Furuno NX-700B Service Manual page 96

If the "Result" is "NG", replace the RCV board. In the reception test, messages
received at 518 kHz only can be printed by a printer.
Rx Test
Tx Test
ZCZC AZBB <- |T HIS IS AN I NTERNAL TES
T MESSAGE.<-|ABCDEFGHIJKLMNOPQRSTUV
WXYZ,0123456789 - ? * $ ! & # ( )
/ , ' = -? + -> | NNNN
Int'l Rx Data
ZCZC AZBB <- |T HIS IS AN I NTERNAL TES
T MESSAGE.<-|ABCDEFGHIJKLMNOPQRSTUV
WXYZ,0123456789 - ? * $ ! & # ( )
/ , ' = -? + -> | NNNN
Local Rx Data
ZCZC AZBB <- |T HIS IS AN I NTERNAL TES
T MESSAGE.<-|ABCDEFGHIJKLMNOPQRSTUV
WXYZ,0123456789 - ? * $ ! & # ( )
/ , ' = -? + -> | NNNN
Int'l Result
Local Result : OK
Note:
During Rx Test, the power supply (+9 VDC) to the pre-amp unit is turned off.
RF
+12V
+9V
SW
AVR
LO SW DC
Test Signal
RD-B
RD-A
1700Hz+85Hz
Test OFF
Test Start
6. The screen returns to the Service menu screen when any key other than the power key
is pressed or when there is no key operation for one minute or more.
: OK
Hit any key
Test
Signal
RX
518kHz
490kHz
RX
4209.5kHz
MOD
RX Local-1
RX Local-2
Fig. 7.1.2 Overview of Reception Test circuit
518kHz
TD-A/B
RX 1
518kHz
490kHz
RX 2
TD-A/B
490kHz
RCV (08P3227)
7-4
7.1 Self Test
CPU
(08P3225)
NX-700A/B