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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics > Autohelm ST4000 Plus problems
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Thread: Autohelm ST4000 Plus problems Reply to Thread
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Topic Review (Newest First)
02-18-2013 11:58 PM
TakeFive
Re: Autohelm ST4000 Plus problems

Quote:
Originally Posted by cas206 View Post
I wonder if they really mean the processor, or if that is just a general statement they make to avoid fixing it. My unit had the low battery problem. Here is what I was able to determine on mine. The processor has a "buzzer" output line which is logic level 5 volt pulses. This drives an inverter which acts as a buffer. That in turn drives a transistor that creates 12 volt pulses from the 5 volt pulses. The 12 volt pulses feed a charge pump/voltage doubler to provide 24 volt bias on one of the power MOSFETs. This MOSFET switches closed to provide 12 volts to power the H-bridge driving the motor and the output clutch circuit (whatever that is used for). In my device, the BAV99 (I think that's the nomenclature, going from memory) dual diode package was bad. The result was that only 12 volts was biasing the MOSFET so that it did not switch closed to power the H-bridge. I was able to replace it and get mine operational again. Before I did that though, I removed that MOSFET and jumpered the 12 volts from 12 volts external to 12 volts internal to check that everything else was operating normally.
Yeah, what he said!
02-18-2013 07:27 PM
cas206
Re: Autohelm ST4000 Plus problems

I wonder if they really mean the processor, or if that is just a general statement they make to avoid fixing it. My unit had the low battery problem. Here is what I was able to determine on mine. The processor has a "buzzer" output line which is logic level 5 volt pulses. This drives an inverter which acts as a buffer. That in turn drives a transistor that creates 12 volt pulses from the 5 volt pulses. The 12 volt pulses feed a charge pump/voltage doubler to provide 24 volt bias on one of the power MOSFETs. This MOSFET switches closed to provide 12 volts to power the H-bridge driving the motor and the output clutch circuit (whatever that is used for). In my device, the BAV99 (I think that's the nomenclature, going from memory) dual diode package was bad. The result was that only 12 volts was biasing the MOSFET so that it did not switch closed to power the H-bridge. I was able to replace it and get mine operational again. Before I did that though, I removed that MOSFET and jumpered the 12 volts from 12 volts external to 12 volts internal to check that everything else was operating normally.
02-12-2013 01:14 PM
melvyn.trigg
Re: Autohelm ST4000 Plus problems

Hi all,

I have experienced the same problems with my ST4000+ Head unit, which is installed on my recently purchased Catalina 36 Mk II. The 'Low Battery warning would kick in after a short period, forcing you to switch back on to 'Standby'.

Fortunately I had a the original ST4000 unit, which I replaced. This cured the problem. The ST4000+ was returned to Raymarine UK, along with the drive unit for examination. Raymarine told me that the processor in the head unit was faulty and that as these units are now obsolete, they do not carry the parts to replace it, and if they could, it would cost around £400.00. They did offer me a discount on a new wheel pilot for around £1100.00.

So for now I shall be using the original ST4000 Head.
01-08-2013 03:25 AM
kwiggy
Re: Autohelm ST4000 Plus problems

Thanks for that info szigi. That all makes sense.

I did actually end up getting in touch with a Raymarine tech guy here in Australia, but he knew very little about it & his advice was for me to buy a new one. I sent a message to Raymarine on their website, but they never responded.

I'll pull it apart this week & have a look.

Thanks for all the advice
01-08-2013 03:03 AM
szigi
Re: Autohelm ST4000 Plus problems

It's definitely not backlight problem, as the LCD should be visible in natural light, without backligth.
The ST4000+ is fairly easily taken apart. The LCD is held in place by a plastic bracket, secured by screws. Take it off, and carefully clean the contacts on the circuit board. If you are real careful, you can also clean the contacts on the LCD itself (they are invisible!) and the rubber conductor that is between the LCD and the board. Don't use WD40 or like, use alcohol!
This can help. However, if the LCD is uniformly dim, then probably there are other problems, as the above contact problems usually result in some of the segments6pixels being dim.
BTW, at the Raymarine Technical Forum Raymarine Technical Forum they seem to be very helpful and responsive, try that.
01-08-2013 12:42 AM
kwiggy
Re: Autohelm ST4000 Plus problems

Agreed, I think it must be a problem with the LCD, so I will take it apart and have a look
01-07-2013 11:13 PM
cas206
Re: Autohelm ST4000 Plus problems

It doesn't sound like a back lighting problem. I have my ST4000+ control head taken apart. The LCD is easily readable without back lighting.
01-07-2013 08:00 PM
redline
Re: Autohelm ST4000 Plus problems

This may not apply to your 4000+ or its firmware version, but some Raymarine instrument heads have adjustable contrast:


To set the contrast level for the ST7001 display:
1. With the autopilot in Standby mode, press the disp key for one second to
access the LAMP screen.
2. Press the disp key for one second again, to display the CONTRAST screen.
3. Use the up and down arrow keys to set the required contrast level (from
1 to 15). >/quote>
01-07-2013 06:39 PM
kwiggy
Re: Autohelm ST4000 Plus problems

Hi, I am new to this forum & can't figure out how to post a new question.

I have searched through the various forums, but can't find this problem mentioned anywhere.

My ST4000+ display seems to have become very dim. If I look very carefully, I can just see the heading in certain light conditions, but it's almost impossible to make anything else out on the screen.

I am not sure if this is a LCD or a backlight issue, or something else. Raymarine have been impossible to contact for help (as always).

I hope someone can help.
12-04-2012 08:34 PM
cas206
Re: Autohelm ST4000 Plus problems

The maintenance manual available on the web has a circuit diagram for the control head. The output circuit appears to be a H-Bridge as described at http://modularcircuits.tantosonline....es-the-basics/ . FYI, for anyone attempting to fix a broken control head.
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