VERTEX STANDARD CO., LTD. 4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan VERTEX STANDARD Quad Band FM Transceiver US Headquarters 10900 Walker Street, Cypress, CA 90630, U.S.A. International Division 8350 N.W. 52nd Terrace, Suite 201, Miami, FL 33166, U.S.A. FT-8900R Technical Supplement © 2002 VERTEX STANDARD CO., LTD. (EH008M90A) YAESU EUROPE B.V. P.O. Box 75525, 1118 ZN Schiphol, The Netherlands YAESU UK LTD. Unit 12, Sun Valley Business Park, Winnall Close Winchester, Hampshire, SO23 0LB, U.K. VERTEX STANDARD HK LTD. Unit 5, 20/F., Seaview Centre, 139-141 Hoi Bun Road, Kwun Tong, Kowloon, Hong Kong 1 2 VOL SQL 4 5 SQL KEY2 PWR VOL 3 LOW V/M HM SCN 6 LOW V/M HM SCN 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. Contents Specifications .................................................... 2 Exploded View & Miscellaneous Parts ........ 3 Connection Diagram ........................................ 4 Circuit Description ........................................... 5 Alignment ........................................................ 11 Board Unit (Schematics, Layouts & Parts) Main Unit ..................................................................... 17 Panel Unit ..................................................................... 47 Panel-Sub Unit ............................................................. 53 VR-L Unit ..................................................................... 55 VR-R Unit ..................................................................... 56 1 Specifications GENERAL Frequency Range: 28.000 - 29.700 MHz, 50.000 - 54.000 MHz, 108.000 - 180.000 MHz, 320.000 - 480.000 MHz, 700 - 985 MHz (Cellular Blocked) TX: 28.000 - 29.700 MHz, 50.000 - 54.000 MHz, 144.000 - 146.000 MHz (or 144.000 - 148.000 MHz), 430.000 - 440.000 MHz (or 430.00 - 450.000 MHz) 5/10/12.5/15/20/25/50 kHz F3, F2, F1 50-Ohms, unbalanced (Antenna Duplexer built-in) ±5 ppm @ 14° F ~ +140° F (­10 °C ~ +60 °C) ­4° F ~ +140° F (­20 °C ~ +60 °C) 13.8 VDC (±15%), negative ground RX: 0.5 A (Squelched) TX: 8.0 A (50/430 MHz), 8.5 A (29/144 MHz) 5.5" x 1.6" x 6.6" (140 x 41.5 x 168 mm) (w/o knobs & connectors) 2.2 lb (1 kg) RX: Channel Steps: Modes of Emission: Antenna Impedance: Frequency Stability: Operating Temperature Range: Supply Voltage: Current Consumption (Approx.): Case Size (W x H x D): Weight (Approx.): TRANSMITTER Output Power: Modulation Type: Maximum Deviation: Spurious Radiation: Modulation Distortion: Microphone Impedance: DATA Jack Impedance: 50/20/10/5 W (29/50/144 MHz), 35/20/10/5 W (430 MHz) Variable Reactance ±5 kHz (50/144/430 MHz), ±2.5 kHz (29 MHz) Better than ­60 dB (29 MHz: Better than ­50 dB) Less than 3% 2 kW 10 kW RECEIVER Circuit Type: Intermediate Frequencies: Sensitivity (for 12dB SINAD): Squelch Sensitivity: Selectivity (­6dB/­60dB): Maximum AF Output: AF Output Impedance: Double-conversion superheterodyne 45.05 MHz/450 kHz (Left band), 47.25 MHz/450 kHz (Right band) Better than 0.2 µV Better than 0.16 µV 8 kHz/30 kHz (50/144/430 MHz), 6 kHz/30 kHz (29 MHz) 2 W @ 8 W for 5% THD 4-16 W Specifications are subject to change without notice, and are guaranteed within the 29, 50, 144, and 430 MHz amateur bands only. Frequency ranges will vary according to transceiver version; check with your dealer. 2 Exploded View & Miscellaneous Parts , , , , , , , , , , RA0415200 (x2 pcs) GROUND PLATE T9206228 WIRE ASSY , , CS1770001 CASE (W/O NYLON NET) RA02132A0 HIMERON TAPE M4090149 SPEAKER T9206438A WIRE ASSY R0150630 HOLDER MAIN UNIT ,, RA0446200 (x2 pcs) LEAF SPRING ,, ,,,, S5000206 FAN GUARD RA0441300 PAD M2090034A FAN RA0438700 RUBBER RA02668AA CHASSIS R0137550 COIL SPRING ... ... PANEL Unit RA0396900 (x2 pcs) INTER CONNECTOR RA026900A RELEASE KNOB , P1090984 CONNECTOR · · · , T9101509 CT CABLE RA040480A SUB PANEL ASSY (W/ COIL SPRING, RELEASE KNOB) VR-L Unit RA040470A FRONT PANEL ASSY RA0397100 REFLECTOR SHEET G6090147A LCD RA0396800 LCD HOLDER · RA0396100 REAR PANEL No. VXSTD P/N · U23116007 , U31206007 U44308002 ,, U03310002 ... U20308002 U20318007 DESCRIPTION QTY. TAPTITE SCREW M2X16B 4 OVAL HEAD SCREW M2.6X6B 14 TAPTITE SCREW M3X8NI 17 SEMS SCREW ASM3X10NI 4 BINDING HEAD SCREW M3X8NI 2 BINDING HEAD SCREW M3X18B 4 RA0404200 (x2 pcs) ENCODER KNOB RA0407200 SPACER T9207010A WIRE ASSY R6054387B (x2 pcs) SPECIAL NUT RA0404400 (x2 pcs) KNOB RA040710A LIGHT SHEET RA0396700 LIGHT GUIDE VR-R UNIT RA0397000 DIFFUSER SHEET PANEL-SUB UNIT RA0404300 (x2 pcs) KNOB Non-designated parts are available only as part of a designated assembly. 