Furuno FS-5000 - Page 372

FELCOM 82
H3-43
DEMOD
Parts No. Check Item Remarks
CR1 Input level of AD
converter
When the AD converter U49 is in saturation or when TP54
is 2 Vpp or more, the LED comes on.
CR2
CR3
Status of DEMOD
DSP
On/off: Waiting signal; off/on: Fast Fourier Transforming;
on/on: Tracking signal
CR4
CR5
CR6
Communication
mode assigned by
SYS CPU to
DEMOD DSP
On/off/off: BPSK; on/on/off: Voice; off/on/off: 9.6k FIU; and
off/off/on: HSD
CR7 DEMOD DSP status When DEMOD DSP runs, CR7 blinks.
CR8 Not used
CR9 Selection of input
signal to AD
converter
On: At communication other than HSD
Off: At HSD communication (Input to AD converter is 1.5
times higher in level than other communications.)
SYNC
Parts No. Item Remarks
CR10
CR11
Status of SYNC DSP On/off: Waiting Frame Bit and Unique Word
Off/on: Acquiring FB twice or losing FB twice
On/on: Synchronized
CR13
CR15
CR17
Communication
mode assigned by
SYS CPU to SYNC
DSP
On/off/off: BPSK; on/on/off: Voice; off/on/off: 9.6k FIU;
and off/off/on: HSD
CR19 DEMOD DSP status When SYNC DSP runs, CR7 blinks.
CR21 Frame sync signal After frame synchronization, CR21 toggles on and off
every time frame bit signal is received.
DECODE
Parts No. Item Remarks
CR12
CR14
CR16
Communication
mode assigned by
SYS CPU to SYNC
DSP
On/off/off: BPSK; on/on/off: Voice; off/on/off: 9.6k FIU;
and off/off/on: HSD
CR18 DECODE reset Every time DECODE DSP is reset, CR18 toggles on and
off.