Furuno FS-1575 Service Manual page 344

2) WR2 board: WR2 INST N
The WR2 INST signal is used to select whether to use the WR2 board or the RX board
in order to watch SCAN upon receiving general DSC frequency.
If the WR2 INST signal is detected, the WR2 board will be used to watch SCAN upon
receiving general DSC frequency. If not, the RX board will be used to watch the same.
3) DUP FIL board: DUP INST N
The DUP INST signal is one of parameters used to set communication mode to DUP.
Conditions to allow the operation of the system in FULL DUP mode are as follows:
• The DUP FIL board is mounted (to detect the DUP INST signal).
• Menu settings are made as [MENU] -> 9.SERVICE -> 3.RT SETUP -> 1.SETUP ->
"RX ANT" - > "CONNECT."
• Menu settings are made as [MENU] -> 5.SYSTEM -> 7.RX SETUP -> 2.ANT
SELECT -> "RX ANT."
• Tx/Rx frequencies on the SSB/HF band differ in a specified range.
• The FS-5075 system is in use. (Verification of model)
4) COMB board: COMB INST N
The COMB INST signal is used to verify the model of a system.
The model of a system is verified by the combined use of the INST signal of the COMB
board and the "R67" PAIF MDL VER1 signal of the PA-IF board. To display the model,
select [MENU] -> 9. SERVICE -> 1. EQUIP TYPE.
The model is verified when turning ON the power supply.
Model
FS-1575
FS-2575
FS-5075
COMB
COMB INST N
Fig. 6.5.3 INST Signal of COMB / PA-IF Board
CONFIDENTIAL (internal use only)
This confidential document is used only by FURUNO authorized persons.
It is strictly prohibited to reproduce the document in whole or in part without prior written permission of FURUNO.
PA-IF Board:
COMB (COMB INST N)
R67
Mounted
Not mounted
Not mounted
PA-IF
3.3V
R61
PAIF MDL VER0
PAIF MDL VER1
R67 0hom
FS-1575(05P0864A):
Mounted
FS-2575, 5075(05P0864):
Not mounted
6-29
PA-IF Board
Not mounted 05P0864A
Not mounted
Mounted
MOT
3.3V
R74
U1
CPLD
R77
6.5 SERVICE: TEST
05P0864
05P0864
T-CPU