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3-1

SM 701730-01E

Adjustments

Chapter 3

Adjustments

3.1

Introduction

The top cover, printer cover, printer case, front bezel, and shield cover must be removed

before adjusting the DL1720E/DL1740E/DL1740EL. Read the warning and cautions

below before doing so.

WARNING

Circuit patterns of the printed circuit board are exposed. Be careful when

handling so that hands or fingers are not injured by the protruding pins.

CAUTION

• Circuit patterns of the printed circuit board are exposed. If these patterns touch

other metallic materials, electrical shorting will occur, causing the circuit to be

damaged or burnt.

• It is sometimes necessary to turn the DL1720E/DL1740E/DL1740EL upside

down for adjustment. Do not drop the instrument, or allow it to fall over.

• When feeding power with the DL1720E/DL1740E/DL1740EL cover open, apply

a flow of air to the AD4 board (or the AD2 board for the DL1720E) and Power

Supply (B8052YA*).

Power Supply of the DL1720E/DL1740E/DL1740EL shipped before May 2005 is
B9989YA, and Power Supply of the DL1720E/DL1740E/DL1740EL shipped since May
2005 is B8052YA.

Содержание DL1720E

Страница 1: ...Service Manual Yokogawa Electric Corporation DL1720E DL1740E DL1740EL Digital Oscilloscope SM 701730 01E 2nd Edition...

Страница 2: ...rs such as clerical errors or omissions YOKOGAWA assumes no responsibility of any kind concerning the accuracy or contents of this service manual nor for the consequences of any errors All rights rese...

Страница 3: ...ion by using an extension cord without protective grounding Connect the Protective Grounding Terminal The protective grounding terminal must be connected to ground to prevent an electric shock before...

Страница 4: ...dentify those instructions In the manual the symbol is used in conjunction with the word WARNING or CAUTION This symbol represents a functional grounding terminal Such terminals should not be used as...

Страница 5: ...onsiderations 2 Performance Testing Describes the tests for checking performance of the instrument 3 Adjustments Describes the adjustments which can be performed by users 4 Troubleshooting Describes p...

Страница 6: ...ccuracy Test 2 7 2 2 10 Input Signal Bandwidth 2 7 2 2 11 Trigger Sensitivity Test 2 8 2 2 12 Offset Accuracy 2 8 2 2 13 DC Accuracy 2 9 2 2 14 EXT Trigger Level Accuracy Test 2 10 2 2 15 EXT Trigger...

Страница 7: ...rinter Unit 7 6 7 7 Removing the Inverter Assy 7 9 7 8 Removing the Front Bezel 7 10 7 9 Removing the PC Card Drive FDD Assy 7 11 7 10 Removing the Key Board Assy 7 12 7 11 Removing the LCD 7 13 7 12...

Страница 8: ...er settings At the A D converter the received voltage level is converted into digital values The digital data is written to the primary memory by the primary data processing circuit at the sample rate...

Страница 9: ...gure 1 3 the vertical sensitivity from 10 V div to 2 mV div is achieved by switching the gain on the attenuator and the one chip amplifier IC The analog multiplexer IC is used to achieve the interleav...

Страница 10: ...n of the analog board assembly and the AD board assembly There are also EXT CLOCK IN EXT TRIG IN and TRIG GATE IN functions as well as an active probe power supply P4 or P2 for the DL1720E circuit ACQ...

Страница 11: ...character memory and displays them on the TFT color LCD The GCP also controls the built in printer Key Board Assembly Key switches LEDs the rotary encoder and the jog shuttle are installed on the key...

Страница 12: ...has an Ethernet controller These interfaces are controlled by the CPU and CPU I O interface CIO that are on the CPU board assembly OPT TRIG Board Assembly Optional The OPT TRIG board assembly is equip...

Страница 13: ...er RBC The RBC is a Bi CMOS gate array It performs primary processing of the data such as the extraction of the sampled data envelope and box averaging It also provides functions for controlling the r...

Страница 14: ...rd Assembly Control Signal AFC FTL TVC PWD Time Base ATT One Chip Amplifier Coupling AC DC Coupling 1 M 50 Multiplexer TV Trigger Comparator TRIG OUT To ACQ2 Board Assembly PROBE POWER 2 P2 From Power...

Страница 15: ...bly Ether Board Assembly GPIB Ethernet C10 USB Video OUT LCD FD Drive J1 Key Board Assembly Printer B5 PC CARD IF FDD Controller CIO GCP USB IF ETHERNET IF GPIB IF CPU Main Memory Flash ROM Backup RAM...

