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Fluke 199B Service Manual

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Fluke 19xB-19xC-2x5C
ScopeMeter
models 192B,196B,199B,192C,196C,199C,215C,225C

Service Manual

PN 4822 872 05391
September 2002, rev.2, Oct.09
© 2002-2009 Fluke Corporation, All rights reserved.
All product names are trademarks of their respective companies.

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  Summary of Contents for Fluke 199B

  • Page 1: Service Manual

    Fluke 19xB-19xC-2x5C ScopeMeter models 192B,196B,199B,192C,196C,199C,215C,225C Service Manual PN 4822 872 05391 September 2002, rev.2, Oct.09 © 2002-2009 Fluke Corporation, All rights reserved. All product names are trademarks of their respective companies.
  • Page 2 PLACING ORDERS AND GETTING ASSISTANCE To locate an authorized service center, visit us on the World Wide Web: http://www.fluke.com or call Fluke using any of the phone numbers listed below: +1-888-993-5853 in U.S.A. and Canada +31-40-2675200 in Europe +1-425-446-5500 from other countries...
  • Page 3: Table Of Contents

    Table of Contents Chapter Title Page Safety Instructions................1-1 1.1 Introduction....................1-3 1.2 Safety Precautions..................1-3 1.3 Caution and Warning Statements..............1-3 1.4 Symbols .......................1-3 1.5 Impaired Safety....................1-4 1.6 General Safety Information................1-4 Characteristics ..................2-1 List of Replaceable Parts ..............3-1 3.1 Introduction....................3-3 3.2 How to Obtain Parts..................3-3 3.3 Final Assembly Parts ...................3-4 3.4 Main PCA Unit Parts ...................3-6...
  • Page 4 Fluke 19xB-19xC-2x5C Service Manual 4.6.14 Video test using SC600 Scope Calibration Option ......4-24 4.7 External Trigger Level Test .................4-27 4.8 Meter (DMM) Tests..................4-28 4.8.1 Meter DC Voltage Accuracy Test ............4-28 4.8.2 Meter AC Voltage Accuracy & Frequency Response Test ....4-29 4.8.3 Continuity Function Test..............4-30...
  • Page 5 List of Tables Table Title Page 3-1.Final Assembly Parts ...................3-4 3-2.Main PCA Unit Parts...................3-6 3-3.Standard Accessories...................3-8 3-5.Optional Accessories ...................3-9 4-1.Vertical Accuracy Verification Points............4-8 4-2. Volts DC Measurement Verification Points ..........4-10 4-4.Input A&B AC Input Coupling Verification Points ........4-13 4-5.Volts Peak Measurement Verification Points..........4-14 4-6.Input A&B Frequency Measurement Accuracy Test ........4-15 4-7.Phase Measurement Verification Points............4-16 4-8.Input A Trigger Sensitivity Test Points............4-18...
  • Page 6 Fluke 19xB-19xC-2x5C Service Manual...
  • Page 7 List of Figures Figure Title Page 3-1.Final Assembly Details................3-5 3-2. Main PCA Unit...................3-7 3-3.Rubber Spacer on Shielding Box Assy............3-7 4-1.Menu item selection..................4-4 4-2. Display Test Pattern ...................4-6 4-3.Test Tool Input A&B to 5500 Normal Output ..........4-7 4-4.5500 Scope Output to Test Tool Input A&B..........4-14 4-5.5500A Scope Output to Test Tool Input A..........4-16 4-7.5500A Scope Output to Test Tool Input B..........4-20 4-8.Test Tool Input A to TV Signal Generator..........4-22...
  • Page 9: Title

    Chapter 1 Safety Instructions Title Page 1.1 Introduction....................1-3 1.2 Safety Precautions..................1-3 1.3 Caution and Warning Statements..............1-3 1.4 Symbols ....................... 1-3 1.5 Impaired Safety.................... 1-4 1.6 General Safety Information................1-4...
  • Page 11: Introduction

