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

1. PA Board: PA transistor BIAS adjustment (FS-1575, -2575, -5075)

Procedure)
1. Turn OFF the power supply, and then connect a 1- to 2A/ DC ammeter to the
42V(FS-1575: 24V) line of PA Vcc connector.
PA
(05P0867A, B)
PA
(05P0868)
J1
SW-REG
Fig. 5.7.5 FS-2575: Example of Ammeter Connection
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-
Ampere
Meter
[J4]
#1-3: 42V
#5-7: 0V
#4: 24V
-
Ampere
Meter
[J4]
#1-3: 24V
#4-6: 0V
Fig. 5.7.4 PA IC BIAS Measurement Circuit
5-35
+
[J1]
#1-3: 42V
SW-REG
#5-7: 0V
(05P0873)
#4: 24V
FS-2575 and FS-5075
+
[J2]
#1-3: 24V
P-SW
(05P0871)
#4-6: 0V
FS-1575
J4
5.7 Board Adjustment
PA