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34: Philips FM 900 Series Service notes:

[compiled by Andy Beales VK4KCS]

Symptom:

Radio keys up when P.T.T. is operated but although the "Tx" light stays on, only a brief moment of power out is
observed.

The loudspeaker makes a faint "squeak" whilst this output power is present.

Check:

Using an oscilloscope check to see if Pin 6 of I.C. 201 on the R.F. board shows signs of oscillations while the
P.T.T. is operated.

This I.C. takes care of switching the radio from Rx to Tx and some other housekeeping chores.

If oscillations are observed then this is what is causing the problem.

Fix:

1/. Fit a 0.001uF ceramic or polyester capacitor from Transistor Q 203 B to E. This is successful about 80% of
the time.

2/. Fit a 0.1uf polyester capacitor from I.C. 201 Pin 6 to Pin 16 (ground). This is almost always successful.

Only one radio I ever encountered needed both these fixes added.

Symptom:

No Transmitter.

Check:

After eliminating all the usual causes for no power out, check that there is switched supply voltage at the Emitter
of Q 209 on the R.F. board.

Voltage should be present while P.T.T. is operated.

Fix:

If this transistor is faulty then either leave it in place and short-circuit Collector to Emitter or if a replacement is
available then change the device.

General Notes.

Anytime that the lids are off an FM 900 then check the condition of C 432 and C439, 10uF 50v. electrolytics in
the Voltage doubler circuit on the Logic board.

This part of the circuit supplies about 17 volts to the P.L.L. circuit, this voltage eventually being used as the
Steering voltage to control the frequency of the V.C.O.

All manner of strange symptoms can be observed if this voltage is not stable and fed from a low impedance
source.

These capacitors operate at an elevated temperature in the radio and are prone to dry out long before any other
components show signs of distress.

I have measured caps removed from a faulty radio as having a capacity as low as 0.5uF.

One of these capacitors is inside the metal shield and one just outside.

Quite often the P.C.B. is is coloured in the vicinity of these capacitors.

V.C.O. and Rx. Front end Modules.

These two modules both suffer a common manufacturing problem in that when the module housing was being
plated, they were not cleaned properly of the acid used to initially clean the base metal.

This acid slowly reacts with the plating and over a period of time, Dendrites or very fine metallic whiskers can
grow inside the module and eventually short out to the pins on the edge of the ceramic substrate that supports
the components or to the components themselves.

Philips FM92E Conversion to 6 Meters: Version 3.9 Page

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Содержание FM92E

Страница 1: ...PHILIPS FM92E Conversion To 6 Meters Ver 3 9 21 Apr 2007 Rod McCosker VK2DOT Philips FM92E Conversion to 6 Meters Version 3 9 Page 1 ...

Страница 2: ...annels and repeater simplex channels EPROM s will be supplied to club members who are on the course At the end of this document is information on programming the EPROM for external users who intend to program their own EPROM The software for setting up the firmware is also located on the web site This document 6m_con doc or 6m_con pdf the 6 meter frequency verses channel list 6m_fre rtf and the EP...

Страница 3: ...beep from the FM92E 61 25 FM92R Source Listing 62 26 Disable scan inhibit with microphone off hook 62 27 Emergency umbilical cable replacement 62 28 Fixing tinny transmit modulation by adjustment 63 29 Fixing tinny transmit modulation by microphone modification 63 30 Fixing tinny transmit modulation by microphone modification 63 31 FM900 12 Digit Hardware codes 64 32 FM92E Rear Connectors 64 33 15...

Страница 4: ...Code 9502 9226 0000 12 5 KHz channel 25W 10 7 MHz IF Software Code 110400200000000 Check Sum 6m7loc bin EPROM for Philips FM92E with Local Head Hardware Code 9502 9227 0000 12 5 KHz channel 25W 21 4 MHz IF Software Code 110400200000000 Check Sum 2FFF 6m8rem bin EPROM for Philips FM92E with Remote Head Hardware Code 9502 9228 0000 12 5 KHz channel 25W 21 4 MHz IF Software Code 110400200000000 Check...

Страница 5: ...OTHER FILES Fpp zip Software for generating channel verses frequencies for Philips FM92E for 6 Meters Philips FM92E Conversion to 6 Meters Version 3 9 Page 5 ...

