Service manual

7: Troubleshooting Guide

CHRISTIE INC. CHRISTIE INC. - - 35/70 Service/PM Manual

July, 1997

READY DIAGNOSTIC TABLE

1-3

LED is on – CONDITION 3: LED #1 is on.

Step Diagnostic Result

1 If LED #1 is illuminated, center the Lower Torque Arm, press the NOT

RDY button, and ensure that the LED goes out. If the LED remains lit,

proceed to Step 2.

2 Check the limit switch and associated wiring. If the LED is still lit,

proceed to Step 3.

Monitor output voltage from the optical pot. Verify range of +5 to -5

volts as arm is moved to its extremes; zero volts should be near the

center of travel. Readjust if necessary.

4 Measure the output voltage from the lower tacho generator. This should

be approximately +3.0 volts with the projector running in REWIND.

Replace generator if necessary.

5 If the LED still remains lit, the 2267 keypad or the 2293 CPU/Main

Logic card could be defective. Repair or replace as necessary.

1-4

LED is on – CONDITION 4: LED #2 is on.