Nautel VS300 Troubleshooting Manual
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Nautel VS300 Troubleshooting Manual

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VS300 Transmitter
Troubleshooting Manual
Document:NHB-VS300-TRB
Issue:
10.0 2019-01-18
Status:
Standard

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Summary of Contents for Nautel VS300

  • Page 1 VS300 Transmitter Troubleshooting Manual Document:NHB-VS300-TRB Issue: 10.0 2019-01-18 Status: Standard...
  • Page 3 The comparisons and other information provided in this document have been prepared in good faith based on publicly available information. The reader is encouraged to consult the respective manufacturer's most recent published data for verification. © Copyright 2019 NAUTEL. All rights reserved.

  • Page 5: Table Of Contents

    VS300 Troubleshooting Manual Table of contents Contents Release control record Responding to alarms Corrective maintenance Electrostatic protection Identifying and troubleshooting an alarm Troubleshooting tips 1-27 Operating in FM+HD mode with SWR Foldback 1-28 Replacing a suspect PWB, power supply or fan...
  • Page 6 VS300 Troubleshooting Manual Table of contents Parts Lists Parts information Family tree How to locate information about a specific part Column content Common abbreviations/acronyms Wiring/connector lists Wiring lists provided Wiring lists not provided Connector mating information Wire colours Printed wiring board patterns...

  • Page 7: Release Control Record

    VS300 Troubleshooting Manual Release control record Issue Date Reason 10.0 2019-01-18 Supports hardware NARF64I/02 and NARF64I/03. Supports software version VS SW 5.2 and higher. Issue 10.0 2019-01-18 Page vii...
  • Page 8 VS300 Troubleshooting Manual Page viii Issue 10.0 2019-01-18...

