Wells-Gardner Vector Monitor 6100 Faq And Guide Version

Wells-Garnder Color Vector Monitor Guide Page 61 of 75 3 - X CHANNEL CURRENT LIMITER 
 
The X channel of this monitor must do more work than the Y channel. This modification limits 
the amount of current that can be delivered to the load and the X channel output transistors are 
moved so they may be more efficiently cooled by convection currents. 
 
A. Remove the plug from J700 and reconnect at J600. The cable of P700 will need to be 
lengthened before this can be done. This move connects the transistors...

Wells-Garnder Color Vector Monitor Guide Page 62 of 75 4 - HIGH VOLTAGE POWER SUPPLY 
 
These changes to the high power supply should reduce incidence of failure due to high 
temperatures and/or low voltage power supply failures. 
 
A. Replace capacitors C901 and C902 with 220F 50V capacitors. [Original capacitors 
are 100uF 50V.] 
 
B. Replace transistors Q901 and Q902 with transistor type 2N2102. [Originals are 
MPSA06.] Place a heat sink for a T0-39 package on Q901. Take care not to allow the two...

Wells-Garnder Color Vector Monitor Guide Page 63 of 75 mostly just the tempest attract mode. So there could be some unknown problems with this. 
It is also very possible that some other resistor values might need changing in the voltage 
regulator to compensate for the lower input voltage. (Lowering R905, R906 and R913 come 
to mind. And it might be a good idea to re-route R917 to a position in front of the pre-
regulator.) 
 
By dropping the voltage with a pre-regulator you move much of the heat...

Wells-Garnder Color Vector Monitor Guide Page 64 of 75  
Schematic 2.1  
 
Schematic 3.1   

Wells-Garnder Color Vector Monitor Guide Page 65 of 75  
Schematic 4.1  
 
Figure 4.2  
  

Wells-Garnder Color Vector Monitor Guide Page 66 of 75 Appendix B:   How To Make A Tempest Monitor Trouble-Free  
 
Here is an article from the April 15, 1983 issue of Play Meter magazine (page 191). The article is 
from a regular feature in the magazine called FRANKS CRANKS by Frank The Crank 
Seninsky. 
 [what does this modification do??? More detail here!] 
 
HOW TO MAKE A TEMPEST MONITOR TROUBLE-FREE. 
 
Ataris Tempest, when it is working, is not a bad game. Its just a shame that the monitors only...

Wells-Garnder Color Vector Monitor Guide Page 67 of 75  
FIRST HALF 
 
Take the anode ends (the ends opposite from the marked rings) of a 1N914 and a 1N4737, and 
solder them to one end of a 1K-ohm resistor so that it looks like this:  
 
                               ANODE +------+-+ CATHODE 
                            +--------+1N4737| +--------+ GROUND 
CATHODE +-+------+ ANODE   /         +------+-+        | 
--------+ | 1N914+--------+                           ===  C700 
R700    +-+------+...

Wells-Garnder Color Vector Monitor Guide Page 68 of 75  
FINAL TWO-MINUTE WARNING 
 
Make sure that none of the wires of this modification can come into contact with the other board 
components [easy to do; there is a lot of bare PCB in this area; you may want to tape/glue the 
leads down], especially the brown ground wire located to the right of R700. If the modification 
hits this brown wire, you can consider it a fumble and you just blew your lead and the game.  
  

Wells-Garnder Color Vector Monitor Guide Page 69 of 75 Appendix C:  Theory of Operation  
 
THEORY OF OPERATION:  Wells Gardner Quadrascan Color X-Y Monitor 
 
 
CAUTION!!! LETHAL VOLTAGES ARE PRESENT IN THIS MONITOR, IF YOU HAVE ANY DOUBTS ABOUT YOUR ABILITY DO NOT ATTEMPT TO REPAIR YOUR MONITOR!!  
 
The “Quadrascan” color X-Y display was designed and built by Wells Gardner Electronics Corp. 
This display differs VERY LITTLE from the Electrohome G-05 Black and White X-Y monitor. 
The only difference is...

Wells-Garnder Color Vector Monitor Guide Page 70 of 75 DC (about 35V). Capacitors C100 and C101 form the first stage of filtering.  Resistors R102 and 
R103 and capacitors C102 and C103 form two low-pass filters which help filter out AC ripple.  
Transistors Q100 through Q103 form and active filter that provides the stable, filtered DC 
voltages. 
 
The degaussing coil operates when power is first applied to the display, when the PTP(positive 
temperature coefficient) thermistor is cool. Diodes D106 and...