VERTEX YAESU VX-7R Repair Service Manual

Specification ............................................................................................................................................ 2 Exploded View & Miscellaneous Parts ............................................................................................. 4 Block Diagram ........................................................................................................................................ 5 Interconnection Diagram ...................................................................................................................... 6 Circuit Description ................................................................................................................................ 7 Alignment .............................................................................................................................................. 11 Board Unit (Schematics, Layouts & Parts) RF Unit ............................................................................................................................................................................. 19 AF Unit ............................................................................................................................................................................ 33 CNTL Unit ....................................................................................................................................................................... 45 VCO Unit ......................................................................................................................................................................... 59 ©2003 VERTEX STANDARD CO., LTD. EH009M90B Technical Supplement VX-7R 50/144/430 MHz Triple-Band Heavy Duty Submersible Transceiver Introduction This manual provides the technical information necessary for servicing the VX-7R 50/144/430 MHzTriple-Band Heavy Duty Submersible Trans- ceiver. Servicing this equipment requires expertise in handing surface-mount chip components. Attempts by non-qualified persons to service this equipment may result in permanent damage not covered by the war- ranty, and may be illegal in some countries. Two PCB layout diagrams provided for each double-sided board in this transceiver. Each side of the board is referred to by the type of the majority of components installed on that side ("Side A" or "Side B"). In most cases one side has only chip components, and the other has either a mixture of both chip and leaded components (trimmers, coils, electro- lytic capacitors, ICs, etc.), or leaded components only. While we believe the information in this manual to be correct, VER- TEX STANDARD assumes no liability for damage that may occur as a result of typographical or other errors that may be present. Your coop- eration in pointing out any inconsistencies in the technical information would be appreciated. Contents DW VERTEX STANDARD CO., LTD. 4-8-8 Nakameguro, Meguro-Ku, Tokyo 153-8644, Japan VERTEX STANDARD US Headquarters 10900 Walker Street, Cypress, CA 90630, U.S.A. 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

2 Specifications General Frequency Ranges: Channel Steps: Frequency Stability: Emission Type: Antenna Impedance: Supply Voltage: Current Consumption: Operating Temperature: Case Size: Weight: Rx (MAIN): 0.5 - 1.8 MHz (BC Band) 1.8 - 30 MHz (SW Band) 30-59 MHz (50 MHz HAM: USA version) 30-76 MHz (50 MHz HAM: EXP version) 59-108 MHz (FM: USA version) 76-108 MHz (FM: EXP version) 108-137 MHz (Air Band) 137-174 MHz (144 MHz HAM) 174-222 MHz (VHF-TV) 222-225 MHz (220 MHz HAM: USA version) 225-420 MHz (ACT1: Action Band 1: USA version) 222-420 MHz (ACT1: Action Band 1: EXP version) 420-470 MHz (430 MHz HAM) 470-729 MHz (UHF-TV: USA version) 470-800 MHz (UHF-TV: EXP version) 800-999 MHz (ACT2: Action Band 2, cellular Blocked) Rx (SUB): 50 - 54 MHz 137 - 174 MHz 420 - 470 MHz Tx: 50 - 54 MHz (MAIN & SUB) 144 - 146 MHz or 144 - 148 MHz (MAIN & SUB) 222-225 MHz (MAIN, USA version) 430 - 440 MHz or 430 - 450 MHz (MAIN & SUB) 5/9/10/12.5/15/20/25/50/100 kHz ±5 ppm (+14°F to +122°F, –10°C to +50°C) F2, F3, A3 50-ohm Nominal: 7.4 V DC, Negative Ground Operating: 10 - 16 V DC, Negative Ground (EXT DC jack) 150 mA (Mono Band Receive) 200 mA (Dual Band Receive) 55 mA (Mono Band Receive, Standby, Saver Off) 100 mA (Dual Band Receive, Standby, Saver Off) 25 mA (Mono Band Receive, Standby, Saver On "Save Ratio 1:5") 50 mA (Dual Band Receive, Standby, Saver On "Save Ratio 1:5") 400 µA (Auto Power Off) 1.6/1.3/1.0/0.7 A (50 MHz, Tx HI/L3/L2/L1) 1.71.4/1.1/0.8 A (144 MHz, Tx HI/L3/L2/L1) 0.6 A (220 MHz, Tx) 1.8/1.5/1.2/0.9/ A (430 MHz, Tx HI/L3/L2/L1) –4°F to +140°F (–20°C to +60°C) 60 (W) x 90 (H) x 28 (D) mm (w/o knob & antenna) 250 g