3 Connection Diagram 4 Circuit Description Receiver Signal Path "Left" Band 430 MHz Signal The 430 MHz signal is passed through a high-pass filter network and a low-pass filter network to the antenna switch diodes D1001/D1002 (both RLS135), then passed through another low-pass filter network to the "Left" band RF amplifier Q1001 (3SK296ZQ). The amplified 430 MHz signal is passed through the band switch D1008 (HSC277) to the varactor-tuned band-pass filter network consisting of D1009, D1010, D1011 (all HVC358B) and associated circuitry, then applied to the first mixer Q1004 (3SK296ZQ). Meanwhile, the UHF local signal from the UHF-VCO/A Q1112 (2SC5006) is delivered to first mixer Q1004, yielding the 45.05 MHz "Left" band first IF. The amplified 28 MHz signal is passed through a bandpass filter network and band switch diode D1028 (HSC277) to the first mixer Q1015 (3SK296ZQ). Meanwhile, the 28 MHz local signal from the RX50-29-VCO Q1121 is delivered to first mixer Q1012, yielding the 45.05 MHz "Left" band first IF. "Left" Band IF and AF Signals The 45.05 MHz "Left" band first local signal is delivered to the monolithic crystal filter XF1002 which strips away unwanted mixer products, then is passed through IF amplifier Q1019 (2SC4400) to the IF IC Q1024 (TA31136FN). Meanwhile, a portion of the output of 11.15 MHz crystal X1003 is multiplied fourfold by Q1027 (2SC4400) to provide the 44.6 MHz second local signal, then delivered to the IF IC Q1024. Within the IF IC Q1024, the 44.6 MHz second local signal is mixed with the 45.05 MHz "Left" band first local signal to produce the 450 kHz "Left" band second IF. The 450 kHz "Left" band second IF is passed through the filter switch D1033/D1034 (both DAN235E) to the ceramic filter CF1002 (CFWM450E) which strips away all but the desired signal, then it passes through the IF amplifier within Q1024 to the ceramic discriminator CD1002 (CDBM450C24), which removes any amplitude variations in the 450 kHz IF signal before detection of speech. The demodulated "Left" band audio is passed through the de-emphasis network, audio switch D1035 (DAN222), low-pass filter network (consisting of Q1034 (NJM2902V) and associated circuitry), and a high-pass filter network (consisting of Q1025 (NJM2092V) and associated circuitry). The filtered audio signal is passed through the audio volume control IC Q1042 (M511312FP), which adjusts the audio sensitivity to compensate for audio level variations, then is delivered to the audio switch Q1046 and Q1047 (both TC4W66FU). When the internal speaker is selected, the audio signal is amplified by Q1050 (TDA7233D) then applied to the internal loudspeaker. When the external speaker is selected, the audio signal is amplified by Q1045 (LA4425A), then it passes through the EXT SP jack to the external loudspeaker. "Left" Band 144 MHz Signal The 144 MHz signal is passed through a low-pass filter network and a high-pass filter network to the antenna switching relay RL1001 (G5A-237P), then passed through another high-pass filter network and low-pass filter network to the "Left" band RF amplifier Q1006 (3SK296ZQ). The amplified 144 MHz signal is passed through a varactor-tuned band-pass filter network consisting of D1019, D1020, D1021 (all HVC365) and associated circuitry to the first mixer Q1010 (3SK296ZQ). Meanwhile, the VHF local signal from the VHF-VCO/A Q1115 (2SC5374) is