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Assembly of Di2



 
 
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  #11  
Old January 29th 20, 04:53 AM posted to rec.bicycles.tech
jOHN b.
external usenet poster
 
Posts: 2,421
Default Assembly of Di2

On Tue, 28 Jan 2020 22:28:33 -0500, Frank Krygowski
wrote:

On 1/28/2020 8:36 PM, jbeattie wrote:
On Tuesday, January 28, 2020 at 4:59:05 PM UTC-8, Tom Kunich wrote:
On Tuesday, January 28, 2020 at 1:40:42 AM UTC-8, wrote:
On Monday, January 27, 2020 at 1:59:08 AM UTC+1, Tom Kunich wrote:
On Thursday, January 9, 2020 at 9:43:42 AM UTC-8, Tom Kunich wrote:
It occurs to me that I should install the hydraulic brakes before I attach the electronic wiring. What do you think?

Well, I have put the Di2 together. And nothing works. The possible sources of error a

1. The wiring is incorrect. I assumed that the left and right shifters would go into the left and right connector of to two holes of the 5 hole Stem unit. The manual is not clear about this so it was ad lib.

2. The new battery could be flat. I have no way of measuring the voltage under load but the unloaded voltage is 8 volts and Shimano says that 7 something volts is a full charge. I bought a new charger but I don't think it was new since it didn't come in a box or sealed plastic bag and when I questioned the seller he promptly returned my money and said that I could keep the charger. Looking at the output voltage it measures zero but I don't know what the charging circuitry is. It could turn off with no detectable load. Hmmm. So I bought another "new" charger and hopefully this one will work.

So the question is this: Could the battery be so flat that the unit wouldn't turn on?

Possible, but I never came across a new battery out of the box that was so dead that it wasn't able to power a led.

Lou

I find it curious as well. Nut Lithium Ion batteries are odd works. Perhaps plugging it into the battery charger whish isn't working drained the battery. And the high voltage measurement I got was because there was no load on it.

In any case the new charger should arrive Friday and I'll test the charge again.

Otherwise I'll have to replace the stem unit. I have no idea why his stem junction box is a five port unless he was running TT bars with end shifters.


Is this a trick question? If your battery is showing 8v, it's not dead. No? Why would load matter -- except for measuring capacity. I understand the battery may have a protection circuit, but wouldn't that decrease the measured voltage?

I don't have an EE degree, but I measure batteries with a multimeter all the time to see if they are alive or dead, and if one showed 8v it would not be dead. I think you messed something up. Just check the quality of your connections. Do you have the little tool? https://www.youtube.com/watch?v=OkdY9q-u5Dk If you're not fishing wires, it's really pretty fast and easy. Its the fishing that takes time.


Gosh, you guys make Di2 sound wonderful!

Can we work on electronic steering next? What could go wrong?


I believe that electric power assist steering, refereed to as an EPAS
system, is the NEW thing. Honda has recently patented such a system,
and I believe is also offering power steering on their new Neo Wing,
and Alibaba currently sells a hydraulic powered system for Suzuki
motorcycles.

Just think... power shift, power steering and power pedaling and all
you have to do is sit there. Add an adapter for a modern hand phone
and you can easily watch youtube even while riding your bicycle.
Almost like sitting at home and watching the TV.
--
cheers,

John B.

Ads
  #12  
Old January 29th 20, 06:06 AM posted to rec.bicycles.tech
Andre Jute[_2_]
external usenet poster
 
Posts: 10,422
Default Assembly of Di2

On Wednesday, January 29, 2020 at 3:53:06 AM UTC, John B. wrote:
On Tue, 28 Jan 2020 22:28:33 -0500, Frank Krygowski
wrote:

On 1/28/2020 8:36 PM, jbeattie wrote:
On Tuesday, January 28, 2020 at 4:59:05 PM UTC-8, Tom Kunich wrote:
On Tuesday, January 28, 2020 at 1:40:42 AM UTC-8, wrote:
On Monday, January 27, 2020 at 1:59:08 AM UTC+1, Tom Kunich wrote:
On Thursday, January 9, 2020 at 9:43:42 AM UTC-8, Tom Kunich wrote:
It occurs to me that I should install the hydraulic brakes before I attach the electronic wiring. What do you think?

