Service manual

Wells-Garnder Color Vector Monitor Guide
Page 50 of 73
Appendix A: X-Y Monitor/Final Solution (sort of)
WELLS GARDNER
X-Y MONITOR/FINAL SOLUTION
By Wayne McGuire, Brady Dist, Charlotte, NC
[edited for content by Tom McClintock; additional notes by Zonn Moore]
STANDARD DISCLAIMER:
--------------------
REMEMBER, NO WARRANTEES, EXPRESS OR IMPLIED, ARE GIVEN. USE THIS
INFORMATION AT YOUR OWN RISK. I AM NOT RESPONSIBLE FOR ANY
DAMAGES THAT MAY OCCUR TO YOUR PERSON OR PROPERTY.
------------------------------
Source:
Star*Tech Journal
December 1983
Volume 5, Number 10
Pages 14 and 15
-------------------------------
We at Brady Distributing Co. pride ourselves on the service we have been able to offer our
customers. The following modifications are a product of our shop personnel and, in our
estimation, a final solution to the Wells Gardner X-Y monitor problems.
Over the past three months, we have modified every Well Gardner X-Y monitor to cross our
bench and the rate of repeated failure is such that only one has returned with a deflection
problem. These changes make the 19K6901 and 19K6103 very reliable monitors and much better
suited for the environments in which they are operated.
BRADY MODIFICATIONS FOR WELLS GARDNER QUADRASCAN COLOR X-Y
1 - INPUT PROTECTION CIRCUIT PCB ASSEMBLY
To ensure continued circuit operation, Atari Field Service suggests that you perform the
following modification:
A. Remove the lead connecting the IPC board to +27 volts on the display printed circuit
board. The lead is near Q1 and Q3 (see Fig 1.1).
B. Replace this lead with a 1K ohm, 1/4-watt resistor (see Schematic of Fig 1.1).