Wells-Gardner Vector Monitor 6100 Faq And Guide Version

Wells-Garnder Color Vector Monitor Guide Page 41 of 75  
Symptom: Waveform At IC901 Outputs; If Missing, Check: 
 
· R914 and/or R927 (wrong value)  
· R916 (broken wire) 
  
Symptom: Waveform At Q906; If Missing, Check: 
 
· R926 (open)  
· Q906 (white wire open)  
· Q905 (emitter open) 
  
Symptom: Waveform At Q905; If Collector Wrong, Check: 
 
· Q906 (broken black lead or broken wire at emitter) 
  
Symptom: Waveform At R921; If Wrong, Check: 
 
· Q906 (white and black leads interchanged at socket)...

Wells-Garnder Color Vector Monitor Guide Page 42 of 75 · Q905 (reversed or collector wire broken)  
· IC901 (defective, reversed, or unseated pins)  
· T901 (pins unseated or primary winding shorted)  
· Broken wire at R913  
· Broken wire at R919  
· Broken wire at base or collector of Q905  
· Broken wires or pins at P900  
· White wire disconnected at Q900  
· Red wire disconnected at Q906 
  
Symptom: If You Are Also Blowing Any Fuses, Check: 
 
· C910 (reversed)  
· R907 (open)  
· R913 (shorted)...

Wells-Garnder Color Vector Monitor Guide Page 43 of 75  
Symptom: HV Range Wrong, What Causes It? 
 
Normal HV range is between 16-24 kV 
 
HV Voltage Range Look at ??.?-12.0 kV Q902 (reversed) 7.0-10.0 kV ZD902 (bad) 7.0-17.0 kV ZD902 (bad) 7.0-22.0 kV Q903 (bad) 9.0-18.0 kV ZD902 (bad) 11.0-22.0 kV ZD902 (bad) 15.0-18.0 kV ZD901 (wrong value) 16.0-19.0 kV ZD902 (bad) 18.0-27.0 kV ZD902 (bad) 19.0-27.0 kV R912 (wrong value) 21.7-30.5 kV C916 (open) 28.0-20.0 kV C916 (bad)   

Wells-Garnder Color Vector Monitor Guide Page 44 of 75 FINE-TUNING THE PICTURE  
 
Now that you have a working monitor (and game board), it is time to fine-tune your picture. 
Before making any adjustments, turn your game on and let it warm up for at least 10 minutes. 
R918 is the HV adjust and unless you have an HV probe, you probably should not mess with it. 
If you have an HV probe, set the HV for 19.5 kV with zero beam current (i.e., with the game 
boards disconnected from the machine so that no...

Wells-Garnder Color Vector Monitor Guide Page 45 of 75  
Size and Position 
 
The manuals do not talk much about adjusting the size and positioning of your screen but that is 
easy to do. There are small potentiometers on the game board that are clearly labeled which 
control X and Y centering as well as X and Y size. There are no positioning or size adjustments 
on the monitor itself. 
 
The following adjustments refer to the eight tiny blue and/or black potentiometers found on the 
game board. If your...

Wells-Garnder Color Vector Monitor Guide Page 46 of 75 · Adjust the LIN pots: Adjust the X-LINEAR (R169) and Y-LINEAR (R165) so that the 
diagonal lines are straight. Since the LIN pots change the size of the displayed picture 
on the screen, you may have to readjust the SIZE pots in order to get the correct 
adjustment. 
 
  
White Balance Adjustment 
(From sections of TM-183) 
 
Here is a summary of the white balance adjustment sections of TM-183. This is paraphrased and 
abridged since the information...

Wells-Garnder Color Vector Monitor Guide Page 47 of 75  
COLOR PURITY 
(Figure 6; from sections of the Wells-Gardner Service Manual) 
 
 
As far as adjusting purity (red gun hits red phosphors only, green gun hits green, etc.) and 
convergence (red, green, and blue guns hit adjacent dots to make white instead of separate 
colors), the manual does a decent job of walking you through the procedure. 
 
For best results, it is recommended that a purity adjustment be made with the monitor facing 
west or...

Wells-Garnder Color Vector Monitor Guide Page 48 of 75 other colors, move the 2 purity magnets with respect to each other in order to center 
green crosshatch on the screen. 
 
5. Push deflection yoke forward gradually, until crosshatch is a uniform green (pure in 
color) across the entire pattern. The deflection yoke should now be secured in place. 
 
6. Both red and blue colors are to be checked for uniformity and true color. Reposition the 
deflection yoke, if necessary, to obtain optimum purity of...

Wells-Garnder Color Vector Monitor Guide Page 49 of 75  
ADJUSTMENT OF DYNAMIC CONVERGENCE (continued) 
 
NOTE: 
1. Tilting the angle of the yoke up and down adjusts the crossover of both vertical and 
horizontal red and blue lines (Figures 8a and 8b).  
2. Tilting the angle of the yoke sideways adjusts the parallel convergence of both horizontal 
and vertical lines at the edges of the screen (Figures 9a and 9b).  
3. Use three rubber wedges (tapered rubber wedges are used for this purpose.)  
4. The...

Wells-Garnder Color Vector Monitor Guide Page 50 of 75  
ADJUSTMENT OF DYNAMIC CONVERGENCE (continued) 
 
 
FIGURE 8B 
                   +---------------------------+         \ 
                   |        R    G    B        |          \  
                   |         \   |   /         |     ------\------+ 
                   |          \  |  /          |     \      \-----+ 
                   |  B___     \ | /     ___R  | S V  \ DY  /\ 
                   |      ---___\|/___---      | I I   \   /  \...