Страница 6: ...e Head and Local front panel includes twin 7 segment displays for channel indication and several buttons for UP DOWN channel selection SEND button AUX button POWER on off button plus Volume and Mute controls Power TX RX indication LEDS For those considering using a Phillips FM900 series for amateur radio and are confused by the band codes used the Philips FM900 series band plan is as follows E Ban...

Страница 7: ... changeable from the front panel The remote head also has a built in speaker This is the most common FM900 series radio The FM93 is the low end 10 channel baby It has channel up aux and send buttons analogue mute and volume The display is a single seven segment green LED display It only came in a local head version and differs considerably from the other FM900 series radios in that it s a servery ...

Страница 8: ...s lightly in their respective holes Then while maintaining a little pressure on the screw unscrew slightly until a click is felt then tighten most of the way Repeat for all screws then go around and finally tighten them all This avoids second starting cross threading which is otherwise easily achieved Miscellaneous intermittent problems caused by dry Joints As mentioned previously these units have...

Страница 9: ...plughole or any container with warm water and detergent If fitted remove the mounting bracket from the control unit and throw the bits in the sink If the microphone connects to the front of the unit directly under the PWR switch prise it straight off towards you Remove the vol and mute knobs from the front panel Just pull them straight off Throw them in the sink Flip the unit over and undo the fou...

Страница 10: ...lace the circuit boards into the front panel ensuring that o the three LEDs and five buttons fit properly into their respective holes o the white bracket between the circuit boards is correctly positioned for the mounting screws to locate correctly o the hard wired microphone cable if fitted is correctly positioned o the speaker wires are not caught up Replace the screws holding the circuit boards...

Страница 11: ... 53 250Mhz Voice 31 53 275Mhz 53 275Mhz Voice 32 53 300Mhz 53 300Mhz Voice 33 53 325Mhz 53 325Mhz Voice 34 53 350Mhz 53 350Mhz Voice 35 53 375Mhz 53 375Mhz Voice 36 53 400Mhz 53 400Mhz Voice 37 53 425Mhz 53 425Mhz Voice 38 53 450Mhz 53 450Mhz Voice 39 53 475Mhz 53 475Mhz Voice 40 53 500Mhz 53 500Mhz Voice 41 53 525Mhz 53 525Mhz Voice 42 53 550Mhz 52 550Mhz Repeater NSW Albury Lismore Vic Melbourne...

Страница 12: ...ce Reverse for Repeater 49 68 52 750Mhz 53 750Mhz Voice Reverse for Repeater 50 69 52 775Mhz 53 775Mhz Voice Reverse for Repeater 51 70 52 800Mhz 53 800Mhz Voice Reverse for Repeater 52 71 52 825Mhz 53 825Mhz Voice Reverse for Repeater 53 72 52 850Mhz 53 850Mhz Voice Reverse for Repeater 54 73 52 875Mhz 53 875Mhz Voice Reverse for Repeater 55 74 52 900Mhz 53 900Mhz Voice Reverse for Repeater 56 75...

Страница 13: ...eeded Stanley Knife or Scapple or Box Cutter Tin snips if needed Pair of small tweezers Engraver with grinder if needed Hot glue gun if needed 12 volt meter if needed Small plastic GLAD bag for holding screws A4 plastic GLAD bag for holding covers Can of WD40 Mr Sheen Armour all or similar 1cm or 2cm paint brush for cleaning Sponge or cloth for cleaning Masking Tape for cleaning Tooth brush for cl...

Страница 14: ... 18 pF RC5315 R2241 3 of 33 pF 3 of 33 pF RC5318 R2247 2 of 47 pF RC5320 R2251 4 of 56 pF 4 of 56 pF RC5321 R2253 2 of 68 pF RC5322 R2257 5 of 82 pF 3 of 82 pF RC5323 R2259 1 of 100 pF RC5324 R2259 3 of 120 pF 3 of 120 pF RC5325 R2287 1 of 220 pF RC5328 R2293 1 of 270 pF 1 of 270 pF RC5329 R2295 NOTE We will cover the Equipment Required at the night of the first lecture so do not purchase anything...