  • Page 9: Responding To Alarms

    VS300 Troubleshooting Manual Responding to alarms Section 1: Responding to alarms This section provides instructions you need when performing troubleshooting on the VS300 transmitter. This section includes the following topics: • Corrective maintenance • Electrostatic protection - see page 1-3 •...
  • Page 10 VS300 Troubleshooting Manual Responding to alarms Remote troubleshooting Remote on-air troubleshooting consists of monitoring the transmitter's radiated signal using an on-air monitor or via a LAN connection, and observing the status of each remote fault alarm indicator. Information obtained from these sources should enable an operator to decide...
  • Page 11 VS300 Troubleshooting Manual Responding to alarms Electrostatic protection The transmitter's assemblies contain semiconductor devices that are susceptible to damage from electrostatic discharge. The following precautions must be observed when handling an assembly which contains these devices. CAUTION: Electrostatic energy is produced when two insulating materials are rubbed together.
  • Page 12 VS300 Troubleshooting Manual Responding to alarms Identifying and troubleshooting an alarm You can identify an alarm locally by viewing the front panel (see “Front panel alarm checks”) or remotely by viewing the AUI’s Transmitter Status page (see “AUI Transmitter status page checks”...
  • Page 13 VS300 Troubleshooting Manual Responding to alarms View alarms screen If an alarm exists and is currently being recognized by the transmitter system, it is displayed in the View Alarms screen ( Main Menu -> View Status -> View Alarms ) of the front panel Display...
  • Page 14 5. If troubleshooting and subsequent replacement of a suspect PWB or module causes the alarm to disappear from the View Alarms screen, the alarm has been successfully cleared. If the fault condition does not clear, contact Nautel. Page 1-6 Issue 10.0 2019-01-18...
  • Page 15 VS300 Troubleshooting Manual Responding to alarms AUI Transmitter status page checks If an alarm exists and is being recognized by the transmitter (i.e., the Status button at the bottom of the AUI display will be red), it is displayed on the transmitter status page (see Figure 1.3).
  • Page 16 5. If troubleshooting and subsequent replacement of a suspect PWB or module causes the alarm to disappear from the Transmitter Status page, the alarm has been successfully cleared. If the fault condition does not clear, contact Nautel. Page 1-8 Issue 10.0 2019-01-18...
  • Page 17 (A1) is outside of its acceptable voltage range (between +1.1 V (+1.2V Fail) and +1.3 V). The VS300 takes no action on this alarm. Check for a +5V Supply Fail alarm: If present, follow the associated troubleshooting procedure. If not present, use a digital multimeter to measure between TP3 (+1.2 V) and TP4 (ground) of the...
  • Page 18 (between -13.5 V and (-15V Fail) -16.5 V). The VS300 takes no action on this alarm. Check for a +15V Supply Fail alarm: If present, follow the associated troubleshooting procedure. If not present, use a digital multimeter to measure between TP11 and TP7 (ground) of the exciter/control PWB.
  • Page 19 (A1) is outside of its acceptable voltage range (between +3.0 V (+3.3V Fail) and +3.6 V). The VS300 takes no action on this alarm. Check for a +5V Supply Fail alarm: If present, follow the associated troubleshooting procedure. If not present, use a digital multimeter to measure between TP1 (+3.3 V) and TP4 (ground) of the...
  • Page 20 PS distribution PWB (A2). Analog Left Exciter (amber) This alarm indicates the analog left audio input level is too low or Audio Low is not applied. The VS300 takes no action on this alarm. (Anlg Left Aud Low) Analog Right Exciter (amber)
  • Page 21 Mismatch transmitter does not match the version expected to be seen by the (CPLD Ver version of code installed on the DSP. The VS300 will not be able Mismatch) to turn RF on. Contact Nautel for further assistance. Cutback Active...
  • Page 22 External Exciter (red) This alarm occurs when the external interlock input wired to the Interlock Open exciter/control PWB (A1) is open. The VS300 will not be able to (External enable its RF output. Check the interlock connection between Interlock) A1J2A-19 and A1J2A-20 on the rear of the transmitter. If the interlock connection is intact, check that all external interlock switches are closed.
  • Page 23 (amber) below 3000 RPM (half of its nominal value of 6000 RPM). The VS300 will inhibit the RF output if this alarm is present. Check the connection between the fan and the interface PWB (A3). If this connection looks OK, replace the fan (see “Cooling fan...
  • Page 24 342 W). This alarm occurs only if the Power) exciter ALC cannot respond fast enough to transmitter load changes. The VS300 takes no action on this alarm. Check for associated alarms and follow the associated troubleshooting procedure, if present. If no other alarms exist, inspect the antenna network attached to the transmitter.
  • Page 25 Exciter (amber) This alarm occurs if the backup battery voltage falls below an acceptable level (2.7 V). The VS300 takes no action on this alarm. Use a digital multimeter to measure the battery voltage (with ac power on). If the battery voltage is low, replace the battery. If battery voltage is OK, cycle ac power (off, then on).
  • Page 26 (+48V Fail) outside of its acceptable voltage range (between +43 and +53 V). The VS300 takes no action on this alarm. Use a digital multimeter to measure between +V and -V of the +48 V power supply. If the measured value is not within the acceptable range, replace the +48 V power supply (see “+48 V Power Supply Replacement”...
  • Page 27 Check for associated alarms. Typically, the assertion of this alarm is the result of a PA failure or removal, or a high SWR condition. If no other alarms are being indicated, contact Nautel for further support. Issue 10.0 2019-01-18 Page 1-19...
  • Page 28 PA (red) This alarm occurs if the measured pre-amp current is below 17.5 mA. The VS300 takes no action on this alarm. Try running the Bias Routine in the front panel UI’s System Settings -> Calibration menu. If the alarm does not clear, replace the pre-...
  • Page 29 PS (red) This alarm occurs if the power supply module (U2) is not being detected or has been removed. The VS300 will inhibit its RF output until the alarm is cleared. If there is a power supply module in the transmitter, try replacing the power supply module with a new module (see “Power Supply Module Replacement”...
  • Page 30 The VS300 takes no action on this alarm. SRC1 Unlock Exciter (amber) This alarm indicates that no valid AES/EBU stream data is being detected on the selected AES/EBU. The VS300 takes no action on this alarm. SWR Foldback Output Network...
  • Page 31 VS300 Troubleshooting Manual Responding to alarms Alarm Name Front Panel AUI and Description and Troubleshooting Action LED (color) (Front Panel) SWR Shutback Output Network This alarm occurs if the transmitter's reflected power suddenly (red) exceeds the SWR shutback threshold, which is the reflected...
  • Page 32 VS300 Troubleshooting Manual Responding to alarms Table 1.2: Troubleshooting Summary Alarms Summary Alarm Description and Triggering Alarms Name This summary alarm is triggered if any of the following ac power related alarms occur: PS A AC Fail Audio Loss This summary alarm is triggered if any of the following audio loss related alarms...
  • Page 33 VS300 Troubleshooting Manual Responding to alarms Table 1.2: Troubleshooting Summary Alarms Summary Alarm Description and Triggering Alarms Name Low Battery/Memory This summary alarm is triggered if any of the following battery or memory related alarms occur: Entered Firmware Upgrade Low Battery...
  • Page 34 VS300 Troubleshooting Manual Responding to alarms Table 1.2: Troubleshooting Summary Alarms Summary Alarm Description and Triggering Alarms Name Power Supply This summary alarm is triggered if any of the following power supply related alarms occur: Discharging PA Volts PS A Over Temp +1.8V Fail...
  • Page 35 ARM Reset procedure in the Operations and Maintenance Manual. If the AUI is still inaccessible, try cycling (turn off, then on) the ac power. If the problem persists, contact Nautel for further assistance. Issue 10.0 2019-01-18...

