Checking the +60 V filter caps on a display board

Steps

• Power off and unplug the display.
• Put the red (positive) lead on the capacitor negative and black on positive: about 25K to 30K ohms.
• Reverse the leads: open.
• Compare with a good display if readings look odd.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• The display voltages to check
• How the Gottlieb fluorescent displays work
• Measuring voltages on a display board
• Meter check of the display board 7432
• How the System 80 fluorescent displays light
• Meter checks on a display tube
• Meter check of the UDN6118 display drivers
• Use the shared wiring to locate display faults

Source: Troubleshooting Gottlieb Displays (On Target technical newsletter, vol. 3 issue 7, 1982), Gottlieb "On Target"