Страница 15: ...OM 21 4 MHz IF 6mtest3l bin Local Head Test EPROM 10 7 MHz IF 6mtest4r bin Remote Head Test EPROM 21 4 MHz IF Check under one of the top or bottom covers for the list of frequencies that was used originally by the transceiver Switch on Transceiver and check that it works ok ie lights work mute works etc Go to the nearest Mhz of one of the frequencies 68 88 Mhz Go to the channel Number for that Mhz...

Страница 16: ...d automatically backs off the output power Setting the output power trimmer pots on the control PCB too low or the 25W set trimmer in the PA too low will also bring up the red dot I can t remember precisely but low battery voltage and out of lock VCO may also turn on the red dot In any case I d take a close look at the 13 8 volt supply voltage and current because it could be a cooked power supply ...

Страница 17: ... if you intend to keep all of your speaker leads standard as a 3 5mm socket Remove 5pin din socket from rear of chassis Replace with flat piece of metal or similar material approximately 20mm by 30mm Mark mounting holes from removed 5 pin din socket mounting points Mark center from above two marked holes Drill 2 holes the outer two for the two mounting screws Drill 1 hole in center to hold 3 5mm s...

Страница 18: ...d from the front To swing boards upright to allow access to the component side unscrew the screws on the blank side of the boards that have an arrow pointing to those screws The screws do not screw all the way out The RF Board has normally 6 screws to undo for the board to swing out The Synthesiser Board has normally 4 screws to undo for the board to swing out Philips FM92E Conversion to 6 Meters ...

Страница 19: ...Synthesiser Board Philips FM92E Conversion to 6 Meters Version 3 9 Page 19 ...

Страница 20: ...EPROM socket For testing the FM92E Transceiver from 68 88 MHz EPROM notch points away from hinges of Synthesiser board Apply 12 Volts to the FM92E Transceiver Check that audio emanates from the speaker With a Signal Generator check that FM92E receiver mute works under 4 micro Volt on test frequency and note this reading Connect VHF Power Meter and press PTT button so a power out is registered on t...

Страница 21: ... See below for pictures of Synch board top bottom where to place EPROM Synthesiser Board Bottom View Philips FM92E Conversion to 6 Meters Version 3 9 Page 21 ...

Страница 22: ...Synthesiser Board Top View with cans on Synthesiser Board Top View with cans off Philips FM92E Conversion to 6 Meters Version 3 9 Page 22 ...

Страница 23: ...you with one of their hands With left hand pick up soldering iron and place onto the side of the pin to be extracted then with the right hand feed solder onto the pin ensure solder flows around pin then Keep the left hand soldering iron on the side of the pin and pick up the de soldering iron with the right hand and place over the pin to be extracted With a foot left or right press the suction vac...

Страница 24: ...mall tin can with an air tight lid Cover the rosin in the jar or can with methylated spirits Apply the air tight lid and allow to dissolve If the final solution is too thick then thin with more methylated spirits If the final solution is too thin then thicken by adding more rosin Apply to the surface to be de soldered with a small brush old toothbrush or icy pole stick We have found that a wooden ...

Страница 25: ... on the Receiver board Note VFO below should be VCO Receiver Board bottom view NOTE You must determine what IF your FM92E is using This will determine how to wind the VCO Main coil The IF frequency is normally located on the side panel of the VCO under RF BW It will be either 10 7 or 21 4 MHz In the following examples the 10 7 MHZ 21 4 MHz coils are the same Philips FM92E Conversion to 6 Meters Ve...

Страница 26: ...Receiver Board Philips FM92E Conversion to 6 Meters Version 3 9 Page 26 ...

Страница 27: ...ug Juice onto each pin to be de soldered When you have removed the VCO module with an old tooth brush clean the Receiver PCB with methylated spirits Then make sure that the VCO ceramic PCB pin holes are clear if they are not then de solder them clear Then re brush with methylated spirits Note the IF frequency 21 4MHz in the photo above 2 Once the module is free of the board put the radio to the si...

Страница 28: ... or some other device to hold the module whilst this is happening it will be far too hot to touch I used a large flat bladed screw driver inserted on the other side of the center post between the ceramic board and the VCO module case Then gently twisting the screwdriver as the heat flows into the solder connection between the center post and the ceramic board Remember gently twist the screwdriver ...

