Self-Test Algorithm; Self-Test Flow - Furuno FS-1503 Service Manual

Self-test Algorithm

(TX/RX Board)
TX + POWER ON
TLX/AGC: ON/RF gain: max. /Freq.:13.5 MHz
Self check signal: ON
R Good displayed
TLX/Tone: 1700 Hz/Freq.:3 MHz/PA: OFF/EXC:
ON/Power data: 255
EXC CHK level reading
0.8 V : RF OUT 20W
2.4 V : 140W
TE Good or TE no Good displayed
The test proceeds to next step;
1) if dummy board is fitted,
2) if system channel 9917 is set to "1", and
3) if above test is successful (TE Good).
Cont'd on next page
Power on while pressing and holding down [TX].
U22 ON TX/RX PCB: ON
S level reading
NO
S level > 4?
YES
R no Good displayed
(Beep × 1)
J6-6 on TX/RX PCB
NO
> 0.8V?
YES
TE Good displayed
TE no Good displayed
(Beep × 1)
Self Test completed
Figure 5-1 Self-Test Flow (1/2)
13.5 MHz produced from 2LO is input to antenna.
Mode: TLX, AGC:ON, RF GAIN: automatically
set to Max.
(Beep × 3)
3 MHz, TLX, POWER DATA: 255,
Only TX on TX/RX PCB turned ON.
(Beep × 3)
5-3
Receiver on TX/RX PCB check
Transmitter on TX/RX PCB Check