Receive a 80% white level Philips Pattern via aerial input. For DVCO alignment press "Blue" button, wait until the figure colour is changed from red to black colour. Press the OK.
White Balance Adjustment
Instrument
# Remote Control
# LCD WB meter (Minolta CA-210 or equivalent)
Condition
# Switch on the TV Set. Enter Service1. Step down to Highlight line and keep the aging time more than 20 minutes.
Procedure
# After aging time above set White Raster No.12 for Highlight and No.4 for Lowlight Press the OK button to store.
# Put Minolta Sensor to the center of the LCD Panel with 25mm gap between Minolta Sensor and LCD Panel. Adjust "x" and "y" values by changing Red and Blue values.
# Press OK button to store setting.
Highlight
x 2850r150
y 2940r150
Lowlight
x 2860r150
y 2900r150
Safety Precautions
General Guide Lines
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed.
3. After servicing, make the following touch current checks to prevent the customer from being exposed to shock hazards.
4. Always ensure panel TKP0E16001 is correctly replaced before returning to customer
Touch-Current Check
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth ground such as a water pipe,.
3. Use Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reserve the AC plug in the AC outlet and repeat each of the above measure.
6. The potential at any point (TOUCH CURRENT) expressed as voltage U1 and U2, does not exceed the following values:
For a. c.: U1 = 35 V (peak) and U2 = 0.35 V (peak);
For d. c.: U1 = 1.0 V,
Note:
The limit value of U2 = 0.35 V (peak) for a. c. and U1 = 1.0 V for d. c. correspond to the values 0.7 mA (peak) a. c. and 2.0 mA d. c. The limit value U1 = 35 V (peak) for a. c. correspond to the value 70 mA (peak) a. c. for frequencies greater than 100 kHz.
7. In case a measurement is out of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer.
POWER SUPPLY CIRCUIT 
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