Страница 29: ...o be wound tightly and be aligned as per the old one you may have to distort the ends of the coils to fit them back through the holes You should remove the enamel coating on the wire and pre tin the wire with solder before fitting this will ensure a good electrical connection for the coils If the IF frequency is 10 7 MHz then wind a new one of 8 turns using wire 150 mm of enamel coated wire 0 63mm...

Страница 30: ...r which way the coil was wound Scrape off old glue from former with scalpel and fine file If the IF frequency is 21 4 MHz then rewind with 8 turns of same size of wire 150 mm length 0 63mm or 146mm of Leon s enamel coated wire 0 mm The same way as the old offset coil If the IF frequency is 10 7 MHz then rewind with 8 turns of same size of wire 150 mm length 0 63mm or 146mm of Leon s enamel coated ...

Страница 31: ...You have two options from this point on The first method is the traditional one where the VCO PCB is replaced into the VCO module the side of the module is affixed then the VCO module including the VCO PCB with coils are fitted back to the Receiver Board This method is probably the best for mobile operations however if you intend to use your FM92E converted to 6 meters then the second method is ea...

Страница 32: ...ew coils back into the module 7 When the board has been re fitted and you are comfortable with the solder joints to the module refit the cover by sweating the solder around the joints and slowly work your way around the edge Be careful to overheat the case as the internal board may come loose 8 Now you need to remount the module back to the board Carefully fit the pins back through the holes and r...

Страница 33: ... picture below VCO Module Case Modified 7 Clean the receiver board where the VCO PCB plugs in with mentholated spirits and a tooth brush If the holes are not clear clear with a solder sucker solder wick etc 8 Plug in VCO PCB into the Receiver Board and check that it is upright Solder the VCO PCB to the board Check that the soldering is ok Clean the back of the receiver board with mentholated spiri...

Страница 34: ...rn back here 11 Place VCO module over VCO PCB which has been soldered into receiver board Do this gently 12 Screw VCO module to Receiver board with the two screws 13 The tuning will have changed when you replace the VCO module can So continue on with VCO Tune on next page Philips FM92E Conversion to 6 Meters Version 3 9 Page 34 ...

Страница 35: ...hen that will even be better Set the radio to the highest frequency channel 59 set the multimeter to a 12 volt DC range and with a plastic or ceramic tuning tool adjust the core of the MAIN coil until you get a reading of around 11 7 Volts not above 12V When this has been achieved key the transmitter and adjust the core of the OFFSET coil until you get a matching voltage reading When satisfied tha...

Страница 36: ...E If the VCO will not tune properly or the transmitter side will not come within voltage range then check that pin 19 of the VCO module is 0 Volts on receive and 10 Volts on transmit VCO Tune Check References Ch Rx Freq Injection Frequency VCO Voltage 21 4MHz 10 7MHz Rx Tx 3 70 000MHz 80 7MHZ 5 3v 4 7V Not Converted 10 77 000MHz 98 4MHz 9 6V 12 0V Not Converted 20 53 000MHz 74 4MHz 20 53 000MHz 63...

Страница 37: ...21 Rx RF Amp Mixer Change Rx Mixer Coil Side Rx Mixer PCB Side Rx Mixer PCB Side Philips FM92E Conversion to 6 Meters Version 3 9 Page 37 ...

Страница 38: ...t coil Move coil slug to center of coil Remove by unsoldering antenna input wire and wire going to ground at top of coil former Gently remove former from housing Pry off bottom 1 cm of wire remove enamel from that 1cm of wire Cut enamelled wire 0 125mm to 250mm length remove enamel from that 1cm from one end of wire Solder two pieces of wire Wind additional 12 turns of wire onto coil former in sam...

Страница 39: ...tal of 54 turns When 12 turns completed hold down wire with glue from hot glue gun Cut wire at the 12 turn mark just added Or strip all wire wind on 54 turns Earth bottom of coil With tap 2 turns from earth Coil 4 This is RF amplifier 1st output bandpass coil Move coil slug to center of coil Remove wire going to ground at top of coil former Gently remove former from housing Pry off bottom 1 cm of ...

Страница 40: ...wire from RF amplifier input RF amplifier output plus mixer input and antenna input Move coil ferrites to middle of coil formers Gently remove all coils from block Strip all wire from all coils and keep the wire previously stripped Clean coil tops bottoms plus clean module coil inserts from old glue File down and clean all earth connections on block Philips FM92E Conversion to 6 Meters Version 3 9...

