Wildgoose Chase Moto Guzzi

General Category => General Discussion => Topic started by: Trogladyte on August 04, 2017, 01:47:19 PM

Title: Griso dash issue
Post by: Trogladyte on August 04, 2017, 01:47:19 PM
I've had the battery disconnected to change the shock. Now I cant set the time. In the mode position I am getting a blank screen. Sure I've heard of this before. Any ideas?
Title: Re: Griso dash issue
Post by: pete roper on August 04, 2017, 03:42:18 PM
When you turn on the ignition is the dash doing it's 'Christmas Tree' lightshow and the tachometer sweeping?

Pete
Title: Re: Griso dash issue
Post by: Trogladyte on August 04, 2017, 03:52:25 PM
Yes. All seems normal. And trip 1 and trip 2, and speedo are working fine. Clock shows 00:00 am.
Title: Re: Griso dash issue
Post by: Kiwi Dave on August 04, 2017, 04:25:13 PM
Did you also have the tank off?  If so, follow the cable from the LH switch block to where it joins the main loom under the tank.  Perhaps you disturbed something.

Incidentally, I notice that the functions for this switch on Carl Alison's wiring diagram differ from the diagram supplied by MG.  That doesn't help.
Title: Re: Griso dash issue
Post by: Moto on August 04, 2017, 10:27:04 PM
The selection switch is working because you can go into the mode screen. The actual connectors between the switch and the dash (including near the tank) seem unlikely to be a problem, given their construction, and given that you said you had only disconnected the battery.

That leaves the dash itself, I think. It could be you have a marginal electrical problem in it (maybe associated with condensation) that is showing up. I think I had the same failure on my Griso a single time, long before I coated the dash's PCB. At the time, I "cured" the problem by disconnecting the battery and waiting overnight.

Even though you just had the battery disconnected, you might try the overnight disconnection trick. It could be a transient problem that will go away. I can't think of anything else to try, short of taking the PCB out of the dash and down to a phone repair shop for cleaning and coating, which I recommend.

I suppose if you think the dash could be wet right now due to condensation, you could try to dry it out by making sure the bike is in a dry environment and then just waiting. It is possible a droplet of water has condensed from the air and is bridging two circuits. The dash gets wet when the temperature goes down if there has been moisture in the air.

Moto
Title: Re: Griso dash issue
Post by: Trogladyte on August 05, 2017, 09:16:41 AM
The selection switch is working because you can go into the mode screen. The actual connectors between the switch and the dash (including near the tank) seem unlikely to be a problem, given their construction, and given that you said you had only disconnected the battery.

That leaves the dash itself, I think. It could be you have a marginal electrical problem in it (maybe associated with condensation) that is showing up. I think I had the same failure on my Griso a single time, long before I coated the dash's PCB. At the time, I "cured" the problem by disconnecting the battery and waiting overnight.

Even though you just had the battery disconnected, you might try the overnight disconnection trick. It could be a transient problem that will go away. I can't think of anything else to try, short of taking the PCB out of the dash and down to a phone repair shop for cleaning and coating, which I recommend.

I suppose if you think the dash could be wet right now due to condensation, you could try to dry it out by making sure the bike is in a dry environment and then just waiting. It is possible a droplet of water has condensed from the air and is bridging two circuits. The dash gets wet when the temperature goes down if there has been moisture in the air.

Moto

Yeah - that worked.

Disconnected the battery and left it in the garage overnight. Reconnected this morning and everything is working as it should.

Thanks guys.
Title: Re: Griso dash issue
Post by: Trogladyte on December 15, 2018, 09:06:32 AM
I've got exactly this problem again. I changed the battery, and now I have a blank screen on "mode". Trip 1 and trip 2 are fine, the odo reading is fine, and the bike starts and runs fine. Switch on routine is good, with tacho sweep and idiot light xmas tree display.

I'm going to try disconnecting the battery and try again. Again.
Title: Re: Griso dash issue
Post by: Trogladyte on December 15, 2018, 09:41:09 AM
And as if by magic, it's working again. And all without disconnecting the battery again.

If this happens to you, try this: switch the bike off. Give it a minute for the voltages to drain off. Then switch to "mode" with the power off. Switch it back on, so that it boots up in "mode".

This may be a random effect, but it worked for me, so has to be worth a try.
Title: Re: Griso dash issue
Post by: not-fishing on December 15, 2018, 12:14:54 PM
Who set's the clock? 

Sweet Baby Jesus I've had my tanks off and batteries disconnected so many times that I never bother anymore.

Title: Re: Griso dash issue
Post by: Trogladyte on December 15, 2018, 01:53:05 PM
I'd agree that its hardly the end of the world. But I like to know the time when I'm on my way to work every morning. I don't normally do that on the Griso, as its my second bike right now, but I do from time to time.
Title: Re: Griso dash issue
Post by: Moto on December 15, 2018, 11:38:40 PM
Given your foggy location, I suspect you are getting intermittent shorts from condensation. I don't recall this particular kind of problem leading to permanent failure. If it does fail completely it would be good to post this fact for the benefit of others.

Moto