Well, I have put the Di2 together. And nothing works. The possible sources of error a

1. The wiring is incorrect. I assumed that the left and right shifters would go into the left and right connector of to two holes of the 5 hole Stem unit. The manual is not clear about this so it was ad lib.

2. The new battery could be flat. I have no way of measuring the voltage under load but the unloaded voltage is 8 volts and Shimano says that 7 something volts is a full charge. I bought a new charger but I don't think it was new since it didn't come in a box or sealed plastic bag and when I questioned the seller he promptly returned my money and said that I could keep the charger. Looking at the output voltage it measures zero but I don't know what the charging circuitry is. It could turn off with no detectable load. Hmmm. So I bought another "new" charger and hopefully this one will work.

So the question is this: Could the battery be so flat that the unit wouldn't turn on?

Possible, but I never came across a new battery out of the box that was so dead that it wasn't able to power a led.

Lou

I find it curious as well. Nut Lithium Ion batteries are odd works. Perhaps plugging it into the battery charger whish isn't working drained the battery. And the high voltage measurement I got was because there was no load on it.

In any case the new charger should arrive Friday and I'll test the charge again.

Otherwise I'll have to replace the stem unit. I have no idea why his stem junction box is a five port unless he was running TT bars with end shifters.

Is this a trick question? If your battery is showing 8v, it's not dead. No? Why would load matter -- except for measuring capacity. I understand the battery may have a protection circuit, but wouldn't that decrease the measured voltage?

I don't have an EE degree, but I measure batteries with a multimeter all the time to see if they are alive or dead, and if one showed 8v it would not be dead. I think you messed something up. Just check the quality of your connections. Do you have the little tool? https://www.youtube.com/watch?v=OkdY9q-u5Dk If you're not fishing wires, it's really pretty fast and easy. Its the fishing that takes time.


Gosh, you guys make Di2 sound wonderful!

Can we work on electronic steering next? What could go wrong?


I believe that electric power assist steering, refereed to as an EPAS
system, is the NEW thing. Honda has recently patented such a system,
and I believe is also offering power steering on their new Neo Wing,
and Alibaba currently sells a hydraulic powered system for Suzuki
motorcycles.

Just think... power shift, power steering and power pedaling and all
you have to do is sit there. Add an adapter for a modern hand phone
and you can easily watch youtube even while riding your bicycle.
Almost like sitting at home and watching the TV.
--
cheers,

John B.


I thought you were a mechanic, Slow Johnny. What did they say in the Air Force when you left out a critical sub-system from an assembly? Where's the gyroscope to keep the bike upright?

Andre Jute
Oh, I don't mind smartarses in small numbers
  #13  
Old January 29th 20, 08:01 AM posted to rec.bicycles.tech
Tosspot[_3_]
external usenet poster
 
Posts: 1,563
Default Assembly of Di2

On 29/01/2020 02:36, jbeattie wrote:

snip

Is this a trick question? If your battery is showing 8v, it's not
dead. No? Why would load matter -- except for measuring capacity. I
understand the battery may have a protection circuit, but wouldn't
that decrease the measured voltage?

I don't have an EE degree, but I measure batteries with a multimeter
all the time to see if they are alive or dead, and if one showed 8v
it would not be dead. I think you messed something up. Just check
the quality of your connections. Do you have the little tool?
https://www.youtube.com/watch?v=OkdY9q-u5Dk If you're not fishing
wires, it's really pretty fast and easy. Its the fishing that takes
time.