  • Page 36: Operating In Fm+Hd Mode With Swr Foldback

    Responding to alarms Operating in FM+HD mode with SWR Foldback When an SWR Foldback alarm occurs, the VS300’s forward power will be reduced to a level that maintains an SWR that is below the foldback threshold. For FM+HD systems, the reduced forward power also depends on the injection level (e.g., -20 dBc, -14 dBc, etc.) and the...
  • Page 37 VS300 Troubleshooting Manual Responding to alarms Replacing a suspect PWB, power supply or fan Maintenance philosophy Maintenance on a VS300 transmitter consists of replacing any of the PWBs, power supplies or fans identified in Table 1.4 on page 1-30. Special Tools and Test Equipment The following tools and test equipment are required to troubleshoot a VS300 transmitter.
  • Page 38 Responding to alarms Preparation for replacing a PWB or module 1. Disable the VS300’s RF output (RF off) and set its AC POWER switch to the off position. Disconnect all cabling from the rear of the VS300, remove the VS300 from its host cabinet and place the VS300 on a suitable work surface.

  • Page 39: Pa Pwb Replacement

    FETs are static sensitive. Handle the PA PWB in a static protected manner. 8. Spread a small amount of thermal compound (Nautel Part # HAG39, from the station spares kit), in a thin, even layer, on the top and bottom of the RT1 tab, removed in Step 5.
  • Page 40 VS300 Troubleshooting Manual Responding to alarms 10. Secure the PA PWB on the module's heat sink using the four screws removed in Step 5. Ensure correct orientation. Re-install thermistor RT1 under the appropriate securing screw (see Figure MD-2 in section 6 of this manual). Do not tighten the four screws at this time.

  • Page 41: Pre-Amp Pwb Replacement

    FETs are static sensitive. Handle the pre-amp PWB in a static protected manner. 8. Spread a small amount of thermal compound (Nautel Part # HAG39, from the station spares kit), in a thin, even layer, on the bottom surface of the pre-amp/IPA PWB palette.
  • Page 42 Avoid this by alternately tightening the two screws. – Install a FET clamp (Nautel Part # 211-1215) on Q1, ensuring it is parallel to the heat sink. Loosely secure the FET (Q1) with two M3 screws, two Belleville washers...
  • Page 43 VS300 Troubleshooting Manual Responding to alarms Figure 1.4: Pre-amp PWB mounting hardware BELLEVILLE WASHER ORIENTATION SCREW x 2 BELLEVILLE WASHER (HAJ59) x 2 (see inset for orientation) FLAT WASHER x 2 FET CLAMP (211-1215) Issue 10.0 2019-01-18 Page 1-35...

