YOKOGAWA DL2700 Series Service Manual
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YOKOGAWA DL2700 Series Service Manual

YOKOGAWA DL2700 Series Service Manual

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Service
Manual
Yokogawa Electric Corporation
Model 7008
DL2700 Series
Digital Oscilloscope
SM 700820-01E
SM 700820-01E
2nd Edition

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Summary of Contents for YOKOGAWA DL2700 Series

  • Page 1 Service Manual Model 7008 DL2700 Series Digital Oscilloscope SM 700820-01E SM 700820-01E 2nd Edition Yokogawa Electric Corporation...

  • Page 2: Important Notice To The User

    IMPORTANT NOTICE TO THE USER This manual contains information for servicing the YOKOGAWA Digital Oscilloscope DL2700 series. Confirm by serial number that this Service Manual covers the instru- ment to be serviced. Do not use the wrong manual. Before any maintenance and servicing, read all safety precautions carefully.

  • Page 3: Introduction

    YOKOGAWA instruments have been designed in a way that the replacement of elec- tronic 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 4 Power Cord and Plug To prevent an electric shock or fire, be sure to use the power supply cord supplied by YOKOGAWA. The main power plug must be plugged in an outlet with protective grounding terminal. Do not invalidate protection by using an extension cord without protective grounding.

  • Page 5: How To Use This Manual

    Do not Operate in an Explosive Atmosphere Do not operate the instrument in the presence of flammable liquids or vapors. Operation of any electrical instrument in such an environment constitutes a safety hazard. Do not Remove any Covers There are some areas with high voltage. Do not remove any cover if the power supply is connected.

  • Page 6: Table Of Contents

    CONTENTS IMPORTANT NOTICE TO THE USER ............INTRODUCTION ....................SAFETY PRECAUTIONS .................. HOW TO USE THIS MANUAL ................. Chapter 1 GENERAL INFORMATION ................1 - 1 1.1 Introduction ....................1 - 1 1.2 Safety Consideration .................. 1 - 1 Chapter 2 PERFORMANCE TEST ..................2 - 1 2.1 Introduction ....................

  • Page 7: Chapter 1 General Information

    DL2700 series. This chapter contains information required for using this manual and information that must be known before starting servicing of the DL2700 series. 1.2 Safety Consideration Thoroughly read the safety precautions at the beginning of this manual without fail.

  • Page 8: Chapter 2 Performance Test

    2.1 Introduction Chapter 2 PERFORMANCE TEST This chapter describes the following tests. 2.1 Introduction 2.2 Test Environment 2.3 Equipment Required 2.4 Self-diagnosis 2.5 Vertical axis DC voltage Accuracy Test 2.6 Frequency Response Test 2.7 Time-base Accuracy Test 2.8 Trigger Sensitivity Test 2.9 Trigger Accuracy Test 2.10 Logic input function Test 2.1 Introduction...

  • Page 9: Equipment Required

    100 kHz to 150 MHz HP 437B Power sensor 100 kHz to 150 MHz HP8482A Function generator Triangular wave, 100 kHz, 800 mV Yokogawa 7060 50Ω terminator HP,1251-2277 Conversion adaptor Banana plug to BNC Yokogawa 3669 22 N-BNC conversion adaptor...
  • Page 10 2.3 Equipment Required for Performance Testst Connection DL2700 DC Voltage Generator CH 1 to 8 Conversion Adapter Cable Procedure 1) Turn on the power source of the DL2700. After warm-up press the CAL key, then press the “Calibration” soft key to calibrate the instrument. Furthermore, press the INITIALIZE key, then press the “Initialize”...

  • Page 11: Frequency Response Test

    N-BNC conversion adaptor N plug to BNC jack HP 1250-0780 BNC-N conversion adaptor N jack to BNC jack HP 1250-1474 Cable BNC to BNC Yokogawa 3669 24 Calibration of standard signal generator Connection Power Meter Standard Signal Generator Power Sensor N-BNC BNC-N...
  • Page 12 2.6 Frequency Response Test Procedure Output the signals at the following frequencies and output levels from the standard signal generator and measure the output level with the power meter. Output frequency Output level 0.1 MHz –20 dBm, 10 dBm 20.02 MHz –20 dBm, 10 dBm 150.02 MHz –20 dBm, 10 dBm...

