FT8900R.pdf

1 Quad Band FM Transceiver FT-8900R Technical Supplement Introduction This manual provides technical information necessary for servicing the FT-8900R Transceiver. Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-qualified persons to service this equipment may result in permanent damage not covered by the warranty, and may be illegal in some countries. Two PCB layout diagrams are provided for each double-sided circuit board in the transceiver. Each side of thr board is referred to by the type of the majority of components installed on that side (“leaded” or “chip-only”). In most cases one side has only chip components, and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only. While we believe the technical information in this manual to be correct, Vertex Standard assumes no liability for damage that may occur as a result of typographical or other errors that may be present. Your cooperation in pointing out any inconsistencies in the technical information would be appreciated. Specifications . 2 Exploded View check with your dealer. Downloaded by? RadioAmateur.EU 3 Exploded View realignment should not be done until after the faulty component has been replaced. We recommend that servicing be performed only by au- thorized Vertex Standard service technicians who are ex- perienced with the circuitry and fully equipped for repair and alignment. Therefore, if a fault is suspected, contact the dealer from whom the transceiver was purchased for instructions regarding repair. Authorized Vertex Standard service technicians realign all circuits and make complete performance checks to ensure compliance with factory specifications after replacing any faulty components. Those who do undertake any of the following alignments are cautioned to proceed at their own risk. Problems caused by unauthorized attempts at realignment are not covered by the warranty policy. Also, Vertex Standard must re- serve the right to change circuits and alignment procedures in the interest of improved performance, without notify- ing owners. Under no circumstances should any alignment be attempt- ed unless the normal function and operation of the trans- ceiver are clearly understood, the cause of the malfunc- tion has been clearly pinpointed and any faulty compo- nents replaced, and the need for realignment determined to be absolutely necessary. Required Test Equipment The following test equipment (and thorough familiarity with its correct use) is necessary for complete realignment. Correction of problems caused by misalignment result- ing from use of improper test equipment is not covered under the warranty policy. While most steps do not re- quire all of the equipment listed, the interactions of some adjustments may require that more complex adjustments be performed afterwards. Do not attempt to perform only a single step unless it is clearly isolated electrically from all other steps. Have all test equipment ready before be- ginning, and follow all of the steps in a section in the or- der presented. ?Regulated DC Power Supply: adjustable from 10 to 17 VDC, 15 A ?RF Signal Generator with calibrated output level at 500 MHz ?Frequency Counter: 0.1 ppm accuracy at 500 MHz ?AF Signal Generator ?SINAD Meter ?Oscilloscope ?Spectrum Analyzer ?Deviation Meter (linear detector) ?AF Milivoltmeter ?AF Dummy Load: 8-Ohm, 5 W ?DC Voltmeter: high impedance ?Inline Wattmeter with 5% accuracy at 500 MHz ?50-Ohm non-reactive Dummy Load: 100 watts at 500 MHz ?VHF/UHF Sampling Coupler Set up the test equipment as shown for the transceiver alignment, and apply 13.8 VDC power to the transceiver. Alignment Preparation & Precautions A dummy load and inline wattmeter must be connected to the main antenna jack in all procedures that call for transmission, except where specified otherwise. Correct alignment is not possible with an antenna. After complet- ing one step, read the following step to determine wheth- er the same test equipment will be required. If not, re- move the test equipment (except dummy load and watt- meter, if connected) before proceeding. Correct alignment requires that the ambient temperature in the repair shop be the same as that of the transceiver and test equipment, and that this temperature be held constant between 68 C and 86 F (20 C 30 C). When the transceiver is brought into