Power Supply Circuit (Pow Board 01P5737); Testing Function In Air; Testing Transmitter Unit And Display Unit With Receiving Transducer - Furuno CN-24 Service Manual

3.1.2 Power Supply Circuit (POW Board 01P5737)

Line Voltage Check
Voltage
+5V
+12V
-12V
+15 V
-15 V
+130V (TV)
GND
Notes: 1) Confirm that each line voltage is within the rated value under the condition of
maximum brilliance.
2) +130V line can be adjusted by R28.
3) Be careful not to short circuit +130V to ground while power is applied.
4) The current consumption of Display Unit is 1.7 to 2.3A.
Frequency Adjustment
Test Point
TP10 - TP8

3.2 TESTING FUNCTION IN AIR

3.2.1 Testing Transmitter Unit and Display Unit with Receiving Transducer.

Procedure
1. Arrange all units as shown below.
Rated Value
4.85 to 5.15 V
11.65t to 12.35 V
-12.6 to -11.4 V
Adjusted by
R50
Measuring Point
01P5726, DISP
J12 #5
J12 #1
J12 #4
-
TP7 and TP8
Rated Value
69.05 to 70.05kHz
Fig.3.2
3-2
01P5737
TP6
TP4
TP5
TP2
TP3
TP1
TP7
Instruments
Frequency Counter