    See explanation in Users Manual DOUBLE INSULATION (Protection Class) Live voltage Earth Ground Static sensitive components Recycling information (black/yellow). Do not dispose of this product Conformité Européenne as unsorted municipal waste. Go to Fluke's website for recycling information. Safety Approval Safety Approval...
  • Page 12: Impaired Safety

    Fluke 19xB-19xC-2x5C Service Manual 1.5 Impaired Safety Whenever it is likely that safety has been impaired, the test tool must be turned off and disconnected from line power. The matter should then be referred to qualified technicians. Safety is likely to be impaired if, for example, the test tool fails to perform the intended measurements or shows visible damage.
  • Page 13: Characteristics

    Chapter 2 Characteristics For the specifications please refer to the ScopeMeter test tool Users Manual Chapter “Specifications”.
  • Page 15: List Of Replaceable Parts

    Chapter 3 List of Replaceable Parts Title Page 3.1 Introduction....................3-3 3.2 How to Obtain Parts..................3-3 3.3 Final Assembly Parts ...................3-4 3.4 Main PCA Unit Parts ...................3-6 3.5 Accessories ....................3-8...
  • Page 17: Introduction

    To ensure prompt delivery of the correct part, include the following information when you place an order: • Instrument model (for example Fluke-196C), 12 digit instrument code (9444 ..), and serial number (DM..). The items are printed on the type plate on the bottom cover.
  • Page 18: Final Assembly Parts

    Input cover (including screws) 1285765 EJOT Pt screw 1284966 Main PCA unit; The Main PCA is only available to Fluke Service Centers due to the programming that is necessary after installation. Hang strap 1286041 Bottom case assembly (see note 2 below)
  • Page 19 List of Replaceable Parts 3.3 Final Assembly Parts (2x) (4x) (2x) (2x) ST8738 (2x) (2x) st8738.wmf Figure 3-1. Final Assembly Details...
  • Page 20: Main Pca Unit Parts

    Fluke 19xB-19xC-2x5C Service Manual 3.4 Main PCA Unit Parts See Table 3-2 and Figure 3-2 for the main PCA Unit parts. Table 3-2. Main PCA Unit Parts Item Description Ordering Code Shielding box assy (includes rubber spacer, see fig. 8-5)
  • Page 21 List of Replaceable Parts 3.4 Main PCA Unit Parts ST8676.wmf Figure 3-2. Main PCA Unit rubber-spacer-16gray.jpg Figure 3-3. Rubber Spacer on Shielding Box Assy...
  • Page 22: Accessories

    National Standards. The 230V rating of the BC190/808 is not for use in North America. Voltage Probe Set (Red), designed for use with the Fluke ScopeMeter 190 series VP210-R test tool.
  • Page 23: Accessories

    FlukeView™ ScopeMeter Software for Windows® SW90W Optically Isolated RS-232 Adapter/Cable PM9080 Optically Isolated USB Cable OC4USB Hard Case C190 Soft Case C195 Current Shunt 4-20 mA CS20MA Print Adapter Cable for Parallel Printers PAC91 Bus Health Test Adapter (for Fluke 215C-225C) BHT190...
  • Page 24 Fluke 19xB-19xC-2x5C Service Manual 3-10...
  • Page 25: Performance Verification

    Chapter 4 Performance Verification Title Page 4.1 Introduction....................4-3 4.2 Equipment Required For Verification ............4-3 4.3 General Instructions ..................4-3 4.4 Operating Instructions.................. 4-4 4.4.1 Resetting the test tool ................4-4 4.4.2 Navigating through menu’s ..............4-4 4.4.3 Creating Test Tool Setup1..............4-5 4.5 Display and Backlight Test................
  • Page 26 Fluke 19xB-19xC-2x5C Service Manual...
  • Page 27: Introduction

    4.2 Equipment Required For Verification The primary source instrument used in the verification procedures is the Fluke 5500A. If a 5500A is not available, you can substitute another calibrator as long as it meets the minimum test requirements.
  • Page 28: Operating Instructions

    Fluke 19xB-19xC-2x5C Service Manual 4.4 Operating Instructions 4.4.1 Resetting the test tool Proceed as follows to reset the test tool: • Press to turn the test tool off. • Press and hold • Press and release to turn the test tool on.
  • Page 29: Creating Test Tool Setup1