  • Page 13: Time-Base Accuracy Test

    0.1 MHz to 150 MHz 50Ω terminator HP 1251-2277 N-BNC conversion adaptor N plug to BNC jack HP 1250-0780 Cable BNC to BNC Yokogawa 3669 24 Connection DL2700 Standard Signal Generator CH 1 to 8 N-BNC 50 ohm Termination Conversion Adapter...

  • Page 14: Trigger Sensitivity Test

    Equipment Mandatory specifications Recommended Standard signal generator Output frequency range HP 8657A 150 MHz 50Ω terminator HP 1251-2277 N-BNC conversion adaptor N plug to BNC jack HP 1250-0780 Cable BNC to BNC Yokogawa 3669 24 2 - 7 SM 700820-01E...

  • Page 15: Trigger Accuracy Test

    Connection DL2700 Standard Signal Generator CH 1 to 8 50 ohm Termination N-BNC Conversion Adapter Cable Procedure 1) Turn on the power source of the DL2700. After warm-up press the CAL key, then press the “Calibration” soft key to calibrate the instrument. Furthermore, press the INITIALIZE key, then press the “Initialize”...
  • Page 16 –100 mV to 100 mV –300 mV –430 mV to –170 mV Equipment required Equipment Mandatory specifications Recommended Function generator Triangular wave, 100 kHz, 800 mV Yokogawa 7060 50Ω terminator HP 1251-2277 Cable BNC to BNC Yokogawa 3669 24 Connection DL2700...

  • Page 17: Logic Input Function Test

    4) Test all channels in the same manner. 2.10 Logic Input Function Test Equipment required Equipment Mandatory specifications Recommended Probe 150 MHz frequency range Yokogawa 700998 Logic Probe 8 bit Yokogawa 700985 Connection DL2700 Logic Probes Input (Red) Gnd. (Black)
  • Page 18 2.10 Logic Input Function Test 9) Press the ENHANCED key. 10)Press the Type and select the “Logic” option. 11)Set the “Condition” to “True” and set the 1 bit status of POD A to “H”. The other bits and the bits of the other POD are set to “X”. 12)Connect the 1 bit probe of POD A to the CAL terminal.

  • Page 19: Chapter 3 Adjustments

    3.1 Introduction Chapter 3 ADJUSTMENTS This chapter describes the following tests. 3.1 Introduction 3.2 Test Environment 3.3 Equipment Required 3.4 Dip Switch Setting of the CPU board 3.5 Rotary Switch Setting of the Printer board 3.6 Power Supply Adjustment 3.7 Flatness Adjustment on the Attenuator board 3.8 DC Gain Adjustment on the AFC board 3.9 Start-able Oscillator Adjustment 3.1 Introduction...
  • Page 20 YOKOGAWA FG120 Output Level : >12 Vp-p Frequency Counter Frequency : >100 MHz YOKOGAWA TC110 Accuracy : < 0.005% BNC-BNC Cable YOKOGAWA 3669 24 Clip-BNC Cable YOKOGAWA 3669 26 50 ohm Terminators Feed Thru Type YOKOGAWA 7009 76 NOTE The values shown in the specification column are those set in this service manual.
  • Page 21 3.6 Power Supply Adjustment 3.6 Power Supply Adjustment Procedure 1) Remove the main unit covers. 2) Turn the unit upside down and remove all coaxial cables from the attenuator boards. 3) Turn the unit again and remove three fixing plates, the printer case (cut the cable bind) and the plate under the printer.
  • Page 22 9) After checking the connection correct, turn the POWER switch ON. Be careful of the parts of the Power Supply which generates high voltages. 10) Adjust the variable resistor (VR501 refer to Figure 3.1 and 3.2 Adjustment point location diagram) so that the measuring voltage fits within -5.3±0.1V. In order to avoid electric shock or fire hazard, do not use metallic screwdriver for adjustment.
  • Page 23 3.7 Flatness Adjustment on the Attenuator board 3.7 Flatness Adjustment on the Attenuator board NOTE Before performing this Flatness adjustment, the Power supply adjustment must have been completed. Procedure 1) Remove the main unit cover and the two fixing plates. 2) Turn power on and allow the unit to warm up for 20 minuets or more.
  • Page 24 9) Adjust the variable capacitors (C104 and C204, refer to Figure 3.4 Adjustment point location diagram) so that the top of the waveform becomes flat as shown in Figure 3.5 Observed waveform. The flatness of the waveform must be fitted within ±0.1 div. 10)For adjustment of the /100 range, set up the DL2700 and Function Generator as follows.
  • Page 25 3.8 DC Gain Adjustment on the Analog Assembly Figure 3.5 Observed waveform 3.8 DC Gain Adjustment on the Analog Assembly NOTE Before performing this DC gain adjustment, the Flatness adjustment of the Attenuator Board must have been completed. Procedure 1) Remove the main unit cover and the two fixing plates.. 2) Allow the unit to warm up for 15 minutes or more.
  • Page 26 6) Set up the DL2700 and DC Voltage Standard as follows. DL2700 Ch 1 - 8 Probe: Volt/div: 2 mV/div Position: 0 div Offset: +1.000V T/div: 100 us/div Acquisition: Box Average Measure Trace 1 - 8: DC Voltage Standard Output Level: +1.0000V 7) Adjust the variable resistor (refer to Table 3.2 Adjustment point and Figure 3.7 Adjust- ment point location diagram) corresponding to each channel so that the DC wave form...
  • Page 27 3.8 DC Gain Adjustment on the Analog Assembly RV303 RV304 RV302 RV301 Figure 3.7 Adjustment point location diagram 3 - 9 SM 700820-01E...
  • Page 28 Figure 3.8 Observed waveform 3.9 Start-able Oscillator Adjustment on the Trigger Assembly Procedure 1) Remove the unit cover, front panel, and bottom plate. 2) Hold the [MISC] key in and turn on the power and allow the unit to warm up for 15 minutes or more.
  • Page 29 3.9 Start-able Oscillator Adjustment on the Trigger Assembly R423 TP401 Figure 3.10 Adjustment point location diagram 3 - 11 SM 700820-01E...