  • Page 44: Power Supply Module Replacement

    2. Remove the securing cover over the power supply module (U2) by removing four M4 screws (two on the side of the VS300, two in the bottom of the VS300). Note the orientation of the bracket for installation of the new power supply module. Retain hardware.

  • Page 45: +48 V Power Supply Replacement

    Retain hardware. 4. Remove the +48 V power supply from the transmitter. Note the orientation for installation of the new power supply. 5. Locate or obtain a replacement +48 V power supply (Nautel Part # UG79). Reverse Step 1 through Step 4 to reinstall the new +48 V power supply.

  • Page 46: Lvps Replacement

    3. Remove the two countersunk M3 screws that secure the LVPS (U3) to the transmitter. Retain hardware. 4. Remove the LVPS from the transmitter. Note the orientation for installation of the new power supply. 5. Locate or obtain a replacement LVPS (Nautel Part # UG80). Reverse Step 1 through Step 4 to reinstall the new LVPS.

  • Page 47: Cooling Fan Replacement

    Note the orientation of the bracket and fan before disassembling. 5. Obtain a replacement fan (Nautel Part # ZAP50) from the station spares kit, if purchased, or a suitable equivalent (vendor part # is Minebea Motor Mfg. Co.
  • Page 48 VS300 Troubleshooting Manual Responding to alarms Figure 1.5: Fan Bracket Removal B1 and bracket Page 1-40 Issue 10.0 2019-01-18...

  • Page 49: Exciter/Control Pwb Replacement

    VS300 Troubleshooting Manual Responding to alarms Exciter/Control PWB Replacement See Figure MD-1 (top view) in the Mechanical Drawings section (Section 6) of this manual. NOTE: The exciter/control PWB is static sensitive and must be handled in a static protected manner.
  • Page 50 VS300 Troubleshooting Manual Responding to alarms Figure 1.6: Removing the XLR connector’s “push” lever Figure 1.7: Loosening the BNC connector’s locking ring Page 1-42 Issue 10.0 2019-01-18...
  • Page 51 6. Slightly lift the front edge of the exciter/control PWB and withdraw towards the front of the transmitter. 7. Locate or obtain a replacement exciter/control PWB (Nautel Part # NAPE87B). Remove the “push” lever from the XLR connector as detailed in...

  • Page 52: Ps Distribution Pwb Replacement

    5. Use a 5.5 mm nut driver to remove the M3 nuts, split and flat washers that secure the PS distribution PWB to the transmitter. Retain hardware. 6. Remove the PS distribution PWB from the transmitter. 7. Locate or obtain a replacement PS distribution PWB (Nautel Part # NAPS40). Reverse Step 1 through Step 6 to reinstall the new PS distribution PWB.

  • Page 53: Output Power Probe Pwb Replacement

    LPF PWB or to apply excessive pressure to connections on pads A and B of the LPF PWB or on pads C and D of the PA PWB. 9. Locate or obtain a replacement output power probe PWB (Nautel Part # NAPP06). Reverse...
  • Page 54 VS300 Troubleshooting Manual Responding to alarms Page 1-46 Issue 10.0 2019-01-18...

