On 4/22/2010 5:54 AM Arny Krueger spake thus:
"David Nebenzahl" wrote in message
.com
On 4/21/2010 12:58 PM David Nebenzahl spake thus:
On 4/21/2010 12:42 PM Chuck spake thus:
On Wed, 21 Apr 2010 12:18:03 -0700, David Nebenzahl
wrote:
Question is about a Kyocera R-851 receiver, ca. 1985, 85
w./channel. Unit is in fine condition (many capacitators have
been replaced) except for one thing: it doesn't remember
radio stations. Does anyone know enough about this
unit to tell me what the likely culprit is here? Any links to
schematics?
Look for a .47 to 1 Farad capacitor on the front panel.
Used to do warranty service on these and I believe that
is how the back up voltage was stored. Chuck
Thanks for the quick reply.
So by "front panel" you mean the back of the front panel
inside, right? Would that be accessible from the top or
bottom of the unit?
Found it. But it's not a supercap as you said; on the
left side of the front panel there's a 3-volt cell, a
Sanyo marked "LF-1/2W" that says it's a Li-Mn cell (never
heard of that chemistry before). I'm going to the local
electronics store to see if they have a replacement.
Yes, the mention of Lithium Manganese batteries is a bit of a flash from the
past.
A moment of silence for a technology that does not seem to have passed the
test of time.
In many cases your current problem has been circumvented by simply wiring a
2-cell AA battery holder in
parallel with the on-board cells.
would monitor the temperature of the new batteries for aI would monitor the
temperature of the AA celll for a fewessboard cell.
I would monitor the temperature of the alkaline cells
for a few minutes after installtion to ensure that there was no shorting.
This was a commonly-accepted dodge back in the old days of PCs before the CR
2021 cells became the de-facto standard.
Thanks, but I'm not going to sweat any of that.
Rummaging around in my battery collection, I found another similar
3-volt lithium cell. (Like a large hearing aid battery, not an axial
one.) It was good, so I soldered it in place of the old one. The
receiver works fine. I'm letting it sit a couple days without power to
confirm that the memory is being backed up.
--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.
- Comment from an article on Antiwar.com (
http://antiwar.com)