A battery will often show volts but not be able to pwoer anything. You
should measure the voltage in circuit if possible (i.e. under load), or
just check the voltage of an old PP9 you have lying about (smoke
detector battery). If you have a *lot* lying around.

https://www.youtube.com/watch?v=8hwLHdBTQ7s
  #14  
Old January 29th 20, 04:05 PM posted to rec.bicycles.tech
JBeattie
external usenet poster
 
Posts: 5,870
Default Assembly of Di2

On Tuesday, January 28, 2020 at 11:01:22 PM UTC-8, Tosspot wrote:
On 29/01/2020 02:36, jbeattie wrote:

snip

Is this a trick question? If your battery is showing 8v, it's not
dead. No? Why would load matter -- except for measuring capacity. I
understand the battery may have a protection circuit, but wouldn't
that decrease the measured voltage?

I don't have an EE degree, but I measure batteries with a multimeter
all the time to see if they are alive or dead, and if one showed 8v
it would not be dead. I think you messed something up. Just check
the quality of your connections. Do you have the little tool?
https://www.youtube.com/watch?v=OkdY9q-u5Dk If you're not fishing
wires, it's really pretty fast and easy. Its the fishing that takes
time.


A battery will often show volts but not be able to pwoer anything. You
should measure the voltage in circuit if possible (i.e. under load), or
just check the voltage of an old PP9 you have lying about (smoke
detector battery). If you have a *lot* lying around.

https://www.youtube.com/watch?v=8hwLHdBTQ7s


I would think that if the battery is showing full voltage, it would have enough amperage to run an LED at the junction box unless there was something really weird about the protection circuit, but I'll leave that to the electronic gurus. With Tom, it always turns out to be something mundane like a wrong part or a mis-description, like his very unique BB which turned out to be a standard 68mm ISO BB. The project should take an hour or so and not months.

-- Jay Beattie.
  #15  
Old January 29th 20, 08:12 PM posted to rec.bicycles.tech
Tom Kunich[_2_]
external usenet poster
 
Posts: 1,318
Default Assembly of Di2

On Tuesday, January 28, 2020 at 5:16:53 PM UTC-8, AMuzi wrote:
On 1/28/2020 6:59 PM, Tom Kunich wrote:
On Tuesday, January 28, 2020 at 1:40:42 AM UTC-8, wrote:
On Monday, January 27, 2020 at 1:59:08 AM UTC+1, Tom Kunich wrote:
On Thursday, January 9, 2020 at 9:43:42 AM UTC-8, Tom Kunich wrote:
It occurs to me that I should install the hydraulic brakes before I attach the electronic wiring. What do you think?

Well, I have put the Di2 together. And nothing works. The possible sources of error a

1. The wiring is incorrect. I assumed that the left and right shifters would go into the left and right connector of to two holes of the 5 hole Stem unit. The manual is not clear about this so it was ad lib.

2. The new battery could be flat. I have no way of measuring the voltage under load but the unloaded voltage is 8 volts and Shimano says that 7 something volts is a full charge. I bought a new charger but I don't think it was new since it didn't come in a box or sealed plastic bag and when I questioned the seller he promptly returned my money and said that I could keep the charger. Looking at the output voltage it measures zero but I don't know what the charging circuitry is. It could turn off with no detectable load. Hmmm. So I bought another "new" charger and hopefully this one will work.

So the question is this: Could the battery be so flat that the unit wouldn't turn on?

Possible, but I never came across a new battery out of the box that was so dead that it wasn't able to power a led.

Lou


I find it curious as well. Nut Lithium Ion batteries are odd works. Perhaps plugging it into the battery charger whish isn't working drained the battery. And the high voltage measurement I got was because there was no load on it.

In any case the new charger should arrive Friday and I'll test the charge again.

Otherwise I'll have to replace the stem unit. I have no idea why his stem junction box is a five port unless he was running TT bars with end shifters.


Wires? No need to suffer wires:
https://www.bianchi.com/bike/force-etap-axs-12sp/

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


https://www.bing.com/videos/search?q...47&FORM=VI RE
  #16  
Old January 29th 20, 08:17 PM posted to rec.bicycles.tech
Tom Kunich[_2_]
external usenet poster
 
Posts: 1,318
Default Assembly of Di2

On Tuesday, January 28, 2020 at 5:36:21 PM UTC-8, jbeattie wrote:
On Tuesday, January 28, 2020 at 4:59:05 PM UTC-8, Tom Kunich wrote:
On Tuesday, January 28, 2020 at 1:40:42 AM UTC-8, wrote:
On Monday, January 27, 2020 at 1:59:08 AM UTC+1, Tom Kunich wrote:
On Thursday, January 9, 2020 at 9:43:42 AM UTC-8, Tom Kunich wrote:
It occurs to me that I should install the hydraulic brakes before I attach the electronic wiring. What do you think?

