Specifications

70
Preliminary Information 42PQ30
Using the “Diode Test” on the DVM, check
the pins for shorts or abnormal loads.
Y Drive BUFFER Troubleshooting
Y Drive BUFFER Troubleshooting
RED LEAD ON
BUFFER IC FGnd
BLACK LEAD ON “ANY”
OUTPUT LUG.
READING 0.78 V
BLACK LEAD ON
BUFFER IC FGnd
RED LEAD ON “ANY”
OUTPUT LUG.
READING “OPEN”
YOU CAN CHECK ALL 8 BUFFER ICs USING THIS PROCEDURE
YOU CAN CHECK ALL 8 BUFFER ICs USING THIS PROCEDURE
• Any of these output lugs can be tested.
• Look for shorts indicating a defective Buffer IC
Indicated by white outline
Indicated by white outline
+
-
+
-
128 Output Pins per/buffer
6 Ribbon cables (Horizontal Grids)
768 Total Horizontal Grids controlling Vertical resolution
BUFFER IC FLOATING GROUND (FGnd)
BACK SIDE OF Y-DRIVE PWB
128 Output Pins
43 43 42