  • Page 30: Chapter 4 Principle Of The Operation

    4.1 Introduction Chapter 4 PRINCIPLE OF THE OPERA- TION This chapter describes the following tests. 4.1 Introduction 4.2 Analog Section 4.3 Digital Section 4.4 Functions of Each Gate Array 4.1 Introduction Figure 4.1 shows the block diagram of the analog section in the DL2700 and Figure 4.2 shows that of the digital section in the same instrument.

  • Page 31: Digital Section

    AFC Board Assembly The AFC Board Assembly consists of the AFC (Analog Front-end Controller), the D/A converter, the Trigger compactor, the TV Trigger circuits, and so on. The AFC generates the control signals for the ATT Board Assembly and the Trigger circuit.
  • Page 32 4.3 Digital Section Memory Board Assembly The Memory Board Assembly contains two channels memories for acquisition. There are three kinds of assembly according to the model of the record length. • Model 7008_1 (500 kW/CH model): MEM 512k Board Assembly •...

  • Page 33: Functions Of Each Gate Array

    (13) Rear Assembly The EXT TRIG IN/EXT CLOCK IN and TRIG OUT circuits are installed. (14) Power Board Assembly The Power Board distributes two power supply lines from AC line. (15) LCD Assembly 8.4 inch color TFT LC display × Full display resolution: 640 ×...
  • Page 34 4.4 Functions of Each Gate Array Synthesized Timing Generator (STG) It is the ECL gate array which aims to implement the clock signal supply, the trigger synchronizing, the time measuring. Time to Voltage Converter (TVC) It is the Analog IC which aim to execute the T-V converting for time measuring between the sampling clock and trigger signal.
  • Page 35 Figure 4.1 Block diagram (analog section) 4 - 6 SM 700820-01E...
  • Page 36 4.4 Functions of Each Gate Array Figure 4.2 Block diagram (digital section) 4 - 7 SM 700820-01E...

  • Page 37: Chapter 5 Troubleshooting

    5.1 Introduction Chapter 5 TROUBLESHOOTING This chapter describes the following tests. 5.1 Introduction 5.2 Flowchart 5.3 Self Test 5.3.1 Self Test (Memory_System) 5.3.2 Self Test (Memory_ACQ RAM) 5.3.3 Self Test (Key Board) 5.3.4 Self Test (Printer) 5.1 Introduction This chapter describes possible solutions for rectifying errors. In such cases, assembly removal may be required.

  • Page 38: Flowchart

    5.2 Flowchart ‘Figure 5.1 Troubleshooting flowchart’ shows an analytical method for handling trouble occurrence. START Power ON Display? Message displayed? Excute Self-test Self-test normal Execute Performance Test Performance test normal? Figure 5.1 Troubleshooting flowchart 5 - 2 SM 700820-01E...
  • Page 39 Replace Back Light Unit Replace Video Board Replace LCD Ass'y Ass'y Maintenance Service is Required Contact your nearest YOKOGAWA representative as listed on the back cover of this manual. Figure 5.2 Troubleshooting flowchart for display unit 5 - 3 SM 700820-01E...
  • Page 40 (1)’ 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 41 5.2 Flowchart When a trouble has occurred, it is necessary to refer to the Instruction Manual, to determine whether the trouble is caused by erroneous operation or by a defect in the hardware. Table 5.2 Correspondence of messages to defective assemblies shows where a trouble occurrence may be due to a hardware failure.