Well, I have put the Di2 together. And nothing works. The possible sources of error a

1. The wiring is incorrect. I assumed that the left and right shifters would go into the left and right connector of to two holes of the 5 hole Stem unit. The manual is not clear about this so it was ad lib.

2. The new battery could be flat. I have no way of measuring the voltage under load but the unloaded voltage is 8 volts and Shimano says that 7 something volts is a full charge. I bought a new charger but I don't think it was new since it didn't come in a box or sealed plastic bag and when I questioned the seller he promptly returned my money and said that I could keep the charger. Looking at the output voltage it measures zero but I don't know what the charging circuitry is. It could turn off with no detectable load. Hmmm. So I bought another "new" charger and hopefully this one will work.

So the question is this: Could the battery be so flat that the unit wouldn't turn on?

Possible, but I never came across a new battery out of the box that was so dead that it wasn't able to power a led.

Lou


I find it curious as well. Nut Lithium Ion batteries are odd works. Perhaps plugging it into the battery charger whish isn't working drained the battery. And the high voltage measurement I got was because there was no load on it.

In any case the new charger should arrive Friday and I'll test the charge again.

Otherwise I'll have to replace the stem unit. I have no idea why his stem junction box is a five port unless he was running TT bars with end shifters.


Is this a trick question? If your battery is showing 8v, it's not dead. No? Why would load matter -- except for measuring capacity. I understand the battery may have a protection circuit, but wouldn't that decrease the measured voltage?

I don't have an EE degree, but I measure batteries with a multimeter all the time to see if they are alive or dead, and if one showed 8v it would not be dead. I think you messed something up. Just check the quality of your connections. Do you have the little tool? https://www.youtube.com/watch?v=OkdY9q-u5Dk If you're not fishing wires, it's really pretty fast and easy. Its the fishing that takes time.

-- Jay Beattie.


Jay, stop showing that you don't know anything about engineering. A battery is similar to a capacitor to the extend that load matters to output voltage. Even a small charge on a battery can show "normal" voltage if you are measuring it unloaded.
  #17  
Old January 29th 20, 09:00 PM posted to rec.bicycles.tech
JBeattie
external usenet poster
 
Posts: 5,870
Default Assembly of Di2

On Wednesday, January 29, 2020 at 11:17:16 AM UTC-8, Tom Kunich wrote:
On Tuesday, January 28, 2020 at 5:36:21 PM UTC-8, jbeattie wrote:
On Tuesday, January 28, 2020 at 4:59:05 PM UTC-8, Tom Kunich wrote:
On Tuesday, January 28, 2020 at 1:40:42 AM UTC-8, wrote:
On Monday, January 27, 2020 at 1:59:08 AM UTC+1, Tom Kunich wrote:
On Thursday, January 9, 2020 at 9:43:42 AM UTC-8, Tom Kunich wrote:
It occurs to me that I should install the hydraulic brakes before I attach the electronic wiring. What do you think?

Well, I have put the Di2 together. And nothing works. The possible sources of error a

1. The wiring is incorrect. I assumed that the left and right shifters would go into the left and right connector of to two holes of the 5 hole Stem unit. The manual is not clear about this so it was ad lib.

2. The new battery could be flat. I have no way of measuring the voltage under load but the unloaded voltage is 8 volts and Shimano says that 7 something volts is a full charge. I bought a new charger but I don't think it was new since it didn't come in a box or sealed plastic bag and when I questioned the seller he promptly returned my money and said that I could keep the charger. Looking at the output voltage it measures zero but I don't know what the charging circuitry is. It could turn off with no detectable load. Hmmm. So I bought another "new" charger and hopefully this one will work.