Страница 16: ...FC FTL TVC PWD Time Base ATT One Chip Amplifier Coupling AC DC Coupling 1 M 50 Multiplexer TV Trigger Comparator EXT CLOCK IN EXT TRIG IN TRIG GATE IN TRIG OUT To ACQ4 Board Assembly To ACQ4 Board Ass...

Страница 17: ...ideo OUT LCD FD Drive J1 Key Board Assembly Printer B5 PC CARD IF FDD Controller CIO GCP USB IF ETHERNET IF GPIB IF CPU Main Memory Flash ROM Backup RAM Graphic Memory Character Memory USB PERIPHERAL...

Страница 18: ...lease use the recommended equipment or their equivalents Test Environment Operating Conditions Ambient temperature 23 2 C Humidity 55 10 RH Voltage of power supply Specified voltage 1 Frequency of pow...

Страница 19: ...d PC Card IF Test Only When the J3 Option Is Installed Self Calibration Test 2 2 5 GP IB Test 2 2 6 Rear Panel Probe Power Supply Test 2 2 7 LINE Trigger Trigger LED and Hold Off Test 2 2 8 Probe Comp...

Страница 20: ...gs on the main unit during testing The DL1740E and DL1740EL accept 4 channel input so testing should be performed on channels 1 through 4 However the DL1720E has 2 channel input so testing should be p...

Страница 21: ...thstanding Voltage Tester G L N DL1720E DL1740E DL1740EL Items to Be Checked That the product specification is met Specification AC 1 5 kV for 1 minute 2 2 4 Selftest The selftest is performed in the...

Страница 22: ...x or Terminator as required 8 Execute a program like the one below The following program was written in Visual Basic Your program may differ depending on the language used Private Sub Command2_Click G...

Страница 23: ...owing settings SIMPLE Trigger Source Line Hold off 1 s Items to Be Checked That the trigger LED blinks at 1 second intervals 2 2 8 Probe Compensation Output and Auto Setup Test Testing Procedure 1 Con...

Страница 24: ...400 MHz 3dB 1 M probe terminal Testing Procedure 1 Execute calibration see section 4 6 Performing Calibration in the DL1720E DL1740E DL1740EL user s manual IM 701730 01E 2 Enter the following setting...

Страница 25: ...test so that the amplitude on the display screen is 500 mVP P Items to Be Checked Confirm that the triggers activate normally on all channels Trigger Sensitivity Test Waveform 2 2 12 Offset Accuracy...

Страница 26: ...from the DC voltage generator to the channel under test 4 Using the table below confirm that the measured values lie within the judgment criteria on all channels Range Input Measured Value Input Measu...

Страница 27: ...he EXT trigger input terminal on the rear panel Pass the input to the EXT trigger input terminal on the rear panel through a 50 terminator 3 Confirm that the value Vh read by the cursor when the polar...

Страница 28: ...Format Dual ACQ Record Length 10 k Mode Normal TIME DIV 10 ns div SIMPLE Trigger Source Ext Range 1 V for the DL1720E Probe 1 1 Level Vc see prev item Position 10 2 Input a 100 MHz 100 mVP P sinewave...

Страница 29: ...ngth 10 k Mode Normal Time Base Ext ENHANCED Trigger Type OR Set Pattern all channels Level all channels 0 mV 3 Input a 20 MHz sinewave to the EXT clock input terminal on the rear panel through a 50 t...

Страница 30: ...rns of the printed circuit board are exposed If these patterns touch other metallic materials electrical shorting will occur causing the circuit to be damaged or burnt It is sometimes necessary to tur...

Страница 31: ...supply Specified voltage 1 Frequency of power supply Specified frequency 1 Warm Up Time More than thrity minutes after tuning ON the instrument Confirm that self calibration is correctly executed aft...

Страница 32: ...utput Level 1 V FLUKE WAVETEK 9520 Accuracy 0 02 Square Wave Frequency 10 kHz Output Level 60 VP P Note The values shown in the specification column are those indicated by this service manual only The...

Страница 33: ...calibrator as follows DL1720E DL1740E DL1740EL VERTICAL for all channels V div 2 mV div Probe 1 1 Offset 1 000 V Bandwidth 20 MHz HORIZONTAL T div 1 ms div ACQ Mode Box Average DISPLAY Format Single...

Страница 34: ...3 5 SM 701730 01E Adjustments 3 R728 R721 R714 R707 Figure 3 2 Adjustment Point Location Diagram 3 4 DC Offset Adjustment on the AD Board...