Страница 41: ...Original Rx Coils Cut out 50 of the two partitions between coil 1 coil 2 Plus between coil 3 coil 4 With a pair of tin snips Philips FM92E Conversion to 6 Meters Version 3 9 Page 41 ...

Страница 42: ...f 160mm of 0 8mm enamel coated wire After cutting wire lengths clean off all enamel from two ends of wire one end of 5mm in length cleaned the other earth end 10mm to be cleaned Solder both ends of 0 8mm wire Bend 8mm of the 0 8mm wire at 10mm tinned end at right angles Philips FM92E Conversion to 6 Meters Version 3 9 Page 42 ...

Страница 43: ...onto former With the 33mm of the original wire which has been soldered to the earth end of the 0 8mm wire Wind 1 5 turns of from earth connection in same direction as 0 8mm wire solder other end of the original wire to the antenna input Solder a 33pf capacitor across the 7 turns of 0 8mm wire Capacitor goes under coil via left If you are conducting this conversion remote to the club then check wit...

Страница 44: ...ar PCB side of Rx Module Use a pair of tweezers to help you see solder points on page 28 on Coil 3 Wind coil 3 the same as coil 1 with the exceptions of The original wire length is 50mm for coil 3 With free end of the original wire solder to the amplifier output on the PCB side of the Rx Module Push one end of the bent 0 8mm wire through a right hand hole of the square end of the coil former for e...

Страница 45: ...l Place into coil position 4 of Rx module Solder original wire to RF mixer input connection on rear PCB side of Rx Module Use a pair of tweezers to help you see solder points on page 28 NOTE A GDO should not be necessary if you are using 0 8mm enamelled coated wire and a NPO 33 pF capacitor However if you are using different dimensioned wire or a different sized capacitor then you should check eve...

Страница 46: ... solder the sides on of the Receiver Module with a signal generator and receiver or spectrum analyser you can check that the Rx amplifier is amplifying by setting up a test jig Rx Module Test Jig Earth pins 1 6 of RF Amplifier side of RX Module Be very careful of module pins they can easily break when soldering wire to them Apply a 10 Volt supply to pin 4 of the RF Amplifier Connect a 53 25 MHz si...

Страница 47: ... earthed to the module Disconnect original wire from Coil 4 to the Mixer Input pin on the Mixer PCB Connect the removed wire to a 53 25 MHz receiver or Spectrum Analyser Check that the RF amplifier is working See Below Philips FM92E Conversion to 6 Meters Version 3 9 Page 47 ...

Страница 48: ...gnal generator Adjust the RF coil for the best signal to noise ratio Keep the signal generator at the threshold of noise during the adjustment This adjustment should result in the mute lifting for a signal above 0 5 uVolts Philips FM92E Conversion to 6 Meters Version 3 9 Page 48 ...

Страница 49: ...ve 2 13 8 Volts Yellow 3 10 Volts Transmitter Orange 4 10 Volts PA Red 5 RF Monitor Bare Wire 6 Rx to Receiver amplifier input Coax 7 Tx PA input from VCO Buffer Coax 25 mW In 50 ohms 8 Tx PA output Top Left Corner Bare Wire 25 W output 50 ohms Philips FM92E Conversion to 6 Meters Version 3 9 Page 49 ...

Страница 50: ...FM91E PA Board above view Philips FM92E Conversion to 6 Meters Version 3 9 Page 50 ...

Страница 51: ...5 MHz The approximately 65Mhz is the injection frequency which goes to the receiver mixer Above is a spectrum analysis of the signal from the FM92E Synthesiser VCO Buffer Output pin 18 to the transmitter board input via coax with the Press To Talk key ON ie the transmitter was keyed Note the harmonics of the originating approximately 52Mhz frequency Philips FM92E Conversion to 6 Meters Version 3 9...

Страница 52: ...Philips FM92E Conversion to 6 Meters Version 3 9 Page 52 ...

Страница 53: ...ear of PA Board Unsolder RF output wire from PA Board Unsolder five of wires from chassis feed through pins Unsolder two of coax lines going to PA board from PA board Unscrew screws holding PA board to chassis Philips FM92E Conversion to 6 Meters Version 3 9 Page 53 ...

