continue thread from vid1900 bulletproof, ” from post#1026
put the wrong resistors in and displays are dead.
(Topic ID: 321936)
Linked Games
World Cup
Williams, 1978
Topic Gallery
You're currently viewing posts by Pinsider Magadovski.
Click here to go back to viewing the entire thread.
Zero volt on all 4 all sides,
z2-z4 looks like one side each got black legs.
R1-R4. Are the old fireprof 39k that worked before i started.
Checked all fuses again and they are fine.
Quoted from Schwaggs:Measure the voltage on either side of the resistors you replaced. One side should measure 0 volts, the other should be near + or - 100V
Then measure on either side of Z2 and Z4. Same deal, one side should be 0V the other + or - 100V
This should tell us where the voltage regulator stops working.
4B24372E-B582-46F9-A351-1BB8C90E79FF (resized).jpegTook another multimeter this time i got 128 v +-on r1-4
Zero on both side z4
Acts weird on z2 ”jumping”
Around 128v + - on z1 z3
By the way checked my order and my suplier said in the mail, 39 kohm 2w
Did they send me wrong?
Quoted from Schwaggs:Are you sure there is zero on both sides of the resistor?
For grins, measure on both sides of Z1 and Z3 (the grey diodes just below the resistors you replaced).
Ok should it not be voltage z1 & 3?
I have ordered parts for z1 & 3 now, but delivery comes end of november.
Hopefully i can get diod for z2 & z4 earlier.
If i change parts and get volt on j5 should i be back on the road again?
Thanks you for your help!
Quoted from Schwaggs:Seems you probably blew Z1 and Z3 with the 39 owm resistors. So you should replace those.
However, its hard to tell if Z2 and Z4 and Q1-4 were damaged.
If I were you, I would order all those components unless you have the Zeners on hand to try first.
The power transistors are no longer made but GPE put together this helpful guide back when he was still selling parts. https://www.greatplainselectronics.com/Downloads/W3-11_HV_Kit.pdf
Quoted from PINTEC:Check these caps that they are not shorted.
[quoted image]
Thanks i will check does to!
Quoted from PINTEC:Check these caps that they are not shorted.
[quoted image]
They are not shorted but they have low resistanse compare to others on the board, those two have 0.330
The others on the board have 1.743 nd 1.073
2 weeks later
I have change z1 -z3 & z2-z4
And i got voltage on j5 now.
Display 1 & 2 still black but 3-4 works now.
Quoted from Schwaggs:Seems you probably blew Z1 and Z3 with the 39 owm resistors. So you should replace those.
However, its hard to tell if Z2 and Z4 and Q1-4 were also damaged.
If I were you, I would order all those components unless you have the Zeners on hand to try first.
The power transistors are no longer made but GPE put together this helpful guide back when he was still selling parts. https://www.greatplainselectronics.com/Downloads/W3-11_HV_Kit.pdf
Pin 3 & 4 j5 90 - 91 voltage
Masterdisplay only 1 digit shows.
Quoted from Schwaggs:Progress!
You should measure the HV power supply voltages to be sure they are in spec.
Is the display on the master display board working?
Try swapping the cable on one of the working displays with one on the non working.
8FAE7424-07FE-42F3-B35F-D19C12FFFF46 (resized).jpegChecked that no short but cleaned it,
Quoted from Rikoshay:it may be nothing but pin 1 appears to have a solder splash? short to the blank solder pad above, and where legs 1 & 2 come out from the IC it looks to have a fine wire? right next to/touching pin 1 then going to solder pad 2.
maybe use your meter and check for any possible shorts from pin to pin?
Quoted from Schwaggs:Do you have a logic probe? Can you see if you see pulsing on IC8 Pins 2, 3, 4, 5 and 9-15?
Yes i have one, but not sure how to connect it. can i connect it to the 5v lamps on the backbox? Which settings should i use?
I have now going throu the board again.
The z3 & q3 were shorted.
I also swapped q4 and a new r4 & z4 just to be sure.
Now i got -90v.
Anything more i i should check before i connect powersupply to boards.
I got a feeling something along shorts the powersupply, masterdisplay?
I have +90v & -90v on pin 3,4
And 4,8v on pin 6
I use 250mA sb fuse
Quoted from Schwaggs:Is the other voltage +90v? You should have one at +90 and the other at -90.
It is possible the display glass on the master display is causing troubles. I would think that if it was shorted, the fuse would blow. Are you using the proper size fuse on the high voltage?
Quoted from Schwaggs:I’d be careful with any overseas suppliers, they may be fake. They look like the right parts but who knows. Did you test the inputs and outputs of the existing bcd decoder to confirm they are bad?
Where did you get the replacement 7180? It’s also possible it’s a fake.
Yes i was not sure which side where which.
But i compared those two and ic8 did not have pulse on one side like the ic5
I got 7180 from a swedish pinball parts supplier, www.free-play.se
They did not have ic5,8 chip
2 weeks later
Promoted items from Pinside Marketplace and Pinside Shops!
You're currently viewing posts by Pinsider Magadovski.
Click here to go back to viewing the entire thread.
Reply
Wanna join the discussion? Please sign in to reply to this topic.
Hey there! Welcome to Pinside!
Donate to PinsideGreat to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