So the question is this: Could the battery be so flat that the unit wouldn't turn on?

Possible, but I never came across a new battery out of the box that was so dead that it wasn't able to power a led.

Lou

I find it curious as well. Nut Lithium Ion batteries are odd works. Perhaps plugging it into the battery charger whish isn't working drained the battery. And the high voltage measurement I got was because there was no load on it.

In any case the new charger should arrive Friday and I'll test the charge again.

Otherwise I'll have to replace the stem unit. I have no idea why his stem junction box is a five port unless he was running TT bars with end shifters.


Is this a trick question? If your battery is showing 8v, it's not dead.. No? Why would load matter -- except for measuring capacity. I understand the battery may have a protection circuit, but wouldn't that decrease the measured voltage?

I don't have an EE degree, but I measure batteries with a multimeter all the time to see if they are alive or dead, and if one showed 8v it would not be dead. I think you messed something up. Just check the quality of your connections. Do you have the little tool? https://www.youtube.com/watch?v=OkdY9q-u5Dk If you're not fishing wires, it's really pretty fast and easy. Its the fishing that takes time.

-- Jay Beattie.


Jay, stop showing that you don't know anything about engineering. A battery is similar to a capacitor to the extend that load matters to output voltage. Even a small charge on a battery can show "normal" voltage if you are measuring it unloaded.


So what is the likelihood that a battery showing 8v will not produce enough current to run a tiny LED? I mean your not cranking a starter motor. I represent these guys and will see what they have to say. https://mobilepowersolutions.com/ Every time you have some problem, it turns out to be some bizarre mistake, as with your bottom bracket measurement, seat tube clamp diameter, etc., etc. This is not rocket science. Di2 is an easy install.

-- Jay Beattie.
  #18  
Old January 29th 20, 09:26 PM posted to rec.bicycles.tech
Tom Kunich[_2_]
external usenet poster
 
Posts: 1,318
Default Assembly of Di2

On Wednesday, January 29, 2020 at 12:00:57 PM UTC-8, jbeattie wrote:
On Wednesday, January 29, 2020 at 11:17:16 AM UTC-8, Tom Kunich wrote:
On Tuesday, January 28, 2020 at 5:36:21 PM UTC-8, jbeattie wrote:
On Tuesday, January 28, 2020 at 4:59:05 PM UTC-8, Tom Kunich wrote:
On Tuesday, January 28, 2020 at 1:40:42 AM UTC-8, wrote:
On Monday, January 27, 2020 at 1:59:08 AM UTC+1, Tom Kunich wrote:
On Thursday, January 9, 2020 at 9:43:42 AM UTC-8, Tom Kunich wrote:
It occurs to me that I should install the hydraulic brakes before I attach the electronic wiring. What do you think?

Well, I have put the Di2 together. And nothing works. The possible sources of error a

1. The wiring is incorrect. I assumed that the left and right shifters would go into the left and right connector of to two holes of the 5 hole Stem unit. The manual is not clear about this so it was ad lib.

2. The new battery could be flat. I have no way of measuring the voltage under load but the unloaded voltage is 8 volts and Shimano says that 7 something volts is a full charge. I bought a new charger but I don't think it was new since it didn't come in a box or sealed plastic bag and when I questioned the seller he promptly returned my money and said that I could keep the charger. Looking at the output voltage it measures zero but I don't know what the charging circuitry is. It could turn off with no detectable load. Hmmm. So I bought another "new" charger and hopefully this one will work.

So the question is this: Could the battery be so flat that the unit wouldn't turn on?

Possible, but I never came across a new battery out of the box that was so dead that it wasn't able to power a led.

Lou

I find it curious as well. Nut Lithium Ion batteries are odd works. Perhaps plugging it into the battery charger whish isn't working drained the battery. And the high voltage measurement I got was because there was no load on it.

In any case the new charger should arrive Friday and I'll test the charge again.

Otherwise I'll have to replace the stem unit. I have no idea why his stem junction box is a five port unless he was running TT bars with end shifters.