  • Page 55: Detailed Circuit Descriptions

    Pre-amplifier PWB (NAPA27A) - see page 2-3 • Power amplifier PWB (NAPA23/03) - see page 2-3 VS300 electrical schematics The descriptions in this section all refer to the VS300 electrical schematics listed in Table 5.1 on page 5-4 of the VS300 Troubleshooting Manual.
  • Page 56 See electrical schematic Figure SD-3. Interfacing The PS distribution PWB provides the interface between the VS300’s power supplies and the rest of the transmitter. It passes: – ac voltage from the AC INPUT (U1) to the power supply module (U2).
  • Page 57 VS300 Troubleshooting Manual Detailed Circuit Descriptions Pre-amplifier PWB (NAPA27A) See electrical schematic Figure SD-4. The pre-amplifier PWB (A4) accepts the RF output of the exciter/control PWB (A1) or external source and amplifies it to an intermediate RF drive level for application to the PA PWB (A5).
  • Page 58 VS300 Troubleshooting Manual Detailed Circuit Descriptions applied to the individual drains of Q1 via inductors L4 and L5, which provide proper resonating reactance for Q1's output. Cable T3:A and T3:B transform the impedance at the RF output, ensuring an optimum (low) impedance is presented at Q1's output. Cable T4 converts the balanced RF signal to an unbalanced RF Output signal.

  • Page 59: Parts Lists

    Nautel configuration control number, then locate the reference designation information for that Nautel configuration control number. • Locate the part's reference designation and associated Nautel Part # in the list provided at the end of this section. In a PDF manual, use Ctrl-F (find) to quickly locate the reference designation.

  • Page 60: Column Content

    This number represents the level of a component in relation to the highest level parts list. In this case the highest level parts list is the VS300’s overall parts list, or the top block in the family tree shown in Figure 3.1 on page 3-4...

