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Electronic Theatre Controls Inc

CEM3 Not Powering Up

There are multiple reasons for a CEM3 not powering on. Below is a list of possibilities, listed in order of most to least frequent:

Not Powering Up - Test Mode

Symptoms

Unit appears to be off or not working
LCD off
No LEDs on
UI Network LED barely on
All dimmer outputs on

Explanation of Issue

The switch located at S3 is very likely in the test position and is often forgotten to be returned to normal while troubleshooting or testing other issues.

This switch holds the board in reset, making it appear to be off or not powering up. It also forces all outputs to HI, which is typically used while energizing a system to test that it is functioning

Fix/Solution

Move the switch at S3 to the Normal position

CEM3TestSwitch_LI.jpg

If this does not resolve the problem, there may be deeper issues that may not be repairable in the field. Please contact ETC Technical Services if this is the case

 

Not Powering On - Cap in the Hat Damage

Symptoms

Unit does not turn on
LEDs may flicker rapidly (3-6 quick flickers per second)
Unit may also be emitting a quiet, high-pitch squeal, or making a faint ticking sound

Explanation of Issue

It is highly likely the cap in the hat (C31) has a damaged barrel. The capacitor may have been hit during install or removal. This causes one of the barrels to rip out of the PCB, effectively removing the capacitor from the circuit. C31 is the bulk capacitor that filters the ripple voltage (50Hz or 60Hz). With it effectively removed from circuit, the regulators further down in the circuit cannot compensate for the ripple, causing them to rapidly oscillate between off and on.

Fix/Solution

This cannot be fixed in the field. Please contact ETC Technical Services to begin the RMA process

 

Not Powering Up - Capacitors Bulged and Leaking

Symptoms

Capacitors at C42, C47, C56 near the left side of the board appear to be leaking or bulged
Same capacitors may be popped

Explanation of Issue

This is typically caused by a broken solder joint for C36

Fix/Solution

Please contact ETC Technical Services to begin the RMA process

 

Not Powering On - 5V rail shorted

Symptoms

Unit is not powering on
Unit may also be emitting a faint, high-pitch squeal
+5V rail is shorted to ground

Explanation of Issue

One or more components on the +5V failed shorted. This will likely be the USB voltage switcher chip that failed

Fix/Solution

As this issue cannot be fixed in the field, please contact ETC Technical Services to begin the RMA process

 

Not Powering On - 24V rail shorted

Symptoms

Unit is not powering on
Unit may be emitting a faint, high-pitch squeal
+24V rail is shorted to ground

Explanation of Issue

One or more components on the +24V rail have failed shorted

Fix/Solution

As this issue cannot be fixed in the field, please contact ETC Technical Services to begin the RMA process

 

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