HP-41CX Missing Clock

[rocket.scientist]

So I have been working on restoring a HP-41CX fullnut of unknown heritage. After a few repairs I did get it to power on, "MEMORY LOST", and then power cycle to what looked like normal operation. CAT 2 shows the usual complement of ROMS for a CX. Here is the weird part. The clock appears to be inoperative. I can do a SETIME to whatever, and TIME always returns 12:00:00. Executing CLOCK or Shift->ON results in a blank display.

I suspect either there is a ROM issue or a problem with the clock circuit itself. Doing some research, it appears the clock circuit consists of R4 (at 22MOhm) and Y2 (marked 0410-1381). I am replacing both of these, but I cannot find the specs of the 0410-1381. I am assuming it is a 32.768KHz jelly bean crystal, but who knows.

Does anyone have insight into this part? I am also curious if anyone else has run into the CLOCK blank display thing before. It sounds quite a bit like this post from 2006:

https://www.hpmuseum.org/cgi-sys/cgiwrap...read=85135

Thanks for any advice.

-Pat (KG5YPQ)