Author Topic: Q*bert. A man and his grail... FINISHED !!!  (Read 271218 times)

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Re: Q*bert. A man and his grail...
« Reply #240 on: February 01, 2015, 12:21:52 PM »
I read on KLOV that it's a good idea to increase cap C25 on the main PCB from 100uF to f.i. 470uF to prevent high-score resets.

So, I dug around in my parts box and found a nice Panasonic 105degr. Low ESR cap of 470uF....

Just look at that ESR value......incredible quality !!!

So quickly replaced the 100uF with this one...

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Re: Q*bert. A man and his grail...
« Reply #241 on: February 01, 2015, 12:22:53 PM »
While I'm soldering, let's get out the brand new monitor cable and "mary" that to the harness....


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Re: Q*bert. A man and his grail...
« Reply #242 on: February 01, 2015, 12:31:35 PM »
I had another look at the aux-panel and I noticed that the coin counter is a 6V type. That is weird as the power output for it is 20V....
I guess they hacked in a new one when they converted it to SF....?

Anyway, here's another paper sticker Etienne ! ;)

(I'll provide the measures a bit later....)

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Re: Q*bert. A man and his grail...
« Reply #243 on: February 01, 2015, 12:35:25 PM »
So, I decided to hook EVERYTHING up this time. I first undid the PSU hacks and measured all the voltages again: fine.

Then hooked up the sound-board -> "Hello, I'm turned on" and beep when pressing test button -> OK

Then power down and hooked up the main board....power up -> Nothing......no "Hello, I'm turned on"......damn !

I noticed that the +5V Led was really really dim. Switched off quickly and got out the DVM and did a short power up again, +5V is WAY too low....looks like there's either a problem on the main PCB or in the +5V PSU section.....

Well, Robin skillfully repaired this PCB and the only things I've "done" to it is replace the two caps.....weird.

I'm measuring about 370 Ohms between +5V and ground......does that sound OK ?

Etienne MacGyver

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Re: Q*bert. A man and his grail...
« Reply #244 on: February 01, 2015, 01:00:17 PM »
Anyway, here's another paper sticker Etienne ! ;)
(I'll provide the measures a bit later....)

Picture saved, need to send you a replacement for the serial also, the one you have has a mistake i found out recentely...

Section from the post on KLOV in the alusticker thread i posted..

Quote
Quote from: Gonk;2983620
Got mine today, looks great!

Interesting, yours has "D. Gottlieb" above the adress, i did not see that on the example i used to repro this :rolleyes:

EDIT:

Found the source i used...

now i know why i am missing that line..



Looks like i need to revisit my file and add that line.

Also i see i left in a extra telephone number by accident.

I will check who ordered these in the last run, and in the next run i will do a reprint with the correct file and send them to people involved.

File adjusted:



[/quote]

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Re: Q*bert. A man and his grail...
« Reply #245 on: February 02, 2015, 12:48:12 PM »
AWESOME Etienne !!!!


I think I found the problem on the Power PCB, the thyristor SCR11 (a MCR68-1) seems to be bad, at least I measure almost a short both ways between the anode and gate.

Maybe I blew this up when I tried the half-wave rectification....darn...

Of course I don't have one of those thyristors....can't find them either.

I wonder if it is very critical to have exactly the same one. I can find an 8A version locally (like the MCR68) but it has a voltage rating of 600V instead of 25V....not sure if that would be a problem, I don't think so really...


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Re: Q*bert. A man and his grail...
« Reply #246 on: February 05, 2015, 05:03:29 PM »

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Re: Q*bert. A man and his grail...
« Reply #247 on: February 07, 2015, 01:15:39 PM »
Let's work on the backdoor a bit...

thinks it needs a bit of sanding and black paint :D

The material is weird, it seems like a stack of papers pressed and glued together...is that MDF ?

Once there was a Q*bert PCB set there....before the cab went through it's "dark days" as......<horror> StreetFighter......well at least that _DID_ make the cab survive :)

Luck is with me: I won't need the 4 studs for the filterboard anymore since I eliminated that and I need a couple to replace broken/bad one's on other spots :)

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Re: Q*bert. A man and his grail...
« Reply #248 on: February 07, 2015, 01:27:58 PM »
Label is still nice.....sadly when I barely touched it it broke off from the staples (ARGGHHH!)......

Etienne: 12,7 x 3,8 cm  ;D ;D ;D ;D ;D ;D

Removed the PCB board holder board (:D)....The alufoil board is meant to shield the electronics. I've seen pics that this is only half of the board and there was a part also covering over the PCBs. (great, more heat). I can see there are still staples from that alu-foil board but as on most Q*bert it's gone. I don't mind though.

« Last Edit: February 07, 2015, 03:01:55 PM by Level42 »

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Re: Q*bert. A man and his grail...
« Reply #249 on: February 07, 2015, 01:29:31 PM »
Backside of the "PCB board-board".....luckily everything is screwed with the usual hex screws so I can move the studs where I need them.

I removed all the studs first to clean up the board a bit, but I'm not going to do any hefty stuff on it....

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Re: Q*bert. A man and his grail...
« Reply #250 on: February 07, 2015, 01:31:18 PM »
Reinstalled to old glorie !

Nice to have them like this now...easier to work with too :)

It was funny that even the harness support clamps where still around the harness and in the correct spots to screw them back on :)

I think I'll add one or two supports where the filter board used to be as there is no support for the pretty thick bunch of wires there now.

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Re: Q*bert. A man and his grail...
« Reply #251 on: February 07, 2015, 01:51:42 PM »
aiii, I still need to checkl the monitor frame for you ::)

It's at my buddys storage space, I'll go and check it this week

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Re: Q*bert. A man and his grail...
« Reply #252 on: February 07, 2015, 02:46:54 PM »

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Re: Q*bert. A man and his grail...
« Reply #253 on: February 07, 2015, 03:03:07 PM »
Etienne: 12,5 x 4 cm  ;D ;D ;D ;D ;D ;D

Noted  ;)

Small correction, meusured a bit more precise this time:

12,7 x 3,8 cm

@Anu, thanks !

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Re: Q*bert. A man and his grail...
« Reply #254 on: February 07, 2015, 07:16:30 PM »
Just to be Anal, i have gained alot of experience with reproducing decals, and the correction to apply here and there, but this is photographed under a pretty nice angle.

Could you measure the distance between the left of the decal and the start of the letters ?

I assime its centered, but as you can see, when i copy the arrowed line to the other side it looks that the distance on that side is shorter.

anyway, based on the start of the decal i can figure it out, but if you can, provide me the distance please  ;)