Service manual

Wells-Garnder Color Vector Monitor Guide
Page 39 of 73
IMPROVING YOUR WELLS-GARDNER 6100 MONITOR
Now that you have your monitor repaired and adjusted, we will discuss the variety of ways that
exist to make your monitor (or rather, your deflection board) more robust and hopefully reduce
or eliminate future failures.
OFFICIAL ATARI DEFLECTION BOARD UPGRADE
Here is some text from the Major Havoc conversion kit installation instructions (TM-268). It
describes the Atari sanctioned upgrades and includes instructions for converting all Wells-
Gardner P314 Deflection Board PCB variations to Atari's "official" upgrade. Thanks to Tony
Jones for the transcription.
Major Havoc Installation Instructions TM-268
MODIFY THE WELLS-GARDNER DEFLECTION PCB
NOTE: The following procedure applies to those Space Duel, Gravitar, and Black Widow
games that used a Wells-Gardner display.
Four versions of the Wells-Gardner display were used in the Tempest, Space Duel, Gravitar, and
Black Widow games. Perform the preliminary procedure for all versions of the display, and then
refer to Table 3 to determine which version of the four displays was installed in your game and
perform the additional procedure for that version. CAUTION! When soldering components to
the display circuitry, apply just enough heat to provide a proper electrical connection. Excessive
heat can damage the semiconductor material.
Preliminary Procedure
Perform the following procedure to modify the Deflection PCB (see Figure 6).
1. Set the display on a clean work surface.
2. Disconnect the 15-pin Molex connector from the mounting bracket on the display chassis
and the harness connectors from the Deflection PCB and the Neck PCB.
3. Use a 1/4-inch hex driver to remove the two screws securing the Deflection PCB to the
display chassis [NOTE: there are holes for two more screws in the remaining (rear) two
corners of the board which some users decided to fill; if the board will not come out,
check for this]
4. Remove the Deflection PCB from the display.
5. Connect two type-1N754A Zener diodes together, anode to anode, as shown in Figure 6.
Use a soldering iron to solder the two anode leads together.