Difference between revisions of "Baby Pac-Man"

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(Added information on the board connectors)
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===Connectors===
 
===Connectors===
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[[File:Baby-pacman-idc-connectors.jpg|200px|thumb|left|IDC Connectors]][[File:Baby-pacman-0-100-molex-connector.jpg|200px|thumb|right|0.100" Molex Connector]]The [http://en.wikipedia.org/wiki/Insulation-displacement_connector IDC connectors] in this machine are a weak link. They were a cost-cutting measure when these machines were originally built, and as a result, often fail and need to be re-pinned because either the wire pops out of the pin in the connector, or the connector pin gets too loose and can't make contact with the header pins. This can be a source of many problems. It can sometimes appear as a consistent discontinuity issue, an intermittent issue as the machine moves/vibrates, or as heat causes things to expand and possibly loose contact. It is a good idea to replace any problematic IDC connectors with molex KK-series connectors. Some individuals recommend only replacing the connectors with problems to save some time, while others recommend just replacing them all at once in order to avoid potential future issues with the IDC connectors.
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The connectors can be purchased from [https://www.greatplainselectronics.com Great Plains Electronics] and [http://www.bigdaddy-enterprises.com Big Daddy Enterprises]. The 0.100" 25-pin and 28-pin connectors have been discontinued, so they may be difficult to obtain. If necessary, two smaller connectors can be used side-by-side in place of the larger 25 or 28-pin connectors.
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When re-pinning the connectors, note that there are a few pins that have two wires connected to a single pin on the MPU boar's J2 connector and the Vidiot board's J8 connector. The wiring for all the connector pins can be found on page 38 in the manual on the diagram labeled "Wiring Diagram Video-Pin Cabinet".
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Baby Pacman uses both 0.100" header pins and 0.156" header pins.
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{|class="wikitable"
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|-
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! Board
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! Connector
 +
! Pins
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! Pin Size
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|-
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| MPU
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| J1
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| 28
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| 0.100"
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|-
 +
| MPU
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| J2
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| 15
 +
| 0.100"
 +
|-
 +
| MPU
 +
| J3
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| 16
 +
| 0.100"
 +
|-
 +
| MPU
 +
| J4
 +
| 19
 +
| 0.100"
 +
|-
 +
| Driver
 +
| J1
 +
| 15
 +
| 0.100"
 +
|-
 +
| Driver
 +
| J2
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| 12
 +
| 0.100"
 +
|-
 +
| Driver
 +
| J3
 +
| 15
 +
| 0.100"
 +
|-
 +
| Driver
 +
| J4
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| 10
 +
| 0.156"
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|-
 +
| Driver
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| J5
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| 6
 +
| 0.156"
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|-
 +
| Driver
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| J6
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| 12
 +
| 0.156"
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|-
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| Driver
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| J7
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| 6
 +
| 0.156"
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|-
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| Driver
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| J8
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| 25
 +
| 0.100"
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|-
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| Driver
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| J9
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| 10
 +
| 0.100"
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|-
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| Driver
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| J10
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| 6
 +
| 0.156"
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|-
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| Driver
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| J11
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| 6
 +
| 0.156"
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|-
 +
| Vidiot
 +
| J1
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| 28
 +
| 0.100"
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|-
 +
| Vidiot
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| J2
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| 20
 +
| 0.100"
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|-
 +
| Vidiot
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| J3
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| 12
 +
| 0.156"
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|-
 +
| Vidiot
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| J4
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| 12
 +
| 0.156"
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|-
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| Vidiot
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| J5
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| 2
 +
| 0.156"
 +
|}
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===Monitor===
 
===Monitor===

Revision as of 20:21, 10 February 2015

ExclamationPoint.jpg
Note: This page is a work in progress. Please help get it to a completed state by adding any useful information to it.


1 Introduction

2 Technical Info

2.1 System Overview

3 Problems and Fixes

3.1 Connectors

IDC Connectors
0.100" Molex Connector

The IDC connectors in this machine are a weak link. They were a cost-cutting measure when these machines were originally built, and as a result, often fail and need to be re-pinned because either the wire pops out of the pin in the connector, or the connector pin gets too loose and can't make contact with the header pins. This can be a source of many problems. It can sometimes appear as a consistent discontinuity issue, an intermittent issue as the machine moves/vibrates, or as heat causes things to expand and possibly loose contact. It is a good idea to replace any problematic IDC connectors with molex KK-series connectors. Some individuals recommend only replacing the connectors with problems to save some time, while others recommend just replacing them all at once in order to avoid potential future issues with the IDC connectors.


The connectors can be purchased from Great Plains Electronics and Big Daddy Enterprises. The 0.100" 25-pin and 28-pin connectors have been discontinued, so they may be difficult to obtain. If necessary, two smaller connectors can be used side-by-side in place of the larger 25 or 28-pin connectors.

When re-pinning the connectors, note that there are a few pins that have two wires connected to a single pin on the MPU boar's J2 connector and the Vidiot board's J8 connector. The wiring for all the connector pins can be found on page 38 in the manual on the diagram labeled "Wiring Diagram Video-Pin Cabinet".

Baby Pacman uses both 0.100" header pins and 0.156" header pins.

Board Connector Pins Pin Size
MPU J1 28 0.100"
MPU J2 15 0.100"
MPU J3 16 0.100"
MPU J4 19 0.100"
Driver J1 15 0.100"
Driver J2 12 0.100"
Driver J3 15 0.100"
Driver J4 10 0.156"
Driver J5 6 0.156"
Driver J6 12 0.156"
Driver J7 6 0.156"
Driver J8 25 0.100"
Driver J9 10 0.100"
Driver J10 6 0.156"
Driver J11 6 0.156"
Vidiot J1 28 0.100"
Vidiot J2 20 0.100"
Vidiot J3 12 0.156"
Vidiot J4 12 0.156"
Vidiot J5 2 0.156"


3.2 Monitor

3.3 Vidiot Board

4 Paperwork

Manuals, schematics, coin cards...

5 Rubber Rings

Rubber Ring Sizes goes here

6 Photos

Teardown photos go here

7 References

8 Repair Logs

Did you do a repair? Log it here as a possible solution for others.

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