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Author Topic: NEC NC800C error Amanda Mundin Expert Film Handler Posts: 122 From: Belper, Derbyshire, UK Registered: Sep 2005 posted 02-01-2014 11:38 AM                     The Error Message description doesn't always describe the problem correctly. Last year we changed a bulb/module (same NEC NC800C), it was a little dusty inside, tried to remove some of this including lightly dusting the lamp cover open switch. When we refitted the back and switched on an error message came up that said something like Lamp Cover Open, thought we'd maybe damaged the switch. A call to an engineer and they told us the same fault can be triggered by the chip on the back of the lamp module not contacting correctly, pulled the module and whoever had fitted the new bulb into the module had attached the new chip the wrong way round, unscrewed and turned the chip around, refitted and worked fine, but the error message wasn't very helpful in describing what the actual problem was!  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 02-01-2014 01:33 PM                     Jason, the error 52,53 has been cleared with the new interface board. We are now getting error 26...tamper switch activation detected...Nothing will work until that is cleared. Amanda, the lamp door open error is a pain in the ass. If the chip is not perfectly positioned, you will get that error. Almost half the time we change the lamp, we have to shim the chip.  |  IP: Logged Stefan Vogels Film Handler Posts: 48 From: Aarle-Rixtel, Noord-Brabant, Netherlands Registered: Jan 2010 posted 02-01-2014 02:28 PM                     Try reseating all the boards in the card cage. Secondly check all the tamper-switches and close up the entire projector. See if the error message disappears. Might only be visuable after booting up the projector.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-01-2014 03:44 PM                     Where is the sense of a tamper switch/error if there is no explicit reset procedure for it? - Carsten  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 02-01-2014 05:05 PM                     I reset all 3 boards the other day and the projector was completely closed up. Projector has been rebooted many times with no success. It's just weird that I only got this new error AFTER opening the projector up and replacing the board. I must have tripped something. Can you bypass the tamper switches by just cutting and connecting the 2 wires together?  |  IP: Logged Jason Raftery Film Handler Posts: 72 From: San Diego, CA, USA Registered: May 2011 posted 02-01-2014 07:11 PM                     Sorry Richard, I missed the part about getting error 26 now. 26 can be a tough one to catch as there are a lot of potential triggers for it. Stefan is right to start by re-seating the boards in the TI chest and checking the physical tamper switches. Verify the new interface board is on the same firmware versions as the old board. A version mismatch can cause this. You may also want to check voltages on the PJDIV board (be sure to use a meter with sufficiently good accuracy when measuring DC voltage!). For a 800C, the test points and acceptable ranges are as follows: - TP5609: 5.10 + 0.1 [VDC]– 0.0 [VDC] - TP5610: 3.40 ± 0.05 [VDC] - TP5611: 12.00 ± 0.1 [VDC] I have seen interface boards cough up bizarre errors if the 5V rail is even the tiniest bit low. If the voltages are out of tolerance, adjust the trim pots on the GPSU slightly to bring the voltages to the center of the allowable ranges. Also, double check your macros and make sure one isn't calling a file that is not on the new interface board. That would typically trigger an error 120 (DLP Ack Fail) but the service manual suggests it as a troubleshooting step for error 26, as well. Good luck!  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 02-02-2014 10:54 AM                     I had the 120 error with the tamper error when I first installed the card. I was told to save all settings from a good projector and restore to this one. When I did that, it got rid of the 120 Ack error. When I originally put back the old interface card, I still had the new tamper error so I dont think its the card. I did reset all 3 cards.  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 02-02-2014 07:08 PM                     I'll be back at the theater tomorrow. NEC is going to call. We will see. Again, can I bypass the door tamper switches?  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 02-06-2014 12:33 PM                     After locating the MANY door tamper switches, I found one where the screw coming through the door was bent enough to miss the lever on the switch. That's all it was....GRRRRRRRR!!!!!  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 02-11-2014 04:24 PM                     The story doesn't end there. DCP works fine now but Bluray through the DVI is messed up. The picture plays fine for 10 seconds then goes to snow. If I turn off the Bluray and turn it back on, picture plays again for 10 seconds then snow. If I hook up my laptop to DVI with the same cable, it works fine. I tried different Bluray and DVD players. No luck. All the files have been restored from a good projector with the same equipment hooked up to it. NEC is still helping but running out of ideas.  |  IP: Logged Ian Freer Expert Film Handler Posts: 135 From: Wellington, New Zealand Registered: Oct 2003 posted 02-11-2014 11:04 PM                     Snow over HDMI/DVI is often a result of one device not being HDCP compliant isn't it? Could the NEC board responsible for HDCP be giving you trouble?  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 02-12-2014 05:21 AM                     It could be but this only happened after the new interface board was installed. Could there be a compatability problem with the new interface board?  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 02-12-2014 01:53 PM                     Turns out the new board is not compatible with the projector. I put the old bad board back in and Bluray is fine but DCP is no good again. The part numbers were a bit different between the 2 boards and NEC is trying to figure it out.  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 03-05-2014 09:14 PM                     New board finally arrived. Correct part number this time. All works fine now. Go digital.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 03-06-2014 07:17 AM                     Not bad...only took 3 months!  |  IP: Logged

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