[NTLK] eMate 300 Infrared Repair

[Victor Rehorst]

OK, I removed the metal shroud and took some photos.

Under the shroud: 
https://dl3.pushbulletusercontent.com/fad8OYRCdHHGzG35L3QbvOqkkzDagaiH/IMG_20230920_165840.jpg

The IC is a CS8130 IrDA/ASK transceiver with UART host interface: 
https://www.mouser.ca/datasheet/2/76/cs8130_f1-1160092.pdf

The receiving photodiode has the letters KP stamped onto the back.  The 
CS8130 datasheet's example schematics specify a BPV23NF photodiode as a 
receiver, and TSHA5502 as transmitter LEDs.  The photodiode is still a 
currently available part; the TSHA5502 has been replaced by the TSHA5500.

The passives are on the other side of the board, here's a photo of that 
area:

https://dl3.pushbulletusercontent.com/sCToe6cpejitqZIqF7vLlFp8WKd8LchX/IMG_20230920_165737.jpg

Hope that helps!

-V

On 2023-09-19 11:16, David Arnold via NewtonTalk wrote:
> Martin Harding wrote on 17/9/23 20:29:
>
>> I have an eMate 300 with a non-functional Infrared Unit.
>>
>> Do you know if there is a description anywhere showing how to repair 
>> an EMate infrared unit ?
> I don't think I've ever seen details of the IR hardware for any of the 
> MessagePads or eMate.
>
> IIRC, the eMate supported both IrDA and Sharp ASK, unlike the earlier 
> generation MessagePads.   Does anyone have an eMate motherboard handy, 
> and is able to check the IR transceiver markings?
>