Keyboard Shortcuts
Likes
- HP-Agilent-Keysight-Equipment
- Messages
Search
|
Re: 8566B - Low signal on 2-22 GHz band
Follow this sequence:
Right next to the 1st LO OUTPUT connector (front panel) is the IF jumper. Remove the jumper and check it for continuity. The one in the picture on EEVBLOG does not look like the factory original, so maybe someone made a replacement and it's open. Connect your troubleshooting SA to the "IF OUTPUT" SMA connector. Is the 321.4 MHz signal present? If you still have a good 321.4 MHz signal there, reconnect the jumper. Does the IF signal make it through the 1.5 GHz low pass? If it does, and you are sure the cable between A16 LPF and A4 SECOND CONVERTER is good, then the problem is in or around A4 Second Converter. That microcircuit contains a switch. Check the d.c. drive signal to the switch by changing between low band (0-2.5) and high band (2-22). Every time you change bands, the control voltage should do something. If the control voltage is working, and you have a 321.4 signal going into the second converter microcircuit, then I would suspect the switch inside. Vladan |
|
Re: 8566B - Low signal on 2-22 GHz band
Hi Pete, you can check: if there is IF out (321.4MHz) from 1.5GHz LPF A6A16 and from ACLU A6A5 to LPF (jumper A6W22). if there is YTX A6A8 drive from current driver A6A7 if there is resistance on YTX coil if there is diode bias to YTX from A6A10 Be careful as YTX diode is very sensitive to static discharge. 73s Konstantinos
Στι? Τετ?ρτη 26 Ιουν?ου 2024 στι? 01:13:54 π.μ. EEST, ο χρ?στη? W4PJB <petebibbyjr@...> ?γραψε:
Thanks everyone, I tried running the Preselector Peak Routine, no success. Also, just for kicks, I swapped out the YIG with a supposed "tested good" unit. Also, no change, although I didn't expect this to be the issue.? The SA works perfectly on the low band. There are no errors such as YTO unlock, PL1/PL2, REF Unlock (except when the Oven light is on), M/N unlock, HET unlock, etc. It simply gets a very, very weak signal on the high band. Like -94 dB weak. So it's something in this path for sure. My signal generator only goes to 6 GHz, but now that I think of it, I have an Anritsu SA with TG that goes to 7.1 GHz. Perhaps I can try injecting a 7 GHz signal with the Anritsu to see if it works on the next band up.? I tested the RF switch with another SA with TG to 7 GHz, there is no attenuation in the switch on either band. I should also add, I did put another SA on the "1ST LO OUTPUT", set a really narrow sweep span on the 8566B (might have been 0), set attenuation to "0", and was able to measure my input signal (3 GHz) + the 321.4 MHz signal, at full strength from the LO OUT. So we've got? great signal at least to there.? |
|
Re: 8566B - Low signal on 2-22 GHz band
Thanks everyone, I tried running the Preselector Peak Routine, no success. Also, just for kicks, I swapped out the YIG with a supposed "tested good" unit. Also, no change, although I didn't expect this to be the issue.? The SA works perfectly on the low band. There are no errors such as YTO unlock, PL1/PL2, REF Unlock (except when the Oven light is on), M/N unlock, HET unlock, etc. It simply gets a very, very weak signal on the high band. Like -94 dB weak. So it's something in this path for sure. My signal generator only goes to 6 GHz, but now that I think of it, I have an Anritsu SA with TG that goes to 7.1 GHz. Perhaps I can try injecting a 7 GHz signal with the Anritsu to see if it works on the next band up.? I tested the RF switch with another SA with TG to 7 GHz, there is no attenuation in the switch on either band. I should also add, I did put another SA on the "1ST LO OUTPUT", set a really narrow sweep span on the 8566B (might have been 0), set attenuation to "0", and was able to measure my input signal (3 GHz) + the 321.4 MHz signal, at full strength from the LO OUT. So we've got? great signal at least to there.? |
|
Re: k&s 1470 Wire bonding reconstruction
Hello Massimo,
toggle quoted message
Show quoted text
Thanks for the tip with the patents! As for the heater I already have some left over power resistors so I can build something similar to yours. I will most probably come to you with more questions regarding the wire bonding machine. 73! Razvan On 25/06/2024 22:09, iv3hed via groups.io wrote:
Razvan, to get an idea of the components of the machine try looking up |
|
Re: k&s 1470 Wire bonding reconstruction
Razvan, to get an idea of the components of the machine try looking up the patent for that bonding model.
I did the same thing for the 1470 and found these two patents: US4202482 US4239144 I suggest you try looking them up at this site: As for the heater, you can build it yourself with a power resistor. In my heater I used a 50W resistor to get maximum 150 °C . I attach some photos to give you some ideas. Regards, Massimo |
|
Re: HP 8566B - Can my high voltage transformer be faulty?
