Asteroids
E. Printed Circuit Board
Replacement
You may wish to remove the game printed circuit
board (PCB) or the Regulator/Audio PCB for service
or inspection. To do this, refer to Figure 10 and pro
ceed as follows:
1. Open the rear access panel.
2.
Locate the securing screws and fiber washers
that hold down the PCB in its slots, and remove
them. (The game PCB has two, the Regulator/
Audio PCB has one set of this fastening hard
ware.)
3.
If you are removing the game board, first remove
the two machine screws or tie wraps that fasten
the edge connector to the game PCB. Then
unplug the edge connector on the game PCB. If
you are removing the Regulator/Audio PCB,
simply disconnect the three small harness con
nectors on this board.
4. Carefully slide either PCB straight out of its
slots. Be careful not to twist the board, as this
may loosen connections or components. Re
place or repair as required.
5.
Reinstall the PCB, making sure that the connec
tors are properly plugged in. Note that they are
keyed to fit on only one way, so if they don’t slip
on easily, don’t force them!
A reversed connec
tor will probably damage your game
and will
void the warranty.
6.
Replace the securing screws and fiber washers
in the PCB. Reinstall the fasteners used to
secure the edge connectors to the PCB. Close
and lock the rear access panel.
7. Check that the operation of the game is correct
and
perform the self-test.
This is especially im
portant with any game when you replace a PCB.
Normally the
only
adjustments on the Asteroids
game are option switch changes (made on the
4-toggle and 8-toggle DIP switches). Unless you
are qualified technician,
do not turn any of the
knobs near the game PCB’s edge connector.
Also do not turn the small knobs on the
Regulator/Audio PCB.
Figure 10 Game and Regulator/Audio PCB Replacement
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