the shop from hot or cold air it should be allowed some time for thermal equaliza- tion with the environment before alignment. If possible, alignments should be made with oscillator shields and circuit boards firmly affixed in place. Also, the test equip- ment must be thoroughly warmed up before beginning. Notes: Signal levels in dB referred to in alignment are based on 0 dB = 0.5 V. QUAD BAND FM TRANSCEIVER FT-8900R Power Supply 13.8 VDC Pin 5 EXT SP Frequency Counter Deviation Meter Inline Wattmeter 50-ohm Dummy Load RF Sampling Coupler RF Signal Generator 8-ohm Dummy Load SINAD Meter AF Signal Generator 12 Alignment Entering the Alignment mode Alignment of the FT-8900R is performed using a front-panel software-based procedure. To perform alignment of the trans- ceiver, it must first be placed in the “Alignment Mode,” in which the adjustments will be made and then stored into memory. To enter the Alignment mode: 1.Press and hold in the “Left” band V/M key and the Hyper Memory 6 key while turning the radio on. Once the radio is on, release these two keys. 2.Press the front panel keys in the following sequence. “Left” band LOW ? “Left” band V/M ? “Left” band HM ? “Left” band SCN ? “Right” band LOW ? “Right” band V/M ? “Right” band HM ? “Right” band SCN. 3.You will now note the appearance of “A-0 REF.xxH” on the display, this signifies that the transceiver is now in the “Alignment” mode. PLL Reference Frequency (A-0 REF) 1.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Left” band. 2.Tune the “Left” band frequency to 52.050 MHz. 3.Press and hold in the in the “Right” DIAL knob, if needed, to set the Alignment parameter to “A-0 REF.xxH.” 4.Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the counter frequency reading is 52.050 MHz (10 Hz). 5.Press the “Right” DIAL knob momentarily to switch the “Main” band to be the “Right” band. 6.Tune the “Right” band frequency to 435.050 MHz. 7.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the counter frequency reading is 435.050 MHz (100 Hz). RF Front-end Tuning (A-1 TUN) 1.Connect the DC voltmeter to R1168 on the MAIN Unit, then inject a 439.050 MHz signal at a level of +10 dB (with 1 kHz modulation 3.5 kHz deviation) from the RF Signal Generator. 2.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band. 3.Tune the “Right” band frequency to 439.050 MHz. 4.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “A-1 TUN.xxH.” 5.Adjust the “Left” DIAL knob, as needed, so that the DC voltmeter reading is 1.1 V. 6.Tune the “Right” band frequency to 145.050 MHz. 7.Inject a 145.050 MHz signal at a level of +10 dB (with 1 kHz modulation 3.5 kHz deviation) from the RF Signal Generator. 8.Adjust the “Left” DIAL knob, as needed, so that the DC voltmeter reading is 1.2 V. 8.Press the “Left” DIAL knob momentarily to switch the “Main” band to be the “Left” band. 9.Connect the DC voltmeter to R1180 on the MAIN Unit. 10. Tune the “Left” band frequency to 439.050 MHz. 11. Inject a 439.050 MHz signal at a level of +10 dB (with 1 kHz modulation 3.5 kHz deviation) from the RF Signal Generator. 12. Adjust the “Right” DIAL knob, as needed, so that the DC voltmeter reading is 1.1 V. 13. Tune the “Left” band frequency to 145.050 MHz. 14. Inject a 145.050 MHz signal at a level of +10 dB (with 1 kHz modulation 3.5 kHz deviation) from the RF Signal Generator. 15. Adjust the “Right” DIAL knob, as needed, so that the DC voltmeter reading is 1.2 V. R1168 R1180 MAIN UNIT TEST POINTS 13 Alignment TX Power Output (A-2 PWR) 1.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band. 2.Tune the “Right” band frequency to 440.050 MHz, then set the Transmit Power Level to “LOW.” 3.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “A-2 PWR.xxH.” 4.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 5 Watts (0.5 Watt). 5.Increase the Transmit Power Level to “MID2.” 6.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 10 Watts (0.5 Watt). 7.Increase the Transmit Power Level to “MID1.” 8.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 20 Watts (0.5 Watt). 9.Increase the Transmit Power Level to “HIGH.” 10. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 35 Watts (0.5 Watt). 11. Tune the “Right” band frequency to 146.050 MHz, then set the Transmit Power Level to “LOW.” 12. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 5 Watts (0.5 Watt). 