Wells-Gardner Vector Monitor 6100 Faq And Guide Version

Wells-Garnder Color Vector Monitor Guide Page 21 of 75 HV Board Notes. 
On the HV circuit board there are two diodes, which the Atari TM-183 manual does not identify. 
They are just referred to as silicon diodes. Apparently the replacement for these is NTE558. 
Also be careful installing the zener diode ZD902. Apparently some people mistakenly install this 
at D902 instead of ZD902. The monitor will not work if you make this mistake! 
 
Please be careful if you decide to replace R918 (25K potentiometer)...

Wells-Garnder Color Vector Monitor Guide Page 22 of 75  
CAP KIT SUMMARY: 
 
Parts you need to buy in addition to the Zanen cap kit.  
 
Summary: Parts you need to buy in addition to the Zanen cap kit Quantity Description Location (1) LV2000 board (http://www.diac.com/~jeffh/lv2000/)   (1)* NTE50 (do not buy if you are installing an LV2000) Q101 (2) NTE49 (or MPSU07 (NTE188) if the heavier duty NTE49 can not 
be found) Q604, Q704 (1) 3.9 ohm ½ watt resistor R903 (2) 3.9 ohm 3 watt resistor R901, R907 (1)...

Wells-Garnder Color Vector Monitor Guide Page 23 of 75  
TESTING YOUR WORK 
 
Test the Game Board Outputs before Turning the Monitor On. 
Make sure the game board is outputting correct voltages before you power the monitor 
on! Otherwise you can waste the monitor and all the above work. To test the outputs, set 
your meter on DC volts and measure the leads of R600 and R700 (fuses) of the deflection 
board. These are connected to the plug with wire colors yellow (R600) and orange 
(R700). The correct...

Wells-Garnder Color Vector Monitor Guide Page 24 of 75 DIAGNOSING YOUR WELLS-GARDNER MONITOR  
 
All the documentation and boards for the Wells-Gardner 6100 monitors refer to X as the longer 
axis and Y as the shorter axis, independent of how the monitor is oriented in your game. 
Confusion arises because the game PCB will refer to X as the axis parallel to the floor and Y 
as the axis perpendicular to the floor and this is dependent on how your monitor is oriented. Why 
is this important to distinguish?...

Wells-Garnder Color Vector Monitor Guide Page 25 of 75  
You may want to leave the game plugged in BUT TURNED OFF for this step so that you can 
ground to the earth instead of just the chassis. If you plan to remove the HV unit, you must 
disconnect the secondary anode from the tube, which is a little tricky if you have never done it. 
Under that suction cup is a double-barb connector. The barbs extend perpendicular to the wire as 
it enters the suction cup. Simply pinch the suction cup as best as you...

Wells-Garnder Color Vector Monitor Guide Page 26 of 75 This gives reference frames for when the monitor is mounted horizontally (for games like Space 
Duel and Major Havoc conversions) and vertically (for games like Tempest). 
 
An easy way to remember which kind of transistor goes where is to know that each connector 
has one of each kind; the 2N3716s are on pins 1, 3, and 4 (key at pin 2) and the 2N3792s are on 
pins 5, 6, and 7. If the wiring has not been altered, all 2N3716s are connected to the...

Wells-Garnder Color Vector Monitor Guide Page 27 of 75 These transistors often go bad and here is a quick lesson on how to check a transistor with a 
meter. Unplug the red plugs from the deflection board to isolate the transistor from the circuit. 
From the bottom of the transistor, the configuration is:  
 
                    _ 
                   / \ 
          base -> /o o\ 

Wells-Garnder Color Vector Monitor Guide Page 28 of 75 Deflection Board 
 
On the deflection board, the most common failures are Q100 and Q101 and when these fail they 
take R100 and R101 (respectively) with them. These transistors are part of the + & - power 
supply circuit and are often bad when the resistors are really burnt. To properly test these 
transistors, they should be desoldered and removed from the PCB. Even in-circuit and not 
isolated from other components you can still get a pretty good...

Wells-Garnder Color Vector Monitor Guide Page 29 of 75 Neck Board 
 
The neck board very seldom has problems. Occasional faults will be caused from mishandling 
where someone has broken some of the pots that control the RGB drives. Check the pots if you 
are missing a color. If you are blowing your 5A fuses and your other boards are OK, check C503 
(33 uF @ 250V). If this is open, shorted or cold soldered, it will cause the 5A (or 6.25A 
depending on your board) fuses to blow. 
 
 
HV Supply 
 
Last is...

Wells-Garnder Color Vector Monitor Guide Page 30 of 75 TEMPEST DISPLAY TROUBLESHOOTING (FLOWCHART)  
 
The following flowchart is excerpted from the Star*Tech Journal, which means it was 
originally in an Atari Field Service Bulletin. 
 
Most problems in the Tempest display can be found by following the procedure shown in the 
chart below. 
 
                          No picture and... 
         +--------YES---- 5 amp fuse (F100 or F101)----NO-------+ 
         |                on Deflection PCB blows?...