Main Board # 1		Status upon arrival:  DOA.  Repairs:  The board had multiple RAM/ROM failures so a good cleaning was in order.  Back of PCB flux cleaned.  Edge connector repaired.  Header pins cleaned and reflowed.  Replaced and socketed the failed 2114 RAM at locations D1 and D2.  The first signs of life were collapsed vectors in test mode.  The DAC at location D9 was socketed and replaced.  Test mode still showed many random vectors but on the oscilloscope display they were no longer collapsed.  Replaced the sockets at vector ROM A3 and B/C3.  ROM E1 was showing no signs of life so a new 2716 was burned.  A 74LS74 at location M9 was replaced due to faulty logic.  After all these repairs I was able to get a decent looking test screen on the oscilloscope but had an intermittent L and T error.  I made a new interconnect cable between the main PCB and the AUX PCB.  This solved the L and T error and the test screen was now perfect. perfeperfect.                                                                                                                                                                                                                                                  Board now works!
Main Board # 2		Status upon arrival:  DOA. D Repairs:  This board had many poor repairs done over the years with solder pads and traces destroyed.  A significant amount of time was spent repairing all the traces and solder pads.  Header pins were cleaned and reflowed.  A new interconnect harness was made.  All sockets were meticulously cleaned.  The +15vdc regulator at VR3 was dead and then replaced.  The DAC’s had previously been socketed and were a mess.  New sockets were installed at A9 and D9.  This corrected vector collapse and random vectors showing on the screen.  Board now works 100%.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Board now works!
Main Board # 3		Status upon arrival:  DOA. Repairs:  Currently under repair.  Failed ROM at L/M1.  Failed PROM at K7.  Missing crystal at Y2 – replaced.  All chips and sockets cleaned.  All header pins cleaned and reflowed.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       .
Aux Board # 1		Status upon arrival:  DOA.D Repairs:  Cleaned and reflowed all the connections for the interconnect cable.  Replaced the 5vdc LED as it was no longer working.  There was zero sound with this board and a faulty LM324 at K5 was socketed and replaced.  During game play the tanks, obstacles and the ‘Battlezone’ crawl were missing.  A faulty 2901 bit slicer was the cause at D/E2.  Replaced. Board now works!
Aux Board # 2		Status upon arrival:  DOA. Repairs:   The AUX board was working after the header pins were cleaned and reflowed.  An extremely loud tank engine noise was present that drowned out all of the other game sounds.  This was corrected by replacing a faulty capacitor at C29.  A new interconnect cable was made. Board now works 100%.                                                                                                                             Board now works!