YOKOGAWA DL1720 Service Manual
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YOKOGAWA DL1720 Service Manual

YOKOGAWA DL1720 Service Manual

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Service
Manual
DL1720/DL1740
Digital Oscilloscope
SM 701710-01E
SM 701710-01E
4th Edition

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Summary of Contents for YOKOGAWA DL1720

  • Page 1 Service Manual DL1720/DL1740 Digital Oscilloscope SM 701710-01E SM 701710-01E 4th Edition...

  • Page 2: Important Notice To The User

    YOKOGAWA instruments have been designed in a way that the replacement of electronic parts can be done on an assembly (module) basis by the user. YOKOGAWA instruments have also been designed in a way that troubleshooting and replacement of any faulty assembly can be done easily and quickly.

  • Page 3: Introduction

    Failure to comply with these precautions or with specific warnings given elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Yokogawa Electric Corporation assumes no liability for the customer’s failure to comply with these requirements. WARNING...
  • Page 4 Use the Correct Fuse To prevent fire, make sure to use a fuse of the specified rating for current, voltage, and type. Before replacing the fuses, turn OFF the power and disconnect the power source. Do not use a different fuse or short-circuit the fuse holder.

  • Page 5: Overview Of This Manual

    Overview of This Manual This manual is meant to be used by qualified personnel only. Make sure to read the safety precautions at the beginning of this manual as well as the warnings and cautions contained in the chapters relevant to any servicing you may be carrying out. This manual contains the following chapters.

  • Page 6: Table Of Contents

    Contents Important Notice to the User ......................1 Introduction ............................. 2 Safety Precautions ......................... 2 Overview of This Manual ........................ 4 Chapter 1 General Information 1.1 Introduction ........................... 1-1 1.2 Safety Considerations ......................1-1 Chapter 2 Performance Testing 2.1 Introduction ........................... 2-1 2.2 Test Environment ........................
  • Page 7 Contents Chapter 7 Customer Maintenance Parts List 7.1 Customer Maintenance Parts List ..................7-1 7.2 Standard Accessories ......................7-5 Chapter 8 Procedures for Disassembly 8.1 Removing the Top Cover ...................... 8-1 8.2 Removing the Printer Case ....................8-3 8.3 Removing the Front Bezel ....................8-5 8.4 Removing the AD Board Assembly and the Analog Assembly ..........

  • Page 8: Chapter 1 General Information

    1.1 Introduction This manual describes servicing information for any YOKOGAWA DL1720 and DL1740 Digital Oscilloscope. This chapter contains information required for using this manual and information that must be read before starting servicing DL1720 and DL1740 instruments. 1.2 Safety Considerations You must thoroughly read the safety precautions at the beginning of this manual.

  • Page 9: Chapter 2 Performance Testing

    Chapter 2 Performance Testing 2.1 Introduction The aim of the tests in this chapter is to check the basic performance of the instrument. The order of the test procedures is just for convenience and does not need to be adhered to strictly. Please use the recommended equipment or their equivalents. 2.2 Test Environment Operating Conditions •...

  • Page 10: Vertical Axis Dc Voltage Accuracy Test

    Calibrator Programable Head Procedure Turn on the power source to the DL1720/DL1740. After warm-up press the MISC key, followed by the Calibration soft key, then press the Cal Exec soft key to calibrate the instrument. Next, press the SETUP key, then press the Initialize soft key to initialize the settings.

  • Page 11: Frequency Response Test

    –5 div Time Range 2 +5 div Input the following voltages from the voltage generator to the DL1720/DL1740 being tested, read the indication on the DL1720/DL1740 (value of Avg), and compare the reading with the tolerance. Measurement Range Test Input Voltage...
  • Page 12 Calibrator Programable Head Procedure Turn on the power source to the DL1720/DL1740. After warm-up press the MISC key, followed by the Calibration soft key, then press the Cal Exec softkey to calibrate the instrument. Next, press the SETUP key, then press the Initialize soft key to initialize the settings.

  • Page 13: Time-Base Accuracy Test

    2.6 Frequency Response Test / 2.7 Time-Base Accuracy Test Input voltages as listed on the following table to the DL1720/DL1740 you are testing, and check if the automatically measured value of waveform parameters (Sdev) is within the permissible range. Range...

