Troubleshooting - FUTABA 4VF-FM Instruction Manual

Frequencies
The following frequencies and channel numbers may
be used for aircraft and surface in the United States:
72 MHz Band: (Aircraft only)
72.010 11 72.210 21
72.030 12 72.230 22
72.050 13 72.250 23
72.070 14 72.270 24
72.090 15 72.290 25
72.110 16 72.310 26
72.130 17 72.330 27
72.150 18 72.350 28
72.170 19 72.370 29
72.190 20 72.390 30
If your digital proportional R/C set does not operate, its range is short, it intermit-
tently stops operating, or it operates erroneously, take the action shown in the table
below. If this does not correct the trouble, please contact a Futaba dealer.
Check point
Transmitter/receiver
battery
Transmitter antenna
Crystal
Connector connection
Receiver antenna
Servo linkage
Motor (electric motor
plane)
72.410 31 72.610 41
72.430 32 72.630 42
72.450 33 72.650 43
72.470 34 72.670 44
72.490 35 72.690 45
72.510 36 72.710 46
72.530 37 72.730 47
72.550 38 72.750 48
72.570 39 72.770 49
72.590 40 72.790 50

TROUBLESHOOTING

Check item
Dead battery.
Incorrect loading.
Faulty contact con-
nection.
Dirty contacts.
Loose.
Not extended to full
length.
Disconnected.
Wrong band.
Different from specifi-
cation.
Incorrect wiring.
Disconnection.
Close to other wiring.
Not cut?
Not bundled?
Binding or looseness
Noise countermea-
sures.
75 MHz Band: (car/boat only)
75.410 61
75.430 62
75.450 63
75.470 64
75.490 65
72.810 51
75.510 66
72.830 52
75.530 67
72.850 53
75.550 68
72.870 54
75.570 69
72.890 55
75.590 70
72.910 56
72.930 57
50 MHz Band: (Aircraft/car/boat -Fcc
72.950 58
Amateur license required)
72.970 59
50.800 00
72.990 60
50.820 01
50.840 02
50.860 03
50.880 04
Action
Replace the battery. Charge the nicd
battery.
Reload the batteries in the correct
polarity.
If the contact spring is deformed,
correct it.
Wipe with a dry cloth.
Screw in.
Extend fully.
Push in.
Match transmitter/receiver band.
Replace with specified crystal.
Reinsert.
Push in.
Separate from other wiring.
Request repair.
Install in accordance with instruction
manual.
Adjust at the fuselage side.
Install a noise absorbing capacitor.
75.610 71 75.810 81
75.630 72 75.830 82
75.650 73 75.850 83
75.670 74 75.870 84
75.690 75 75.890 85
75.710 76 75.910 86
75.730 77 75.930 87
75.750 78 75.950 88
75.770 79 75.970 89
75.790 80 75.990 90
50.900 05
50.920 06
50.940 07
50.960 08
50.980 09