Seven-digit display board (A14) parts
On the bulletin's seven-digit display schematic, Z1 is a UDN6118A segment driver and Z2 a UDN6118A digit driver, each with a 0.01 uF cap (C1, C2) at its pin 10 supply; Z3 is an SN7432N OR gate making the comma. The +60 V feed has a 1 uF 100 V filter cap (C3) and a 10K 1/2 W resistor (R1). The filament pins of the tube are 1 and 37, and the board plugs in at A14P1.
Systems
Related tips
- Meter check of the UDN6118 display drivers
- Score displays are off but the status display works
- A display segment or digit is always on or always off
- The display voltages to check
- Telling a bad display driver from a bad display tube
- How the Gottlieb fluorescent displays work
- Measuring voltages on a display board
- Replacing a display glass tube
Source: Troubleshooting Gottlieb Displays (On Target technical newsletter, vol. 3 issue 7, 1982), Gottlieb "On Target"