(Topic ID: 326013)

Rottendog MPU004 transistor replace 20N10L

By AckerApple

15 days ago



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  • 7 posts
  • 4 Pinsiders participating
  • Latest reply 12 days ago by G-P-E
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#1 15 days ago

ISSUE: My Phantom of the Opera left sling switch does not appear working and the coil does not fire

SYMPTOM 1: Left sling coil appears burnt out and warped where arm won't move
SYMPTOM 2: A leaf switch on the left sling was stuck on outside of rubber
SYMPTOM 3: The transistor at CN19 position 6 Q10 has discoloration burn marks and appears to be burnt out

I replaced the coil and fixed the leaf switch position. ❌ I cannot solve for the blown transistor.

TRANSISTOR INFORMATION
- On diagram, CN19 position 6 Q10 transistor, appears to be a 20N10L
- On the transistor label, it appears to actually be a 1L32AC FQP 13N10L
- Transistor testing a good one it says: BJT-NPN 123=ECB hFE=43 Vf=1.73V

TRANSISTOR REPLACEMENT ATTEMPTS
- Closest match appears to be NPN TIP102 TO-220 which transistor tests as BJT-NPN 123=BCE hFE=45 Vf=1.27V
- Issue here appears to be we want "ECB" and not "BCE" <== WHAT IF I PUT IF IN BACKWARDS

LINKS:

- Rottendog MPU004 Schematics: https://ia803007.us.archive.org/5/items/RottendogAmusementsMPU004Schematics/MPU004.pdf
- NPN TIP102 TO-220 on Amazon: amazon.com link »

ATTACHMENTS:
- Quick reference to schematic MPU004 - CN19
- Transistor tester results
- Hardward photos
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#2 15 days ago

If I put the transistor backwards in my transistor tester, I get the correct "ECB". Hmmmmmmmmm

When I did the sibling test, I ran wires to do the test and so I can't tell in this moment if my own testing was in a reverse direction. I made sure the order was correct of the wires but no way to tell up versus down.

The TIP102 transistor as indents on the side where as the originals do not.

I suppose one thing I could do is re-transistor test with wires and ensure i understand the orientation AND THEN if backwards appears to be the way to go then I may try it.

If I confirm I did have the correct orientation, I won't bother to try again because it didn't work in correct orientation and the issue is most likely the original hFE=43 versus hFE=45 is incompatible and/or the original Vf1.73V versus Vf1.27V is incompatible

#3 15 days ago

TIP102 is not a substitute for a MOSFET. Use IRL540.

#4 13 days ago

✅ SOLVED. So IRL540 does work even though a transistor test registers it as a totally different transistor from what is there.

ALSO =======> I didn’t look hard enough for fuse panels, when machine was still not working I looked harder and sure enough a fuse panel with a blown fuse was tucked away into top right of pinhead.

#5 13 days ago

Glad you've got this figured out!

Yes, IR-L-540 is what I use to replace all the 13n10l, or the 20n10l. Fun fact, the 13n10l is rated for 13 amps, the 20n10l is rated for 20 amps. The IRL540 is rated for 28 amps!

The big thing to remember is that IR-L-540 is not the same as IR-F-540. IRF540 will seem to work, but will be very intermittent in a pinball, and can cause you to pull your hair out trying to figure out why things aren't working.

Almost all of my flipper problems on this board are caused by someone using some kind of substitute transistor instead of an IRL540 for a flipper driver. NTE replacements don't work, but the IRL540 does.

Mosfets are tricky to test outside a circuit. They 'charge a gate', and can hold a charge which makes them test shorted with a standard transistor tester or a meter. (The meter voltage can charge the gate!).

Test these pieces by substitution. When in doubt I pull the knocker coil transistor, and put it where the suspect transistor is. I can always replace the knocker transistor later.

Good job getting this fixed!

#6 13 days ago

For good record keeping, I am attaching what the transistor test for IRL540 came up as

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#7 12 days ago

Much better.
That transistor shows a threshold voltage of 1.8 -- so you do have the proper IRL version (valid range is 1 to 2 volts).
To be compatible with logic on that board, the threshold voltage MUST be below 2.4V.
If it was an IRF version, you would see a threshold voltage anywhere between 2 and 4 volts. Might be in the 2V range and work but if the temperature changes, the threshold voltage can increase above 2.4 and suddenly no longer work.

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