(Topic ID: 90394)

Gottlieb System80b (Problem solved)

By 2Kaulitz

9 years ago


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  • 55 posts
  • 16 Pinsiders participating
  • Latest reply 9 years ago by 2Kaulitz
  • Topic is favorited by 2 Pinsiders

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#4 9 years ago
Quoted from Scotty78:

it just has some design flaws, nothing that can't be fixed.

+1

Those machines CAN be very reliable

#10 9 years ago

Huhh...

Quoted from 2Kaulitz:

I'm getting 5.4v out of it but at my mpu its only 4.3v

SECOND...you have to fix a connector J1 on MPU...voltage difference (from 5,4V to 4,3V) and(or)
J1 on the MPU ( poor, weak contact, oxidation...broken pin IN connector...etc, etc )

But.....FIRST - "MUST" replace (hidden...on your picture ) trim pot for propper (and stabile) adjustment
"+5V " ( it's ok from 5,0V to 5,2 V... higher voltage is NOT recommended ! )

When you install NEW & quality trim pot - DISCONNECT upper connector from +5V regulator board, and
measure (with DMM) and adjust +5,15V

Of course...in the meantime - connector J1 is fixed ?

Greetings from Croatia

#22 9 years ago

It's OK to examine additional reset board on TC1.... BUT (from my point of view MORE important
is to take care of +5v supply.....contacts on J1, and proper adjustment (with "those" trim-pot )

#34 9 years ago

The voltage problem is solved ? Did I miss something?

#42 9 years ago
Quoted from cro_pinman:

But.....FIRST - "MUST" replace (hidden...on your picture ) trim pot for propper (and stabile) adjustment

Perhaps you have wondered why I insisted on replacing trim pot?
After several similar cases (about 20 years before ) such as this was, this procedure is for me
became 'what MUST to be done' !

At my pinballs, I removed them - ALL (I WAS operator/tech over 25 years )

Now...it's (nice) hobby )
(I'm sure - you understand me )

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