it needs two batteries
original type LTC-7PN-S4, but these were out of stock so i used BL-7PN, these are the same except they have two additional cathode pins, these can just be 'peeled' off the end of the case
note that this type of battery can be marked either 3.5V or 3.6, it just depends on the reference conditions used in the specification, don't worry, they're the same really
remove the chainring bolts
remove the small chainring, this reveals the small indents next to each hole
use a small screwdriver, poke it in one of the indents and lever off the cap over the electronics - there are no wires connected to the cap, it can be removed completely
before pic, i've inset a zoomed in view of one of the indents
on each battery terminal, there's a piece of insulating sleeve, carefully slide this down the wires leaving the soldered connection visible
use a small soldering iron to disconnect the battery, take care not to let the wires spring back as they could flick solder into the rest of the electronics, remove the battery, it's held in place by some mildly tacky stuff
repeat for other battery
trim the terminal leads of the replacement batteries to the same length as the originals and tin them, also re-tin the ends of the wires from the srm
solder the terminals of the new battery
once cooled, slide the insulating sleeves up over the joints
gently bend the cathode wire (-ve) towards the axle - otherwise it will foul on the edge of the housing
push the battery back into place
repeat for other battery
if you've got a magnet handy, move it past the two reed switches a few times to wake the srm, it should then be detected by your head unit, you can check the zero offset, it should look like it used to before the old batteries got tired
check that the seals on the cover are in place, line up the white dot so that it's centered on the reed switches and push it back on, the make sure it's fully seated all the way round (if there was *any* sign of water/crud having seeped in, check the seals are ok, put some extra silicone gel on them)
replace chainring, do up chainring bolts to 10Nm
refit to bike, ride
I just replaced the TWO square lithium batteries in my wireless Dura Ace 7800 SRM. For the full instructions I made a nice tutorial at my blog: http://www.thetallcyclist.com/2012/11/s ... made-easy/" onclick="window.open(this.href);return false;
I included a link with where you can get the batteries in Europe.
this week failed to record my SRM power and cadence. Believing be the battery, I decided to follow the tutorial brir and replace battery. However open when checked that the wires that connect the plate abteria were loose. The battery is ok but do not know where to solder the wires in the dve circuit board. Could anyone help me with a photo, or indicating which location? My SRM is an FSA K-Force Light. The problem is not that the second battery that has the grounding screw.
Sorry the bad english!!
I purchased in this configuration as I was going to by compact rings anyway for days in the big mountains and bought the SRM this way as a cost effective way (if you can call it that) of getting the compact chain rings.
98% of the time i will be using the 53/39 and therefore plan on removing the compact rings off the SRM before I even install the SRM and install the standard rings from the DA9000 crank set. After reading the posts in this thread about how the small chain ring seals and keeps the cover in place, is this something I need to be wary of when swapping over the chain rings??? I mean will removing the small chain rings pop the cover (i hope not) or is there something else needed to actually remove the cover?
however, there is enough friction involved so as not to let the cover "pop off" when you remove the rings. Don't worry, changing the rings is just as trivial as changing them on a normal (non SRM) spider.
DartanianX wrote:Does anyone know how to use the new software function to check the levels of the battery crank?
I was told its when you dld a training file from the PC7, I guess its via the SRMwin software, but not sure. This is an awesome feature though.
- Similar Topics
- Last post
- 2 Replies
- 437 Views
Last post by TonyM
Tue Sep 26, 2017 6:39 am
- 7 Replies
- 913 Views
Last post by oldnslow2
Fri Dec 08, 2017 11:59 pm
- 0 Replies
- 323 Views
Last post by nelsontod
Tue Aug 15, 2017 7:21 pm
- 21 Replies
- 1916 Views
Last post by Stickman
Tue Apr 10, 2018 7:30 am
- 6 Replies
- 800 Views
Last post by kode54
Sat Nov 04, 2017 7:43 pm