    Performance Verification 4.5 Display and Backlight Test 4.4.3 Creating Test Tool Setup1 Before starting the verification procedure you must define a standard test tool setup, called SETUP 1. During verification you will be asked to recall this setup. This defines the initial test tool setup for each verification.
  • Page 30 Fluke 19xB-19xC-2x5C Service Manual The test tool shows the calibration menu in the bottom of the display. • Do not press now! If you did, turn the test tool off and on, and start at 4. • Pressing will toggle the menu on-off.
  • Page 31: Scope Input A&B Tests

    Performance Verification 4.6 Scope Input A&B Tests 4.6 Scope Input A&B Tests 4.6.1 Input A&B Vertical Accuracy Test WARNING Dangerous voltages will be present on the calibration source and connecting cables during the following steps. Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool.
  • Page 32: Vertical Accuracy Verification Points

    Fluke 19xB-19xC-2x5C Service Manual 4. Using move the Input A ground level (indicated by the zero icon the left margin) to the center grid line. 5. Using move the Input B ground level (indicated by the zero icon the left margin) to the grid line one division below the center grid line.
  • Page 33: Input A&B Dc Voltage Accuracy Test

    Note The vertical accuracy test can also be done with dc voltage. This method is advised for automatic verification using the Fluke Met/Cal Metrology Software. For each sensitivity range you must proceed as follows: 1. Apply a +3 divisions voltage, and adjust the voltage until the trace is at +3 divisions.
  • Page 34: Volts Dc Measurement Verification Points

    Fluke 19xB-19xC-2x5C Service Manual Table 4-2. Volts DC Measurement Verification Points Range 5500A output V dc Input A&B Reading 2 mV/div +6.0 mV +4.9 to +7.1 -6.0 mV -4.9 to -7.1 5 mV/div +15.0 mV +14.3 to +15.7 -15.0 mV -14.3 to -15.7...
  • Page 35: Input A&B Ac Voltage Accuracy Test (Lf)

    Performance Verification 4.6 Scope Input A&B Tests 4.6.3 Input A&B AC Voltage Accuracy Test (LF) This procedure tests the Volts ac accuracy with dc coupled inputs up to 50 kHz. The high frequencies are tested in sections 4.6.10 and 4.6.12. Warning Dangerous voltages will be present on the calibration source and connecting cables during the following steps.
  • Page 36: Input A & B Ac Coupled Lower Frequency Test

    Fluke 19xB-19xC-2x5C Service Manual Table 4-3. Volts AC Measurement Verification Points Range 5500A output Input A&B Reading V ac Frequency 2 mV/div (Select 10 ms/div) 4 mV 60 Hz 3.0 mV to 5.0 mV Set input A&B Bandwidth 10 kHz to prevent OL due to calibrator noise: see step 2.
  • Page 37: Input A And B Peak Measurements Test

    Performance Verification 4.6 Scope Input A&B Tests • Press to clear the softkey menu, and to see the full screen. 3. Using change the time base to select manual time base ranging, and lock the time base on 50 ms/div. 4.
  • Page 38: Input A&B Frequency Measurement Accuracy Test

    Fluke 19xB-19xC-2x5C Service Manual 4. Using move the Input A and B ground level (indicated by the zero icon in the left margin) to the center grid line. 5. Using select manual vertical ranging, and set the Input A and B sensitivity range to 100 mV.
  • Page 39: Input A&B Phase Measurements Test

    Performance Verification 4.6 Scope Input A&B Tests • Press , and select READING 1 on A | • Press , and select READING 2 on B | 3. Using select range 100 mV/div for A and B. 4. Using select the required time base setting. 5.
  • Page 40: Time Base Test

    Fluke 19xB-19xC-2x5C Service Manual 6. Observe the reading and check to see if they are not outside the range shown under the appropriate column. 7. Continue through the test points. 8. When you are finished, set the 5500A to 0 (zero) Volt, and to Standby.
  • Page 41: Input A Trigger Sensitivity Test

