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(Topic ID: 255109)

Stern Ali - Test Point help (Values)

By jardine

4 years ago



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  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 4 years ago by jardine
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  • Ali Stern Electronics, 1980

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TP (resized).jpg
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#1 4 years ago
OP
 
JAZ

jardine

Pinside member

AU Mt Martha

12y 53,550 919 9 16

Can any help out with what the 5 TP's should read on the below Ali Stern board please.

Had a look at the wiki but not sure I saw it?!?!!

I'm correct in setting my DMM to Volts DC yeah? Thanks

TP (resized).jpgTP (resized).jpg
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#2 4 years ago
 
RAP

oldschoolbob

Pinside member

US Collinsville, IL

10y 111K 1,778 2

TP 4 is AC - all others are DC

Capture tp (resized).JPGCapture tp (resized).JPG
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#3 4 years ago
 
DUG

wiredoug

Pinside member

AU Melbourne

11y 79,050 2,741 18

hahaha no.... oh ok fine... yes

use the bottom leg of the big concrete block resistor for black

red goes on the test point

tp4 is AC the rest are DC

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#4 4 years ago
OP
 
JAZ

jardine

Pinside member

AU Mt Martha

12y 53,550 919 9 16

Can I ask, this board, what purpose does it serve?? Is it power?

Also, will the readings be fine by just touching the front of the points? Or do I need to actually touch the tip to the top or inside of the points please.

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#5 4 years ago
 
RAP

oldschoolbob

Pinside member

US Collinsville, IL

10y 111K 1,778 2

The big transformer behind this board takes the mains voltage and breaks it down into the various voltages. (note the label above the board). This board protects the game with the fuses and converts the AC mains voltage to DC for the various voltages with bridge rectifiers.

The front of the test points are insulated. Put your probe inside or on top.

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#6 4 years ago
OP
 
JAZ

jardine

Pinside member

AU Mt Martha

12y 53,550 919 9 16

Quoted from oldschoolbob:

The big transformer behind this board takes the mains voltage and breaks it down into the various voltages. (note the label above the board). This board protects the game with the fuses and converts the AC mains voltage to DC for the various voltages with bridge rectifiers.
The front of the test points are insulated. Put your probe inside or on top.

Perfect! Thank you!

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