LG 50PG20 Training Manual page 77

Y Drive BUFFER Troubleshooting
Y Drive BUFFER Troubleshooting
YOU CAN CHECK ALL 8 BUFFER ICs USING THIS PROCEDURE (4 per/PWB)
YOU CAN CHECK ALL 8 BUFFER ICs USING THIS PROCEDURE (4 per/PWB)
BACK SIDE OF Y-DRIVE PWB
OUTPUT LUGS
Buffer IC
• Any of these output lugs can be tested.
• Look for shorts indicating a defective Buffer IC
Using the "Diode Test" on the DVM, check
the pins for shorts or abnormal loads.
RED LEAD ON
BUFFER IC
Indicated by Red outline
BLACK LEAD ON
BUFFER IC
Indicated by Red outline
77
BLACK LEAD ON "ANY"
OUTPUT LUG.
READING 0.73 V
RED LEAD ON "ANY"
OUTPUT LUG.
READING "OPEN"
Plasma Spring 2009 50PG20