Страница 35: ...3 6 SM 701730 01E Figure 3 3 Observed Waveform 3 4 DC Offset Adjustment on the AD Board...

Страница 36: ...ize soft key to execute initialization 5 Press the MISC key and select the Calibration soft key 6 Select the Cal Exec soft key to perform calibration 7 For adjustment of the 10 range enter the setting...

Страница 37: ...es flat as shown in figure 3 6 Observed Waveform The waveform must fit within 0 1 div 11 For adjustment of the 200 range enter the settings on the DL1720E DL1740E DL1740EL oscilloscope and calibrator...

Страница 38: ...Adjustments 3 CV103 CH1 CH3 CV203 CH2 CH4 CV102 CH1 CH3 CV101 CH1 CH3 CV201 CH2 CH4 CV202 CH2 CH4 Figure 3 5 Adjustment Point Location Diagram Figure 3 6 Observed Waveform 3 5 Flatness Adjustment on...

Страница 39: ...d 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 electri...

Страница 40: ...Replace power supply unit 1 Check each board for shorts 2 Check error contents Replace CPU board ass y Check LCD backlight Monitor display OK Backlight lights up Replace LCD ass y Replace lamp unit or...

Страница 41: ...730 B8052ME ACQ4L Board Assembly MODEL 701740 B8052MP Mother Board Assembly B9989MK KEY Board Assembly B8051MG OPT TRIG Board Assembly Option F5 A1092UN FDD Unit Model J1 B8050MK PCMCIA Board Assembly...

Страница 42: ...DL1740E DL1740EL shipped before May 2005 is B9989YA and Power Supply of the DL1720E DL1740E DL1740EL shipped since May 2005 is B8052YA 3 When trouble occurs check the test item displaying FAIL and sel...

Страница 43: ...requency B9989ML ANALOG Board Assembly MODEL 701715 701730 701740 Response Test B8052MH AD2 Board Assembly MODEL 701715 B8052MB AD4 Board Assembly MODEL 701730 701740 2 7Time base B9989ML ANALOG Board...

Страница 44: ...5 16 17 18 19 20 27 28 29 30 21 22 23 24 25 26 Figuer 4 2 Power Supply Secondary Terminals Table 4 5 Power Supply Secondary Terminal s Name Pin No Name 1 Sense 2 4 24 V 5 Remote 6 AC 5 V 8 12 V 10 5 2...

Страница 45: ...N15 CN16 CN11 CN12 CN13 CN14 B9989YD PROBE POWER Option P4 P2 P4 B8052SE 4 P2 B8052SE 2 CH1 CH2 CH3 NON CH4 EXT GND COMP B8052MS ETHER BOARD ASSY Option C10 CN1 B9969SC CN100 B9989SD SW CN302 CN301 CN...

Страница 46: ...mer Maintenance Parts List 6 Chapter 6 Customer Maintenance Parts List 6 1 Customer Maintenance Parts List CH2 CH3 CH4 CH1 1M 20pF 5Vrms 10Vpk 50 400Vpk CAT Note Parts marked with a symbol are Custome...

Страница 47: ...9989DA Top Cover 1 Y9408LB B H Screw M4x8 B H Screw M4x8 4 Y9408LB 2 B9989EC Support 1 B9989EU Sheet 1 B9989DT Printer Cover 1 B9989DU Handle 1 B9946BQ Sheet B5 1 B9858GB Clamp 1 3 4 5 6 7 8 9 10 B998...

Страница 48: ...01730 01E Customer Maintenance Parts List 6 Main Assembly 1 2 3 4 5 6 7 8 9 10 13 12 11 14 15 16 17 18 19 20 21 22 23 24 25 26 38 39 27 28 41 40 29 30 32 31 33 34 35 36 37 6 1 Customer Maintenance Par...

Страница 49: ...1 B9989DQ Knob 1 22 B9989DG Knob 701715 1 23 24 B9989DH Knob 701730 701740 I O Device B5 Screw B5 1 A1207UD 3 Y9205LB 1 25 A1161UN Memory System J1 1 26 B8050WD SUMI Card J1 CPU Floppy 1 27 28 B9989SA...

Страница 50: ...6 7 8 9 10 11 12 13 14 15 1 Power Supply Code 3P 2P Adapter select Power Supply Code Suffix code D UL CSA standard Power Supply Code Suffix code F VDE standard Power Supply Code Suffix code Q BS stan...

