I had a whole lot of problems with a similar Dawpol 6-player boxing machine, so here are various infos and repair logs:
Solenoid not firing:
- solenoid was mechanically dead - replaced with an AS-PL SS9018
- then replaced the big triac in the corner of the PCB (also dead) : BTA41-600BRG
- also replaced both white optocouplers to be safe : MOC3041M
Some button LEDs not working / various errors:
- Replaced some IRF7104 and IRF7103 on the PCB (small 8-pin MOSFETs) - I could see which ones were dead because there was a tiny bulge on them
- checked cable connexions on the PCB - was really a pain, but cleaning and tightening all connectors made a big difference
Number LCD display erroring / game erroring
- one player LCD display connector was not soldered at all ... (the cable socket was just pushed into the display PCB and not soldered)
Random errors / machine rebooting on punches
- the 6-wire power connector on the board wasn't making good contact - replaced with 6 wires + connector directly on the wire to avoid the power cable's weight pulling on the PCB connector
No sound
- Audio potentiometer was dead
- bad connexion on speaker connector
- speaker was also dead at some point
Hope this helps someone !
Solenoid not firing:
- solenoid was mechanically dead - replaced with an AS-PL SS9018
- then replaced the big triac in the corner of the PCB (also dead) : BTA41-600BRG
- also replaced both white optocouplers to be safe : MOC3041M
Some button LEDs not working / various errors:
- Replaced some IRF7104 and IRF7103 on the PCB (small 8-pin MOSFETs) - I could see which ones were dead because there was a tiny bulge on them
- checked cable connexions on the PCB - was really a pain, but cleaning and tightening all connectors made a big difference
Number LCD display erroring / game erroring
- one player LCD display connector was not soldered at all ... (the cable socket was just pushed into the display PCB and not soldered)
Random errors / machine rebooting on punches
- the 6-wire power connector on the board wasn't making good contact - replaced with 6 wires + connector directly on the wire to avoid the power cable's weight pulling on the PCB connector
No sound
- Audio potentiometer was dead
- bad connexion on speaker connector
- speaker was also dead at some point
Hope this helps someone !