    Performance Verification 4.6 Scope Input A&B Tests the center of the display bottom. Adjust the trigger delay time to 8.000 ms ( →| 8.00 ms • set the time base on 10 μs/div. Using 4. Using move the trace to the right until the indicated trigger delay is 7.990 ms.
  • Page 42: Input A Trigger Sensitivity Test Points

    Fluke 19xB-19xC-2x5C Service Manual • Using change the sensitivity range to select manual sensitivity ranging, and lock the Input A sensitivity range on 2 V/div. 3. Using select the time base indicated under the second column of Table 4-8. 4. Set the 5500A to source the leveled sine wave for the appropriate test tool model.
  • Page 43: Input A Ac Voltage Accuracy (Hf) & Bandwidth Test

    Performance Verification 4.6 Scope Input A&B Tests 4.6.10 Input A AC Voltage Accuracy (HF) & Bandwidth Test Proceed as follows to test the Input A high frequency automatic scope ac voltage measurement accuracy, and the bandwidth: 1. Connect the test tool to the 5500A as for the previous test (see Figure 4-5). 2.
  • Page 44: Input B Trigger Sensitivity Test

    Fluke 19xB-19xC-2x5C Service Manual 4.6.11 Input B Trigger Sensitivity Test Proceed as follows to test the Input B trigger sensitivity: 1. Connect the test tool to the 5500A as shown in Figure 4-7. al55scb.bmp Figure 4-7. 5500A Scope Output to Test Tool Input B 2.
  • Page 45: Input B Ac Voltage Accuracy (Hf) & Bandwidth Test

    Performance Verification 4.6 Scope Input A&B Tests Table 4-10. Input B Trigger Sensitivity Test Points 5500A SC... MODE levsin Model Time base Initial Input Voltage Frequency Trigger Amplitude 200 ns/div 100 mV pp 5 MHz 0.5 div 192B-C 10 ns/div 400 mV pp 60 MHz 1 div...
  • Page 46: Video Test Using The Video Pattern Generator

    Fluke 19xB-19xC-2x5C Service Manual 4.6.13 Video test using the Video Pattern Generator You can skip this test if you do the test 4.6.14 Video test using the SC600 Scope Calibration option Only one of the systems NTSC, PAL, PALplus, or SECAM has to be verified.
  • Page 47 Figure 4-12. Trace for NTSC line 262 7. Apply the inverted TV Signal Generator signal to the test tool. Invert the signal by using a Banana Plug to BNC adapter (Fluke PM9081/001) and a Banana Jack to BNC adapter (Fluke PM9082/001), as shown in Figure 4-13.
  • Page 48: Video Test Using Sc600 Scope Calibration Option

    Fluke 19xB-19xC-2x5C Service Manual al-tv-ai.bmp Figure 4-13. Test Tool Input A to TV Signal Generator Inverted 8. Select the following test tool setup: • Press to open the Trigger Options menu. • Choose , then from the shown opened menu choose VIDEO on A...
  • Page 49 Performance Verification 4.6 Scope Input A&B Tests Proceed as follows: 1. Connect the test tool to the calibrator as shown in Figure 4-16. al55sca.bmp Figure 4-16. Test Tool Input A to TV Signal Generator 2. Select the following test tool setup: •...
  • Page 50 Fluke 19xB-19xC-2x5C Service Manual 5. Using select test tool line number: ⇒ 310 for PAL, PALplus or SECAM ⇒ 262 for NTSC 6. Set the calibrator format and marker line number to : ⇒ PAL 310 (odd), for PAL and PALplus ⇒...
  • Page 51: External Trigger Level Test

    Performance Verification 4.7 External Trigger Level Test 4.7 External Trigger Level Test Proceed as follows: 1. Connect the test tool to the 5500A as shown in Figure 4-18. al55ex2w.bmp Figure 4-18. Test Tool Meter/Ext Input to 5500A Normal Output 2. Select the following test tool setup: •...
  • Page 52: Meter (Dmm) Tests

