Help. FISHER GOLDBUG g2

[Arcoman]

Guys, hello. Such a problem. Cleaned the device rev 3 2010. And broke the u7 chip. Who has a device with this element. Take a photo please. Or tell me the label.

[Carl-NC]

It's a 2-input NOR gate. Probably SN74AHC1G02.

[Arcoman]

Thank you very much. Do you have a photo of this place?

[kt315]

first, photos of your pcb?

[Arcoman]

Why do I need my photo? Mine is broken and there is no this element. I need to look at the label. on this chip. Because I was told that "probably". A photo of this place would be helpful. I have a photo with this chip but the quality is disgusting.

[kt315]

i need your photoS be cause for global archive/base collecting. can you do pics in HR? (5 and more mb size)
i see some pics, but blur Opening the Fisher Gold Bug PRO (repair). In pictures | MD-Hunter Blog
every your pic will work in future for SOS-HELP's folks.

[Arcoman]

i need your photoS be cause for global archive/base collecting. can you do pics in HR? (5 and more mb size)
i see some pics, but blur Opening the Fisher Gold Bug PRO (repair). In pictures | MD-Hunter Blog
every your pic will work in future for SOS-HELP's folks.

I wrote to you on that forum. but they didn't answer. I will make this circuit better without some elements.

[Arcoman]

that's better. because there are a lot of clones. they are all the same. except for the earliest ones, they contain u7). Believe me, I have been looking for the name of this microcircuit for a month now. And most likely found.

[Carl-NC]

Sorry, It's not a NOR gate, it's an XOR gate, SN74AHC1G86. I don't have a photo. U7 was placed on early boards but it is omitted from later boards. It feeds one of the clocks to the micro but even on the early boards that have U7 installed I believe it was not actually used.

[Arcoman]

this thing gives an impulse to the 8th leg pic16f886. This is the "Volume Shadow Copy Service (VSS) is a set of COM-APIs that implements a framework that allows volumes to be backed up while applications on the system continue to write data to the volume". Most likely, this microcircuit is involved in some kind of post-processing of the signal. Since in this device tx and px interact through the TS5A3157DBVR switches, it is possible: fine-tuning the ground or cutting metal

[Arcoman]

We need to find a photo. Then 100%. And so you can damage the device.

[Arcoman]

Where does the information about this chip come from. don't you have a device? and no photo. ?

[Carl-NC]

The VSS pin is power supply ground.

I work for First Texas so I have the schematic. It has an incomplete part number:

[Arcoman]

Wow))). I'm drawing and painting here))) I'm scratching my head))) I'm smart)) atut from Texas itself))) thank you. nice to meet you.

[Arcoman]

maybe another question. my diagram is correct. and you can look at yours with one eye))