delivered to first mixer Q1010, yielding the 45.05 MHz "Left" band first IF. "Left" Band 50 MHz Signal The 50 MHz signal is passed through a low-pass filter network and antenna switching relay RL1003 (G5A-237P), then passed through another low-pass filter network, antenna switch relay RL1002 (G5A-237P), and band switch diode D1144 (HSC277) to yet another low-pass filter network, then applied to the "Left" band RF amplifier Q1006 (3SK296ZQ). The amplified 50 MHz signal is passed through a bandpass filter network and band switch diode D1027 (HSC277) to the first mixer Q1015 (3SK296ZQ). Meanwhile, the 50 MHz local signal from the RX50-29-VCO Q1121 (2SC5374) is delivered to first mixer Q1015, yielding the 45.05 MHz "Left" band first IF. "Right" Band 430 MHz Signal The 430 MHz signal is passed through a high-pass filter network and a low-pass filter network to the antenna switch diodes D1001/D1002, then passed through another low-pass filter network to the "Right" band RF amplifier Q1002 (3SK296ZQ). The amplified 430 MHz signal is delivered through the band switch D1008 (HSC277) to the varactor-tuned bandpass filter network consisting of D1004, D1005, D1006 (all HVC358B) and associated circuitry, then applied to the "Left" Band 28 MHz Signal The 28 MHz signal is passed through a low-pass filter network and antenna switching relay RL1003 (G5A-237P), then passed through another low-pass filter network, antenna switching relay RL1002 (G5A-237P) and band switch diode D1144 (HSC277) to yet another low-pass filter network, then delivered to the "Left" band RF amplifier Q1012 (2SC5374). 5 Circuit Description first mixer Q1003 (3SK296ZQ). Meanwhile, the UHF local signal from the UHF-VCO/B Q1106 (2SC5006) is delivered to first mixer Q1004, yielding the 47.25 MHz "Right" band first IF. Squelch Control "Left" Band When no carrier is being received on the "Left" band, noise at the output of the detector stage in Q1024 is amplified and band-pass filtered by the noise amp section of Q1024. The resulting DC voltage is delivered to pin 2 of main CPU Q1084 (M38268MCL), which compares the squelch threshold level to that which set by the front panel SQL knob. While no carrier is being received on the "Left" band, pins 43 and 45 of Q1084 remain "low," to disable the audio switch Q1046/Q1047, thus disabling the audio output from the speaker. "Right" Band 144 MHz Signal The 144 MHz signal is passed through a low-pass filter network and a high-pass filter network to the antenna switching relay RL1001 (G5A-237P), then passed through another high-pass filter network and low-pass filter network to the "Right" band RF amplifier Q1007 (3SK296ZQ). The amplified 144 MHz signal is passed through the varactor-tuned band-pass filter network consisting of D1016, D1017, D1018 (all HVC365) and associated circuitry to the first mixer Q1008 (3SK296ZQ). Meanwhile, the VHF local signal from the VHF-VCO/B Q1109 (2SC5374) is delivered to first mixer Q1008, yielding the 47.25 MHz "Right" band first IF. "Right" Band When no carrier is being received on the "Right" band, noise at the output of the detector stage in Q1018 is amplified and band-pass filtered by the noise amp section of Q1018. The resulting DC voltage is delivered to pin 5 of main CPU Q1084, which compares the squelch threshold level to that which set by the front panel SQL knob. While no carrier is being received on the "Left" band, pins 42 and 44 of Q1084 remain "low," to disable the audio switch Q1046 and Q1047, thus disabling the audio output from the speaker. "Right" Band IF and AF Signal The 47.25 MHz "Right" band first IF is delivered to the monolithic crystal filter XF1001 which strips away unwanted mixer products, then passed through the IF amplifier Q1017 (2SC4400) to the IF IC Q1018 (TA31136FN). Meanwhile, a portion of the output of 11.7 MHz crystal X1002 is multiplied fourfold by Q1026 (2SC4400) to provide the 46.8 MHz second local signal, then appl ...