MCR Power Supply (Satan's Hollow)

scottmaggie

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Ok so with all the SH posts last few days and the fact I finally got the Speedway EM out of my way I am starting to tackle my Satan's Hollow.

I am getting odd voltages on J5:

Pin 1 is +10.27 (should be +5)
Pin 13 is +15.50 (should be +12)
Pin 14 is +10.51 (should be +12)

Any suggestions?
 
Some pix to help...

Here is the pinout and an image of the MCR board with test point and my results...


By the way - even though they are diff revisions will an Omega Race MCR work in a Satan's Hollow? I know my OR PS is good...
 

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Here is the pinout and an image of the MCR board with test point and my results...


By the way - even though they are diff revisions will an Omega Race MCR work in a Satan's Hollow? I know my OR PS is good...

I don't think it's the same board. If you have a tron or wacko or kozmik krooz'r or spy hunter, or discs of tron, those would work.
 
Ok so with all the SH posts last few days and the fact I finally got the Speedway EM out of my way I am starting to tackle my Satan's Hollow.

I am getting odd voltages on J5:

Pin 1 is +10.27 (should be +5)
Pin 13 is +15.50 (should be +12)
Pin 14 is +10.51 (should be +12)

Any suggestions?

Check R113.
 
I am getting odd voltages on J5:

Pin 1 is +10.27 (should be +5)
Pin 13 is +15.50 (should be +12)
Pin 14 is +10.51 (should be +12)

Any suggestions?
Re-check your understanding of the pins against the schematic. The ones you called out are not described accurately in that table that you linked....

J5-1: Unregulated power for coin counter
J5-13: Unregulated +12VDC for sound (hardly matters, right now!)
J5-14: Unregulated +12VDC for lamps (hardly matters, at all!)

But the logic supplies like +5 (J5-2, J5-4) and +12 (J5-9) look perfectly fine to me in what you measured. Actually values you measured seem fine to me, as described in the schematic.
 
sh supply

So you think the supply is actually good then? I'm confused. That chart came from a website with the mcr pinout. I just noted where my readings differed.

Also ill go check r113 per the previous post.

Chances are my boards need repair but first I want know know the mcr ps is good. I'll be testing my boards in a few days in a known good SH.
 
If your boards need repair, shoot cdjump a pm. I have had at least 5 sets and possibly 10 repaired by him, and they were/are all flawless. I love that guy!

I always pay the extra $15-$20 for the new ribbon cables as well. He installs them. That right there saves a guy 2 hours and a huge headache. :)
 
So you think the supply is actually good then? I'm confused. That chart came from a website with the mcr pinout. I just noted where my readings differed.
Yes the items I spot-checked looked ok. The info you got from the website is bogus/incomplete. Check the schematic (link) for accurate info. Power supply is the final page of that PDF. You need to test under load, meaning with the board connected, to be certain. If the voltages still look good then you likely have a board issue.
 
Satan's Hollow MCR powers supply.

Ok so I still have to go recheck everything per last nights comments but I did find my pinout chart was incorrect. I now thing my PS is good but will triple check.

Attached are screen captures right from the Satan's Hollow schematic and a breakout I typed up.


POWER SUPPLY IN FORM CHASSIS
J6
1.
2. COM
3. 12V

J3
1.
2. 8V COM
3. 8V COM
4. 8V UNREG
5. 12V COM
6. 15V UNREG
7. 5V COM
8. 8V UNREG
9. 12V COM

POWER SUPPLY OUT TO BOARDS
J4
1. V. BATT
2.
3. +5
4. A GND
5. +5
6. +5
7.
8. LOGIC GND
9. LOGIC GND
10. LOGIC GND
11.
12. +12
13.
14.
15. RESET

J5
1. UNREG +5 (coin meter)
2. +5
3.
4.
5. LOGIC GND
6.
7.
8.
9.
10. Coin meter return
11. (Coin Door & Display lights return)
12.
13. +12 (audio)
14. +12 (coin door & display lights)
15. Audio Return
 

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Satan's Hollow power supply update...

R113 on the PS was fine. I replaced it anyway.

Retesting the power supply I got the same results. All are fine except:
J5
1. UNREG +5 (coin meter) is around +10.50
13. +12 (audio) is around +15
14. +12 (coin door & display lights) is at +10.50

Per recommendations here I hooked up the boards and tested the supply again. With the boards hooked up everything remains the same BUT all +5 on both J4 & J5 drop to around +2.75.

