Is there any reason why high voltage high resistance resistor use weird marking and value on it? Standard nomenclature, EIA value not used?
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These appear to be Canon's internal part numbers.
https://www.mercateo.com/p/3194-FH9(...000_Canon.html (RESISTOR, 100MOHM, 1W - FH9-0367-000 - Canon)
https://www.mercateo.com/kw/fh4(2d)9169/fh4_9169.html (RESISTOR, 44MOHM, 0.091W - FH4-9169-000 - Canon)
https://marjorie.free.fr/Parts%20cat...clc1100-pc.pdf (FH4-9178-000, RESISTOR, 30MOHM, 0.13W -- page 257 of Canon Laser Copier service manual) -
Thank you for link! This is nice example how to part serial number leed to usefull info.
This was indeed be a copy machine, and I imagine that in uncommon parts is used some other standard, but not know why... only logical explanation is that are not produced for separate sell... confusing others.Comment
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I am curious if a 0402 resistor could go from 43 ohm to 0. In electronics class and my experience a resistor can degrade and gain resistance all the way up to not being able to conduct at all. I have never heard of a resistor decreasing in resistance and becoming 0 ohm or a dead short… that's not the direction they fail… or so I thought.
I was attempting to remove a wson8 chip on an iMac motherboard and it required a lot of heat, on one side of the chip were 3 0402 resistors that were very close. I popped the chip out unintentionally out of the tweezers and sent those resistors... -
Hi, this is more of a project help request than a troubleshooting question. I hope I can post it here.
I have a W-King D8 Bluetooth boom box which I'd like to modify with some external speaker output jacks and some buttons to switch the internal speakers on and off.
From factory the specs of the boom box are:
-Power Input: DC 5V
-Speaker Output Power: 2 x 25W ( confirmed by Youtube channel Hartdegen review as 12.5W RMS per channel)
-Drivers:
-2 x Woofer, 70mm, 10Ω, 70mm,15W
-2 X Tweeter, 8Ω, 30mm,10W x 2
-Frequency... -
Laptop name Acer Aspire E5-574G. Processor = i7-6500u. GPU = NVIDIA GEFORCE 940M. Motherboard Model = DA0ZRWMB6G0
This laptop was not powering on at all so I started investigating. The blue light would come on for a second, and then disappear. Fan would sometimes turn on for a second and then shut off immediately, and at other times would not turn on at all.
To start with, about 3 months ago I had no clue about soldering, motherboard schematics, board view, and then I stumbled about this forum and other stuff online. I have never done any of those before. But to ask... -
Greetings to all, I hope you are well.
I consult you because I have a problem with this power source.
The TV when it is connected to the electrical power turns on the blue light but does not give an image. the source is heard a hum.
When I disconnect the power from the TV plates and power it up by itself, the hum goes away.
I have the STB voltages of 5vdc. The microcontroller is powered with said voltage and the main board LED lights up.
but not the 12v or 17v ones, nor the 300vdc high voltage voltages, nor the VS or VA....06-20-2023, 04:30 AM -
I got a High Power HP1-J600GD-F12S on the bench today that was killed by roaches judging by the dead roaches and large brown spots in the housing next to said roaches.
I was able to identify all the blown smd resistors on the board aside from the one located at R69. I wasn't able to figure out what any of the marking on the resistor was supposed to be and with how little of the marking was left I wasn't able to really make any guesses about what it could be from the surrounding components. It is connected to pin 1 of Q11 (4N65SFA1K) which looks like it is the gate .In the sample...
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