Lexicon RV-8 Service Manual page 21

Lexicon
Power On – Complete Supply Test
This test will verify that there are no shorts from the transformer secondary winding to ground.
WARNING
Lethal voltage will be present during this test. DO NOT come into contact with the
Amplifier Output Transistors or the Heat Sinks. Power Supply Discharge time is more
than ten minutes unless discharged using a discharge box.
Setup:
1. Set the rear panel power switch of the RV-8 to the "0" (OFF) position.
2. Connect one end of the AC power cord to the RV-8 and the other end to the Variac.
3. Power on the Variac.
4. Set the Variac voltage to 120VAC. Test.
Test:
1. Set the rear panel power switch of the RV-8 to the "1" (ON) position.
2. While monitoring the current draw on the Variac, after approximately sixty seconds, verify that the
current draw is less than 1.0A (0.85A typical) and all seven amplifier channel LEDs are lit.
Brown-Out Test
This test verifies that the unit responds to a brown-out (reduction in AC Line Voltage).
Setup:
1. The RV-8 should be powered-on normally through the Variac.
2. Wait for the RV-8 to complete its power-up initialization.
3. Verify that all seven of the Amp Status LEDs at the bottom of the front panel are lit.
Test:
1. Slowly turn the Variac voltage down until the RV-8 display indicates:
"****BROWN OUT !! ****
****CYCLE POWER ****"
2. Verify that all seven of the Amp Status LEDs at the bottom of the front panel are OFF.
3. Set the Digital Multi-Meter (DMM) to measure AC Volts reading on the highest range.
4. Disconnect the AC Line cord from the rear of the RV-8.
5. Verify the voltage at the AC Line cord is between 80 and 90 VAC.
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