Страница 54: ...Philips FM92E Conversion to 6 Meters Version 3 9 Page 54 ...

Страница 55: ...Philips FM92E Conversion to 6 Meters Version 3 9 Page 55 ...

Страница 56: ...103 2 5 3 5 0 63mm L104 2 5 3 5 0 63mm L105 0 75 1 0 0 63mm L106 No change L107 No change L108 8 5 10 5 0 80mm L109 2 5 3 5 0 80mm L110 1 0 1 5 0 80mm L111 No change L112 No change L113 No change L114 2 5 0 80mm L115 1 0 1 5 0 80mm L116 2 5 3 5 0 80mm L117 No change L118 6 5 0 80mm L119 5 5 6 5 0 80mm L120 4 5 5 5 0 80mm L121 5 5 5 5 0 80mm L122 5 0 0 63mm Philips FM92E Conversion to 6 Meters Vers...

Страница 57: ...itor Replacement C101 220 pF 270 pF C102 68 pF 82 pF C107 100 pF 120 pF C108 82 pF 100 pF C111 68 pF 82 pF C112 82 pF 120 pF C117 47 pF 56 pF C118 180 pF 220 pF C119 68 pF 82 pF C126 47 pF 56 pF C130 27 pF 33 pF C135 39 pF 47 pF C136 39 pF 47 pF C139 27 pF 33 pF C140 47 pF 56 pF C141 15 pF 18 pF C142 47 pF 56 pF C143 27 pF 33 pF Add the following capacitors across the original capacitors ie 2 capa...

Страница 58: ...Above is PA Board left section at bottom of Screen New Capacitors Above is PA Board right section at bottom of Screen New Capacitors Philips FM92E Conversion to 6 Meters Version 3 9 Page 58 ...

Страница 59: ...Remove the 50K ohm potentiometer and replace with a 100K ohm potentiometer The original FM92E transceiver converted to 6 meters lacked deviation adjustment and for those who know the circuit this increases the loop gain of the exciter Philips FM92E Conversion to 6 Meters Version 3 9 Page 59 ...

Страница 60: ... maximum power Check the supply current is less than 6 5Amps What you want is maximum power for least current If you have a deviation meter connect it and speaking very loudly into the microphone counting to 10 adjust R367 for a maximum of 5khz If you have a channel programmed as low power the adjustment is R403 Philips FM92E Conversion to 6 Meters Version 3 9 Page 60 ...

Страница 61: ...oint which is in the middle 6th pin from either end ie resistor R254 It also can be found on the receiver board the smaller of the two hinged boards With the board in a vertical position the only way to see the components the resistor is located in the bottom right corner It is the closest resistor to SK203 a ribbon cable termination device The resistor is mounted vertically and has a value of 1 5...

Страница 62: ... scan inhibit with microphone off hook Precautionary note We are informed that this mod will disable some functions such as CTCSS etc Normally the FM92E will not go into scan mode unless the microphone is in its cradle A magnet in the cradle latches a reed switch in the microphone housing to enable the scan feature To enable scanning without hanging up the microphone locate SK405 at the hinge end ...

Страница 63: ...n Warning Do not make large adjustments here as you could cause over deviation 29 Fixing tinny transmit modulation by microphone modification Some FM 900 s sound fine on air some have a quite tinny sound Another way to fix this is to replace the standard microphone insert with an electret insert available from various electronics suppliers 30 Fixing tinny transmit modulation by microphone modifica...

Страница 64: ... Range Signaling Selcall Option Spacing Stability Hardware System 0 10 ppm STD STD STD Standard none No S Call 1 5ppm CTSS CCIR Rev Tone Xtal Heater Enc Only Burst 2 SimPlex E CTSS ZVIE ENC DEC 3 B Local SelCall EEA Type 1 20 25 30 No CTSS 4 A Remote CTSS ENC EIA Ignition 20 25 30 SelCall T1 Blanker 5 T 2 5ppm CTSS ENC DEC I O Exp TXCO Kit SelCall T1 No S Call 6 U SelCall CCIR T2 Type 2 ENC Only N...

Страница 65: ...5 Pinout are as viewed from rear of plug Handset Microphone Socket 1 Cradle 2 Power Ground 3 Mike Ground 4 Speaker 5 Mike Active 6 RX Audio out 7 PTT 8 Not used Pinout are as viewed from rear of plug 33 15 Pin Cable Philips FM92E Conversion to 6 Meters Version 3 9 Page 65 ...