  • Page 61: Common Abbreviations/Acronyms

    Note: This section includes Nautel part numbers only. It does not include original equipment manufacturer (OEM) information (i.e., vendor part numbers). Some vendor information is provided in the Responding to Alarms section of this manual, otherwise contact Nautel to order a replacement part or to request assistance to find a suitable replacement.
  • Page 62 VS300 Troubleshooting Manual Parts Lists Figure 3.1: VS300 Family Tree VS300 300W FM BROADCAST TRANSMITTER NARF64I/02 AND NARF64I/03 EXCITER/CONTROL PWB POWER SUPPLY DISTRIBUTION PWB INTERFACE PWB PRE-AMP PWB NAPE87B NAPS40 NAPI131 NAPA27A POWER AMPLIFIER 1 PWB LOW PASS FILTER PWB...
  • Page 63 NARF64I/02 Page 1 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation 200-5112 USB Mod, Programmed VS (Handbook) 211-8004-04 Cableset Assy - VS300 HAM69 Conn,Quick-Dis,F,1/4 Tab 14-16 Shrink P01, P02, P05, P06, P07, P08...
  • Page 64 NARF64I/02 Page 2 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation LA50 Inductor, Horseshoe, used with PA NAPA16 & 20 L04, L05 LA51 Inductor, used with PA NAPA16 & 20...
  • Page 65 NARF64I/02 Page 3 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation CCFS01 Cap,SMT,Ceramic,0.001uF,10%,50 V,X7R,0603 C008, C033, C122, C125, C127, C152, C158, C159, C161, C162, C175, C176, C180, C182, C183, C185,, C188, C189,...
  • Page 66 NARF64I/02 Page 4 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation CCFS52 Cap, SMT, Ceramic, 0.1uF, 10% 25V X7R, 0603 C002, C003, C011, C013, C019, C025, C026, C037, C040,...
  • Page 67 NARF64I/02 Page 5 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation CT85 Cap, SMT, Ceramic, 3 Terminal, 22pF, 16vDC, 600mA C100, C101, C102, C103, C260, C263, C267, C272, C278,...
  • Page 68 NARF64I/02 Page 6 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation LS17 Inductor,SMT,Pwr,Shielded,P116 7 Series,3.5A,3.6uH L003, L013 LS20 Inductor,SMT,560nH,325mA,2520 L008, L009, L021, L041 LS22 Choke,SMT,Common Mode,2200 ohm ,200mA,1206 L117, L119 LS24 Inductor, SMT, 10uH, 2.4A, RMS...
  • Page 69 NARF64I/02 Page 7 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation RFFS23 Resistor,SMT,MF,56.2ohms,1%, 1/10W,0603 R335, R336 RFFS26 Resistor,SMT,MF,100ohms,1%, 1/10W,0603 R046, R048, R060, R064, R069, R072, R116, R118, R129, R150, R151, R193, R215, R220, R227, R228,, R229, R243,...
  • Page 70 NARF64I/02 Page 8 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation RFFS50 Resistor,SMT,MF,10.0Kohms,1%, 1/10W,0603 R002, R008, R011, R018, R026, R032, R045, R049, R051, R053, R057, R061, R080, R084, R091, R092,, R102, R110,...
  • Page 71 NARF64I/02 Page 9 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation UDLS09 IC,SMT,CMOS,Hex Inverter,Unbuf f,SO-14 U001 UDMS11 IC. SMT, NAND Flash 4Gb, x8, 1b ECC, TSOP-48 U015 UDOS01 IC,SMT,Dual Optocoupler,SOIC-8...
  • Page 72 NARF64I/02 Page 10 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation UT114 IC, Voltage Regulator, +8V, 1A DPAK U091 UT115 IC, SMT, ARM Processor, 266MHz TFBGA296 U029 UT116 Oscillator, SMT, TCVCXO, 3.3V, 2ppm, 5x3.2mm...
  • Page 73 NARF64I/02 Page 11 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation CCFS10 Cap,SMT,Ceramic,1uF,10%,25V, ,X7R,1206 C03, C09 CCFS62 Cap, SMT, Ceramic, 10uF, 10%, 25V C05, C08 CX38 Cap,SMT,Ceramic,4.7uF,10%,10V, X5R, 1206 RAD05 Resistor, SMT, MF, 22.1 Ohms, 1% 1/4W...
  • Page 74 NARF64I/02 Page 12 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation QDLS01 Diode, SMT, LED, Green, (560nm), 0603 DS01, DS02, DS03 QR70 Suppressor, Transient Voltage, SMT 60V Clamp CR01, CR02, CR03, CR04, CR05, CR06...
  • Page 75 NARF64I/02 Page 13 of 13 StockCode: Description: Final Assy, VS300, Type N (w/o JA55), RLS 10, Component Lvl, StockCode Description Reference Designation UG69J Pwr Sply, 7-53Vdc, 2000W, 50A 90-264Vac, Hi-Eff (8 UG79 Power Supply, 48V, 50W Univ. Input UG80 Power Supply, 5V, */-15V, 50W, Univ Input UW146 Display, 20x4 LCD, 3.3 - 5V, -20/+70...

  • Page 77: Wiring/Connector Lists

    VS300 Troubleshooting Manual Wiring/connector lists Section 4: Wiring/connector lists This section contains the wiring information for the hard-wired assemblies of the transmitter, and applicable connector mating information. Wiring lists provided Wiring lists are provided in tabular format. Table 4.1 on page 4-2 lists the tables containing wiring information.
  • Page 78 Table 4.1: Wiring Lists Provided Table # Description Table 4.3 Wiring List - VS300 Transmitter (page 4-3) Table 4.2: Connector Mating Information Provided Table # Description Table 4.4 Connector Mating Information - VS300 Transmitter (page 4-4) Page 4-2 Issue 10.0 2019-01-18...
  • Page 79 VS300 Troubleshooting Manual Wiring/connector lists Table 4.3: Wiring List - VS300 Transmitter Source Destination Wire # Colour Size Remarks U3-(COM) U4-(-V) Black A2TB1-2 C1E1 White A2TB1-3 A2TB1-1 Black E2-(GND) A2E3 Grn/Yel E2-(GND) U3-(GND) Grn/Yel U1-L CB1-P1 Grey P9-1 P10-2 White...
  • Page 80 Coaxial Cable J1-Shield A7-K Shield J2-Center A7-M Conductor RG188 Coaxial Cable J2-Shield A7-L Shield Table 4.4: Connector Mating Information - VS300 Transmitter Connector Mate Remarks B1P1 A3J1 Fan connection Not Used Not Used Not Used Not Used Not Used Not Used...