So I guess it's the boards. That said any suggestions on where to start? I'd like to poke around before sending it out for repair...
 
Retesting the power supply I got the same results. All are fine except:
You might drop the "except". Those are unregulated power supplies for coin counters, coin door lights, and the audio amplifier. Unregulated meaning it's coming off the power brick for high power-draw but non-critical circuits. It can be a distraction to worry about the exact voltage here, unless you're diagnosing a problem on these circuits, because the voltage will vary. Coin door lamps light in the ballpark of 12v so they didn't waste hardware to generate a tight tolerance +12.000v.

Also note they're separate and different from the regulated +5v and +12v logic supplies; that's why I said that table was somewhat misleading. For example power on P5-14 for the coindoor lights is hardly related to power for the PCB. And the schematic page I referenced is suitably vague, calling J5-1 "around 8v".

Per recommendations here I hooked up the boards and tested the supply again. With the boards hooked up everything remains the same BUT all +5 on both J4 & J5 drop to around +2.75.
So I guess it's the boards. That said any suggestions on where to start? I'd like to poke around before sending it out for repair...
Ok, that's more of a problem if you get bad power out to the board. Check the schematic, best place to measure +5 is across C106 since it has huge metal legs. Same for +12 across C102. I suggest you remeasure this way so I can be certain you're probing with a good ground. If you're still seeing +2.75 on the +5v and nothing on the PCB is smoking or on-fire, then you have a power supply issue to resolve. Often I start with a Bally MCR rebuild kit then start worrying about individual components.

Also, you know there's an adapter available to run MCR games off a switching power supply? Even if you intend to fix the original power supply it can be nice to have that adapter on-hand for testing around a known-good new switching power supply.
 
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Sh ps

joeyoravec -

I tested yet again and same results:

+5 at C106 & +12 at C102 tested fine until the boards are attached and then
+5 at C106 drops to +2.7. The +12 at C102 remains fine.

So you think it is still a power supply issue and not the boards? My thinking was that if the supply reads fine but drops when the boards are attached that the boards are at fault.

I know about the bob roberts mcr kit and about wizzes mcr to switcher adapter. I just wanted to try to narrow down the issue to either the power supply or the boards.

Also a member here has graciously offered to let me test the boards in their cab...
 
My thinking was that if the supply reads fine but drops when the boards are attached that the boards are at fault.
Unlikely. Anything possible, but a board would usually have a dead short and would blow a fuse or start smoking. That isn't the case here. You more likely have a power supply that isn't regulating +5v properly because it has some bad parts on it.

You'll just have to decide if you want to rebuild the original design (Bob's 90412 kit $24, cap $20, cap $15) or change to a switcher (adapter $45, PS $25). My preference is to usually to fix the original supply.
 
Thanks!

Thanks for all the help. At this point I am going to go test the boards and then decide on which way to go with the power supply. (who are we kidding I will keep messing with the supply too!).

I will keep you posted & thanks again!
 
You've isolated the issue to the 5VDC line. There's only a handful of components that could fail under load......likeliest suspects.....Q103, Q105, U2, Q104 (in that order).

Edward
 
SH PS update

ELutz:

I tested Q103, Q105, U2, Q104 in order per your instructions and guess what...

Q103 came up no good! I pulled it and tested again and it is definitely no good. I went on to test the rest which are all good though I can't (don't know how to) test U2.

I am going to order a 2N5301 or per Bob Roberts 2N3772.

Thanks again for all the help. I will update again when the part is in. (sure hope the boards don't also need work!)
 
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MCR ATX ps

I've got a brand new MCR ATX adapter and ATX power supply available if you want the game to work while your fix'n the original :)
 
ELutz is my new best friend - Satan's Hollow Lives!

Per ELutz help as seen in this thread. Popped in a new Q103 transistor today and...

SATAN'S HOLLOW LIVES!

It's got some typical MCR hum sounds but other then that working 100% WOO HOO!

Thank you ELutz!
(Kudos to joeyoravec for your help too!)


PS: I will put new caps on the MCR and 2 new bigs in the chassis - that should clear up the hum right?
 

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