Troubleshooting guide

Cinematronics Vector Monitor Repair Guide v.1.0
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If breakers trip: Problem is in coin meter circuit or call factory for help.
If breakers don’t trip: Repair audio board. POWER OFF, reconnect molex plug to monitor. Turn
power on to see if there is a good picture. If the picture is bad, problem is probably in the monitor.
If breakers trip: Check LED and +5 volt supply. If LED and + 5 volts is O.K., problem is probably
in monitor.
Symptom: No Audio.
 Check for open speaker coil.
 Check transistors 2N6292 and 2N6107 and nearby output components on audio board with
ohmmeter or transistor checker.
 Check 7815 and 7915 outputs.
 Check for open wiper on volume control mounted
 Refer to audio board theory of operation and troubleshooting guide.
 Replace F2 on logic board.
Symptom: Coin Counter is Inoperative.
 Check 2N6292 transistor on logic board with ohmmeter or transistor tester. Verify proper
operation of A4 by grounding A4 pin 1. Coin counter should click.
 Disconnect coin counter molex connector.
 Measure DC voltage on red wire. Meter should read +25 volts DC.
Symptom: Gives No Credits.
 Tie E4 pin 12 to ground. If credits fail to appear, replace E4. If credits appear, disconnect
logic board ribbon J3. Measure +5 volts on A4 pins 1 & 5. If missing, replace pull up
resistor pack C2.
 Alternately ground A4 pins 1 & 5. If credits appear, problem is in switches on coin door.
 Verify proper coin door microswitch operation.
 Reconnect J3. Observe A4 pins 3 & 6 alternately while depressing microswitch lever on
coin mechanism. Pins 3 & 6 should change states. Replace A4 (if they do not change
states).
 Replace F2 (74LS259) on logic board.