Service manual

Wells-Garnder Color Vector Monitor Guide
Page 6 of 73
The Amplifone uses a neck socket that is the same as most other (non-vector) monitors, but the
Wells-Gardner uses a different socket.
The Wells-Gardner 6100 series uses a 100-degree RCA picture tube (19VLUP22) while the
Amplifone uses a 90-degree medium resolution Rauland tube (M48AAWOOX).
It is pretty easy to check to see if your tube is bad (it does not happen often, but it does happen).
Pins on the tube neck are counted counter-clockwise starting at the gap (when looking at the
backside of the tube). Pins 9 and 10 are at either end of the heater element. If you want to be
absolutely certain about which pin is which, check the socket on your neck board (it should
number all the pins). The heater is basically a very low wattage light bulb that emits the
electrons, which are shot at the phosphor to make light. You should read a short (all right, not a
short but a VERY low resistance) across pins 9 and 10 if your heater is OK. If you read an open,
your tube is toast and there is nothing you can do (your light bulb is burned out). If your heater is
OK, check to make sure that the heater pins are not shorted to any of the emitter cathodes (pins
6, 8, and 11). If you see a short then your tube has a serious problem but in many cases the short
can be burned away. Call your local TV repair shop to see if they can "rejuvenate" it.
Deflection Board Pinout
Here is the complete pinout of the main connector (on the deflection board):
1. Red input (4.0V full on; 1.0V black level)
2. Green input (4.0V full on; 1.0V black level)
3. Blue input (4.0V full on; 1.0 black level)
4. Red GND (twisted pair with Red input)
5. Green GND (twisted pair with Green input)
6. Blue GND (twisted pair with Blue input)
7. X input (16V Peak-to-Peak; 2.5Kohms)
8. Y input (12V Peak-to-Peak; 2.5Kohms)
9. Not Used (Key)
10. X GND (twisted pair with X input)
11. Y GND (twisted pair with Y input)
12. Power GND
13. 25V RMS
14. Power GND
15. 25V RMS
SPECIAL NOTE: The 2nd printing of the Wells-Gardner Quadrascan Color X-Y Display
manual (TM-183) has a typo in Figure 8 on page 11, which incorrectly identifies the heater as
existing on pins 5 and 6. Strangely enough, both the 1st and the 3rd printings have the correct
numbers.