  • Page 42: Self Test

    When a trouble has occurred, check the non-conforming test item and select the relevant defective assembly from Table 5.4 Correspondence of test items to defective assem- blies. If necessary, replace the relevant assembly. Table 5.4 Correspondence of test items to defective assemblies Test item Assembly 2.5 Vertical Axis DC Voltage Accuracy Test...

  • Page 43: Self Test (Memory_System)

    5.3 Self Test Moreover, repeat pressing “Memory Test” option to select “System” or “ACQ RAM” in the Memory test. Figure 5.4 Memory test item 5.3.1 Self Test (Memory_System) The Memory (System) test is performed and its result is displayed. When the test has been completed normally, “Pass”...

  • Page 44: Self Test (Memory_Acq Ram)

    5.3.2 Self Test (Memory_ACQ RAM) The Memory (ACQ RAM) test is performed and its result is displayed. When the test has been completed normally, “Pass” is displayed on the screen (refer to Figure 5.6). When the test detects a problem, “Failed” is displayed on the screen. Refer to the Table 5.3 to choose the relevant defective assembly.

  • Page 45: Self Test (Printer)

    5.3.4 Self Test (PRINTER) 5.3.4 Self Test (PRINTER) Where the DL2700 series is equipped with the optional printer (/B5), print out the patterns shown in “Figure 5.7 Printer print patterns” on the printing paper. 1 Vertically printed lines on alternate dots...

  • Page 46: Chapter 6 Schematic Diagram

    Chapter 6 SCHEMATIC DIAGRAM 6 - 1 SM 700820-01E...
  • Page 47 6 - 2 SM 700820-01E...
  • Page 48 6 - 3 SM 700820-01E...
  • Page 49 6 - 4 SM 700820-01E...
  • Page 50 6 - 5 SM 700820-01E...
  • Page 51 6 - 6 SM 700820-01E...

  • Page 52: Chapter 7 Customer Maintenance Parts List

    7.1 Customer Maintenance Parts List Chapter 7 CUSTOMER MAINTENANCE PARTS LIST 7.1 Customer Maintenance Parts List 7.2 Standard Accessories 7.1 Customer Maintenance Parts List 7 - 1 SM 700820-01E...
  • Page 53 11 12 Item Part No. Description Item Part No. Description Bezel Assembly (see page 5) A9084ZM Foot Y9305LB B.H.Screw,M3x5 Y9418LB B.H.Screw,M4x18 B9919CY Bottom Cover Y9305LK Machine Screw A9086ZM Support B9917FE Bezel Assembly (/B5) A9069ZB Sheet A9078ZM Lever (/B5) A9068ZB A9074ZM Bezel (/B5) A9102ZM Foot Assembly...
  • Page 54 7.1 Customer Maintenance Parts List (27) 7 - 3 SM 700820-01E...
  • Page 55 Item Part No. Description B9929DL ATT Assembly (70082 ) B9929DL ATT Assembly (70084 ) (select) B9929DL ATT Assembly (70086 ) B9929DL ATT Assembly (70088 ) B9929LC AFC Board Assembly (70082 ,70084 ) (select) B9929LC AFC Board Assembly (70086 ,70088 ) B9929KG Logic Assembly (/F2) B9929LM...
  • Page 56 7.1 Customer Maintenance Parts List Bezel Assembly Alengement of item 11 Knobs Item Part NO. Description B9929DF Bezel Assembly B9929BS Sheet (70082 ) B9929BT Sheet (70084 ) (select) 700883 700863 700843 700823 B9929BU Sheet (70086 ) 700882 700862 700842 700822 B9929BV Sheet (70088 ) 700881...

  • Page 57: Standard Accessories

    7.2 Standard Accessories Item Part NO. Description A1006WD 1 1 1 1 Power Supply Code (UL.CSA standard) *1,*2 A1253JZ 1 1 1 1 3P-2P Adapter *1 (select) 1 1 1 1 Power Supply Code (VDE standard) *3 A1009WD 1 1 1 1 A1054WD Power Supply Code (BS standard) *4 A1024WD...

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