TROUBLESHOOTING - Flycom Avionics
Contents
1. FLYcom TROUBLESHOOTING Trouble shooting is essentially a logical process of elimination and or substitution If you have friends with similar equipment by far the easiest thing to do is a direct substitution with your suspect item in their working system or vice versa Most problem solving is applied common sense in a logical and more importantly a systematic progression A surgeon wouldn t start open heart surgery before he had checked for a pulse so don t start pulling things apart until you have checked the fuse hasn t blown You do have a fuse don t you If everything appears dead it is most likely to be a power supply problem of some sort Note FLYCOM batteries are supplied uncharged If you suspect your battery supply cable combination and substitute it into another aircraft system be careful that the polarity is correct ve is red ve is black Incorrect polarity could harm some radios and some intercoms FLYCOM intercoms will NOT be harmed by incorrect polarity they simply won t work until the polarity is corrected ICOM radios WILL be harmed by incorrect polarity and over voltage IC A6 and IC A24 must be used with 11v supply max Many checks need only a neck top computer Multi meter not needed Other checks need more than just senses intellect i e Multi meter needed A multi meter is needed for checking continuity and is required for measuring a Voltage of power supplies batteries mike phantom voltages2. er Road Holt Heath WR6 6NH England T 44 0 1905 622 343 E jamie flycom co uk W www flycom co uk Registered in England Company no 04853000
3. esistance of one or more k ohms measure sleeve to ring e Is there continuity between the tip of the plug and the white wire plug barrel unscrewed e Is there continuity between the ring of the plug and the red wire plug barrel unscrewed e Is there continuity between the sleeve of the plug and the ground braid plug barrel unscrewed FLYCOM AVIONICS LIMITED Registered office Unit 16H Top Barn Business Centre Worcester Road Holt Heath WR6 6NH England T 44 0 1905 622 343 E jamie flycom co uk W www flycom co uk Registered in England Company no 04853000 FLYCOM e f everything else appears OK but your radio transmissions are broken or transmitting only a very short distance e Is the BNC connector to the radio fitted properly push and turn C W until it clicks e Is the antenna connector fitted properly to the base of the antenna e Is the whip fitted securely into the antenna base e Is there continuity between the whip and the centre pin of the BNC plug e Is there continuity between the outer body of the antenna plug and the outer body of the BNC plug e Is there open circuit between the centre pin and the BNC outer body e Is there continuity between the outer body of the antenna plug and all four foil ground plane strips If you cannot solve your FLYCOM problem yourself call 44 0 1905 622 343 or let me call you FLYCOM AVIONICS LIMITED Registered office Unit 16H Top Barn Business Centre Worcest
4. etc b Resistance of speakers volume controls mikes A resistance measurement of zero ohms indicates electrical continuity closed circuit A resistance measurement of infinite ohms indicates no continuity open circuit Helping yourself Most problems are caused by the failure of only one thing It is extremely unlikely that two things will fail at the same time You can save a lot of time by checking in the right order When you know one thing is OK you can use that thing to check other suspect things If you ring me with a problem will naturally ask you some diagnostic questions Most of these questions are listed below Try and answer as many of these questions for yourself as you can and think about the answers before ringing or e mailing in order to save time Check in this order KEY Multi meter not needed Bullets and text in blue Multi meter needed Bullets and text in red FLYCOM AVIONICS LIMITED Registered office Unit 16H Top Barn Business Centre Worcester Road Holt Heath WR6 6NH England T 44 0 1905 622 343 E jamie flycom co uk W www flycom co uk Registered in England Company no 04853000 FLYCOM e Is there a voltage e Is the voltage the correct value 11 5v flat battery 12 5v full charge e Is the voltage the correct polarity red brown ve blue black ve Centre of DC jack is ve e Is the voltage getting to the intercom Battery connections power lead fuse DC
5. he phono plug making good contact in the hole of the phono socket e Is the outer ring of the phono plug making good contact with the outer body of the phono socket With the intercom power on e Is there a click in the relay when the plug is shorted with a screwdriver or similar conductive tool e Is there a click in the relay when the remote PTT switch is pressed With the PTT lead unplugged e Is there open circuit between the centre pin of the phono plug and the outer ring when the switch is NOT pressed e Is there closed circuit between the centre pin of the phono plug and the outer ring when the switch IS pressed e ls there continuity between the ends of each wire in the lead measured at the soldered joints of the plug switch e Is side tone audible when plugged into a working intercom volume set to max e Is P1 able to hear P2 e Is P2 able to hear P1 e Is there any difference when the helmet headsets are swapped into opposite sockets The helmet headset jack plug has three segments tip ring and sleeve starting from the end tip speaker ring mike sleeve common ground earth e Is there a speaker resistance varying from about 5 ohms to 470 ohms when the volume control is turned from off to maximum measure sleeve to tip e ls there an audible click or scratch during the above test when the red probe is touched to the tip on the jack Wear the helmet headset volume to max e Is there a slowly rising mike r
6. plug socket If no multi meter is available go straight to here If the following checks are OK then both power supply and intercom are OK The intercom is polarity protected The Mk2 3 22 model supplies power to the radio but it does not offer protection to it If the battery polarity is wrong neither the intercom nor the radio will work and the radio will be harmed The intercom will not be harmed Plug the power lead into the intercom on its own removed from the radio e Is there a voltage at the radio power connections top of intercom left of warranty label Mk2 only Note If your battery polarity is wrong the polarity at these connections will also be wrong e Is there a click from the relay when the PTT is operated ear to the intercom e Is side tone audible when a helmet headset is plugged in and turned up to maximum e Is there a loud click when the headset is plugged and un plugged at max volume e Is a mains hum audible in the headset when the tip of the 3 5mm speaker jack is touched with a damp finger do this indoors near mains wiring e Is there a slight increase in volume of side tone on the P1 socket when the PTT is operated e Is there total lack of side tone on the P2 socket when the PTT is operated When the above are OK fit the radio to the intercom and turn it ON Leave the patch lead out and listen to the radio without the helmet headset e Is the antenna fitted securely use rubber duck unless the a c an
7. tenna has been checked OK e Is the radio turned on e Is the volume turned up approx volume e Is the LCD display visible e Is hiss audible when the squelch is turned fully C W listen at the speaker in the radio e Is there reception from a known station listen at the speaker in the radio e ls there transmission to a known station use radio PTT button on side of radio and speak into the mike on the front of the radio If the radio checks OK by its self plug in the patch to the radio and plug in a helmet headset into the P1 socket on the intercom set helmet volume to about 1 4 volume and continue e Is hiss audible when the squelch is turned fully C W e Is there reception from a known station e Is there voice transmission to a known station use the PTT on the intercom not the radio e Is there carrier wave only transmission to a known station TX with hiss but no voice FLYCOM AVIONICS LIMITED Registered office Unit 16H Top Barn Business Centre Worcester Road Holt Heath WR6 6NH England T 44 0 1905 622 343 E jamie flycom co uk W www flycom co uk Registered in England Company no 04853000 FLYCOM The on board PTT switch is wired in parallel with the plug in PTT switch If the on board PTT switch works but the remote plug in PTT doesn t plug the PTT phono plug into the PTT phono socket with the phono plug cover screwed back off With the intercom power off e Is the centre pin of t
Download Pdf Manuals
Related Search