  • Page 81: Reading Electrical Schematics

    • Resistor power ratings are not shown when less than 0.5 W • Capacitor values are shown in microfarads (uF) • Unidentified diodes are part number 1N4938 (Nautel Part # QAP29) Graphic symbols The graphic symbols used on electrical schematics are in accordance with American National Standard ANSI Y32.2-1975 - Graphic Symbols for Electrical and Electronic Diagrams.

  • Page 82: Unique Symbols

    VS300 Troubleshooting Manual Reading Electrical Schematics Unique symbols Nautel uses unique symbols on electrical schematics to describe logic (two-state) signals. These signals differ from single-state signals or analog signals that may have multiple values. Type of inputs and outputs On electrical schematics, names used to describe logic (two-state) input and output signals are prefixed with a # symbol.

  • Page 83: Structure Of Schematics

    3-1. Follow the family tree branches to the block that contains the desired reference designation, and associated Nautel nomenclature (e.g., NAPA23/03A PA PWB ). Note the reference designations and Nautel nomenclatures of all higher assemblies in the path, if applicable.

  • Page 84: Locating A Part Or Assembly On A Schematic

    3-1. 2. Follow the family tree branches to the block that contains the desired reference designation, while noting the Nautel nomenclatures and names of all higher assemblies in the path, as applicable. Example: A5 NAPA23/03A PA PWB . Note: The drawings in the Mechanical Drawings section depict the assembly detail of the transmitter and its modules and assemblies.
  • Page 85 EXTERNAL HD UPGRADE RX (-) PILOT SAMPLE OUT EXCITER HD DATA (+) HD DATA (-) +15V OUT +15V OUT FROM EXTERNAL EXT 10 MHz SOURCE 211-8000-18-SCH01 VA Figure SD-1: VS300 Transmitter - Ac-Dc and Exciter/Control Stages Issue 10.0 2019-01-18 SD-1...
  • Page 86 FAN V - FAN V - FAN V - PA TEMP 1 PA TEMP 1 GND 0.01 PART OF B5920 INTERFACE PWB ASSY 211-8000-18-SCH02 VA Figure SD-2: VS300 Transmitter - RF Drive and RF Power Stages Issue 10.0 2019-01-18 SD-2...
  • Page 87 LINE LINE +48V FAN V - LINE/NEUTRAL LINE/NEUTRAL +48V GND/EARTH IRF9540NSPBF 22.1K 82.5K # FAN ENABLE + MMBT4401LT1 FAN V + 0.01 0.01 1000 RXE110 PA V + 0.01 0.01 0.005 # 165 LOAD - MISO 165 SHIFT/LOAD PA V - +VE (PS A) 0603ESDA-TR 0603ESDA-TR...
  • Page 88 PRE-AMP V 82nH 120nH 68uF 0.022 1000pF * DENOTES A MICRO-STRIP TRANSMISSION LINE OF SPECIFIC LENGTH AND CHARACTERISTIC IMPEDANCE. PRE-AMP BIAS 0.022 1000pF 43nH RF OUTPUT 0.0355μH 0.0355μH 10pF 1000pF 10pF 12pF MRF6V2010N RF DRIVE INPUT 43nH 47pF 1000pF S2110045 V2 Figure SD-4: NAPA27A Pre-Amp PA PWB Issue 10.0 2019-01-18 SD-4...
  • Page 89 PA V 1000 470pF PA BIAS 0.01 T3:A Q1:A STAC2942B T2:B RF OUTPUT RF DRIVE INPUT 0.001 0.001 27pF 0.01 0.01 Q1:B STAC2942B 56pF T3:B T2:A 27pF S2110139 V1 0.01 47.5K Figure SD-5: NAPA23/03A PA PWB Issue 10.0 2019-01-18 SD-5...

