Confirm your model
Match SC4000 with SC4150 control handset to B4150GB0 Issue G/0641: this manual explicitly covers hardware mk4 and software05.07.00 or higher, not every earlier system.
How it connects
Match SC4000 with SC4150 control handset to B4150GB0 Issue G/0641: this manual explicitly covers hardware mk4 and software05.07.00 or higher, not every earlier system. Record Ready, Ready Internal, Locked or the exact SIM message before changing anything. Ready Internal permits local handset/analogue-phone calls but is not external Iridium readiness. A busy display showing Internal call or External call can mean another connected handset occupies the system. The handset user-password lock and SIM PIN are separate; do not guess either or change crew permissions. In this manual the speaker is listen-only: switching it on turns the microphone off, so that symptom is not proof of a failed microphone. Preserve logs and settings; no reset, chargeable test call, account change, firmware or powered antenna work. Historical documentation does not confirm current service eligibility.
Before buying parts
These are compatibility notes and official reference links. Confirm the fault and exact part before buying.
Model-specific parts: start with the official source
Confirm the exact model and part number with the manufacturer or provider before buying any replacement part or accessory.
Check the model and official instructions ↓