3 Specifications are subject to change without notice, and are guaranteed within amateur bands only. Specifications Transmitter RF Power Output: Modulation Type: Maximum Deviation: Spurious Emission: Microphone Impedance: Receiver Circuit Type: Intermediate Frequencies: Sensitivity: Selectivity: AF Output: 5/2.5/1.0/0.5 W (50/144/430 MHz, FM) 0.3 W (220 MHz, FM) 1.0 W (50 MHz, FM) FM: Variable Reactance AM: Early Stage (Low Level) ±5/±2.5 kHz At least 60 dB below (@ Tx 1W) 2 k-ohm N-FM, AM: Double-Conversion Superheterodyne W-FM: Triple-Conversion Superheterodyne 1st: 47.25 MHz (N-FM, AM) 45.8 MHz (W-FM) 2nd: 450 kHz (N-FM, AM) 10.7 MHz (W-FM) 3rd: 1 MHz (W-FM) 3.0 µV for 10 dB SINAD (0.5 - 30 MHz, AM) 0.5 µV for 12 dB SINAD (30 - 50 MHz, N-FM) 0.16 µV for 12 dB SINAD (50 - 54 MHz, N-FM) 15 kHz/35 kHz (-6 dB/-60 dB: N-FM, AM) 200 kHz/300 kHz (-6 dB/-20 dB: W-FM) 200 mW @ 8 ohm for 10 % THD (@ 7.4V DC) 400 mW @ 8 ohm for 10 % THD (@ 13.8V DC)

4 Exploded View & Miscellaneous Parts SUPPLIED ACCESSORIES VXSTD P/N DISCRIPTION Q3000183 YHA-64 (depending on transceiver version) Q3000185 YHA-65 Q8101014 YHA-63 50MHZ ADAPTER L Q8101015 YHA-63 440MHZ ADAPTER S Q9000786 LI-ION BATTERY FNB-80LI Q9500087 NC-72A Q9500088 NC-72B (depending on transceiver version) Q9500089 NC-72C Q9500090 NC-72U RA029630A BELT CLIP S6000335 HAND STRAP ➀ ➀ ➁ ➁ ➁ ➁ ➃ ➄ ➂ ➂ ➂ ➂ RA0400000 RUBBER PACKING RA0417100 PANEL FRAME RA0399500 WINDOW RA0399400 DOUBLE FACE TAPE RA0401600 O RING RA0399800 LIGHT GUIDE (LED) RA0400100 RUBBER KNOB (PTT) RA0140100 MASK SHEET RA0399700 HOLDER (PTT) CP7342003 (SILVER) CP7342005 (BLACK) REAR CASE ASS’Y with SMA CONNECTOR ASS’Y, TERMINAL BOARD ASS’Y, RUBBER HOLDER (PTT), RUBBER KNOB (PTT) RA01403AA LATCH NAIL FNB-80LI RA0399900 REFLECTOR SHEET RA014250A DOUBLE FACE TAPE (LCD) RA0399100 LIGHT GUIDE (LED) Q7000426 LCD MODULE RA0405600 MIC HOLDER RUBBER CNTL-Unit RA0426800 O RING AF-Unit RA0400900 O RING RA0400200 STUD (X4 pcs) RA0426900 O RING RA0087900 SPECIAL NUT CP7346002 (USA, SILVER) CP7346003 (EXPORT, SILVER) CP7346004 (GERMANY, SILVER) CP7346006 (USA, BLACK) CP7346007 (EXPORT, BLACK) CP7346008 (GERMANY, BLACK) PANEL ASS’Y with RUBBER KNOB, MIC SHEET, SP SHEET, SP, PROTECTOR L, PROTECTOR R ➅ ➆ ➆ ➇ ➇ ➆ ➆ ➆ ➆ RA0292200 SPECIAL NUT ➈ ➈ ➈ ➈ ➉ ➉ RA0400500 EXT CAP RA0401200 ENCODER KNOB RA0401900 VOLUME KNOB RA0400600 CAP(SP/MIC) RA0141600 RUBBER PACKING There is a direction in WASHER. WASHER SCREW EXP CAP FR008330C FPC CABLE ➀ U9900137 BINDING HEAD SCREW M2X21.7 (W/ O RING) 2 ➁ U9900138 BINDING HEAD SCREW M2X5 (W/ O RING) 4 ➂ U07225120 PAN HEAD SCREW M2X2.5SUS#1 4 ➃ U9900136 SPECIAL SCREW M2X2.35 1 ➄ RA0304300 WASHER 1 ➅ U00103002 PAN HEAD SCREW M2X3NI 1 ➆ U00104002 PAN HEAD SCREW M2X4NI 6 ➇ U9900140 TAPTITE SCREW M2X6SUS#3 2 ➈ U44104002 TAPTITE SCREW M2X4NI 4 ➉ U9900141 TAPTITE SCREW M1.7X5NI#3 2 U07125102 TAPTITE SCREW M1.7X2.5SUS#1 2 P0091335 CONNECTOR (EXT DC) RF-Unit P1091150 CONNECTOR (MIC/SP)

