Service manual

Wells-Garnder Color Vector Monitor Guide
Page 12 of 73
If you feel uncomfortable about poking around inside a running game cabinet, or you cannot
reach certain areas of the monitor, there is a simple solution. Make a monitor ‘extender’ cable
that will plug into the game harness. This way, you can have the vector monitor under test
located several feet from the game and potentially in a better/safer working environment.
NOTE: There is one small exception to the universal compatibility rule for the neck board PCB.
The P328 version uses a third (purple) wire running from the innermost (normally unused) pin of
connector J501 to pin 8 of J900 on the HV unit. Without this wire, the new brightness control on
P328 is disabled. Also, and this is VERY important, if you are using a P328 PCB on a P315
wiring harness (or vice-versa), you have to turn the J501 connector upside down. Do not worry
too much about remembering the orientation because the connector's pins are gapped differently
so it will only fit onto each PCB one way (the right way) without severely bending the pins on
the neck board PCB (i.e., it is idiot-proof). This means that for testing purposes, you can swap
boards and everything will be fine, but if you want the functionality that the P328 potentiometer
provides, you must remove the associated wiring harness that connects to J501 along with the
board (or else add a new wire to the existing harness on the destination monitor). Without this
wire, a P328 will behave exactly like a P315 and the brightness control pot will do nothing.