Drv (Fs-2575 And Fs-5075); Sw-Reg 1 And Sw-Reg 2 (Fs-2575 And Fs-5075) - Furuno FS-1575 Service Manual

4. DRV (FS-2575 and FS-5075)

This test menu is used to conduct the DRV board tests in the 4 MHz band.
The "DRV" tests are conducted with "TX IF signal: 36 kHz" outputted from CODEC,
mode set to "J2B," power data set according to the model of the system in use, and
output power of approximately 20 W.
The DRV board is determined to be OK when the detected "CHK DA: VF" signal level
is not lower than a specified level.
Note) "VR DA" is not used.
The detected level can be checked by selecting [MENU] -> 9.SERVICE ->
3.RT SETUP -> 1.SETUP -> 2.SELF CHECK -> "DRV VF" or "DRV VR."
Furthermore, the TX, DRV, and PA boards are set to transmission "ON," and the TX FIL
board output is terminated with the 50 ohm dummy load.
J5 J2
TX
ATT
RF RF IN
PROTECT
VR DA
CHK DA

5. SW-REG 1 and SW-REG 2 (FS-2575 and FS-5075)

The FS-2575 system has no check items for SW-REG 2.
"SW-REG1" and "SW-REG2" are used to check for the TX ON, DA ON, and PA ON
control signals in the OFF state.
These items check for the collector voltage (42 VDC) of the PA transistor on the PA
board.
The check point is the VC check signal on the PA board. The switching regulator is
determined to be OK when the detected level is not lower than a specified level.
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.
Q2
T2
T1
Q1
Q3
BIAS
BIAS 15V BIAS
Fig. 6.1.10 DRV CHK Circuit Diagram
6-11
Q4
T5
T6
DIV
Q5
DET
Vf/Vr
For
FS-5075
24V
DRV
6.1 [MENU] -> TEST
RF OUT 1
PA
RF OUT 2