  • Page 14: Trigger Sensitivity Test

    Select Freq Input a 300 mVp-p sine wave signal with the input frequency listed in the table below to the DL1720/DL1740 you are testing, and check if the automatically measured waveform parameters (Freq) are within the permissible range. Time Range...
  • Page 15 Count Infinite Weight Input a sine wave signal of 500 mVp-p, 500 MHz to the DL1720/DL1740, and confirm that the waveform stabilizes. Note If the trigger is not activated, adjust the trigger lever within ±250 mV until the trigger is activated.

  • Page 16: Trigger Accuracy Test

    Calibrator Programable Head Procedure Turn on the power source to the DL1720/DL1740. After warm-up press the MISC key, followed by the Calibration soft key, then press the Cal Exec softkey to calibrate the instrument. Next, press the SETUP key, then press the Initialize soft key to initialize the settings.
  • Page 17 Position 0.0 div Input a sine wave signal of 400 mVp-p, 2 kHz to the DL1720/DL1740 oscilloscope, and use cursors to read the voltage of the waveform at the trigger position. Set Vin for Polarity IN, Vout for Polarity out, and check if (Vin+Vout)/2 is within the permissible range.

  • Page 18: Chapter 3 Adjustments

    Do not drop the instrument, or allow it to fall over. • When feeding power with the DL1740’s cover open, apply a flow of air to the AD4 board (or the AD2 board for the DL1720) and Power Supply (B9989YA).

  • Page 19: Equipment Required

    Procedure Remove the top cover and shield cover. Allow the unit to warm up for 10 minutes or more. Connect each instrument as shown in figure 3.1, “Connection Method.” DL1720/DL1740 Calibrator Programable Head Figure 3.1 Connection Method Press the SETUP key and select the Initialize soft key to execute initialization.
  • Page 20 3.4 DC Gain Adjustment on the AD Board Enter the settings on the DL1720/DL1740 and calibrator as follows. DL1720/DL1740 VERTICAL (for all channels) V/div 2 mV/div Position 0 div Probe Offset +1.000 V Bandwidth 20 MHz HORIZONTAL T/div 1 ms/div...
  • Page 21 3.4 DC Gain Adjustment on the AD Board R714 R707 Figure 3.2 Adjustment Point Location Diagram (DL1720) SM 701710-01E...
  • Page 22 3.4 DC Gain Adjustment on the AD Board R728 R721 R714 R707 Figure 3.3 Adjustment Point Location Diagram (DL1740) SM 701710-01E...

  • Page 23: Flatness Adjustment On The Analog Board

    Remove the top cover, printer cover, printer case, front bezel, and shield cover. Turn on the power and allow the unit to warm up for 10 minuets or more. Connect each instrument as shown in figure 3.5, “Connection Method.” DL1720/DL1740 Calibrator Programable Head Figure 3.5 Connection Method...
  • Page 24 3.5 Flatness Adjustment on the Analog Board For adjustment of the /10 range, enter the settings on the DL1720/DL1740 oscilloscope and calibrator as follows. DL1720/DL1740 VERTICAL (for all channels) V/div 100 mV/div Position 0 div Probe HORIZONTAL T/div 10 µ s/div...
  • Page 25 3.5 Flatness Adjustment on the Analog Board For adjustment of the /200 range, enter the settings on the DL1720/DL1740 oscilloscope and calibrator as follows. DL1720/DL1740 VERTICAL (for all channels) V/div 10 V/div Position 0 div Probe HORIZONTAL T/div 10 µ s/div...
  • Page 26 3.5 Flatness Adjustment on the Analog Board Figure 3.7 Observed Waveform SM 701710-01E...

