Wanted Type 100 or 300 autopilot computer - working or non working
- Thread starter Tim Owen
- Start date
- Boat name
- JOY TO THE WORLD
- Berth
- Gosport
- Boat type
- Moody 44 (90s)
- Cruising area
- Solent
Hi Tim I sold my old 300 to a chap called Daniel Hawkes in 2021, he was repairing these as a side hobby. He may be able to help? daniel@positivemarine.com
John
John
- Boat name
- STOLEN MOMENTS
- Berth
- Birdham Pool, Chichester
- Boat type
- Moody 346
- Cruising area
- Solent
Service manual here:
Tim Owen
Member
- Boat name
- DULCINEA
- Berth
- Kerrera Marina, Oban
- Boat type
- Moody 40 (90s)
- Cruising area
- West Coast of Scotland
Thanks David, i have that manual, but it leaves the actual circuit diagrams blank and just gives block diagrams - so fault finding is going to be tedius as ill have to trace the surface mount boards..... I do have some clues to what is going wrong - probably the gate voltage driver VDBL for the output bridge to the helm motor. The +/- 12V motor drive drops to +/- 2V after a couple of hours use and causes the autopilot to alarm etc,
I currently have a replacement stuck somewhere in the UPS system.
I currently have a replacement stuck somewhere in the UPS system.
- Boat name
- STOLEN MOMENTS
- Berth
- Birdham Pool, Chichester
- Boat type
- Moody 346
- Cruising area
- Solent
Tim
I recently repaired one of these for a colleague - in his case the clutch drive output was dropping/intermittent. I replaced the power FET in the clutch drive and 'reflowed' the surface mount components which form the drive to the FET. After that it started working OK. The power FET's in the clutch and motor drive are relatively easy to replace (you just need a soldering iron and solder 'sucker' ). The FETS were obsolete but it was easy to source modern ( and better) equivalents.
To reflow the surface mount components I used a hot air solder gun. But there is little else you can do internally as replacing surface mount components is very tricky. To make matters worse the drive components were under a blob of 'potting' (see picture below) to support the FET . I had to carefully remove this by heating with a solder gun and picking it off with a dental pick.
The processor is plug in and pre programmed - but the getting a replacement for it given its age would be nearly impossible unless you had a donor unit.
I agree the service manual is a little frustrating as it has some circuit diagrams and a mix of block diagrams - it leaves you to work out how the drive for the clutch and motor is implemented. My guess is that Raymarine do not intend folks to be able to repair these units.
Kindest
David
I recently repaired one of these for a colleague - in his case the clutch drive output was dropping/intermittent. I replaced the power FET in the clutch drive and 'reflowed' the surface mount components which form the drive to the FET. After that it started working OK. The power FET's in the clutch and motor drive are relatively easy to replace (you just need a soldering iron and solder 'sucker' ). The FETS were obsolete but it was easy to source modern ( and better) equivalents.
To reflow the surface mount components I used a hot air solder gun. But there is little else you can do internally as replacing surface mount components is very tricky. To make matters worse the drive components were under a blob of 'potting' (see picture below) to support the FET . I had to carefully remove this by heating with a solder gun and picking it off with a dental pick.
The processor is plug in and pre programmed - but the getting a replacement for it given its age would be nearly impossible unless you had a donor unit.
I agree the service manual is a little frustrating as it has some circuit diagrams and a mix of block diagrams - it leaves you to work out how the drive for the clutch and motor is implemented. My guess is that Raymarine do not intend folks to be able to repair these units.
Kindest
David
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