5 Block Diagram

6 Interconnection Diagram

7 Circuit Description The VX-7R consists of a RF-UNIT, a CNTL-UNIT and an AF-UNIT. The RF-UNIT contains the receiver front end, PLL IC, power and switching circuits, and the VCO-UNIT for transmit and receive local signal oscillation. The CNTL- UNIT contains the CPU, and audio ICs, and the power circuitry for the LCD. The AF-UNIT contains the IF, and audio ICs. Receiver Signal Flow The VX-7R includes five receiver front ends, each op- timized for a particular frequency range and mode com- bination. (1) Triplexer Signals between 0.5 and 540 MHz received at the antenna terminal pass through a first low-pass filter composed of C1266, C1269, C1289, C1291, C1296, C1297, L1059, L1060, L1067 and L1068. Received 430-MHz signals, after passing through the low-pass filter, are fed to the UHF T/R switch circuit composed of diode switch D1048 (RLS135), D1051 (1SV307). Received 145-MHz signals, after passing through the low-pass filter, are fed to the VHF T/R switch circuit composed of diode switch D1053 (RLS135), D1054 (1SV307). Received 50-MHz signals, after passing through the low- pass filter, are fed to the 50MHz T/R switch circuit composed of diode switch D1058 (RLS135), D1059 (1SV307). (2) 145-MHz Band and 76-300MHz Reception Received signals between 76 and 300 MHz pass through the Triplexer circuit, low-pass filter/high-pass filter circuit, VHF T/R switch circuit and protector diode D1002 (1SS362) before additional filtering by a band-pass filter prior to application to RF amplifier Q1004 (2SC5555). The amplified RF signal is passed through a band-pass filter to first mixer Q1012 (2SC5555). Meanwhile, VHF output from the VCO-UNIT is amplified by Q1017 (2SC5374) and applied through diode T/R switch D1041 (DAN222) to mixer Q1012 as the first local signal. The 47.25-MHz intermediate frequency product of the mixer is delivered to the AF-UNIT. The TUNE voltage from the CPU on the CNTL-UNIT is amplified by DC amplifier Q3017 (NJU7007F2) and applied to varactors D1020 and D1022 (HVC369B), D1019, D1021, D1023, D1024, D1033 and D1036 (1SV325) in the variable frequency band-pass filters. By changing the electrostatic capacitance of the varactors, optimum filter characteristics are provided for each specific operating frequency. (3) 435-MHz Band and 222-540MHz Reception Received signals between 222 and 540 MHz pass through the Triplexer circuit, low-pass filter/high-pass filter circuit, UHF T/R switch circuit and protector diode D1001 (1SS362) before additional filtering by a band-pass filter prior to application to RF amplifier Q1003 (2SC5555). The amplified RF signal is passed through a band-pass filter, RF amplifier Q1006 (2SC5555) and band- pass filter to first mixer Q1011 (2SC5555). Meanwhile, UHF output from the VCO-UNIT is amplified by Q1016 (2SC5374) and applied through diode T/R switch D1045 (HN2D01FU) to mixer Q1011 as the first local signal. The 47.25-MHz intermediate frequency product of the mixer is delivered to the AF-UNIT. The TUNE voltage from the CPU on the CNTL-UNIT is amplified by DC amplifier Q3017 and applied to varactors D1005, D1018, D1030 and D1031 (HVC358B) in the variable frequency band-pass filters. By changing the electrostatic capacitance of the varactors, optimum filter characteristics are provided for each specific operating frequency. (4) 50-MHz-Band and 30-76 MHz Reception Received signals between 30 and 76 MHz pass through the Triplexer circuit, low-pass filter circuit, 50 MHz T/R switch circuit and protector diode D1003 (1SS362) before additional filtering by a band-pass filter prior to application to RF amplifier Q1005 (2SC5555). The amplified RF signal is passed through a band-pass filter to first mixer Q1008 (2SC5555). Meanwhile, 50 MHz output from the VCO-UNIT is amplified by Q1018 (2SC5374) and applied through diode T/R switch D1046 (HN2D01FU) to mixer Q1008 as the first local signal. The 47.25-MHz intermediate frequency product of the mixer is delivered to the AF-UNIT. The TUNE voltage from the CPU on the CNTL-UNIT is amplified by DC amplifier Q3017 and applied to varactors D1025 and D1026 (1SV325) in the variable frequency band-pass filters. By changing the electrostatic capacitance of the varactors, optimum filter characteristics are provided for each specific operating frequency. (5) 0.5 - 30 MHz Reception Received signals between 0.5 and 30 MHz pass through the Triplexer circuit, low-pass filter circuit, HF T/R switch circuit and protector diode D1003 before additional filtering by a band-pass filter prior to application to RF amplifier Q1009 (2SC4915-0). The amplified RF signal is

