Miscellaneous; Trouble Shooting; Fuse Replacement; Signal Interference - Wavecom W 4010 User Manual

Equipment symptom
Equipment shows no function at all
Tuning display blinks with no signal
Equipment resets arbitrarily
No serial or parallel outputs
No TTL output
Incorrect character output to peripheral
equipment
Character loss on parallel or serial output
interface
Tuning display non-distinct
Tuning display is not capable of showing full
deviation
Video display is not correct
Remove the two screws on each side of the case and then remove the top and bottom covers. The fuse
holder is located on the right-hand side of the PCB near the rear, and the fuse can be pulled easily from the
holder. Use only a small fuse of 5 × 20 mm dimensions with maximum 2 A, rated as fast-blowing.
If, after first checking the correct polarity of the supply voltage, the fuse blows again, the problem is in the
equipment. Never replace the fuse with one of higher rating or with an aluminum foil short, since this will
damage the equipment further.
All microprocessors and various peripherals can generate broad-band radio-frequency interference (RFI),
which may be radiated by the interconnecting cables. The WAVECOM equipment is engineered to reduce this
RFI to a minimum by utilizing RF chokes on all outputs. A metal case is used to shield the circuitry, and as a
further RFI preventing measure, each PCB is individually shielded with copper foil. Video monitors and print-

5. MISCELLANEOUS

5.1 TROUBLE SHOOTING

Possible cause
Check power supply and fuse
Supply voltage too low, must be a minimum of 12 VDC
Unstable supply voltage or intermittent contact
Push [PRINT], LED must glow
Check if peripheral is "on-line"
Check DTR hand-shaking line (ready means a + voltage of 3
to 12 Volts)
Check to see if peripheral (or cable short) is loading the line
too much
Check if both Baud rates set to same speed
Check if data format is correct
Check if shift jumper is set correctly
Check whether DTR signal is OK
Check speed capability of printer with slower signals
Check filter knob position, eventually turn counter-clockwise
Check ground of audio input
Turn level knob counter-clockwise
Check display deviation with other signals
Audio input level too low, try taking audio from the loud-
speaker
Try a different monitor
Check that the synch frequency is set correctly
Check that the horizontal hold is set correctly
Check the contrast and brightness
Turn the W 4010 off - then on, press [F1] then [F3]

5.2 FUSE REPLACEMENT

5.3 SIGNAL INTERFERENCE

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