开云体育

Other information; If I cycle the power just after the message , the CRT shows a message of error 223 as you can see on the picture. The only way to work normally its wait 10 or 15 minutes before

Hi friends My HP8921A show the message of firmware erro after few minutes powered on. Then , if I cycle the power and the instrument doesnt back to work imediatelly . The only way is to wait for 10

Thank you Ralph.

Magnus, I just pulled it out. IT IS OPEN! I will replace it now. Yes, I was not getting any PWM, so I was thinking it wasn't oscillating. I will let you know. Many thanks so far! Thank you! Bill Bill

Thank you very much! I will check. I am here in Wall twp, NJ. I decided tonight to take a break. I know about the high voltage. Thankyou! I just noticed the email or I would have replied much sooner.

I had a similar issue with my 8920B. In my case it was a resistor that went open circuit, without any sign of burns or high temperature. Unfortunately I cant remember where i found the information

The little green LED is for the supply that keeps the OCXO warmed up and ready for use. The instrument won't come on if that supply goes. Check to see if it is on. If it isn't, you will have to remove

Most likely it is the capacitors in the power supply.? I am not sure about the 8920 but the 8924 which is similar has a green led that is seen from the back near the AC power input that stays on when

The 8920b won't turn on. No smell, no back fuses. Nothing warm seen with my FLIR IR VIEWER. Was working the evening before. Any ideas? This is typical.? I measured 1.4Megohms across the AC SUPPLY

Google translate does a really nice job translating this webpage to English.? Not necessary to have an expert in the family.? ?:)

Lucky for me - my wife speaks Portuguese.? She's from Rio. So, the one with the LM1881 IC needs no adjustment. I'll try that one, maybe both as a comparison. I already have the LM393. I'll post my

This is the one I used. Use the circuit from fig 1 of the LM1881 data sheet http://www.ti.com/lit/ds/symlink/lm1881.pdf connect the?LM1881 video input (0.1uF to pin 2)?in parallel with the 8200

I think this could help you. https://tabajara-labs.blogspot.com/2021/03/finalmente-eu-consegui-lcd-no-e8285a.html Miguel 73 de PY3MM

To use the GBS-8200 converter with the hp-8924c service monitor. Obtain: LM1881N IC sync separator .1 UF capacitor--2 required 680 K? ohm resistor To be mounted on the GBS8200 board will be 4 SMD 50

Look at the lm1881 datasheet. A lm1881, a capacitor and a resistor and you are set.

if you just search this message board you will find it There are a couple of different versions? ...the one based on the LM1881 seems to be the easiest the one suing the LM393 may be the cheapest

Hi, Have a look on the British Amateur Television Club website batc.org.uk where you might find something suitable in a back-issue of the CQ-TV magazine, or alternatively search on the forum. Happy

Several years ago I sent the CGA to VGA converter and other parts to a guy who said he would build it for me. I never heard from him again. Now, I have some good reasons to get the screen on a big

Hi Robert SAFT makes 3.0V lithium cells, can be had with wire ends to overcome any mounting problems. George G6HIG Dover UK

I agree with BIll M with one exception. The "battery" is a Lithium Primary Cell. It is a slightly odd chemistry, Panasonic BR2/3A 3.0V. They can be hard to find. More common 3.6V cells will work fine