Dig Dug Revisited (Upright)

wxforecaster

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Let's keep the Dig Dug theme going here.

While I await the cap kit, HOT, etc...from Bob to continue work on Dig Dug I (cocktail), I figured I'd begin troubleshooting Dig Dug II (upright) that I acquired for a little more than a Benjamin the other day.

The Power Brick all tested good:
1,2,3 -> 4,5 all tested between 10.6 and 11.7V DC

6-7 38 VAC
8-9 6.8 VAC
10-12 64 VAC
13-15 64 VAC

The AR II board also tested good:

10.3 un reg was ~11.5 VDC
+SENSE was spot on at 5.00 VDC

When I connect the PCB:
The 10.3 unreg drops to 9.4 VDC
The +SENSE drops to 4.3 VDC

What I know:
- Coin door and cone start buttons light
- Hitting a credit does nothing
- Board LED is lit
- Speakers produce an audible hum (almost like a 60 Hz hum)
- Monitor has neck glow. B+ is dialed in at 120V. After a minute or two of warmup, I get a faint white glow on the monitor. I must admit, it has severe burn in and probably should be sent curbside if I can save the chassis/neckboard.

Much like cocktail DD, I think this one may have both PCB and monitor issues. Anyone in the Kansas City area have some free time before turkey day and a working monitor? :)

Now that I've typed this, I'm not even sure why, other than as a place holder for a repair log :( Any words of wisdom would be great.

Evan
 
The white glow indicates that the monitor works enough to give you a pic. Throw the board out of the CT into it and see what you get on screen.
 
Dokert,

I'm trying to keep the cocktail and upright threads as separate as possible.

Here's what we know about the upright...
I had to turn the garage pitch black to get this picture with a 2 second exposure (i.e. it's not only messed up, but extremely dim). and this is with the brightness turned up.

The screen appears to be the board constantly resetting. All I get is a hum through the speakers, with nothing in test mode (it's not even getting that far). Given the low voltages measured on the ARII board with the PCB connected, I think there are voltage regulator problems on the ARII board itself -- because as you'll see, I put the PCB into the cocktail (now with working monitor) and it booted right up no problem.

So, let's take a look at these separately. First the monitor.
Clearly the horitzontal width coil looks like a slinky and needs to be replaced (see below). However, it does have a new flyback and many of the caps look new. I need to test them, but this monitor definitely isn't right, and I'm thinking a number of the caps may be either original or shot. It takes nearly a minute for the monitor to reach full brightness, which is about 20% of what it should be. Also, there's no shield covering the lower-mid section of the chassis board, which you see on the G07s. Is this required and where can I get one?

(Yes the camera is in focus)
digdug_ur_monitor.jpg


digdug_ur_chassis.jpg


As for the game, it seems to be constantly rebooting, which makes sense because the ARII +SENSE drops from +5VDC to 4.5 when you plug in the PCB. However, the PCB boots up in the cocktail (see next post). The constant 60 Hz hum coming through the speakers would also suggest the ARII board is not behaving normally, although all the caps do test good with an ESR meter. Going to use the working ARII from the cocktail to troubleshoot. Wondering if it's the VRs next to the heat sink perhaps??

Now, with respect to the PCB itself, there are some concerns I have. There are two caps that are soldered to chips on the leg, and then one wire connecting to other glass caps. Why is this done and can I repair it? The board is in almost mint condition otherwise.

digdug_board_1.jpg


digdug_board_2.jpg


digdug_board_3.jpg


(continued below...)
 
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Now, when I put this same PCB in my now working cocktail, I get the following on the test screen:

digdug_test_1.jpg



When I press the test switch once, I get a bunch of 9999's at the bottom

digdug_test_2.jpg



When I switch to play mode, the game boots but then gets stuck here. What's odd is the online manual reference dip switches at 2C/D, but both my Rev B boards have the two 8-dip switches in row 9. I'm wondering if I've got the dips wrong somehow? It's just frozen like this.

digdug_game_1.jpg
 
There was more than one version of the Dig Dug PCB and they are laid out completely differently. If the manual does not match your board, you need to find the correct version of the manual.
 
Indeed you were correct. Found the Rev 2 dips here:
http://www.solvalou.com/subpage/arcade_dips/D/digdug/dips.txt
The freeze (obviously) was on, along with a bunch of other settings incorrect.

Dig Dug #1 (the cocktail) lives and breathes perfectly!! Thanks for all your guys' help.

Still curious as to those board hacks and whether they should be left there or restored to original.

I think I figured out why the upright monitor is not functioning. I turned over the chassis and was correct that a cap kit had been done. Many test old/dry so will have to do one again. More importantly there are several "hacks" done to the back of the chassis. Will take that to the monitor forum as I now begin work on the upright and its now inherited board issues as well.

Evan
 
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