Страница 66: ...ble then change the device General Notes Anytime that the lids are off an FM 900 then check the condition of C 432 and C439 10uF 50v electrolytics in the Voltage doubler circuit on the Logic board This part of the circuit supplies about 17 volts to the P L L circuit this voltage eventually being used as the Steering voltage to control the frequency of the V C O All manner of strange symptoms can b...

Страница 67: ...his repair is definitely worthwhile compared to parting with the hard earned for a new module if you can even source one now Other problems that can occur include the flexible printed circuits that join the circuit boards at the front of the radio becoming intermittent especially in early model radios that used paper insulated flexible P C s If they are in a bad way they can be replaced with ordin...

Страница 68: ... about 21db the 3db point 9db gain is at about 110Hz the 3db point 15db gain is at about 3 6kHz This explains the tinny sound Without the electrolytic you get a reasonably flat response with 12db gain ___ 100 1kHz 10kHz at 100Hz the gain is 8 7db at 1kHz the gain is 12db at 10kHz the gain is 12db the 3db point 9db is at about 110Hz So to make an FM92 sound better 1 Remove the 4 7uF electrolytic ca...

Страница 69: ...he 4 screws holding the shield over the EPROM its the larger one Earth yourself to the radio with one hand or use a anti static wrist strap Carefully remove the EPROM Its the chip with a paper label on it noting its position If you don t have a IC tool carefully lever it up with a screw diver at each end Re insert the EPROM with your new frequencies Carefully power up the radio and see if the chan...

Страница 70: ...adjusted the dot in the display should not stay on after the TX is released If you re lucky it won t come on at all You may have to turn the set on and off to reset the dot To adjust the receiver front end inject a 1 khz tone of 5khz deviation 2 5khz deviation for narrow band sets at your centre frequency and adjust the tuning slugs starting at L1 the slug in the centre of the board through to L6 ...

Страница 71: ...the set opens If the level to make it open is anything less than 5uV well done If its less than 3uV go and buy a lottery ticket If not repeat steps 2 to 5 until it does PA adjustment Open up the lid on the PA stage other side of the radio and adjust R102 the only pot in the PA for maximum power Key the radio and adjust C111 and C124 for maximum power Check the supply current is less than 6 5Amps W...

Страница 72: ...local control 25 0 KHz Channel Spacing 21 4MHz IF 4 remote control 25 0 KHz channel spacing 21 4MHz IF 5 local control 12 5 KHz Channel Spacing 10 7MHz IF 6 remote control 12 5 KHz Channel Spacing 10 7MHz IF 7 local control 12 5 KHz channel spacing 21 4MHz IF 8 remote control 12 5 KHz channel spacing 21 4MHz IF E Mechanical Construction 0 standard 1 extended temperature 5ppm crystal heater 2 water...

Страница 73: ...de for a FM92E with remote head for 6 Meters 110404200000000 A Channel Display 0 intermittent display 1 continuous display 2 intermittent 8 hour timer auto power off 3 continuous display 8 hour timer B Mute 0 fixed with defeat 1 variable with defeat 2 fixed no defeat 3 variable no defeat C Economiser Options D Tx Timer 0 Off 1 1 minute 2 3 minutes 3 5 minutes 4 10 minutes E Tx Inhibit 0 Off 1 Tx i...

Страница 74: ...ut the correct hardware being installed at the hardware code and the like will cause error messages This applies to things like selcall setups etc TX inhibit cannot be selected with Community repeater Tone periods 33 20 ms are incompatible with type 2 selcall Voting cannot be selected with mute defeat Selcall decode in software code must 00 if encode 03 or 07 Selcall encode 04 08 with decode 00 is...

Страница 75: ...repeater select tone Z Notes on FPP Version 3 0 altered Normally FPP will restrict programming of the radio in two ways first transmission and reception was fixed within the one band ie If you had a U band radio 450 to 470 MHz you could not program in any frequency for outside this band In this altered version of FPP however this restriction is lifted Bear in mind that the VCO has its limits howev...