  • Page 27: Chapter 4 Principles Of Operation

    Chapter 4 Principles of Operation 4.1 Introduction The block diagrams of the DL1720 are shown in figure 4.1 and figure 4.2. The block diagrams of the DL1740 are shown in figure 4.3 and figure 4.4. Figure 4.1 and figure 4.3 are block diagrams of the circuit from the analog input to the...
  • Page 28 4.2 Function of Each Assembly AD4 Board (or AD2 Board for the DL1720) Assembly The AD4 board (or AD2 board for the DL1720) assembly has the time base, trigger, A/D converter, and analog control circuits onboard. The time base is of a PLL configuration. 1 GHz and 800 MHz can be switched. On the DL1720/DL1740, the frequency of the clock is converted to 500 MHz or 400 MHz using high-speed ECL logic and distributed to each channel.
  • Page 29 Controls the exchange of signals between the CPU, KEY, ACQ4 (or the ACQ2 for the DL1720), and AD board assemblies and a printer assembly. Supplies output from the power supply unit to the CPU, KEY, ADP and ACQ4 board (or the ACQ2 board for the DL1720) assemblies and a printer assembly.

  • Page 30: Function Of Each Asic

    4.2 Function of Each Assembly/4.3 Function of Each ASIC Zip Board Assembly (-J2) The Zip board assembly is an adapter which connects the Zip drive to the CPU board. I/F Board Assembly (Optional) The I/F board assembly supports both SCSI I/F and serial I/F, and is controlled by the CPU and CPU I/O interface (CIO) on the CPU board.
  • Page 31 4.3 Function of Each ASIC Graphic Control Processor (GCP) The GCP is a CMOS gate array. Its functions include interfacing to the acquisition memory interface (AMI), graphic memory and character memory control, a waveform drawing function (accumulated display, for example), built-in printer control, and display data generation for the LCD.
  • Page 32 4.3 Function of Each ASIC Figure 4.1 Block Diagram (Analog Section) of the DL1720 SM 701710-01E...
  • Page 33 4.3 Function of Each ASIC Figure 4.2 Block Diagram (Digital Section) of the DL1720 SM 701710-01E...
  • Page 34 4.3 Function of Each ASIC Figure 4.3 Block Diagram (Analog Section) of the DL1740 SM 701710-01E...
  • Page 35 4.3 Function of Each ASIC Figure 4.3 Block Diagram (Digital Section) of the DL1740 SM 701710-01E...

  • Page 36: Chapter 5 Troubleshooting

    Chapter 5 Troubleshooting 5.1 Introduction This chapter describes possible solutions for rectifying errors. In such cases, assembly removal may be required. Please heed the following warning. WARNING Assembly replacement is to be performed only by qualified service technicians who have experience working with the hazards involved (such as fire and electrical shock).
  • Page 37 DL1720/DL1740 while pressing the RESET test results. key. ‡ The monitor to be connected must be VGA supported. Maintenance Service is Required Contact your nearest YOKOGAWA representative as listed on the back cover of this manual. Figure 5.1 Troubleshooting Flowchart SM 701710-01E...
  • Page 38 5.2 Flowchart A short may occur in an assembly other than the power supply unit. To check in which voltage line a short has occurred, investigate each assembly to which voltage is supplied, using a circuit tester. Table 5.1 “Correspondence of Assembly to Voltage” shows the relationship between assemblies and voltages supplied to them.
  • Page 39 5.2 Flowchart When trouble occurs, refer to the user’s manual to determine whether the trouble was caused by erroneous operation or by a hardware defect. Table 5.2, “Correspondence of Messages to Defective Assemblies,” shows which kind of trouble may be due to a hardware failure.

  • Page 40: Power Supply Secondary Voltage

    5.2 Flow Chart/5.3 Power Supply Secondary Voltage When trouble occurs, check the non-conforming test and select the relevant defective assembly from table 5.4, “Correspondence of Test Items to Defective Assemblies.” If necessary, replace the relevant assembly. Table 5.4 Correspondence of Test Item to Defective Assemblies Test item Assembly No.

  • Page 41: Self Test

    5.4 Self Test 5.4 Self Test After turning the power ON, first press the MISC key and then the Next 1/2 soft key. Press the Self Test soft key and then the Test Item soft key to display the Self Test menu screen (figure 5.3).

  • Page 42: Memory Test

    5.4 Self Test 5.4.2 Memory Test After the memory test is performed, the results are displayed. When the test has been completed and no problems were detected, Pass is displayed on the screen (refer to figure 5.5). If a problem was detected, Failed is displayed on the screen. Refer to table 5.3 to select the relevant defective assembly.

