Question about HP ProCurve 2900 48G Switch (J9050A#ABA) Transceiver

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Kenwood TS 2000X: Low TX output on all HF bands ONLY. Symptoms include: No ALC metering. No SWR metering. No TX output power metering. Internal ATU beeps out high SWR in morse once AT button pressed - even under known working 50 ohm dummy load. Please note: THIS IS NOT CAUSED BY HIGH SWR IMPEDANCE MISMATCH!!! Monitoring receiver does reveal that TS 2000X is outputting RF but at an extremely low power. Setting the TS 2000X power level to max (100W) does give 2 bar graph indication on the power meter with only 3cm vertical deflection on x1 probe setting on oscilloscope at antenna connector under 50 ohm dummy load? Again, no ALC/SWR meter readings? PSU shows current drain of only 6.8A @ 13.8Vdc on all or any power setting (5W - 100W). Brand new finals, driver and pre-driver transistors installed - in an attempt to solve the problem - but transceiver still showing problem? All gate bias/drain supply of TX PA PCB measured correcly. But, oscilloscope measurements of the HF drive input at CN14 on power amplifier PCB very low in amplitude (Cannot measure anything in amplitude here)? Can anybody HELP - Many Thanks!

Posted by Anonymous on

6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: HP ppp009 laptop power supply

The best way is to get one off ebay by part number. Take it apart and write them down. Then order the resistors and you will have 2. Then you can either sell the other one back or keep it. You cant lose if you have electronics skills.

Posted on Jan 07, 2008

  • 70 Answers

SOURCE: Getting a new psu

I'm not sure about the size, but this may be what you are looking for:

http://www.ocztechnology.com/products/power_management/ocz_700w_stealthxstream_power_supply

Most power supplies are a standard size, but I'm not sure about your model of HP. The from the photos on the HP site, it looks like a standard mid-tower case and it should fit.

Posted on Feb 05, 2009

  • 101 Answers

SOURCE: Had to use it over the weekend, had coffee maker,

Wow, your meter showed that you had 120v to each of your outlets as it was running? And when you would plug in one of your appliances, they wouldn't work? Mmm, something's not right here...:). Not sure if this problem has been resolved yet (just looking at the date), but I would start from scratch again. Turn everything off (breakers, etc). Start the generator again. Then turn your breakers on ONE at a time. Use your meter to check out each receptacle. Do this on EACH one. If everything checks out okay, then turn on ONE plug at a time again, check with meter again, and then use a low amperage appliance to plug in - and see if it works. Yes, it sounds tedious - but we're doing the process of elimination to really rule a lot out. Unfortunately, coffee maker's (because of their heating element) draw a majority of the load, so having this on the same circuit with other component's can affect things also. If you've repaired this already, great! If you had a minute, I'd be interested in hearing what the problem was. And if you haven't fixed it yet, feel free to contact me again - and I'll help you through with this. Best of Luck to you! - Jim 

Posted on Mar 29, 2010

  • 75 Answers

SOURCE: HP 1220C power light comes on and then goes off

SOUNDS LIKE THE BOARD IS FAULTY.UNPLUG THE PURGE UNIT AND TURN THE PRINTER ON IF IT COMES ON AS NORMAL THAT MEANS THE DRIVER IC ON THE BOARD IS FAULY.IN WHICH CASE YOU WOULD HAVE TO REPLACE THE MAIN BOARD.

Posted on May 10, 2010

mishrajk21
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SOURCE: I'm gettin a pale blue vertical band printed in th...

the drum of blue tooner marks scratche on it replace the tooner with new one ur problem will resolved

Posted on Jul 17, 2010

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Hello, this problem is solved and how?
I have the same problem on HF and VHF 30Watt max output

1.8 MHz-20M 0-5Watt
10M 25 Watt
6M-30Watt

2M-25Watt

70cm 42Watt is ok
23cm 10Watt is ok

thanks

Tuxon7@gmail.com

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