YOKOGAWA DL1720E Service Manual Download Page 43

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4-5

SM 701730-01E

Troubleshooting

(4)

When trouble occurs, check the non-conforming test and select the relevant defective

assembly from table 4.4, “Correspondence of Test Items to Defective Assemblies.” If

necessary, replace the relevant assembly.

Table 4.4 Correspondence of Test Item to Defective Assemblies

Test Item

Assembly No. Assembly

2.5Vertical Axis DC

B9989ML

ANALOG Board Assembly (MODEL: 701715/701730/701740)

Voltage Accuracy B8052MH

AD2 Board Assembly (MODEL: 701715)

Test

B8052MB

AD4 Board Assembly (MODEL: 701730/701740)

2.6Frequency

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 Assembly (MODEL: 701715/701730/701740)

Accuracy Test

B8052MH

AD2 Board Assembly (MODEL: 701715)

B8052MB

AD4 Board Assembly (MODEL: 701730/701740)

2.8Trigger Sensitivity B9989ML

ANALOG Board Assembly (MODEL: 701715/701730/701740)

Test

B8052MH

AD2 Board Assembly (MODEL: 701715)

B8052MB

AD4 Board Assembly (MODEL: 701730/701740)

2.9Trigger Accutracy B9989ML

ANALOG Board Assembly (MODEL: 701715/701730/701740)

Test

B8052MH

AD2 Board Assembly (MODEL: 701715)

B8052MB

AD4 Board Assembly (MODEL: 701730/701740)

4.3 Assemblies to Check When an Error Occurs

Summary of Contents for DL1720E

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

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

Page 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...

Page 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...

Page 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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