Kid Raster
Well-known member
Hey everyone-
I'm looking to you William's experts out there.
Let me start by saying that I have even tried sitting in a chair in front of this machine
and stared at it for hours, hoping to will it to work.
Here's the story....
this Robotron used to work great.
One day we plugged it in, and it did not.
Work log summary:
Error code '1-2-1'
Suggestion:
Possible bad RAM chip at location '2-1'
Purchased new chips, replaced all RAM chips.
Turned machine on.
Error '1-2-1'
Next, it was suggested the voltages were incorrect.
Purchased new switching PSU from Bob Roberts.
Installed switch, verified 12.0v and +5.0v at output of switch and at board.
Turned machine on.
Error '1-2-1'
Next, it was suggested that all cables/terminals on the board may need to be
cleaned and/or reseated.
Removed all cables and connectors from board.
Cleaned all connectors and pins.
Reconnected all cables and connectors to board
Turned machine on.
Error '1-2-1'
Next, it was suggested the socket at location '2-1' had cold solder.
Removed RAM chip from socket at location '2-1'.
Re-flowed solder on all pins on socket at location '2-1'.
Replaced RAM chip into socket.
Turned machine on.
Error '1-2-1'.
Next, the battle-axe was removed from the attic.....
Anyway...
The machine is dedicated original other than the switching PSU.
Please help if you can!
The survival of the last human family depends on you!!!
I'm looking to you William's experts out there.
Let me start by saying that I have even tried sitting in a chair in front of this machine
and stared at it for hours, hoping to will it to work.
Here's the story....
this Robotron used to work great.
One day we plugged it in, and it did not.
Work log summary:
Error code '1-2-1'
Suggestion:
Possible bad RAM chip at location '2-1'
Purchased new chips, replaced all RAM chips.
Turned machine on.
Error '1-2-1'
Next, it was suggested the voltages were incorrect.
Purchased new switching PSU from Bob Roberts.
Installed switch, verified 12.0v and +5.0v at output of switch and at board.
Turned machine on.
Error '1-2-1'
Next, it was suggested that all cables/terminals on the board may need to be
cleaned and/or reseated.
Removed all cables and connectors from board.
Cleaned all connectors and pins.
Reconnected all cables and connectors to board
Turned machine on.
Error '1-2-1'
Next, it was suggested the socket at location '2-1' had cold solder.
Removed RAM chip from socket at location '2-1'.
Re-flowed solder on all pins on socket at location '2-1'.
Replaced RAM chip into socket.
Turned machine on.
Error '1-2-1'.
Next, the battle-axe was removed from the attic.....
Anyway...
The machine is dedicated original other than the switching PSU.
Please help if you can!
The survival of the last human family depends on you!!!


