Metalman1661 Posted October 24, 2014 Share Posted October 24, 2014 I recently purchased a non-working asteroids unit (serial # 28,XXX) from craigslist. Below is a brief detail of the unit:-Asteroids Rev -04 board-Monitor is a G05-802-A/R I board As you can see in the attached pictures, there is a weird ripple in the test pattern and it is noticeable when playing as well. Also here are the 0-scope shots: http://imgur.com/a/15LpC ... The Y signal has an odd spot that doesn't match the manual (circled in red) I have replaced/checked the following so far:-Checked all fuses in unit, all are good.-Checked voltages from Power Brick. All checked good.-Checked unregulated input (~ 10-13 volts) and regulated 5V output (~5.10 V) on A/R I board.-Replaced caps on HV unit, Deflection Board, Main PCB, A/R I, Big Blue-Checked all diodes and transistors on Deflection and HV boards, all test good.-Checked bottle cap transistors mounted to chassis. All check good. Made sure all were NOT shorted to case.-Quickly checked all connectors and all seem to visually look intact. Re-flowed solder to all connectors on Deflection and HV board.-Replaced R100 and R101 on deflection board with 18 AWG wire. -Checked X and Y signal from game PWB with O-scope and the ripple is present so I believe the problem is from the PWB. Does anyone know what this ripple can be caused from on the game PWB? Quote Link to comment Share on other sites More sharing options...
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