Vertex_VX-4500_4600_UHF_serv.pdf

1VX-4500/-4600 Series UHF FM Transceiver Service Manual Introduction This manual provides the technical information necessary for servicing the VX-4500/-4600 Series Mobile Transceiver. 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 warranty, and may be illegal in some countries. Two PCB layout diagrams are 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 (surface-mount devices), and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only. As described in the pages to follow, the advanced microprocessor design of the VX-4500/-4600 allows a complete alignment of this transceiver to be performed without opening the case of the radio; all adjustments can be performed from the personal computer, using with the Vertex Standard FIF-12 USB Programming Interface and CE115 Software. While we believe the 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. 2013 Vertex Standard LMR, Inc. EC093U90G UHF FM Transceiver VX-4500 Series VX-4600 Series Service Manual VX-4600 SeriesVX-4500 Series Specifications . 2 DSUB 15-pin Accessory Connector . 3 Exploded View programmed via the CE115 program- mer) at 600-ohm. Pin 2: AF OUT (ANALOG OUTPUT) Low-level receiver output. Peak signal level is 10 dBm at 600-ohm. Pin 3: AF GND Ground for all logic levels and power supply return. Pin 4: DC OUT (13.6 V DC OUTPUT) Switched 13.6V output for supplying power to an acces- sory. Maximum output current is 1 A. Pin 5: RSSI (ANALOG OUTPUT) A DC voltage proportional to the strength of the signal cur- rently being received (Receiver Signal Strength Indicator) is provided on this pin. This low impedance output is gererated by the receiver IF sub-system and bufferd by an internal op-amp. Typical output voltages are 1 V (No Sig- nal Input) through 2.5 V (50 dB Signal Input). Pin 6: EXT PTT Shorting this port to ground causes the transceiver to be placed in the Transmit mode, while opening the connection to this port returns the transceiver to the Receive mode. Opening voltage is 5 V, closed current approx. 5 mA. Pin 7: TRX This port is intended for controlling an external TX/RX switching circuit. When the transceiver is placed in the Re- ceiver mode, this port is 5 V. When the transceiver is placed in the Transmit mode, this port reduce to 0 V. This port is open drain output which can sink approx. 50 mA when active. Pin 8: ING (IGNITION SENSE FEATURE) The VX-4500/-4600 may be automatically be switched to the STND-BY mode when the vehicles ignition key is turned on. Maximum current is 20 mA. Pin 9 - 12: ACC1 - ACC4 (ACCESSORY PORT) These port features can be programmed via the CE115 pro- grammer. Each port is open drain output which can sink approx. 50 mA when active. Max. output 16 V. When the input is selected, it becomes active between 2 V and 16 V. Pin 13: ACC5 (ACCESSORY PORT) The port 5 is available to set only for Output function, and active logic is opposite side against the Port 1 4. Max. output 5 V, closed current approx. 1 mA (CMOS out- put). Pin 14: ACC6 (ACCESSORY PORT) The port 6 is available to set only for Input function, and active logic is opposite side against the Port 1 4. Max. input 5 V (CMOS input). Pin 15: GND Chassis ground 4VX-4500/-4600 Series UHF FM Transceiver Service Manual Exploded View realignment should not be done until after the faulty component has been replaced. We recommend that servicing be performed only by authorized Vertex Standard service technicians who are experienced with the circuitry and fully equipped for repair and alignment. There- fore, 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 cir- cuits and make complete performance checks to ensure com- pliance with factory specifications after replacing any faulty components. Those who do undertake any of the following align- ments are cautioned to proceed at their own risk. Problems caused by unauthorized attempts at realignment are not cov- ered 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 notifying own- ers. Under no circumstances should any alignment be attempt- ed unless the normal function and operation of the transceiver are clearly understood, the cause of the malfunction has been clearly pinpointed and any faulty components replaced, and the need for realignment determined to be absolutely necessary. The following test equipment (and thorough familiarity with its correct use) is necessary for complete realignment. Correction of problems caused by misalignment resulting from use of im- proper test equipment is not covered under the warranty policy. While most steps do not require all of the equipment listed, the interactions of some adjustments may require that more com- plex adjustments be performed afterwards. Do not attempt to perform only a single step unless it is clearly isolated electrical- ly from all other steps. Have all test equipment ready before beginning, and follow all of the steps in a section in the order presented. Required Test Equipment ? Radio Tester with calibrated output level at 1 GHz ? In-line Wattmeter with 5% accuracy at 1 GHz ? 