    Fluke 19xB-19xC-2x5C Service Manual 4.8 Meter (DMM) Tests 4.8.1 Meter DC Voltage Accuracy Test WARNING Dangerous voltages will be present on the calibration source and connecting cables during the following steps. Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool.
  • Page 53: Meter Ac Voltage Accuracy & Frequency Response Test

    Performance Verification 4.8 Meter (DMM) Tests 4.8.2 Meter AC Voltage Accuracy & Frequency Response Test Warning Dangerous voltages will be present on the calibration source and connecting cables during the following steps. Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool.
  • Page 54: Continuity Function Test

    Fluke 19xB-19xC-2x5C Service Manual 4.8.3 Continuity Function Test Proceed as follows: 1. Select the following test tool setup: • Press • Press to open the Measurement menu, and select Continuity 2. Connect the test tool to the 5500A as for the previous test (see Figure 4-18).
  • Page 55: Resistance Measurement Verification Points

    Performance Verification 4.8 Meter (DMM) Tests al55ex4w.bmp Figure 4-19. Test Meter Tool Input to 5500A Normal Output 4-Wire 2. Select the following test tool setup: • Press • Press to open the Measurement menu, and select Ohms • Press to select AUTO ranging. 3.
  • Page 56: Probe Calibration Generator Test

    Fluke 19xB-19xC-2x5C Service Manual 4.9 Probe Calibration Generator Test To verify the internal probe calibration square wave generator, you can do a Probe Calibration as described in section 5.8. If no square wave appears on the screen, either • the probe is defective: try another probe, check the probe with an external voltage in a scope application, •...
  • Page 57: Calibration Adjustment

    Chapter 5 Calibration Adjustment Title Page 5.1 General......................5-3 5.1.1 Introduction ..................5-3 5.1.2 Calibration number and date..............5-3 5.1.3 General Instructions................5-3 5.1.4 Equipment Required For Calibration ........... 5-3 5.2 Calibration Procedure Steps................. 5-4 5.3 Starting the Calibration ................5-4 5.4 Contrast Calibration Adjustment ..............
  • Page 59: General

    Power the test tool via the BC190 Battery Charger/Power Adapter 5.1.4 Equipment Required For Calibration The primary source instrument used in the calibration procedures is the Fluke 5500A. If a 5500A is not available, you can substitute another calibrator as long as it meets the...
  • Page 60: Calibration Procedure Steps

    Calibration Option. • Stackable Test Leads (4x), supplied with the 5500A. • 50Ω Coax Cable (2x), for example Fluke PM9091 (1.5m) or PM9092 (0.5m). • 50Ω feed through termination, Fluke PM9585. • Male BNC to Dual Female BNC Adapter (1x), Fluke PM9093/001.
  • Page 61 Calibration Adjustment 5.3 Starting the Calibration To enter the calibration mode proceed as follows: • Press and hold , press and release , release The display shows the (Calibration Adjustment) screen. CAL MODE The display shows the calibration step , the calibration status Warming Up (CL 0200) , and the softkey menu.
  • Page 62: Contrast Calibration Adjustment

    Fluke 19xB-19xC-2x5C Service Manual 5.4 Contrast Calibration Adjustment After entering the calibration mode the display shows: WarmingUp (CL 0200):IDLE (valid) Do not press now! If you did, turn the test tool off and on, and enter the calibration mode again.
  • Page 63: Warming Up & Pre-Calibration

    Calibration Adjustment 5.5 Warming Up & Pre-Calibration 5.5 Warming Up & Pre-Calibration The WarmingUp & Pre-Calibration state will be entered after entering the calibration mode (section 5.3), or after selecting the next step if you have done the Contrast Calibration step CL 120 (section 5.4). The display will show WarmingUp (CL 0200):IDLE (valid) or (invalid).
  • Page 64: Final Calibration

    Fluke 19xB-19xC-2x5C Service Manual 5.6 Final Calibration Before starting the final calibration you must have done the WarmingUp & PreCalibration (section 5.5)! The final calibration requires input conditions that will be described in each step. After starting a step, several steps that require the same input conditions will be done automatically.
  • Page 65: Input B Lf-Hf Gain