8 Circuit Description passed through a band-pass filter to first mixer Q1013 (2SC4915-0). Meanwhile, HF output from the VCO-UNIT is amplified by Q1018 and applied through diode T/R switch D1046 to mixer Q1013 as the first local signal. The 47.25-MHz intermediate frequency product of the mixer is delivered to the AF-UNIT. The TUNE voltage from the CPU on the CNTL-UNIT is amplified by DC amplifier Q3017 and applied to varactors D1013 (HVR100) in the variable frequency band-pass filters. By changing the electrostatic capacitance of the varactors, optimum filter characteristics are provided for each specific operating frequency. (6) 540 - 999 MHz Reception Received signals between 540 and 999 MHz pass through the high-pass filter circuit, T/R switch D1004 (1SV271) prior to application to RF amplifier Q1002 (2SC5277). The amplified RF signal is passed through a band-pass filter to first mixer Q1010 (2SC5277). Mean- while, UHF output from the VCO-UNIT is amplified by Q1016 and applied through diode T/R switch D1045 to mixer Q1010 as the first local signal. The 47.25-MHz intermediate frequency product of the mixer is delivered to the AF-UNIT. The TUNE voltage from the CPU on the CNTL-UNIT is amplified by DC amplifier Q3017 and applied to varactors D1015 and D1017 (HVC355B) in the variable frequency band-pass filters. By changing the electrostatic capacitance of the varactors, optimum filter characteristics are provided for each specific operating frequency. (7) 47.25-MHz First Intermediate Frequency The 47.25-MHz first intermediate frequency from the first mixers is delivered from the RF-UNIT to the AF-UNIT through jacks J1008 and J2001. On the AF-UNIT, the IF for AM and FM-narrow signals is passed through NAR/ WIDE switch D2001 (DAP222) and the 47.25-MHz mono- lithic crystal filter (MCF) XF2001 to narrow IF amplifier Q2002 (2SC4915-0) for input to pin 16 of the Narrow IF IC Q2016 (TA31136FN), after amplitude limiting by D2003 (DA221). Meanwhile, a portion of the output of 11.7-MHz crystal X1001 on the RF-UNIT is multiplied fourfold by Q2004 (2SC4915-0) and Q2012 (2SC4154E) to provide the 46.8- MHz second local signal, applied to the Narrow IF IC. Within the IC, this signal is mixed with the 47.25-MHz first intermediate frequency signal to produce the 450 kHz second intermediate frequency. This second IF is filtered by ceramic filter CF2002 (ALFYM450F=k) and amplified by the limiting amplifier within the Narrow IF IC before quadrature detection by ceramic discriminator CD2001 (CDBM450C7). Demodulated audio is passed from pin 9 of the Narrow IF IC through the "Mute" analog switch Q2029 (2SJ364) and squelch gate Q2036 (2SJ364) before de-emphasis at Q2028 (DTC144EE). The resulting audio is amplified by AF amplifier Q2040 (TDA7233D) and fed through the MIC/EAR jack J2002 to internal speaker SP1001 or an external earphone. (8) Squelch Control Signal components in the neighborhood of 15 kHz con- tained in the discriminator output pass through an active band-pass filter composed of R2059, R2060, R2062, C2076, C2078 and the operational amplifier between pins 7 and 8 within Narrow IF IC Q2016. They are then rectified by D2012 and D2013 (MC2850) to obtain a DC voltage corresponding to the level of noise. This voltage is fed to pin 49 of CPU Q3035 (HD6472237TF10), which compares the input voltage with a previously set threshold. When the input voltage drops below the threshold, normally due to the presence of a carrier, the CPU turns on squelch gate Q2036 and allows any demodulated audio to pass. At the same time, Q3001 and/or Q3003 and/or Q3004 goes on, causing the BUSY/TX lamp D3033 (FRGB1312CE-10-TF) to light. Transmitter Signal Flow (1) 145-MHz-Band Transmit/Receive Switching Closing PTT switch S2002 on the AF-UNIT pulls the base of Q3008 (DTA144EE) low, causing the collector to go high. This signal is fed to pin 33 (PTT) of CPU Q3035, allowing the CPU to recognize that the PTT switch has been pushed. When the CPU detects closure of the PTT switch, pin 10 (TX) goes high. This control signal is delivered to the RF-UNIT, where it switches Q1044 (UMW1) and Q1043 (CPH6102) to produce the TX control signal that activates Q1046 (2SA1774). At the same time, PLL division data is fed to PLL IC Q1019 (MB15A01PFV1) from the CPU, to disable the receiver power saver. Also, it switches Q1048 (KRC654U) to disable the receiver circuits. This causes the "red" mode of BUSY/TX lamp D3033 to light.