50-ohm, 50-W RF Dummy Load ? Regulated DC Power Supply (standard 13.6V DC, 15A) ? Frequency Counter: 0.2 ppm accuracy at 1 GHz ? AF Signal Generator ? AC Voltmeter ? DC Voltmeter ? UHF Sampling Coupler ? IBM PC/compatible Computer with Microsoft Windows 2000, XP, Vista or Windows7 ? Vertex Standard CE115 PC Programming Software ? Vertex Standard FIF-12 USB Programming Interface and CT-104A, CT-106, or CT-171 PC Programming Cable ? Vertex FRB-6 Tuning Interface Box and CT-159 Connec- tion Cable Alignment Preparation & Precautions A 50-ohm RF Dummy load and in-line wattmeter must be con- nected to the main antenna jack in all procedures that call for transmission, except where specified otherwise. Correct align- ment is not possible with an antenna. Beacuse of the BTL (Bridged Trans Less) Amplifier circuit used in the VX-4500/-4600, do not connect eather side of the speak- er leads to chassis “ground”. After completing one step, read the following step to determine whether the same test equipment will be required. If not, re- move the test equipment (except dummy load and wattmeter, if connected) before proceeding. Correct alignment requires that the ambient temperature be the same as that of the transceiver and test equipment, and that this temperature be held constant between 20 C and 30 C (68 F 86 F). When the transceiver is brought into the shop from hot or cold air, it should be allowed time to come to room temper- ature before alignment. Whenever possible, alignments should be made with oscillator shields and circuit boards firmly affixed in place. Also, the test equipment must be thoroughly warmed up before beginning. Note: Signal levels in dB referred to in this procedure are based on 0 dB EMF = 1.0 V. Alignment 10VX-4500/-4600 Series UHF FM Transceiver Service Manual Alignment Test Setup Setup the test equipment as shown below, and then apply 13.6V DC power to the transceiver. Caution! Please never turn off the power supply during alignment. If the power supply is turned off during alignment, the alignment data will be corrupted. The Alignment Tool Outline Installation of the alignment tool ? Install the CE115 (PC Programming Software) to your PC. ? “Alignment“ function in the “Radio“ menu tab of CE115. Action of the switches When the transceiver is in the “Alignment mode,“ the action of the PTT and all PF KEYS are ignored. All of the action is con- trolled by the PC. Inline Wattmeter 50-ohm Dummy Load RF Signal Generator AF Signal Generator SINAD Meter Power Supply 13.6 VDC Computer (CE115) FRB-6 Deviation Meter Frequency Counter VX-4500/-4600 MIC & EXT SP D-Sub 15-pin Connector MIC IN SP OUT B CT-159 SP/LOAD Switch: LOAD LOAD Switch: 4? DC INPUTCLONE Port CT-104A, CT-106, or CT-171 ANT Sampling Coupler FIF-12 11VX-4500/-4600 Series UHF FM Transceiver Service Manual Alignment Alignment Mode The Alignment mode allows you to align the entire radio. The value of each parameter can be changed to the desired value by use of the “” / “” and up/down arrow keys, along with di- rect number input and dragging of the PC mouse. To enter the Alignment Mode, select “Alignment” in the main “Radio” menu. It will start to “Upload” the alignment data from the radio to the PC. Pressing the “OK” button will then “Down- load” the alignment data to the radio and exit the Alignment Mode. Note: when all items are to be aligned, it is strongly recom- mended to align them according to the following sequence. De- tailed information for each step may be found in the “Help” file within CE115 (PC Programming Software). 1. VCO (Please do not adjust it) 2. PLL Reference Frequency (Frequency) 3. RX Sensitivity (RX Tune) 4. Squelch (SQL/RSSI) 5. TX Power 6. Maximum Deviation Please adjust the following items when needed. Modulation Balance CTCSS Deviation DCS Deviation DTMF Alignment Seq Tone VOX ON Level TX MSK Ext AF Out Unit During alignment, you may select the value among dBV,V (EMF or PD), or dBm. When performing the “RX Tune” and “SQL” alignment, the RF level shows this unit according to this setting. 12VX-4500/-4600 Series UHF FM Transceiver Service Manual Alignment 1. VCO (RX VCO/TX VCO) - Normally there is no need to adjust this parameter - This parameter is to align the VCO Voltage adjustment. 