Furuno FM-8800D Service Manual page 137

Unit
FM-8800S
FM-8800D
JUNCTION BOX:
IF-8810
DMC INTERFACE:
IF-8820
HANDSET:
HS-2003
HANDSET:
HS-8800
REMOTE
STATION: RB-8800
REMOTE
STATION: RB-8810
Board
Consists of CPU, DSP, CODEC, and DDS. 2nd IF: 37.5 kHz
from CH70 RX, TX/RX, DUP RX board is demodulated by
CPU
digitization. Audio signals are digitized just the same, is
(05P0773)
modulated on this board, and is outputted to TX/RX board
with 45 MHz.
Consists of TX/RX circuit. 05P0774A, SIMP-equipped
FM-8800S, and 05P0774B are installed in DUP-equipped
FM-8800D. The difference is whether there is a connector for
TX/RX DUPLEXER.
(05P0774A/B) - RX circuit: receives RX signal of 150 MHz, converts it into
2nd IF: 37.5 kHz and outputs it into CPU board.
- TX circuit: converts modulated signal of 45 MHz from CPU
board to TX frequency and outputs 25 W.
Has the same function as CH70 WR. This converts DSC RX
CH70 RX
signal of 156.525 MHz into 2nd IF:37.5 kHz and outputs it
(05P0775)
into CPU board.
Is installed in FM-8800D. This board receives the signal when
DUP RX
DUP CH is selected, converts RX signal of 160 MHz into 2nd
(05P0777)
IF: 37.5 kHz, and outputs it into CPU board.
Is installed in FM-8800D. DUPLEXER prevents TX signal to
entering RX circuit and makes DUPLEX communication
DUPLEXER
possible by carrying out TX with LPF of 157.5 MHz and RX
with HPF of 160.6 MHz.
Outputs +15 VDC from input power of +24 VDC and is
POWER
equipped with over voltage protection, low voltage protection,
(05P0776)
and over-current protection.
PANEL Consists of LCD, KEY SW, and their lighting. LCD dot
(05P0772) numbers are 160 x 160. ** 26 characters x 20 lines.
Added to the Russian Ver.
RTC
On the RTC board, use for Time stamp (Date and Time) in the
(05P0804)
[LOG] menu.
JUNCTION Functions as a junction between the Transceiver unit and
(05P0790) Remote station, GPS, VDR and Wing-MIC.
Non-use for the Russian Ver.
DMC IF
Makes a communication with the Transceiver unit CPU and
(05P0778)
interfaces DMC-5 and a Remote stations.
HANDSET Is to be connected to the Transceiver unit and uses Condenser
(05P0780) MIC.
HS CONT Sends a result of key operation to the Transceiver unit CPU
(05P0781) and the Transceiver unit responds to its result.
KEY
Consists of lighting circuit of key and LED.
(05P0715)
LCD Module A total dot numbers are 91x72. Indication will be within 13
(MFM-073Q10) digits x 7 lines.
REMOTE
Consists of DISTRESS ALERT BUTTON and AF AMP.
(05P0779)
TB (05P0782) Functions as a junction between a Remote stations
TB (05P0798) Functions as a junction between a Remote stations
Table 5.3.1 Outline of each board
Main function
5-5
5.3 Outline of Boards