Heat from Q1 cracks other solder joints

Q1 can run hot enough to crack solder joints on nearby parts of the power supply, so reflow suspect joints. IC1 is a UA723CL, the round metal-can version of the LM723.

Systems

• Gottlieb System 1

Related tips

• Getting to the power supply solder side
• Lockups and odd behaviour from a heat-dried C1
• System 1 power supply shows about 110 V where 4 V and 8 V belong: wrong ground
• Quick checks on the similar System 1 power supply
• Spare diodes, capacitors and other parts for System 1
• System 1 power supply outputs
• The 5/12 V supply is only half-wave rectified
• All coils and most CPU lamps lock on at power-up

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)