Completed the gound mods on each board, back to the ground plate in the cabinet.
Replaced the two caps with like for like on the uF except the 25v went up to a 50v.
Works the same.
So here are my remaining issues.
I bought a super cap from Amazon for the 5105. Went to install it. According to documentation the arrow points to the negative. Soldered it on to the MPU. Before putting it back in I decided to double check to make sure the polarity was correct. Set the MM to Ohms, red to + black to -..... nothing. Switched it started climbing.... tested voltage red to + black to -... got a negative voltage reading. Removed it and not sure if it's me or the cap.
amazon.com link »
Many of the lamps and in particular the 24v 313s dim ever so slightly when the flippers are engaged, probably unnoticeable to just about everyone.... but me. Correct me if I am wrong but neither one of those filter caps I just replaced would have anything to do with that correct? Another person who played it a couple of days ago mentioned the dimming when the old caps were still present but I had not noticed it until I replaced the caps. If it's not the caps what could it be? If it is the caps would a higher capacitance help? My understanding it's best to keep the capacitance as close to spec as possible but I am certainly no expert.
Lastly when I first turn it on there is a slight audible hum on one or both of the speakers that goes away after play 30 seconds. Anything to be concerned about or just ignore it?
Other than these issues she runs like a champ. I am considering doing the mod to the 313s to make them 44s but I am searching for pics and unable to find them.
Also I find the background music annoying and was hoping there was a way to turn the background music down whilst keeping the play sounds higher. I noticed the two potentiometers on the sound board and figured one was for play sounds and the other for background..... nope. R15 controls both play and background sounds. I am aware of the main volume potentiometer in the cabinet but was hoping R16 was for background. It must be for speech which HH does not have. I just flipped the dip to turn the background music off. Anyone know of a way to accomplish this?
Oh yeah please ignore my crappy soldering. LOL
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