13. Press the “Left” DIAL knob momentarily to switch the “Main” band to be the “Left” band. 14. Tune the “Left” band frequency to 52.050 MHz, then set the Transmit Power Level to “MID2.” 15. Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the wattmeter reading is 10 Watts (0.5 Watt). 16. Tune the “Left” band frequency to 29.050 MHz, then set the Transmit Power Level to “MID2.” 17. Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the wattmeter reading is 20 Watts (0.5 Watt). 18. Increase the Transmit Power Level to “HIGH.” 19. Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the wattmeter reading is 50 Watts (0.5 Watt). TX Deviation (A-4 DEV) 1.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band. 2.Tune the “Right” band frequency to 440.050 MHz, then set the Transmit Power Level to “LOW.” 3.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “A-4 DEV.xxH.” 4.Inject a 1 kHz audio tone at a level of 80 mV from the Audio Generator. 5.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is 4.5 kHz (0.2 kHz). 6.Tune the “Right” band frequency to 146.050 MHz, then set the Transmit Power Level to “LOW.” 7.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is 4.5 kHz (0.2 kHz). 9.Press the “Left” DIAL knob momentarily to switch the “Main” band to be the “Left” band. 10. Tune the “Left” band frequency to 52.050 MHz, then set the Transmit Power Level to “LOW.” 11. Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the deviation meter reading is 4.5 kHz (0.2 kHz). 12. Tune the “Left” band frequency to 29.050 MHz, then set the Transmit Power Level to “LOW.” 13. Press the PTT switch to activate the transmitter, and adjust the “Right” DIAL knob, as needed, so that the deviation meter reading is 2.3 kHz (0.2 kHz). DCS Tx Deviation (A-5 DCS) 1.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band. 2.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “A-5 DCS.xxH.” 3.Tune the “Right” band frequency to 440.050 MHz, then activate DCS with the 023 DCS code, and set the Trans- mit Power Level to “LOW.” 4.Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is between 0.50 kHz and 0.60 kHz. 5.Tune the “Right” band frequency to 146.050 MHz, then activate DCS with the 023 DCS code, and set the Trans- mit Power Level to “LOW.” 6.Press the PTT switch to activate the transmitter (with no microphone input), adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is be- tween 0.50 kHz and 0.60 kHz. 7.Press the “Left” DIAL knob momentarily to switch the “Main” band to be the “Left” band. 8.Tune the “Left” band frequency to 52.050 MHz, then activate DCS with the 023 DCS code, and set the Trans- mit Power Level to “LOW.” 9.Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Right” DIAL knob, as needed, so that the deviation meter reading is between 0.65 kHz and 0.75 kHz. 10. Tune the “Left” band frequency to 29.050 MHz, then activate DCS with the 023 DCS code, and set the Trans- mit Power Level to “LOW.” 11. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Right” DIAL 14 knob, as needed, so that the deviation meter reading is between 0.35 kHz and 0.45 kHz. CTCSS Tx Deviation (A-6 CTC) 1.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band. 2.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “A-6 CTC.xxH.” 3.Tune the “Right” band frequency to 440.050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Transmit Power Level to “LOW.” 4.Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is between 0.65 kHz and 0.75 kHz. 5.Tune the “Right” band frequency to 146.050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Transmit Power Level to “LOW.” 6.Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is between 0.65 kHz and 0.75 kHz. 7.Press the “Left” DIAL knob momentarily to switch the “Main” band to be the “Left” band. 8.Tune the “Left” band frequency to 52.050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Transmit Power Level to “LOW.” 9.Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Right” DIAL knob, as needed, so that the deviation meter reading is between 0.65 kHz and 0.75 kHz. 10. Tune the “Left” band frequency to 29.050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Transmit Power Level to “LOW.” 11. Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Right” DIAL knob, as needed, so that the deviation meter reading is