  • Page 43: Zip Test

    5.4 Self Test 5.4.4 Zip Test After the Zip test is performed, the results are displayed. Insert a Zip disk into the drive before excuting the test. If the test has been completed and no problems were detected, Pass is displayed on the screen (refer to figure5.7). If a problem was detected, Failed is displayed on the screen.

  • Page 44: Printer Test

    5.4 Self Test 5.4.6 Printer Test If the DL1720/DL1740 is equipped with the optional printer (/B5), print out the patterns shown in figure 5.9, “Printer Print Patterns” on the printing paper. 1: Vertically printed lines on alternate dots 2: Checkered pattern every other dot...

  • Page 45: Accuracy Test

    5.4 Self Test 5.4.7 Accuracy Test After the accuracy test is performed, the results are displayed. When the test has been completed and no problems were detected, Pass is displayed on the screen (refer to figure 5.10). If a problem was detected, Failed is displayed on the screen. Refer to the table 5.3 to select the relevant defective assembly.

  • Page 46: Chapter 6 Schematic Diagram

    Chapter 6 Schematic Diagram * The assembly number differs depending on the date of manufacture as follows: During or before December, 2001: B9989MA After December, 2001 : B9989ML Figure 6.1 Schematic Diagram of the DL1720/DL1740 SM 701710-01E...

  • Page 47: Chapter 7 Customer Maintenance Parts List

    Chapter 7 Customer Maintenance Parts List 7.1 Customer Maintenance Parts List Note: Parts marked with a symbol are CMPL (Customer Maintenance Parts List) parts. SM 701710-01E...
  • Page 48 7.1 Customer Maintenance Parts List Complete Set Item Part No. Description Item Part No. Description B9989EC Support B9989ER Sheet (701710) Sheet (701705) B9989DA Top Cover B9989EY (select) Y9408LB B.H. Screw, M4x8 B9989ES Sheet (/P2) Sheet (/P4) Y9408LB B.H. Screw, M4x8 B9989ET B9989EC Support...
  • Page 49 7.1 Customer Maintenance Parts List 23 24 SM 701710-01E...
  • Page 50 7.1 Customer Maintenance Parts List Item Part No. Description B9989DY Knob B9989DX Knob B9989DK Knob B9989DL Knob B9989EL Spring B9969DK Lens B9989DM Knob B9989DD Front Bezel (701710) B9989DF Front Bezel (701705) (select) B9989DP Front Bezel (701710 /F5) B9969DE Knob B9989SD Switch and Cable Assembly (AD-Switch) A1056VA Y9205LB...

  • Page 51: Standard Accessories

    Note: 701705/701710 - B9918EZ Soft Case † 701705/701710 - 701705/701710 - IM701710-01E DL1720/DL1740 Digital Oscilloscope User’s Manual ‡ IM701710-02E DL1720/DL1740 Digital Oscilloscope Operation Guide § 701705/701710 - IM701710-51E A roll chart will be DL1740 Digital Oscilloscope I2C Bus Analysis Function...

  • Page 52: Chapter 8 Procedures For Disassembly

    Refer to the safety precautions prior to performing any servicing. Even if servicing is carried out according to this service manual, or by qualified personnel, YOKOGAWA assumes no responsibility for any result occurring from that servicing.
  • Page 53 8.1 Removing the Top Cover The top cover fits into the back of the front bezel. Remove the top cover by slowly pulling it away from the front bezel in the direction of the arrows as shown in the figure below. The DL with the top cover removed SM 701710-01E...

  • Page 54: Removing The Printer Case

    8.2 Removing the Printer Case 8.2 Removing the Printer Case Remove the top cover. See section 8.1, “Removing the Top Cover.” Remove the printer cover by raising it in the direction of the arrow as shown below, then forcing it back until it pops out. Remove the screw from the printer case located toward the rear of the instrument.
  • Page 55 8.2 Removing the Printer Case Lift the printer case to remove it, allowing the handle to slide through the opening in the case. DL with the printer case removed SM 701710-01E...

