Wells-Gardner Vector Monitor 6100 Faq And Guide Version

Wells-Garnder Color Vector Monitor Guide Page 71 of 75 SPOT KILLER 
 
The purpose of the spot killer is to turn off the video intensity amplifiers when deflection is not 
occurring. Failure of the spot killer can cause the phosphor coating on the picture tube to become 
burned. 
 
The two signal input voltages to the spot killer are taken from resistors R610 and R710 in the X 
and Y deflection circuits. Diodes D801 through D804 and Capacitors C800 through C803 form 
two separate voltage doublers. The...

Wells-Garnder Color Vector Monitor Guide Page 72 of 75 Appendix D:  Common Ground Connections  
 
 
From: John Robertson  
Newsgroups: rec.games.video.arcade.collecting 
Subject: TechTIP: How to make VECTOR MONITORS very RELIABLE! 
Date: 22 Oct 2001 
 
 
It’s been a little while since my last Tech Tip, but this is something that’s been on my mind for a 
while now, and a posting in the Vector mail-list got the following response from me...: 
 
Vector monitors blow up because the ground reference for the...

Wells-Garnder Color Vector Monitor Guide Page 73 of 75 Appendix E:  Vector Monitor Slew Rates  
 
Vector Monitor Slew Rates 
Courtesy of Jon Raiford 
 
Here is a table of Vector Monitor Slew Rates. Slew rate is a measure of the maximum rate-of-
change of the voltage output.  Put into context, a slew rate is the measure of how fast the 
deflection amplifier can make FULL-SCALE transitions, driving the CRT beam around the 
screen. As the slew rate increases, more objects can be drawn on-screen at the same...

Wells-Garnder Color Vector Monitor Guide Page 74 of 75 Appendix F:  Testing Transistors  
 
Most of the failures in the Wells-Gardner 6100 monitor (as is the case with most electronic 
devices) are semiconductor failures, specifically, the transistors. All transistors discussed in this 
document can be tested in the same way; it does not matter if they are the large chassis-mounted 
transistors or the tiny PCB-mounted transistors. With the transistors out of circuit, set your multi-
meter on Rx1K scale...

Wells-Garnder Color Vector Monitor Guide Page 75 of 75 combinations should show a resistance and that value should be 2.5K Ohms; none of the 
resistances should be 0 Ohms (shorted). 
  
TESTING TRANSISTORS WITH A DIGITAL MULTI-METER 
 
Set your meter to the diode test. Connect the red meter lead to the base of the transistor. Connect 
the black meter lead to the emitter. A good NPN transistor will read a JUNCTION DROP 
voltage of between 0.45v and 0.9v. A good PNP transistor will read OPEN. Leave the red...