Troubleshooting guide

Cinematronics Vector Monitor Repair Guide v.1.0
Page 29 of 53
• Make all Factory Upgrades, including the LF13331 modification above.
General Monitor Repair That Should Always Be Performed
• There are 4 neck wires (Yellow, Red, Green, and Blue) with white "things" inline with each
wire. Inside the ‘things’ are 1K ½ watt resistors. The resistor wires will break at some point.
You can either replace them, or cut them off and splice around them. While you are
working on these wires, ensure that none of them have broken off the monitor PCB, as this
is very common.
• Resolder all the connector pins on J1 and J2. Cracks from connector wiggling are quite
common. Also resolder the connections of the yoke wires where they meet the monitor
PCB.
• Check C102/202 for broken legs.
• Check the outputs of the voltage regulators (IC4, IC6, IC8). They should be +15V, -15V,
+5V respectively.
• Check the output damping diodes D114, D115, D214, D215.
• Make very good ground (common) connections between the monitor, CCPU and power
supply for reliability. Solder fat conductors with nasty heavy gauge connectors between
each component in the system. Replace any components on your game power supply that
need it such as the electrolytic capacitors.
• When replacing any resistors, use only Metal Film resistors as they have much higher
tolerances and are not much more expensive than the common carbon composition
resistors.