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8563EC LCD problem
I was given one of these spectrum analysers presumably because the owner didn't think it could or was worth getting fixed. After fixing the power supply, which was a fault caused by two small electrolytics developing a high ESR, the unit powered on and all voltages were as specified.
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But now I am confronted by a LCD display problem that I can't find a way to progress. Hopefully someone has seen a similar issue and can point me to a solution. Connecting external VGA monitors did not produce any type of display. The best I got was a monitor saying the mode was unsupported.
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Trying to pull the 8563EC apart to access the LCD itself has proved difficult. I suspect some thread lock glue has been used.
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Re: HP8595E - SYTF
Ed,? great idea !? adri Il Mar 1 Ott 2024, 22:08 ed breya via <eb=[email protected]> ha scritto:
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Re: OT: a tale of two chargers.
Never trust a geek, unless you have live chickens to behead! Tell these morons that the supplies are regulated voltage, not current. Then find a Nwrd who understands Electronics. It seems like all those ormer Radi Shack sales drones went to work as Geeks. You have questions? We gon't know the answers! The last time I was at a BB, the 'clerk' informed me that Windows 95 was the first version. I sighed and told him it started with V 1.0, and was just a menu system. He wasn't able to search google properly and isitd I was talking about V 10. I' highly alergic to stupid, so I never went back. Tere was a two way radio shop in Taveres, Florida. The owner had a 386 based computer o program business radios. BB had 'fixed it' It stil didn't work rightt, so I opened it up. They had installed hree IDE controllers, and adn't disabled the onboard port so it was very slow and corupted the software. I pulled the extra cards, and replaced the 40 pin cable? wich was the original problem. They shouldn't be allowed near any computer, except their own. IOIf there are typos, I cant see the screen well enough to find them. On Mon, Sep 30, 2024 at 7:11?PM Harvey White via <madyn=[email protected]> wrote: This is a OT, but I thought I'd bring it up for comments: |
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Re: 8350A RPG 5060-9444 questions
¿ªÔÆÌåÓý? Here is the detail of a repair done in 2022, of an RPG in my 8350B. Maybe it can be useful to you. ? Yves ------------------ ? Hi, just a story about HP/Agilent 5060-9444 5 VDC Rotary Pulse Generator RPG +, replace LAMP by LED. ? ? I had the opportunity to get an 8350B with an 83595A (0.01-26.5GHz). This device had to be stored for a few years. In short, I had to partially disassemble it to remove dust and some traces of corrosion. I changed the battery of course and fixed several problems like the front panel which was partially working. I had to do a complete alignment, now everything is OK. The 83595A seemed to be in better shape, but the RPG was not working. I removed it from the module and opened it up...after examining the circuit, it was easy to see that the lamp was burned out. I studied the module and how it worked, so I tried a repair by replacing the lamp with an LED. ? I found that this little module was quite ingenious. All the parts are on the top of the PCB and underneath 2 photo detectors in a dark room, where there are two plastic sheets in the shape of a circle, a hole followed by another one on top translucent. A small metal piece bent at 45 degrees, serves as a support for the lamp but also as a reflector to direct the light through two tunnels to the photo detectors. The two tunnels have screws allowing them to partially obstruct the light, allowing the two circuits to be balanced. If the light intensity is sufficient, this will trigger the gate 7413 (Schmitt Trigger). When the light levels are balanced by the screws, the duration of the pulses, for a constant speed, should be approximately the same. ? Using an LED recovered from a defective LED bulb, which was the perfect size to fit and fill the rectangular area where the bulb was located, I was able to determine the LED current for minimum operation of the RPG. The currents were 7mA for one side, and 11 mA for the other. I tested up to 30 mA for proper operation. I reduced it to 20mA, found the resistance needed for this current in the LED at 5V. The LED dropped 2.721V. I balanced the circuit with the screws and closed everything. Now the RPG of my 83595A works correctly. I will just have to make the necessary alignments for optimal operation. ? ? -Yves ? ? De?: [email protected] <[email protected]> De la part de bumbo.chinelo@... ? Hello ? After fixing the power supply and multiple Bob West springs (how I hate them) all I have to do (haha optimism) is getting two RPGs to work. Both had the lamp burnt out, but after long searches on Taobao I managed to find almost identical ones; however nothing comes out of the 7413. I removed both transistors and they don't seem too bad; havn't tested yet the 7413 ? Here are some questions for the experts ? 1) the two torx next to the lamp regulate amount light that reaches the photo diodes? I've tried to adjust them but the amplitudes are quite different (see attached photo) ? 2) the two transistors are marked 4-071M 041 (M is Motorola logo) . Can 2N2222 be a replacement since they don't appear in any list of HP components ? 3) What could be a replacement for the photo diodes? ? Thank in advance for any suggestions ? ? ? ? |
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8350A RPG 5060-9444 questions
Hello
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After fixing the power supply and multiple Bob West springs (how I hate them) all I have to do (haha optimism) is getting two RPGs to work. Both had the lamp burnt out, but after long searches on Taobao I managed to find almost identical ones; however nothing comes out of the 7413. I removed both transistors and they don't seem too bad; havn't tested yet the 7413
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Here are some questions for the experts
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1) the two torx next to the lamp regulate amount light that reaches the photo diodes? I've tried to adjust them but the amplitudes are quite different (see attached photo)
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2) the two transistors are marked 4-071M 041 (M is Motorola logo) . Can 2N2222 be a replacement since they don't appear in any list of HP components
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3) What could be a replacement for the photo diodes?
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Thank in advance for any suggestions
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