SANYO DP42840 / DP46840 / DP52440 SERVICE MODE AND POWER SUPPLY CIRCUIT
SANYO DP42840 / DP46840 / DP52440
SERVICE MODE AND POWER SUPPLY CIRCUIT
Enter the Service Menu:
1. Turn off the receiver and disconnect the AC power supply.
2. While pressing the Volume (–) button on the television, reconnect the AC power supply. The Service Menu will now appear. The remote can now be used to make adjustments. See Figure below.
2. While pressing the Volume (–) button on the television, reconnect the AC power supply. The Service Menu will now appear. The remote can now be used to make adjustments. See Figure below.
Service Adjustments:
# Press the Cursor ▲ and ▼ key to select the desire service menu item you want to adjust. See page 4 for the On-screen Service Menu.
# Use the Cursor or key to adjust the data. The or key will increase or decrease the data sequentially.
Exit from the Service Menu:
# Press the MENU key to turn off the Service Menu display.
# Press the Cursor ▲ and ▼ key to select the desire service menu item you want to adjust. See page 4 for the On-screen Service Menu.
# Use the Cursor or key to adjust the data. The or key will increase or decrease the data sequentially.
Exit from the Service Menu:
# Press the MENU key to turn off the Service Menu display.
POWER FAILURE CIRCUIT
CPU (IC800) is programmed so the set will go to
standby mode when there is circuit failure.This unit is equipped with a Power
Failure Detector function included in the CPU which checks for an abnormal
condition in the chassis power supplies. If, while the power is on, a failure
is caused by any of the following that results in a low voltage supply, the CPU
will turn the unit off in 1.5 seconds to prevent further damage:
# Failure within the power supply circuits.
# A short circuit in the load side from the supply.
Power Failure: Detected voltage failure for circuit. (Connected to IC800 pin 48 and pin 23.) (Normal: High; Failure: Low) If, while the power is off, the power is switched on and any of these failures remains uncorrected, the CPU will shut off the power within three seconds.
# Failure within the power supply circuits.
# A short circuit in the load side from the supply.
Power Failure: Detected voltage failure for circuit. (Connected to IC800 pin 48 and pin 23.) (Normal: High; Failure: Low) If, while the power is off, the power is switched on and any of these failures remains uncorrected, the CPU will shut off the power within three seconds.
Check the following if the unit is
turned off by the power failure detector.
1. Disconnect the AC power cord (120V AC line) for a short time.
2. Connect a DC Voltmeter to the circuits shown below.
3. Press the Power key and check for the proper voltage supplies.
4. If any of these voltages is low, the power failure detector should turn the unit off within three seconds.
5. Check all circuits shown below.
Note: If power failure is detected 3 times in 15 minutes, the set will enter the standby mode and cannot be switched On.To reset the operating programs of the CPU it is necessary to disconnect the AC cord for a short time.
1. Disconnect the AC power cord (120V AC line) for a short time.
2. Connect a DC Voltmeter to the circuits shown below.
3. Press the Power key and check for the proper voltage supplies.
4. If any of these voltages is low, the power failure detector should turn the unit off within three seconds.
5. Check all circuits shown below.
Note: If power failure is detected 3 times in 15 minutes, the set will enter the standby mode and cannot be switched On.To reset the operating programs of the CPU it is necessary to disconnect the AC cord for a short time.
POWER SUPPLY CIRCUIT
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