9 Circuit Description (2) Modulation Voice signal input from either built-in microphone MC3001 (EM-140) on the CNTL-UNIT or external jack J2002 on the AF-UNIT is pre-emphasized by C3012 and R3031, and processed by microphone amplifier Q3018 (NJM3403AV), IDC (instantaneous deviation control) circuit Q1014 to prevent overmodulation, and fed through active low-pass filter Q1014. During CTCSS operation, the voice signal is mixed with the TONE ENC subaudible tone signal from pin 43 of the CPU and delivered to the RF-UNIT through jacks J3003 and J1008. During DTMF operation, the DTMF tones from pin 44 of the CPU are fed to the IDC stage. (3) 145-MHz-Band Transmission Modulating audio from the CNTL-UNIT passes through deviation setting D/A converter Q3012 to the VHF modulator portion of the VCO-UNIT mounted on the RF-UNIT. This signal is applied to varactor D4005 (HSC277) in the tank circuit of VHF VCO Q4004 (EC3H07B), which oscillates at the desired VHF transmitting frequency. The modulated VCO signal is buffered by amplifier Q4006 (EC3H07B) and Q1017 and delivered through VHF T/R diode switch D1041 to the RF-UNIT. The modulated low- level VHF transmit signal from the VCO is passed through diode switch D1043 ( DAN222 ) to amplifier Q1014 (2SC5226-5). The modulated VHF transmit signal from the VCO is amplified by Q1023 (2SK3475) and RF power amplifier Q1027 (2SK3476) up to 0.05, 1.0, 2.5 or 5 Watts (depending on the power source). The RF output passes through TX diode switch D1053. RF output is passed by the T/R switch and low-pass filter to suppress harmonics and spurious products before output gets to the antenna at the antenna terminal. (4) 435-MHz-Band Transmission Modulating audio from the CNTL-UNIT passes through deviation setting D/A converter Q3012 to the UHF modulator portion of the VCO-UNIT mounted on the RF- UNIT. This signal is applied to varactor D4002 (HSC277) in the tank circuit of UHF VCO Q4002 (EC3H07B), which oscillates at the desired UHF transmitting frequency. The modulated VCO signal is buffered by amplifier Q4006 and Q1016 and delivered through UHF T/R diode switch D1045 to the RF-UNIT. The modulated low-level UHF transmit signal from the VCO is passed through diode switch D1045 (HN2D01FU) to amplifier Q1014. The modulated UHF transmit signal from the VCO is amplified by Q1023 and RF power amplifier Q1027 up to 0.05, 1.0, 2.5 or 5 Watts (depending on the power source). The RF output passes through TX diode switch D1048. RF output is passed through the T/R switch and low-pass filter to suppress harmonics and spurious products before output gets to the antenna at the antenna terminal. (5) 50-MHz-Band Transmission Modulating audio from the CNTL-UNIT passes through deviation setting D/A converter Q3012 to the 50 MHz modulator portion of the VCO-UNIT mounted on the RF- UNIT. This signal is applied to varactor D4009 (HSC277) in the tank circuit of 50 MHz VCO Q4005 (EC3H07B), which oscillates at the desired 50 MHz transmitting frequency. The modulated VCO signal is buffered by amplifier Q4006 and Q1018 and delivered through 50 MHz T/R diode switch D1046 to the RF-UNIT. The modulated low- level 50 MHz transmit signal from the VCO is passed through diode switch D1046 (HN2D01FU) to amplifier Q1014. The modulated 50 MHz transmit signal from the VCO is amplified by Q1023 and RF power amplifier Q1027 up to 0.05, 1.0, 2.5 or 5 Watts (depending on the power source). The RF output passes through TX diode switch D1058. RF output is passed through the T/R switch and low-pass filter to suppress harmonics and spurious products before output gets to the antenna at the antenna terminal.

