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Phone: +86 16626708626Description
Key Technical Specifications
- Model: A206.3 (5), A205.3
- Brand: H.M. Stein Sohn
- Product Type: DAD data acquisition display
- Variant: A206.3 (5) = Master, A205.3 = Sub
- Supply Voltage: 24 VDC
- Application: Marine automation / control systems
- Display Type: Data acquisition display
- Compatibility Note: Match master/sub role before ordering
- Revision Note: Verify exact suffix and cabinet wiring
- A205.3
- A205.3
Product Introduction
H.M. Stein Sohn A206.3 (5) and A205.3 are DAD data acquisition displays used in marine automation systems. The A206.3 (5) is identified as the Master unit, while the A205.3 is the Sub unit, and both are tied to 24 VDC operation.
These units are usually bought to keep older shipboard systems running when OEM replacements are scarce. The main risk is mixing master and sub roles or ordering the wrong suffix, so confirm the exact board label, wiring, and system position before you buy.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Display is blank | No 24 VDC supply or blown fuse | High | Measure supply at the display terminals with a multimeter | Check power and fuses before replacing the unit |
| Wrong unit in system | Master/Sub mismatch | High | Compare the installed label with the original part photo | Make sure A206.3 (Master) and A205.3 (Sub) are not swapped |
| LEDs not updating | Internal board fault or communication issue | High | Check system alarms and verify bus activity | Confirm wiring and system communication first |
| Partial LED segments fail | Display element wear or connector issue | Medium | Reseat connectors and inspect for corrosion | Clean and retest before ordering a replacement |
| Intermittent operation | Loose wiring or vibration | High | Tug-test wiring and inspect terminal screws | Re-terminate and secure the harness |
| Works on bench, fails onboard | System-side compatibility problem | Medium | Test in the original cabinet with known-good wiring | Verify configuration and cabinet setup first |
If you are stuck, send support clear photos of the nameplate, terminal layout, and fault logs.
Frequently Asked Questions
Q: What is the difference between A206.3 (5) and A205.3?
A: A206.3 (5) is the Master DAD display, and A205.3 is the Sub DAD display. They are not interchangeable unless the system documentation says otherwise.
Q: Are these 24 VDC units?
A: Yes, the available listing data identifies both as 24 VDC marine control displays. Verify the cabinet supply before installation.
Q: Are they new or used?
A: The available market listings typically show them as used. That usually means lower cost, but you should still confirm test status and warranty.
Q: Can I swap the master and sub units?
A: Do not assume so. The system may expect a specific role at each position, and swapping them can leave the display or bus logic faulted.
Q: Why are they cheaper than factory-new stock?
A: Most of the time it is because they are surplus or used, not sealed OEM inventory. That is normal for older marine parts, but testing and fit still need to be confirmed.
Q: What should I check before ordering?
A: Check the exact suffix, whether you need Master or Sub, the 24 VDC supply, and the original wiring photo. That prevents most install mistakes.
Q: What if the new display still does not work?
A: Recheck power, wiring, and master/sub role first. On legacy ship systems, the replacement part is often fine and the problem is a mismatch in setup or cabling.
