The F2 display fuse on the TA-100 power supply board blows the instant the game is switched on, even with only J2 connected.

Display fuse blows at power-up on the TA-100 power supply: shorted bridge diode

Cause: One of the four diodes (CR1 to CR4) forming the high-voltage bridge had shorted; CR4 read zero in diode test.

Checks

• With power off, test CR1 to CR4 in diode mode and compare the readings.

Fix

• Replace the shorted diode; a 1N4007 can stand in for the original 1N4004, and only the bad one needs replacing.

This is the high-voltage display supply. Work on it with the game unplugged and let it discharge.

Systems

• Stern MPU-200

Games

• Meteor

Related tips

• F2 blown, no display high voltage at TP2
• Display glass dim, digits missing or slow to light
• Capacitor C26 holds the display high voltage after power-off
• A display not working from MPU or sound board faults
• Switch reads closed even with switch connectors unplugged: shorted resistor on the MPU

Source: Pinball Repair help group!! (Facebook group)