Is this a trick question? If your battery is showing 8v, it's not dead. No? Why would load matter -- except for measuring capacity. I understand the battery may have a protection circuit, but wouldn't that decrease the measured voltage?

I don't have an EE degree, but I measure batteries with a multimeter all the time to see if they are alive or dead, and if one showed 8v it would not be dead. I think you messed something up. Just check the quality of your connections. Do you have the little tool? https://www.youtube.com/watch?v=OkdY9q-u5Dk If you're not fishing wires, it's really pretty fast and easy. Its the fishing that takes time.

-- Jay Beattie.


Jay, stop showing that you don't know anything about engineering. A battery is similar to a capacitor to the extend that load matters to output voltage. Even a small charge on a battery can show "normal" voltage if you are measuring it unloaded.


So what is the likelihood that a battery showing 8v will not produce enough current to run a tiny LED? I mean your not cranking a starter motor. I represent these guys and will see what they have to say. https://mobilepowersolutions.com/ Every time you have some problem, it turns out to be some bizarre mistake, as with your bottom bracket measurement, seat tube clamp diameter, etc., etc. This is not rocket science. Di2 is an easy install.

-- Jay Beattie.


Tell us how many Di2 you personally installed? What is bizarre is that you represent some people and hence know electronics engineering. Or that you believe that the only thing inside that stem junction box is an LED.
  #19  
Old January 29th 20, 11:27 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 824
Default Assembly of Di2

On Wednesday, January 29, 2020 at 10:07:02 PM UTC+1, jbeattie wrote:
On Wednesday, January 29, 2020 at 12:26:32 PM UTC-8, Tom Kunich wrote:
On Wednesday, January 29, 2020 at 12:00:57 PM UTC-8, jbeattie wrote:
On Wednesday, January 29, 2020 at 11:17:16 AM UTC-8, Tom Kunich wrote:
On Tuesday, January 28, 2020 at 5:36:21 PM UTC-8, jbeattie wrote:
On Tuesday, January 28, 2020 at 4:59:05 PM UTC-8, Tom Kunich wrote:
On Tuesday, January 28, 2020 at 1:40:42 AM UTC-8, wrote:
On Monday, January 27, 2020 at 1:59:08 AM UTC+1, Tom Kunich wrote:
On Thursday, January 9, 2020 at 9:43:42 AM UTC-8, Tom Kunich wrote:
It occurs to me that I should install the hydraulic brakes before I attach the electronic wiring. What do you think?

Well, I have put the Di2 together. And nothing works. The possible sources of error a

1. The wiring is incorrect. I assumed that the left and right shifters would go into the left and right connector of to two holes of the 5 hole Stem unit. The manual is not clear about this so it was ad lib.

2. The new battery could be flat. I have no way of measuring the voltage under load but the unloaded voltage is 8 volts and Shimano says that 7 something volts is a full charge. I bought a new charger but I don't think it was new since it didn't come in a box or sealed plastic bag and when I questioned the seller he promptly returned my money and said that I could keep the charger. Looking at the output voltage it measures zero but I don't know what the charging circuitry is. It could turn off with no detectable load. Hmmm. So I bought another "new" charger and hopefully this one will work.

So the question is this: Could the battery be so flat that the unit wouldn't turn on?

Possible, but I never came across a new battery out of the box that was so dead that it wasn't able to power a led.

Lou

I find it curious as well. Nut Lithium Ion batteries are odd works. Perhaps plugging it into the battery charger whish isn't working drained the battery. And the high voltage measurement I got was because there was no load on it.

In any case the new charger should arrive Friday and I'll test the charge again.

Otherwise I'll have to replace the stem unit. I have no idea why his stem junction box is a five port unless he was running TT bars with end shifters.

Is this a trick question? If your battery is showing 8v, it's not dead. No? Why would load matter -- except for measuring capacity. I understand the battery may have a protection circuit, but wouldn't that decrease the measured voltage?

I don't have an EE degree, but I measure batteries with a multimeter all the time to see if they are alive or dead, and if one showed 8v it would not be dead. I think you messed something up. Just check the quality of your connections. Do you have the little tool? https://www.youtube.com/watch?v=OkdY9q-u5Dk If you're not fishing wires, it's really pretty fast and easy. Its the fishing that takes time.