10 Circuit Description PLL Frequency Synthesizer PLL IC Q1019 on the RF-UNIT consists of a data shift register, reference frequency divider, phase comparator, charge pump, "intermittent operation" circuit, and band selector switch. Serial PLL data from the CPU is convert- ed into parallel data by the shift register in the PLL IC and is latched into the comparative frequency divider and reference frequency divider to set a frequency dividing ratio for each. An 11.7-MHz reference signal produced by X1001 is fed to "REF" pin 1 of the PLL IC. The internal reference frequency divider divides the 11.7-MHz reference by 2,050 (or 1,640) to obtain a reference frequency of 5 kHz (or 6.25 kHz), which is applied to the phase comparator. Meanwhile, a sample of the output of VHF VCO Q4004 or UHF VCO Q4002 or 50 MHz VCO Q4005 on the VCO-UNIT, buffered by Q4006, is fed to the PLL IC, where it is divided by the internal comparative frequency divider to produce a comparative frequency which also is applied to the phase comparator. The phase comparator compares the phase between the reference frequency and comparative frequency to output a pulse corresponding to the phase difference between them. This pulse is fed to the charge pump, and the output from the charge pump passes through a loop filter composed of L1044, R1089, C1175, and either R1090, C1192, R1103 and C1195 for VHF, or R1086, C1189, R1102 and C1194 for UHF, or R1091, C1193, R1104 and C1196 for 50 MHz, which convert the pulse into a corresponding smoothed varactor control voltage (VCV). The VCV is applied to varactors D4004 and D4013 (1SV325) in the VHF VCO tank circuit, or to varactor D4001 (HVC355B) in the UHF VCO tank circuit, or to varactors D4007 and D4008 (1SV325) in the 50 MHz VCO, to eliminate any phase difference between the reference frequency and comparative frequency, thus locking the VCO oscillation frequency to the reference crystal. The VCO frequency is determined by the frequency-dividing ratio sent from the CPU to the PLL IC. During receiver power save operation, the PLL circuit operates intermit- tently to reduce current consumption, for which the "intermittent operation" control circuit reduces the lock-up time.

VERTEX YAESU VX-7R Repair Service Manual

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