(Topic ID: 320988)

Haunted House System 80 MPU boot issue

By stvns78

1 year ago


Topic Heartbeat

Topic Stats

  • 16 posts
  • 5 Pinsiders participating
  • Latest reply 1 year ago by stvns78
  • No one calls this topic a favorite

You

Linked Games

Topic Gallery

View topic image gallery

20220831_230705 (resized).jpg
20220831_230627 (resized).jpg
20220831_204121 (resized).jpg
IMG_2725 (resized).JPG
a4aaf3faa253044e36eabc736120c4cd33018209 (resized).jpg
Screen Shot 2022-08-24 at 8.42.09 PM (resized).png
MPU_Slam_Mod (resized).jpeg
MPU_Rear_Post_Mods2 (resized).jpeg
MPU_Reset_Post_Mod (resized).jpeg
MPU_Clock_Post_Mod (resized).jpeg
HH_T_Credit_Window (resized).jpeg

You're currently viewing posts by Pinsider g-p-e.
Click here to go back to viewing the entire thread.

#2 1 year ago

Sounds like the memory cap was probably not the problem but the act of working on board (connectors, etc) may have been the problem.

Make sure the case of the oscillator isn't touching one of the traces on the top of the board. It should be raised up a hair.
Get some alcohol and a soft bristle brush - clean up some of the flux on the top and bottom of board and then recheck solder joints.
The 100uF cap is old but not the source of your problems.

Before you do any more mods to that board - easiest to get a logic probe and go from there.
With logic probe & voltage meter, you want to divide and conquer - figure out where the problem is: power, clock or reset.

Very first thing to do is verify you have good power at the CPU board. Measure for 5V directly across that 100uF cap, C1. How close to 5V does it measure?

With logic probe, see if the clock divider is running or not. Can be checked at Z2, pin 9.
If pin 9 has no activity then the oscillator isn't running, check Z3, Pin 6.
If the clock is running then I would double check the board for the reset modifications you made.

Next with logic probe, see what your reset is at the CPU, U1 pin 40. Catching the actual reset pulse is unlikely with just a probe.

The quick tests above will tell you if it is a power problem, reset problem or clock problem.

1 week later
#11 1 year ago

Clock circuit appears to be working. Pin 40 being low says your reset section is not working (part is being held reset).
Do you have the reset module plugged into TC1? If so, unplug him and try measuring pin 40 again.

U4 may be bad but you can't even get to checking him until resets are working.

Promoted items from the Pinside Marketplace
$ 83.00
Electronics
PinballReplacementParts
Electronics
3,150 (OBO)
Machine - For Sale
Gettysburg, PA
$ 1,159.00
Flipper Parts
Mircoplayfields
Flipper parts
3,950 (OBO)
Machine - For Sale
Centerport, NY
From: $ 1.49
Playfield - Toys/Add-ons
Daddio's 3D Printed Mods
Toys/Add-ons
3,500 (Firm)
Machine - For Sale
Johnston, IA
From: $ 10.00
Playfield - Toys/Add-ons
Toast-Mach1 Mods Shop
Toys/Add-ons
$ 12.00
Tools
Nezzy's Pinball Prints
Tools
From: $ 1.00
Playfield - Other
Rocket City Pinball
Other
$ 5.95
Playfield - Protection
The Pinball Scientist
Protection
$ 1.29
Playfield - Toys/Add-ons
Daddio's 3D Printed Mods
Toys/Add-ons
From: $ 2.99
2,950 (OBO)
Machine - For Sale
Shakopee, MN
Great pinball charity
Pinball Edu

You're currently viewing posts by Pinsider g-p-e.
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 Pinside

Great 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+!


This page was printed from https://pinside.com/pinball/forum/topic/haunted-house-system-80-mpu-boot-issue?tu=g-p-e and we tried optimising it for printing. Some page elements may have been deliberately hidden.

Scan the QR code on the left to jump to the URL this document was printed from.