  • Page 56: Removing The Front Bezel

    8.3 Removing the Front Bezel 8.3 Removing the Front Bezel Removing the Knobs Remove the knobs by pulling them outward in the direction of arrows. Note When the TIME/DIV and V/DIV knobs are removed, the “rib“ holding the knob to its shaft becomes worn down causing the knob to become loose.
  • Page 57 8.3 Removing the Front Bezel Removing the Front Bezel Remove the top cover. See section 8.1, “Removing the Top Cover.” Remove the printer case. See section 8.2, “Removing the Printer Case.” The front bezel is fastened to the frame by eight tabs. Identify the location of all tabs, then pry each tab away from the metal frame one-by-one until the bezel comes free of the frame.

  • Page 58: Removing The Ad Board Assembly And The Analog Assembly

    8.4 Removing the AD Board Assembly and the Analog Assembly 8.4 Removing the AD Board Assembly and the Analog Assembly Removing the Bottom Brackets Remove the top cover. See section 8.1, “Removing the Top Cover.” Remove the front bezel. See section 8.3, “Removing the Front Bezel.” Remove the screws from the left, right, and rear sides (3 screws total), then remove the bottom brackets.

  • Page 59: Removing The Fan Assembly

    8.4 Removing the AD Board Assembly and the Analog Assembly Removing the Fan Assembly Holding the fan assembly cable by its connector (not the cable itself), disconnect the fan assembly cable. Unhook the cable from the plastic restraining tab. Remove the 2 screws as shown, then lift the fan assembly upwards and remove it. Be careful not to pull out the wires as you do so.
  • Page 60 8.4 Removing the AD Board Assembly and the Analog Assembly Grasp the SUMI-card near the connector with both hands, then slowly pull it out. Be careful not to bend the card as you do so. DL with the ADP board assembly and the SUMI-card removed Removing the AD Board Assembly and the Analog Assembly Remove the 5 screws from the left side of the instrument as shown in the figure below.
  • Page 61 8.4 Removing the AD Board Assembly and the Analog Assembly Remove the 4 screws from the right side of the instrument as shown in the figure below. Turn the unit upside down. Remove the cables from the left and right sides as shown in the figure below. Remove the 2 screws from the front panel as shown.
  • Page 62 8.4 Removing the AD Board Assembly and the Analog Assembly The ACQ board assembly is fastened to the bus board assembly underneath by several connectors. The AD board assembly and the analog assembly cannot be removed until you disconnect these connectors. Pull the front side (the side with the BNC connectors) of the AD board assembly upwards to disconnect it from the bus board assembly.

  • Page 63: Removing The Power Supply

    8.5 Removing the Power Supply 8.5 Removing the Power Supply Perform the steps in sections 8.3 and 8.4. Remove the 2 screws as shown. Remove the 2 screws as shown. Pull out the power supply in the direction of the arrow as shown below. SM 701710-01E 8-12...
  • Page 64 8.5 Removing the Power Supply DL with the power supply removed. SM 701710-01E 8-13...

  • Page 65: Removing The Cpu Board Assembly, Scsi Board Assembly, And The Ether Assembly

    8.6 Removing the CPU Board Assembly, SCSI Board Assembly, and the Ether Assembly 8.6 Removing the CPU Board Assembly, SCSI Board Assembly, and the Ether Assembly Remove the SUMI-card connected to either the floppy drive or the ZIP drive. Unhook the connector then remove the SUMI-Card. The SUMI-card is thin and fragile, so take care not to bend it when removing it.
  • Page 66 8.6 Removing the CPU Board Assembly, SCSI Board Assembly, and the Ether Assembly Remove the screw as shown in the figure below. Pull out the CPU board assembly. The SCSI board assembly and Ether assembly are attached to the CPU board assembly, so they come out all together.

  • Page 67: Removing The Front Frame

    8.7 Removing the Front Frame 8.7 Removing the Front Frame Peform the steps in section 8.1 to 8.6. Remove the 2 screws that fasten the front frame to the rear panel. Remove the SUMI-Card on the right side of the frame. Remove the 5 screws that fasten the front frame to the front panel.

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