I'm having issues with my gun on Dirty Harry.

When I fire up the game, the gun starts to initiate, but it just continues to turn back and forth.

I checked the micro-switch under the playfield. It works fine in switch edge test.

Any ideas as to what I should look at next?

The switch registers fine in gun test mode. I only see 1 switch though.

The Motor EMI board?

http://www.marcospecialties.com/pinball-parts/A-15542

If it is the board, I think I'll get this one instead...it's a lot cheaper:

http://mad-amusements.com/product.php?id_product=1453

When I go into gun test mode, the gun is idle until I push the "+"

It continues to run until I shut it off by pressing the "-"

When I fire up the machine...there are no credit dots.

I remember it cycling once, maybe twice...bfore.

Now it continuously cycles...each time getting slower and slower...as if the motor is wearing out. I'd be afraid to let it cycle for too long...I'm sure, eventually, the motor will just stop working all together.

It won't start a game...it just says gun initializing, please wait.

I went into settings/disable gun...The game plays fine...even the gun, (even though I just set the machine to disable gun).

I'm not sure if this is related...but my slingshots aren't working either.

The slingshot switched were closed...I've adjusted them.

I have deeper problems...

Every time I turn the machine off, then back on...it goes to "factory settings installed".

None of my settings are keeping.

I'm going to take a look at the battery holder...see if maybe it's a bad solder joint. (I JUST put in new batteries).

I went ahead and replaced the battery holder...

The factory reset issue is solved.

I ordered the motor board.

Hopefully, that will solve that problem.

Before my shop job, the gun calibrated itself pretty quick...It's never take "minutes" before.

I'll replace the Q-36 soon....I have a lot of transistors lying around.

UPDATE

I changed the Q36 transistor.

Still no luck in getting this repaired.

Do you guys think I need to change the pre-driver transistor as well?

I'm still waiting on the EMI motor board I ordered from Mad.

Thanks zaza

My fear is that when I fire up the machine, the gun rotates somewhat fast...but it keeps getting slower and slower as it continues to rotate.

If I just let it continue to rotate, I'm afraid the motor will "burn up" and no longer work at all.

This gun re-calibrating can seriously take several minutes to accomplish the task of calibrating?

Well....you guys were absolutely right.

It took about 2 minutes, but the gun is calibrated now.

Guess I should've listened to you guys...(us "old-farts" can be kinda hard-headed at times).

I was just paranoid that the gun motor was going to burn up.

Thanks again guys...it looks like I'll be playing a lot more DH now.

Now I need to work on my Mousin Around issue.

The ramp ball diverter isn't working...says to check switch 49, (which I've replaced).

Switch tests OK in edge test...the ball diverter works fine in coil test.

Yep zaza...you're right.

It only rotates a couple times...and it's ready to play....(ah...just like old times).