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Re: Raytheon rl70 display problem
Yeah. Check the HSB cable between the two units. Reseat the connectors and the terminators.
Also, are they both HSB1 (as opposed to the later HSB2) models? If they both say Raytheon when booting, then probably they are HSB1. If they say Raymarine, then HSB2. If you have an HSB and and HSB2 unit connected, they may or may not work, and this can depend for example on the chart card being used.
But I'm almost certain, that this is only a connection issue, as 95% of the marine electronics problems are.
If you are unlucky, then it might be a problem with one or more of the units. If you replace them from say eBay, then whatch out for the HSB1 vs. HSB2 issue!