On a Volcano there are four 6 digit score displays, if some one was to accidentally remove the connector from the displays while it was on and it screwed up the other displays what would need to be looked at or done? So a little background a friend was having issues with two of the displays intermediately working and then would lose a digit or segment. I thought to wiggle the IDC wires maybe a bad connection and then maybe try to re-seat the connector not realizing i forgot to mention while game is off (DUH). Well the connectors were removed and reseated with game powered on and now there is Digit#2 on players 1-3 and a few segments missing on all four displays are out. I believe it to be a data problem know more than a power or connectivity issue but correct me if not. From what i read on wiki the digits and segments are controlled by logic IC.
Taken from Wiki: NOTE: Do not connect or disconnect the display connectors or connectors A1J2 and A1J3 on the MPU (right hand side) with the power on! Doing so WILL damage the MPU board display logic ICs.
Display Issue With Multiple Displays
If the problem shows up on two or more displays, suspect one of the two connectors on the CPU board (A1J2 or A1J3), one of the two connectors on the two displays (they are daisy-chained with an IDC connector), or the chips which control the display data on the CPU board. If there is a digit issue, the issue will be present on player 1 and 3 or player 2 and 4 displays. If there is a segment issue, the issue will be present on player 1 and 2 or player 3 and 4 displays, and the status display. If more than 4 scoring displays are used, on games such as Pink Panther, Black Hole, Haunted House, Devil's Dare, etc., consult the game manual for display digit and segment mapping.
The charts listed below, map out each signal to each specific display. The first chart maps the display digit information, while the second and third charts map the display segment information. This information only applies to games where 4 scoring displays and 1 status display are used, although digit group names have been added, if more displays are used. All of the charts apply to System 80 and 80A, but not 80B.
Display Digit Information
Digit Number Display(s) CPU Pin Connection Chip on CPU Board - Pin
D16 (80A only) Players 1 & 3 (Group F) A1J3-16 Z26-8
D1 Players 1 & 3 (Group D) A1J3-1 Z17-4
D2 Players 1 & 3 (Group D) A1J3-2 Z17-6
D3 Players 1 & 3 (Group D) A1J3-3 Z17-12
D4 Players 1 & 3 (Group D) A1J3-4 Z17-10
D5 Players 1 & 3 (Group D) A1J3-5 Z17-8
D6 Players 1 & 3 (Group D) A1J3-6 Z24-2
D13 (80A only) Players 2 & 4 (Group F) A1J3-13 Z26-4
D7 Players 2 & 4 (Group E) A1J3-7 Z24-4
D8 Players 2 & 4 (Group E) A1J3-8 Z24-6
D9 Players 2 & 4 (Group E) A1J3-9 Z24-12
D10 Players 2 & 4 (Group E) A1J3-10 Z24-10
D11 Players 2 & 4 (Group E) A1J3-11 Z24-8
D12 Players 2 & 4 (Group E) A1J3-12 Z26-2
D13 Status (Group F) A1J3-13 Z26-4
D14 Status (Group F) A1J3-14 Z26-6
D15 Status (Group F) A1J3-15 Z26-10
D16 Status (Group F) A1J3-16 Z26-8
Display Segment Group A Information
Segment Display Group CPU Pin Connection Chip on CPU Board - Pin
a Segment Group A A1J2-1 Z19-13
b Segment Group A A1J2-2 Z19-12
c Segment Group A A1J2-3 Z19-11
d Segment Group A A1J2-4 Z19-10
e Segment Group A A1J2-5 Z19-9
f Segment Group A A1J2-6 Z19-15
g Segment Group A A1J2-7 Z19-14
h Segment Group A A1J2-8 Z16-12
So if Digit 2 is out on player 1 and 3, i would want to replace the Z17-6 chip? I have several segment a out as well like a on player 2 any chance someone knows what chips they are? Im pretty sure i am reading chart right. Segment a on player 2 be chipz19-13?Digit and segment chips different? Where can i buy them GPE?