  • Page 90: Mechanical Drawings

    Section 3, “Parts Lists” on page 3-1. Follow the family tree branches to the block that contains the desired reference designation and Nautel nomenclature (e.g., NAPA23/03A PA PWB ). Note the reference designations and Nautel nomenclatures of all higher assemblies in the path, as applicable.
  • Page 91 Then, repeat this procedure until the desired part or assembly is found. Table 6.1: List of Mechanical Drawings Figure # Title MD-1 VS300 Transmitter (Top and Bottom Views) MD-2 NAPE87B Exciter/Control PWB MD-3 NAPS40 PS Distribution PWB MD-4...
  • Page 92 POWER LVPS SUPPLY SUPPLY MODULE MODULE MODULE DISTRIBUTION EXCITER/ CONTROL TOP VIEW (COVER REMOVED) INTERFACE OUTPUT POWER PROBE PWB PRE-AMP PA PWB LPF PWB REAR VIEW FRONT VIEW Figure MD-1: VS300 Transmitter (Front and Top Views) Issue 10.0 2019-01-18 MD-1...
  • Page 93 L124 (LOWER) (LOWER) L103 L132 U120 L144 L125 R448 R455 (UPPER) (UPPER) R221 R48 R51 R237 U105 R235 R458 C165 C562 C138 R129 C419 C235 R456 R139 R238 R348 R449 C415 L157 C563 C166 R349 C412 C226 R262 C314 R442 R140 R239 C286...
  • Page 94 TP11 +4.096V TX TYPE FAIL TP12 TP10 +48V TP14 V CTRL PRE-AMP TP13 PA CUR PS DISTRIBUTION NAPS40 SER. M2110051 V1 Figure MD-3: NAPS40 PS Distribution PWB Issue 10.0 2019-01-18 MD-3...
  • Page 95 INTERFACE NAPI131 SER. M2110053 V1 Figure MD-4: NAPI131 Interface PWB Issue 10.0 2019-01-18 MD-4...
  • Page 96 NAPA27 SER. M2110046 V1 Figure MD-5: NAPA27A Pre-Amp PA PWB Issue 10.0 2019-01-18 MD-5...
  • Page 97 Figure MD-6: NAPA23/03A PA PWB Issue 10.0 2019-01-18 MD-6...
  • Page 98 LOW PASS FILTER NAPF11 SER. M2110044 V1 Figure MD-7: NAPF11 RF Low Pass Filter PWB Issue 10.0 2019-01-18 MD-7...
  • Page 99 OUTPUT POWER PROBE NAPP06 SER. M2110049 V1 Figure MD-8: NAPP06 Output Power Probe PWB Issue 10.0 2019-01-18 MD-8...

  • Page 100: List Of Terms

    List of terms Section 7: List of terms This section defines some of the terms that are used in Nautel documentation. Audio Engineering Society/European Broadcasting Union (AES/EBU) is the name AES-EBU. of a digital audio transfer standard. The AES/EBU digital interface is usually implemented using 3-pin XLR connectors (the same type connector used in professional microphones).
  • Page 101 VS300 Troubleshooting Manual List of terms A setting that controls power level, frequency and audio parameters. The VS300 allows Preset. you to pre-program multiple presets. Printed Wiring Board. PWB. A complete, but temporary loss of RF output power, caused by any one of a Shutback.
  • Page 103 Phone: +1.902.823.3900 or Fax: +1.902.823.3183 Nautel Inc. 201 Target Industrial Circle Bangor, Maine USA 04401 Phone: +1.207.947.8200 Fax: +1.207.947.3693 Customer Service (24-hour support) +1.877.628.8353 (Canada & USA only) +1.902.823.5100 (International) Email: support@nautel.com Web: www.nautel.com © Copyright 2019 NAUTEL. All rights reserved.

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