Страница 76: ...pulse If this does not work then try Vpp 21V write pulse 1ms 20 pulses per byte final pulse 0 EPROM multi pulse If this does not work then try Vpp 21V write pulse 50ms 1 pulse per byte final pulse 0 standard EPROM single pulse If this does not work then try Vpp 25V write pulse 50ms 1 pulse per byte final pulse 0 standard EPROM single pulse When comparing binary files using DOS command FC don t for...

Страница 77: ...L bin Local Head Test EPROM 21 4 MHz IF 6Mtest4R bin Remote Head Test EPROM 10 4 MHz IF Channel Frequency 1 68 Mhz 2 69 Mhz 3 70 Mhz 4 71 Mhz 5 72 Mhz 6 73 Mhz 7 74 Mhz 8 75 Mhz 9 76 Mhz 10 77 Mhz 11 78 Mhz 12 79 Mhz 13 80 Mhz 14 81 Mhz 15 82 Mhz 16 83 Mhz 17 84 Mhz 18 85 Mhz 19 86 Mhz 20 87 Mhz 21 88 Mhz Philips FM92E Conversion to 6 Meters Version 3 9 Page 77 ...

Страница 78: ...the VCO lightly as it possible to distort the case Now heat the VCO using a hot air gun on high Use an ordinary heat gun the type used for paint stripping available from most hardware stores You ll have one for shrinking heat shrink tube anyway Aim the gun at the VCO at an angle from underneath and at the side away from the pins This is done to minimise heating of the board Gently touch the pins w...

Страница 79: ...40 6 Meter Antenna Philips FM92E Conversion to 6 Meters Version 3 9 Page 79 ...

Страница 80: ...h lead from transceiver then connect this section via fuse to the positive section of the red wire from the transceiver This can be done before EPROM can removal Solder 12 Volt black cable power cable onto the earth lead from the transceiver red with black dashes and red onto end of fuse This can be done before EPROM can removal Plug in Test EPROM 6mtest1l bin 6mtest2r 6mtest3l or 6mtest4r see pag...

Страница 81: ...ad the document pages from sections 19 20 of file 6m_con pdf or from the directory D FM92E Conversion to 6 meters of the main computer in the operations room Do VCO Change See section 19 20 starting on page 20 of this document 24th April 2007 Continue with week 17th April 2007 01th May 2007 Video Movie on climate change To give Leigh a rest for his eyes 08th May 2007 Start Receiver Mixer Module ch...

Страница 82: ...31st July 2007 Continue with week 12th June 2007 Philips FM92E Conversion to 6 Meters Version 3 9 Page 82 ...

Страница 83: ...42 Philips FM91 Schematic Diagrams Philips FM92E Conversion to 6 Meters Version 3 9 Page 83 ...

Страница 84: ... VK3RTN NE Vic Operational QF22 Oct99 Mt Gordon Marysville 80 km NE Melb linked to VK3RAG 146 775 and VK3RAD 438 525 VK3RAD RAG has 123 Hz CTCSS access 53 700 52 700 VK2RGN Goulburn Operational QF45 Feb 2007 idents every 10 mins split site 53 700 52 700 VK4RGY Sunshine Coast Operational QG63 Feb 2007 Maroochydore 50w 53 725 52 725 VK4RGA Gladstone Operational QG56 Dec 2006 53 725 52 725 VK4RIK Cai...

Страница 85: ... 52 925 VK4RBX The Knobby unknown 53 925 52 925 VK8RDX Darwin defunct scappped Jan 2007 CTCSS 123 Hz 53 950 52 950 VK4RBL Brisbane sth QG62 Bardon 53 975 52 975 VK3RGM Mt Buller NE Vic VK3RGM 53 975 and VK3RUG 438 175 are linked 53 975 52 975 VK4RBR Brisbane QG62 FM Voice simplex 52 525 International FM voice Call Freq everybody hangs out here 53 500 VK National FM voice Call Freq nobody uses this...

Страница 86: ...ion added tooth picks to de soldering section 3 9 VCO change coil placement page 31 VCO change unsoldering coils page 30 VCO change Removing glue from coil formers page 30 VCO change Scrape off old glue from former with scalpel and fine file page 30 VCO change or 146mm of Leon s enamel coated wire 0 mm page 30 VCO change Don t forget to use a hot glue gun or page 30 VCO test check with signal gene...

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