Fwd: [Kenwood] TS-850 Battery Replacement

[Phil Florig]

Hi all,

I replaced my batteries about a year ago and opted to replace with the orig.
Just sending the e-mail to let the group know about the orig battery number.

Got from Allied as follows:

Allied number is 774-0087 and the battery number is CR2430-FT1 (the FT1 
gives the
same welded tabs for direct replacement.)   Sanyo brand and think cost was 
about $2 ea.

Just for info guys and no connection with Allied except vendor to our company.

Would like to thank all on the reflector for all their input over the years 
as has
been very helpful to a lot of people.  I just want to give back a little as 
I can.

73    Phil  W9IXX


>Having purchased a used TS-850SAT last year and reading many posts about 
>the rig, I decided to replace the memory back-up battery in my 12- or 
>14-year-old TS-850SAT (its age depending on which formula you use). The 
>battery hadn't leaked, but I wasn't going to wait until something went 
>awry and I wound up with more than a battery replacement on my hands. I 
>suspect the battery might have been running low because I noticed that it 
>took several seconds before the display would come to life after the 
>transceiver had been unused for a few days; this may or may not be true.
>
>I basically followed the instructions given by Bill Smith, KO4NR 
>(see  http://www.jzap.com/n6tr/850repair.html). At first I thought I was 
>lucky: It appeared that the battery in my TS-850SAT was in a coin-cell 
>holder! Indeed it was, but unfortunately the holder is spot-welded to the 
>battery, so the holder/battery combination must be unsoldered from the 
>digital PC board (X46-3080). G-r-r-r-r!
>
>Much to my dismay, I discovered that RadioShack no longer stocks any 
>coin-cell holders and I couldn't locate them anywhere locally. Although 
>Newark stocks CR-2430 and CR-2032 holders and batteries, I decided I 
>didn't want to pay $5 for not meeting Newark's minimum order requirement 
>($25). Besides, from what I could see of the pictures of the Keystone 
>holders, I wasn't sure the CR-2430 holder would exactly match the holes in 
>the PC board. Then I got a tip from a guy at a local RadioShack service 
>center. He suggested I try to find an old computer motherboard and 
>scrounge the holder from it. Most motherboards (if not all) use CR-2032 
>coin cells in holders for CMOS memory backup. My first call to a local 
>computer store netted me a pair of old motherboards from which I took the 
>batteries and holders.
>
>After removing the coin cell/holder from the computer motherboard, I 
>attached a pair of color-coded wires (cut from ribbon cable) to the 
>now-empty holes on the TS-850's digital circuit board. I suggest you use 
>color-coded wires to ensure you wind up with the correct polarity: The 
>battery's negative pin is at the top and the two positive pins are near 
>the middle of the board; both positive-pin holes are connected by a 
>PC-board trace.
>
>I secured the scrounged CR-2032 holder to a small piece of perfboard 
>(roughly 2x2 inches) using hot-melt glue and connected the free ends of 
>the wires from the TS-850 battery location to the holder pins; again, 
>ensure proper polarity. Using double-stick pads I attached the perfboard 
>to the left-hand face of the left wall separating the fan/final assembly 
>and RF unit (X44-3120), placing the perfboard within the RF-unit 
>compartment. In this position there's easy access to the battery-holder 
>clip and it's simple to pop out the old battery and insert a new one.
>
>During disassembly of the front panel and digital PC board, I was able to 
>access the bottom of the board after removing only three cables: one above 
>the battery and two near the upper-left of the board. But after I 
>reattached the board and front panel, some of the front-panel key 
>functions didn't work. Anxious? Scared I'd done something wrong? You bet! 
>But I discovered the problem to be a disconnected cable near the bottom of 
>the front panel. This short, flat multiconductor cable interconnects the 
>front panel and the digital PC board and is located (as viewed from the 
>top of the transceiver) below and to the left of the VFO knob. So be 
>careful when moving/positioning the front panel. Having another inch or 
>two of cable there would've been nice (as would an easily removable memory 
>back-up battery).
>
>Nevertheless, the TS-850's a fine rig. Imagine how large it would have to 
>be if it were built when only vacuum tubes were available! My first rig, a 
>Heathkit DX-40 -- without the companion VF-1 VFO -- was half the size of 
>the TS-850 and ran only CW and grid-modulated AM!  My Hallicrafters SX-101 
>receiver alone was easily the size of the TS-850 and weighed in at about 
>75 pounds.
>
>Paul / N1FB
>

-----------------------------------------------
Philip Florig           e-mail:pflorig@ieee.org
115 Horne Rd.               (or):W9IXX@arrl.net
Columbus, NC. 28722         amateur radio:W9IXX
USA               also:J3X-T30,31,32,33P-VP2MPF 

                      team member:AH1A-J3A-VP2MX
                                     MARS:AAR4XX
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