Troubleshooting hsb2 communications

[Chuck - Raymarine - Moderator]

Raymarine's hsb2 Pathfinder Series Radar, Chartplotter, and Fishfinder The following troubleshooting steps should be undertaken when troubleshooting hsb2 communications.

- Verify that all Pathfinder Series Displays are equipped with hsb2 communications circuitry

- Verify that the hsb² network is properly terminated (i.e. 2 hsb2 inline termination plugs only and that these hsb2 inline termination plugs have been installed within the two displays forming the end of the hsb2 daisy chain (See diagram below). If a DSM30 or DSM300 fishfinder sounder module has been installed, then the DSM should be installed at one end of the hsb2 daisy chain. The DSM250 requires a hsb2 Inline Termination Plug, while the DSM30 and DSM300 are internally terminated. If the display's hsb2 port is gray, then no hsb2 inline termination plug has been installed in the display's port. If the display's hsb2 port is black, then you are looking are the male end of a hsb2 inline termination plug.



- Verify that the hsb2 inline termination plug has been removed from any display into which a hsb2 Y-Cable has been inserted (see diagram above)

- Verify that all hsb cables are securely seated and have proper strain relief

- Verify that there are no damaged hsb cables by visually inspecting and performing continuity tests

- Verify that the hsb cable(s) have not been subjected to excessively small radius bends (<6 inch diameter). Subjecting these cables to excessively tight bends can permanently damage the cables. Excess cable should be loosely coiled and secured to a bulkhead

- If the system contains more than 2 hsb² nodes, attempt fault isolation to identify the faulty component (i.e. connect 2 nodes at time to verify communications between the two nodes)

- Verify that no more than 2 C-Map SW+ regions are being served on the hsb² network.

- Perform resistance tests and continuity tests of the hsb² components:
-- Terminators (uninstalled from hsb² port): 120 +/- 2 ohms across the HSVB_POS & HSVB_NEG pins (see diagram above)
-- Pathfinders (power off): 2200 +/- 50 ohms across the HSVB_POS & HSVB_NEG pins ... should results differ, then the display's hsb2 communications circuitry has failed.
--Terminators (installed): values should drop by approximately 5 ohms from the value measured prior to installation ... should results differ, then the display's hsb2 communications circuitry has failed.
-- For multiple display systems, with the system's hsb² displays reconnected to the hsb² network and the Pathfinder PC disconnected from the hsb² network, measure the resistance of the network through the hsb² cable:

Displays.......... Resistance

1____________114

2____________108

3____________103

4____________99

5____________94

6____________90

7____________87

8____________84

- For maximum system performance, verify that all Pathfinder Series Displays have v4.11 software installed within them ... please note that Raymarine's Product Repair Center can no longer update the software within these hsb2 Pathfinder Series Displays

Unfortunately, should one or more of the displays have failed hsb2 communications circuitry, then it must be replaced, as Raymarine's Product Repair Center can no longer service these displays.

RAYFAQ#