Pa Board: Pa Ic Reading Adjustment (Fs-1575, -2575, -5075) - Furuno FS-1575 Service Manual

50.0V
49.0
48.0
47.0
46.0
45.0
44.0
43.0
42.0
41.0
40.0
39.0
38.0
Fig. 5.7.6 FS-2575: Example of Vc Reading Characteristics

3. PA Board: PA Ic reading adjustment (FS-1575, -2575, -5075)

Procedure)
1. Turn OFF the power supply, and then connect a 50 ohm power meter or dummy
load to the [T/R ANT] terminal of the FS-xx75T.
2. Connect a 10A/DC ammeter to the 42V/24V PA Vcc line.
Measurement circuit is the same as that shown in the "1. PA transistor BIAS
adjustment" section on page 5-35.
PA
(05P0867A, B)
PA
(05P0868)
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.
39.0 40.0 41.0 42.0 43.0 44.0
Power input Voltage
-
Ampere
Meter
[J4]
#1-3: 42V
#5-7: 0V
#4: 24V
-
Ampere
Meter
[J4]
#1-3: 24V
#4-6: 0V
Fig. 5.7.7 PA IC Reading Adjustment Circuit
5-37
45.0 46.0 47.0 48.0 49.0 50.0V
+
[J1]
#1-3: 42V
SW-REG
#5-7: 0V
(05P0873)
#4: 24V
+
[J2]
#1-3: 24V
P-SW
(05P0871)
#4-6: 0V
5.7 Board Adjustment
FS-2575, -5075
FS-1575