Unison Processor does not turn on
The information in this post is provided to assist in troubleshooting. Perform work at your own risk. ENSURE ANY POWER FROM DEVICES HAS BEEN DISCONNECTED BEFORE SERVICING ANY EQUIPMENT. If you do not feel comfortable performing the work, please contact us or your local service center. Be aware that ETC and its Affiliates are not responsible for any damage or injury caused by service of our products by anyone other than us or our authorized service providers, and such damage is excluded from the product’s warranty.
Symptoms/Issue
- Power going into the rack tests OK. All fuses are OK
- Unison processor does not turn on
- LCD is dark with no text or may be flickering
- Unison processor is chirping or buzzing
Note: The LED on the overlay will not be blinking with any of these symptoms. If the LED is blinking, then there is likely a problem with the LCD
Description/Explanation of Issue
A capacitor located at C28 on the dimming engine board (7083B5002) has likely failed and requires replacement. Most often, this is in a 277V system, though it can happen in 120V systems.
Note: On CMd processors, there will be a jumper attached to J7 that may appear to be blown or damaged. This is normal. The jumper is a dummy load resistor intended to keep a sufficient load on the engine board and keep the regulated power stable. The damage is cosmetic only. The heat shrink around the resistor cracks over time from the heat generated by the dummy load resistor.
Fix/Solution
- Please contact your preferred ETC dealer for repair or ETC Technical Services to begin the RMA process