Z1000J1/2 dead speedos

[mattc]

Anybody have any old dead Z1000 J1/2 electroniic speedos acting as paperweights they care to part with?

I don't need good case or front glass but need good face/needle and meter internals. To be clear I don't care if the little electronics circuit board is totally burnt out / dead as I have two good ones.

Worst case I can swap a face / needle over from ones I have but would prefer good. By the same token the J1/2 rev counter meter guts is the same and I can use these if there are any dead ones out there.

Probably a fact that if you have a dead unit you cannot easily tell whether the meter is good or the circuit board is dead.....and I could not tell until the unit was stripped down and the parts tested out.

If anyone is interested the meters and circuits on the J1/2 and the GPz1100B digital speedos are the same...apart from plastic mounting changes / face plates and the actual shape and layout of the circuit boards. The rev counters are the same and I believe the Z1000R/1100R and unitrack all have the same rev counter guts and circuit board electronics.

I am also interested if anyone has ever tried to repair the solder connections inside the meters where the insides of the copper damping/return springs connect onto the little pins that take the dc voltage onto the tiny coil that actuates the meter..???

Someone may have done this before but I could not find anything on the forum that goes into it in detail.

For info I have reverse engineered the electronics circuit that goes inside all these meters and it is dead simple with just a bunch of diodes, resistors and capacitors (all readily available) and a Toshiba T2295A chip that "apparantly" you can still buy from the USA....not tried this myself.

http://www.aliexpress.com/item/T2295A-H ... 58361.html

Even the printed circuit board could be made easily enough. I have not found an internal circuit of the chip but it is not doing anything clever...just converting a bunch of pulses into a dc voltage level to move the meter. No microprocessors here (1980 technology) just some kind of boost regulator. From things I have read on the web I think that this chip makes an appearance in other bike mfgs rev counters...

http://xs1100.com/forum/index.php?topic=7926.0

The only diff between speedos and rev counters is the face plate and a few resistor / capacitor value changes to take account on the different type of pules they each receieve.


Like to hear if anyone can help out and/or has made a study of this.

Thanks,

Matt

[paul doran]

I have one

[mattc]

Thanks Paul, Is the speedo you have completely dead or what are it's symptoms...is it still in one piece or have you split it yet?

Matt