Furuno FAX-30 Service Manual page 21

RCV board (08P3219)
Signal
TP No.
name
TP1 0 V
TP2 OSC
TP3 0 V
TP4 VCO
TP5 AGC
TP6 +5 V
TP7 1st LO
TP8 2nd LO
TP9 AF
TP10 18 MHz
TP11 0 V
TP12 0 V
TP13 0 V
Rating
V
V=0.8 Vpp to 1.5 Vpp
2.99999 MHz: 8.0 V to 9.5V
29.654950 MHz to
29.655130 MHz
SG level 50 dBµ: 1.0 V or
more
SG level 110dBµ: 7.0 V or
more
4.75 V to 5.25 V
More than 2.0 Vpp
2MHz
1.0 Vpp or more
54 MHz ± 160 Hz
FAX MF/HF:
16.29 kHz ± 400 Hz
FAX LF:
16.29 kHz ± 150 Hz
NAVTEX:
16.29 kHz ± 85 Hz
Va
Vb
Va=-0.3 V to 1.0 V
Vb= 4.0 V to 5.5 V
13
Measuring
instrument
Oscilloscope DDS output level
Multimeter GND: TP3
Voltage at TP4 differs
from the frequency.
Frequency
(See page 7.)
Counter
Multimeter SG setting
Frequency: 4.0 MHZ
No modulation
Multimeter GND: TP3
Oscilloscope First Local Oscillator
Oscilloscope Second Local Oscillator
Frequency GND: TP12
counter
AF-H
Oscilloscope GND: TP12
AF-L
4.3 Test Point
Remarks