开云体育Saevar, ? I used to troubleshoot Solid State CRT power supplies. Replace the fuse and any shorted components that drive the HV transformer. Use a variable power supply and bring up the voltage slowly to the HV output semiconductor. Monitor the output waveform of the semiconductor(usually the collector) with an oscilloscope (max range setting). ?The waveform should have *no* small spikes or otherwise called ringing observed in between the higher amplitude ones. If you have ringing I would suspect the transformer as having shorted turns. With a bad transformer, as the voltage increases the unwanted spikes continue to grow. This condition usually causes the final semiconductor to fail(short) and then blow the fuse. ? Some HV output sections have a damper diode in this area that also fails. ? I don’t have the schematic in front of me but you can use this for a general approach. ? ? If this test appears to look fine, then possibly on the output of the transformer you will find a HV Tripler circuit that could be faulty. The Tripler semiconductor device could be self-contained or an arrangement of HV diodes. As the name implies the Tripler multiplies the DC voltage that connects to the CRT. Having a high voltage probe is the key to measuring the anode voltage on the CRT. ? Dave ?
|
|
HP 8566B - Can my high voltage transformer be faulty?
I have a HP 8566B as the title implies. The CRT tube does not turn on and I believe I have traced (at least one) fault to A1A3 high voltage regulator board. The HV oscillator does not oscillate and it just blows the 1A fuse. The Q7 bjt's collector is connected to the high voltage transformer making up the inductor part of the oscillator. The base is also connected to the transformer in a feedback configuration.
The display worked for the first 30 minutes or so of operation after I bought it and then when I inserted low (-10dBm) power at the input the display suddenly turned off, no smoke, no smell but the fuse on A1A6 was blown. Have you had a high voltage transformer be damaged or do you have any good idea how I can verify whether it is working or not? I can't see any induction values nor turn ratio of the transformer in the troubleshooting manual so I don't know what are normal values. |
|
Re: HP 8340B sweeper and 8757A Scalar Network Analyzer. Do they work together?
开云体育My pleasure, Marco! Let me know if I can provide any other information!Steve On Jun 25, 2024, at 10:01?AM, Marco Marchesi via groups.io <marco.marchesi@...> wrote:
|
|
Re: HP 8405A Vector Voltmeter Probes
Hi Jeremy and group,
any updates on the HP8405A probe repair ? I've bought now a bunch of MMBFJ176 from Mouser and found a source for the 5082-2835 diode here in Europe. In browsing thru Avago Schottky diode data sheets, I found an interesting pair of common anode (HSMS-2823) and cathode (HSMS-2824) double diodes. From the data sheet their electrical characteristics look identical to the single 282Z you tested. Maybe they could make an equivalent circuit to the 4 separate diodes of the HP8405A sampler. What do you think ? From the HSMS-282x series there is also a bridge and a ring quad (-P & -R) with identical (?!?) pin-out. But they have "wrong" orientation compared to the HP8405A sampler. Any other suggestions ? Regards?????? Andreas |
|
Re: HP 8340B sweeper and 8757A Scalar Network Analyzer. Do they work together?
toggle quoted message
Show quoted text
On Jun 25, 2024, at 7:34?AM, Marco Marchesi via groups.io <marco.marchesi@...> wrote:
|
|
Re: Frequency References
In message <[email protected]>, maxwelloau
<maxwelloau@...> writes Just use a Leo Bodnar precise reference locked to GPS into a FA-3 Yes second that, good units:)... -- Tony Sayer |
|
Re: HP 8340B sweeper and 8757A Scalar Network Analyzer. Do they work together?
开云体育Hi Marco,I have an 8757A with 8340B as the source and it works perfectly! Best regards, Steve WB0DBS On Jun 25, 2024, at 6:35?AM, Marco Marchesi via groups.io <marco.marchesi@...> wrote:
|
|
Re: k&s 1470 Wire bonding reconstruction
开云体育It might be worth reaching out to Iban, EB3FRN, as he has my retired K&S 4526 which had the heated stage and manual. He has it setup and running-was considering adapting to deep access. You could also try contacting Inseto in the UK as I have bought spares from them. Expect commercial pricing! 73 Lehane G8KMH -------- Original message -------- From: iv3hed@... Date: 21/06/2024 17:39 (GMT+01:00) Subject: [HP-Agilent-Keysight-equipment] k&s 1470 Wire bonding reconstruction A couple of months ago I bought a k&s 1470 wire bonding head to build my own on budget bonding machine for repair the famous HP yig oscillators. I have finished reconstructing the mechanical parts of the bonding, but to start making the electrical part I need the service manual of the head. I don't know if this is the correct group, but i hope sameone can help me find the service manual to finish this "big" project. Best regards, Massimo |
|
HP 8340B sweeper and 8757A Scalar Network Analyzer. Do they work together?
Hi All,?
I have a Sweeper 8350B and a Scalar Network Analyzer 8757A in my lab. The two are connected like that: - 1 HP-IB cable between ?''8757 System Interface'' socket on 8757A side and ''HPIB'' socket on 8350B side - three BNC patches. Everything works fine.? Well, I could make a deal for an HP 8340B but I wonder whether I can still use my 8757A with this sweeper. The available documentation, IMO, is kind of obscure. Does anyone have experience about? Thank you ? |
