Our junk yards clock has never worked. It's very slow and loses multiple minutes every real minute.
It doesn't matter if the game is on, or off, it loses time.It's frustrating as this is a game that benefits from a real time clock, in attract it has a cuckoo clock every hour, as well as midnight madness mode.
It's sitting next to Congo which also has a midnight madness, so we were imagining both playing each game at the same time and midnight madness going off at the same time... It's unique and fun! (Congo has no issues with keeping time at all)

Ive checked and changed the batteries, including installing a battery pack off the board. Near the batteries the schematic shows a crystal oscillator but it was missing on our game with no sign there was ever one installed, so I bought one and added it in... No change at all.

I notice there's another, much bigger crystal oscillator lower down on the board.
I've ordered a replacement incase it's worth swapping.

What is the difference between the two oscillators? Why was one missing and does it not have any use?

What else can I try?

Pic of the location of the second bigger oscillator.
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I installed a crystal go that spec into X1, it had no impact. The mystery to me is why the board came without one installed. Did Williams forget?

So X2 does have an impact on the real time clock and is worth swapping to a new one? I was worrying it had a different purpose.
I thought the battery circuit with X1 did the clock, especially when the machine is off, but it loses minutes when the machine is off .. would x2 have any impact on this?

There was no solder or any evidence of there ever being a crystal there, the pads looked fresh from factory . It's bizzare.

I've got a DMM , not sure if it has that setting, I'll take a look but I doubt it as it's a cheap one.
I replaced those caps recently too, I did the 3 caps and oscillator that are on the battery circuit schematic.

It's losing minutes at a time, all my other games are pretty solid. Congo is on the dot, as is Road show, the rest I don't bother with the real time clock as he doesn't effect the games.

Junk Yard loses time when it's turned on, and quickly. About same as when it's off.

I don't mind minutes creeping over a month or so but JY loses time within 5mins real time.

All of that schematic except the x1 crystall was present.

I've ordered a new multimeter with HZ setting as I was due a new one anyhow.

I compared the voltage from batteries with Congo and JYs batteries are providing a stronger voltage than congos so it can't be them. Unless I can check the voltage closer to the crystal to see if it's losing voltage on its journey to the crystal? Any suggestions of a place to test?

I was also under the impression if the crystal doesn't exist or isn't working at all the time wouldn't progress at all? Or does it use something else?

I have a multimeter that measures HZ now, I measured across the bottom legs of c29 and c39 and get 32ish...
On junk yard i get 0.
It's a new crystall, and I have another spare if needed.
Could it not be getting power? Where would I test this?

So what next?

I only have two other wpc95 games, AFM and Congo. I'd rather just solve the issue!

I bought these ones. I had the option of the tall cylindrical ones but for some reason picked these. I am not sure if they're different?
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The caps were changed and I made a mess of it. But we still have continuity, I'd be worried about swapping them again unless they're definitely an issue.

I probed 4584 and compared to congos. Pin 12 probes high and low on both games but pin 13 shows nothing on JY.

Should have clarified pin 13 of 4584 on Congo was showing some behaviour with the logic probe(I forget which) but the same pin on JY is dead.
Does this indicate it's 4584? Or could it be caused further back?

I'm quite the intermediate with the electronics side of pinball, I understand bits and pieces only through trial and error or someone helping me.
This is first time I've had a DMM with Hz setting, can I probe with just one lead, if not where do I put the other?

Can you explain like I'm 5 what pin 12 should be doing?
I assumed the crystal is powered and sends a frequency to it, or is it more than that?

I had already replaced the caps in the battery circuit and made a mess of it. So to save me messing around I sent it to someone, he fixed a broken trace on the caps and replaced the crystal, I think the one I put in wasn't working right, even though the they claim to be the correct hz.

It keeps time now... except when it's off. It doesn't progress time at all.
As far as I know he just fixed the broken trace across the bottoms of C29 and R92 and put in a new crystal.

Before it was consistent in keeping bad time when on or off.
I've messaged the person who fixed it but if it's something simple I can probably fix it, especially as it was keeping (bad) time when off before.

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All good! D2 had failed.

Working perfectly now