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About Patlover1983

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  • Birthday 05/11/1983

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  1. Looks like the gain potmeter has been dirty or defective. I have seen other K amps with this problem and the only solution was to replace them. My advice: replace them both, so they are both worked fine for a long time. I think also there could be a problem with the ULOL adjustment. If you know what your doing you can do it by yourself. If not, please send the K1 to a Crown service centre.
  2. As far as i know the power supplies are the same for the XTi2k and 4k. But there are several resistors that needs to be replaced. I have tried to do this also, but it's tricky and not effort when you compare the pricings of the 2 amplifiers. For the finishing touch you need also replace the front (for the typenumber). So my advice: if you want more power, sell your XTi2k and buy a XTi4k.
  3. Does the gain knob work fine in stereo mode? I looks like on channel heats up to much. This could be a problem with the standby circuit or the idle adjustment/control of that channel.
  4. In case of a corrupted software and the USB interface isn't initialized, you need to connect the LPC controller to your PC with an RS232 transciever board. You can buy them very cheap on Ebay. At the front of the mainboard you can find 4 connections. Some boards are provided with pin headers, some not. In that case you can remove the mainboard and add pin headers. If you want, you can connect the wires of the RS232 transciever board to these pinheaders. If you are skilled, you can solder the wires directly on the mainboard, but be carefull not touch the electrolityc capacator (the one near the connector) with your soldering tip. The other side (the rs232 side) you can connect to your RS232 port on your computer, or use (just like i do) an USB to RS232 converter. I use a no-name converter with Prolific chipset. When you make the connection, just download the Philips LPC flash tool, called Flash Magic. You need to setup this program first (i do have the settings, if you need i can give it to you). You need to have the HEX file that you can flash into the LPC. You can ask it at the technical department from Crown. If you want i can also send it to you, in that case you can contact me. When you have all the preparations done, you need to connect TP5 with TP17 on the mainboard (these TP connectors are located near the LPC chip on the mainboard). You can connect it with a wire. When you connect it, powerup the amplifier. When it's on, you can remove the connection. Than you can test if you have a connection with the Flash Magic tool, just to read out the digital signature. When you have connection, you can re-flash the HEX file into the LPC (this can take couple of minutes, after flashing the Flash Magic tool verifies if it has flashed correctly). When done, just power down the amp, remove all the connections and fire it up again.
  5. I think the only way to find out what the 'problem serials' are sending an email to Crown Support. If you have a amplifier that shows problems you can remove the cover to see if you have an earlier XTi model. Usually you can see this at the powersupply pins that connects the heatsink to the PCB. Another way is to look at the number/ribbon cable af the front. If it ends with a 4 or 5 you do not have a ampifier with initial bugs. Some mainboards have a sticker near one of the XLR input connectors. It shows the sofware version, also the PWA number so you can find out if the mainboard is one with problems. At the back on the sticker with the serial number there must be a building date, i believe the 'bad one's' are before 2006?
  6. Hello Alain (and others offcourse), i'm back again! After reading your first post, especially the part when you say A + B leds are all light up, it looks to me like a software problem. Maybe the LPC has corrupted software.
  7. I do not know for sure (it has been a long time ago) but i believe some of the diodes that rectifies the logic supply from the SMPS transformer where in short. And blew a PCB trace. After repairing the trace and replace the 4 SMD diodes the amplifier runs like a new one.
  8. I had a CTS600 with similar problems. The problem was a faulty logic power supply.
  9. Hello everyone, Here i'm again! Does anybody have a firmware file (HEX file) for the Crown XTi1002 amplifier? Have one from a friend with defective LPC controller. Hope anybody can help! Thanx!
  10. In the XTi (and offcoure DSI and CDI) 2000, 2002, 4000 and 4002 when experience defective drivers it could also be a fault in the tracker circuitry. When the tracker FETs are short the powertransistors and driver transistors worked all on the highest voltage. Usually the driver that is located between the two heatsinks will fail, so i think it has something to do with the rising temperature of the driver and power transistors and the driver transistor run out of it's SOA limits. I tought this topic was the best place to share my experience and toughts.
  11. I have seen and repaired very much Crown MicroTech amplifiers (started with the first grounded bridge amp, the MicroTech 1000) but i also never seen one with 'supply', it was always ODEP. If you can post a picture, i'm also very curious.
  12. Hello Alain, Thanks (again) for your input. When i disconnect the XLR signal cables or turn the gain controls fully counter clockwise the amp goes into sleep mode on both channels. The enable led dims, and both channels are cooling down. So i think the amp is working fine. BTW: the K2 sounds great!
  13. For a friend of mine i just repaired his Crown K2 amplifier. Both output PWA's and the main PWA had several problems. On the main PWA T1 was defective (short winding), some of the LM361 comparators where faulty and the 4 25v/100uf caps (near T1) where faulty. The output PWA's had several components defective, like the FET driver and the optocouplers Also at one side the isolator sheet had a small hole and the heatsink was short to chassis. Resolve all problems and the amp is worked back again! But both channels are run very very hot when channels are been active. Even without load you burn your hand after one hour. Is this normal? I never had an K serie amplifier on my workbench. When disconnecting audio signal (or simply turn the gain pots at front back) the channels getting inactive and cool down. So this works like it should be. Hope anybody with K2 experience can answer my question.
  14. Last week i recieved the last part (the K2 transformer) so the order is completed now. If you want something good it takes a lot of time :D
  15. Maybe the ribbon cables from the input board to the mainboard? I do'nt know for sure, but are the output devices recieving there supply from the heatsink? And recieve the heatsink supply from the PCB? I remember there where some models with bad connections between PCB and heatsink.