Furuno GP-90, Руководство по обслуживанию

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4. Troubleshooting
11
2. Press [1].
Table 4.3 Details of selftest
No. Test item How to test Parts to be tested
1
PROGRAM MEMORY
(Flash ROM)
Reading check sum data
U12, U13
2 SRAM
Writing test data and reading it.
U21, U27
3 Internal Battery
2.65 V or more
BT1
4 DATA 1 PORT U16, Q13, U17, R78
5 DATA 2 PORT U16, Q14, U28, R71
6 DATA 4 PORT
Receiving output data with
short-connector
U23 (SIO), U16
U29 (RS - 232C),
U30 (RS - 422),
R97, R98
7 GPS
Selftest of GN - 8091
(See next page for details.)
GN-8091
8 BEACON
Receiving receiver status by sending
request signal.
GR-7000A
PROGRAM MEMORY OK
SRAM OK
Internal Battery
OK
DATA 1 PORT NG
DATA 2 PORT NG
DATA 4 PORT NG
GPS OK
BEACON OK
MENU: Escape
MEMORY, I/O PORT TEST
NG appears if the test
connectors are not connected
to DATA ports
Blank if BEACON board is
not installed.