Almost Dead HP-81

[Dave Frederickson]

(03-10-2016 01:03 AM)fxsuarezc Wrote:  

(03-10-2016 12:30 AM)Dave Frederickson Wrote:  Correct. The "1127" chip is an 1820-1127 clock driver. At least that's what it looks like from the schematic. The HP-46 and 81 Service Manual is on the Museum flash drive.

Thanks!!
I bought the CD11 and CD23 and this schematic was not there.
I will check the signals again.
If this chip IS bad, where can i get it?

Thanks again!

Francisco Suárez.

Hi Francisco,

The Repair Manual is on CD24, just to make sure. The clock chip is mentioned on Eric's site, https://www.brouhaha.com/~eric/hpcalc/chips/. You might be able to find a replacement part by salvaging an HP-35, 46, or 80. Also, I've purchased spare parts from Sphere, but they don't have this one.

The HP-80 in the above link is being sold by a Forum Member, so you can try asking for a MoHPC discount.

Good Luck,
Dave