2. PLL Reference Frequency (Frequency) This parameter is to align the reference frequency for PLL. 1. Press the “Frequency” button to start the alignment. The Frequency Alignment window will appear. 2. Click the “PTT” button or press the “SPACE” bar, and the radio will start to transmit on the center frequency channel. 3. Set the value to get the desired frequency by dragging the slide bar, clicking the up-down button, pressing the left or right arrow key, or entering the value in the entry box. 4. After getting the desired frequency click the “PTT” button or press the “SPACE” bar to stop transmitting. 5. Click the “OK” button to finish the frequency alignment and save the data. 13VX-4500/-4600 Series UHF FM Transceiver Service Manual Alignment 3. RX Sensitivity (RX Tune) This parameter is to align the RX BPF (Band Pass Filter) for Receive (RX) sensitivity. The PLL Reference Frequency (Frequency) alignment must be done before this alignment is performed. 1. Press the “RX Tune” button to start the alignment. The RX Sensitivity Alignment window will appear. 2. Click the left mouse button on the slide bar or press the Up / Down arrow keys, to switch to the desired channel for alignment. 3. Set the Signal Generator according to the indication at the top of the screen (Setting Your SG as followings). 4. Drag the slide bar, click the up-down buttons, press the left or right arrow key, or enter the value in the entry box to get the best RX sensitivity (Highest RSSI value) on the select- ed channel. 5. Click the “OK” button to finish the RX Sensitivity align- ment and save the data. ADJ Type Basic:“Low-edge / band center / high-edge“ and se- lect the channel for alignment (Default). Single:Alignment value changes only on the selected channel. All Freq:Alignment value changes on all channels. 14VX-4500/-4600 Series UHF FM Transceiver Service Manual Alignment 4. Squelch (SQL) This parameter is to align the SQL (Squelch) Sensitivity. There are several alignments as follows in the Squelch Sensitivity. Tight SQL Level (TI NSQ W/N) The Alignment for the Noise SQL Tight level at Wide (5k/4k) or Narrow (2.5k). Threshold SQL Level (TH NSQ W/N) The Alignment for the Noise SQL Threshold level at Wide (5k/ 4k) or Narrow (2.5k). Tight SQL RSSI Level (TI RSSI W/N) The Alignment for the “level 14” of the RSSI SQL level at Wide (5k/4k) or Narrow (2.5k). TX Save RSSI Level (TX SAVE W/N) The Alignment for the TX Save RSSI level at Wide (5k/4k) or Narrow (2.5k). The procedure for all the alignments is as follows. 1. Click the “Start” button to open the alignment window in the SQL/RSSI Alignment menu. 2. The Alignment window will appear, Set the Signal Genera- tor according to the indication, then click the “Start” but- ton. 3. The automatic alignment will start to get the SQL or RSSI level. 4. It will show the alignment result in the “New” box. 5. Click the “OK” button, then the data will be saved and the alignment is finished. 15VX-4500/-4600 Series UHF FM Transceiver Service Manual Alignment 5. TX Power This parameter is to align the “Power High”, “Power Low3”, “Power Low2” or “Power Low1” for the selected channel. 1. Press the “TX Pwr(H / L3 / L2 / L1)” button to start the alignment. The TX Power Alignment window will appear. 2. Click the left mouse button on the slide bar or press the Up / Down arrow key, to select the desired channel. 3. Click the “PTT” button or press the “SPACE” bar at the desired channel, then the radio starts to transmit on the se- lected channel. 4. Set the value to get desired output power on the Power Meter by dragging the slide bar, clicking the up-down button, press- ing the left or right arrow key, or entering the value in the entry box on the selected channel. 5. After getting the desired output power click the “PTT” but- ton or press the “SPACE” bar to stop transmitting. 6. Click the “OK” button to finish the TX Power alignment and save the data. ADJ Type Basic:“Low-edge / band center / high-edge“ and se- lect the channel for alignment (Default). Single:Alignment value changes only on the selected channel. All Freq:Alignment value changes on all channels. 16VX-4500/-4600 Series UHF FM Transceiver Service Manual Alignment 6. Maximum Deviation / This parameter is to align the “Maximum Deviation” (Wide/Narrow). 1. Press the “Max Dev (W/N)” button to start the alignment. 2. The Max Deviation alignment window will appear. 3. Set the AF Signal Generator output level to 24 dBm at 1 kHz tone (Sine Wave). 4. Select the desired channel by following method: ? Clicking the left mouse button on the slide bar of the desired channel ? Pressing the Up / Down arrow key of the desired chan- nel 5. Click the “PTT” button or press the “SPACE” bar,