-- Jay Beattie.

Jay, stop showing that you don't know anything about engineering. A battery is similar to a capacitor to the extend that load matters to output voltage. Even a small charge on a battery can show "normal" voltage if you are measuring it unloaded.

So what is the likelihood that a battery showing 8v will not produce enough current to run a tiny LED? I mean your not cranking a starter motor.. I represent these guys and will see what they have to say. https://mobilepowersolutions.com/ Every time you have some problem, it turns out to be some bizarre mistake, as with your bottom bracket measurement, seat tube clamp diameter, etc., etc. This is not rocket science. Di2 is an easy install..

-- Jay Beattie.


Tell us how many Di2 you personally installed? What is bizarre is that you represent some people and hence know electronics engineering. Or that you believe that the only thing inside that stem junction box is an LED.


Exactly one. And I confess to breaking the wire to my RD while washing the bike a little too vigorously on my wash stand (dragged the wire into the cassette with a brush). I soldered it back together and used some shrink tube to seal it up. I may put in a replacement wire one day. That shorted the battery, BTW, which has had no problems since. I also confess to needing to read up on programming because I want to change some presets.

You don't need an EE to build a Di2 bike. All you need is YouTube. And I'm sure there is more than an LED in the junction box, but it it is getting power, the LED will blink red at basically any voltage output until it is absolutely dead. I would figure that you would get the blinking red with even a bad battery with some voltage output if it were properly wired. Check all your connections again. Use the tool.

-- Jay Beattie.


You can get the wires in or out by hand just don't push or pull on the wire itself. Make sure you feel it snap in place. Only at places were several wires are close together the tool comes in handy. Everyone who can read a diagram and can put a plug in a socket can put a test setup together in a couple of minutes; just lay all components on the table and connect the wires. I agree with you that the battery has to be really dead not to be able to make the read LED flashing. Is it even possible to order the wrong cables?
These are what you need :
https://www.bike-components.de/en/Sh...or-Di2-p29531/

Lou
  #20  
Old January 29th 20, 11:31 PM posted to rec.bicycles.tech
jOHN b.
external usenet poster
 
Posts: 2,421
Default Assembly of Di2

On Wed, 29 Jan 2020 13:07:35 -0500, Duane
wrote:

On 1/29/2020 10:05 AM, jbeattie wrote:
On Tuesday, January 28, 2020 at 11:01:22 PM UTC-8, Tosspot wrote:
On 29/01/2020 02:36, jbeattie wrote:

snip

Is this a trick question? If your battery is showing 8v, it's not
dead. No? Why would load matter -- except for measuring capacity. I
understand the battery may have a protection circuit, but wouldn't
that decrease the measured voltage?

I don't have an EE degree, but I measure batteries with a multimeter
all the time to see if they are alive or dead, and if one showed 8v
it would not be dead. I think you messed something up. Just check
the quality of your connections. Do you have the little tool?
https://www.youtube.com/watch?v=OkdY9q-u5Dk If you're not fishing
wires, it's really pretty fast and easy. Its the fishing that takes
time.

A battery will often show volts but not be able to pwoer anything. You
should measure the voltage in circuit if possible (i.e. under load), or
just check the voltage of an old PP9 you have lying about (smoke
detector battery). If you have a *lot* lying around.

https://www.youtube.com/watch?v=8hwLHdBTQ7s


I would think that if the battery is showing full voltage, it would have enough amperage to run an LED at the junction box unless there was something really weird about the protection circuit, but I'll leave that to the electronic gurus. With Tom, it always turns out to be something mundane like a wrong part or a mis-description, like his very unique BB which turned out to be a standard 68mm ISO BB. The project should take an hour or so and not months.

-- Jay Beattie.


Irrespective of Tom's abilities, it's not uncommon for a battery to show
voltage without a load and be dead.



True, but it would be extremely unlikely that a battery will show
rated voltage unloaded and zero voltage under a normal load.
--
cheers,

John B.

 




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