Antenna Coupler Unit - Furuno FS-1562 Manual

FS-75/2550

5.2 Antenna coupler unit

The CPU and the relays which select capacitors and coil for tuning can be checked.
Procedure
1. Open the antenna coupler cover.
2. Open the shield cover inside the coupler.
3. Turn on No.2 of the DIP switch S2.
4. Press the TUNE switch in the antenna coupler.
5. The 24 LEDs (CR1 to CR24) light one by one for 1 second each.
6. Turn off No.2 of the DIP switch S2.
7. Close the covers.
If CPU error is detected, CR1 lights for ROM error, CR2 for RAM error, CR3 for A/D
converter error. (ROM/RAM/AD converter incorporated in the CPU.)
A2-12