Страница 51: ...Assy Printer Unit Front Bezel Inverter Assy PC Card Drive FDD Assy Key Board Assy LCD Power Supply Assy Input Assy AD Board Assy Analog Assy ET2 Assy ACQ Board Assy Section 7 3 Section 7 4 Section 7 5...

Страница 52: ...as shown 2 Remove the four screws from the bottom of the instrument as shown 3 The top cover fits into the back of the front bezel Remove the top cover by slowly pulling it away from the front bezel...

Страница 53: ...an Assy 1 Remove the top cover See section 7 2 Removing the Top Cover 2 Remove the cables on the right side panel as you face the instrument as shown in the figure below 3 Remove the three screws from...

Страница 54: ...rinter cover by raising it in the direction of the arrow as shown below then forcing it back until it pops out 3 Remove the screw from the printer case located toward the rear of the instrument 4 Lift...

Страница 55: ...crew from the left side panel as shown in the figure 3 Remove the screw from the right side panel as shown then remove the multiconductor s there are two multiconductors with a PC card and one with a...

Страница 56: ...inter Case 2 Remove the two screws from the left side panel as shown in the figure below Next remove the handle and bracket in the direction of the arrow DL with the Handle and Bracket Removed 3 Remov...

Страница 57: ...hen remove the cover in the direction of the arrow 5 Remove the cable in the direction of the arrow shown in the figure below 6 Remove the screws from the left side panel as shown in the figure below...

Страница 58: ...gure below then lift up the I O device in the direction of the white arrow DL with the I O Device Removed 9 Disconnect the three cable connectors as shown in the figure below then remove the cables DL...

Страница 59: ...Disassembly 7 7 7 7 Removing the Inverter Assy 1 Remove the printer unit See section 7 6 Removing the Printer Unit 2 Remove the two screws as shown disconnect the three cables then remove the assy DL...

Страница 60: ...n the figure below and remove them 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 Therefore you should repl...

Страница 61: ...Assy 1 Remove the front bezel See section 7 8 Removing the Front Bezel 2 Remove the multiconductor s there are two multiconductors with a PC card drive and one with a floppy disk drive then remove th...

Страница 62: ...ing the Key Board Assy 1 Remove the front bezel See section 7 8 Removing the Front Bezel 2 Remove the five screws as shown in the figure below 3 Remove the multiconductor as shown in the figure DL wit...

Страница 63: ...nt bezel See section 7 6 Removing the Printer Unit and section 7 8 Removing the Front Bezel 2 Remove the two cables then remove the multiconductor as shown in the figure below 3 Remove the four screws...

Страница 64: ...ng the Fan Assy and section 7 8 Removing the Front Bezel 2 Remove the two screws then remove the bracket as shown in the figure below 3 Remove the three screws as shown in the figure below 4 Remove th...

Страница 65: ...7 15 SM 701730 01E Procedures for Disassembly 7 7 DL with the Power Supply Assy Removed 7 12 Removing the Power Supply Assy...

Страница 66: ...the Fan Assy and section 7 8 Removing the Front Bezel 2 Remove the two screws as shown in the figure below 3 Remove the five screws as shown in the figure below 4 Remove the two screws then remove th...

Страница 67: ...ld plate as shown in the figure below 7 Remove the right shield plate as shown in the figure below 8 Remove the cable as shown in the figure below 9 Lift up the front end of the board assy as shown in...

Страница 68: ...7 18 SM 701730 01E DL with the Input Assy Removed 7 13 Removing the Input Assy...

Страница 69: ...the ACQ Board Assy See section 7 16 Removing the ACQ Board Assy 2 Remove the four screws as shown in the figure below then remove the nuts as shown in the figure below 3 As shown in the figure below r...

Страница 70: ...7 20 SM 701730 01E DL with the AD Board Assy Removed 7 14 Removing the AD Board Assy...

Страница 71: ...2 Assy 1 Remove the input assy See section 7 13 Removing the Input Assy 2 Remove the two screws then remove the cover as shown in the figure below 3 Remove the screw as shown in the figure below 4 Rem...

Страница 72: ...moving the ACQ Board Assy 1 Remove the input assy See section 7 13 Removing the Input Assy 2 Remove the screw as shown in the figure below 3 Remove the six screws as shown in the figure below DL with...

Страница 73: ...dures for Disassembly 7 7 7 17 Removing the Ether Board Assy 1 Remove the CPU board assy See section 7 5 Removing the CPU board Assy 2 Remove the three screws as shown in the figure below DL with the...

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