    0.5 Vpp sine wave, 50 kHz SCOPE levsine, 0.5 Vpp, 50 kHz CL 0481 0.5 Vpp sine wave SCOPE levsine, 0.5 Vpp, Fluke 199B-C, 225C: 221 MHz 221 MHz Fluke 196B-C, 215C: 141 MHz 141 MHz Fluke 192B-C: 91 MHz 91 MHz 5.6.2 Input B LF-HF Gain...
  • Page 66: Input B Lf-Hf Gain Calibration Points

    0.5 Vpp sine wave, 50 kHz SCOPE levsine, 0.5 Vpp, 50 kHz CL 0483 0.5 Vpp sine wave SCOPE levsine, 0.5 Vpp, Fluke 199B-C, 225C: 221 MHz 221 MHz Fluke 196B-C, 215C: 141 MHz 141 MHz Fluke 192B-C: 91 MHz...
  • Page 67: Input A&B Lf-Hf Gain

    Calibration Adjustment 5.6 Final Calibration 5.6.3 Input A&B LF-HF Gain Proceed as follows to do the Input A&B LF-HF Gain calibration. 1. Press to select the first calibration step in Table 5-3. 2. Connect the test tool to the 5500A as shown in Figure 5-5. alscab.bmp Figure 5-5.
  • Page 68: Input A&B Position

    Fluke 19xB-19xC-2x5C Service Manual Table 5-3. Input A&B Gain Calibration Points Cal step UUT input value (5500A SCOPE, MODE volt, SCOPE Z 1 MΩ, 1 kHz) CL 0660 300 mV CL 0604 500 mV CL 0637 none (5500 standby) CL 0504...
  • Page 69: Input A&B Volt Gain

    Calibration Adjustment 5.6 Final Calibration 5.6.5 Input A&B Volt Gain Warning Dangerous voltages will be present on the calibration source and connection cables during the following steps. Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool. Proceed as follows to do the Input A&B Volt Gain calibration.
  • Page 70: Dmm Volt Gain

    Fluke 19xB-19xC-2x5C Service Manual Table 5-4. Input A&B Gain Calibration Points Cal step UUT input value (5500A NORMAL) CL 0824 250 mV CL 0799 5 mV Not for software versions V05.01 and V05.02 CL 0800 12.5 mV CL 0801 25 mV...
  • Page 71: Input A& B, And Dmm Zero

    Calibration Adjustment 5.6 Final Calibration al55ex2w.bmp Figure 5-7. 5500A NORMAL Output to Test Tool Banana Input 3. Set the 5500A to supply a DC voltage, to the first calibration point in Table 5-5. 4. Set the 5500A to operate (OPR). 5.
  • Page 72: Dmm Ohm Gain

    Fluke 19xB-19xC-2x5C Service Manual 3. Short circuit the banana jack Meter inputs properly (calibration includes Ohms zero!). 4. Press to start the zero calibration 5. Wait until the display shows the status :READY 6. Remove the input terminations. 7. Continue at Section 5.6.8.
  • Page 73: Calculate Gain

    Calibration Adjustment 5.6.9 Calculate Gain Table 5-6. Ohm Gain Calibration Points Cal Step UUT input Value (5500 NORMAL) 100 Ω CL 0910 CL 0911 1 kΩ CL 0912 10 kΩ CL 0913 100 kΩ CL 0914 1 MΩ CL 0915 10 MΩ...
  • Page 74 Fluke 19xB-19xC-2x5C Service Manual Possible error messages. The following messages can be shown on the test tool display: WARNING: Calibration data not valid. Save data and exit maintenance mode? Proceed as follows: • If you did the WarmingUp and Pre-Calibration successfully (section 5.5), and you want to store the Pre-Calibration data before continuing with the Final Calibration: ⇒...
  • Page 75: Probe Calibration

    Calibration Adjustment 5.8 Probe Calibration 5.8 Probe Calibration To meet full user specifications, you need to adjust the supplied red and gray VPS200 voltage probes for optimal response. To adjust the VPS200 probes, do the following: 1. Connect the red probe from the red Input A BNC to the banana jacks. See figure 5-9 ST7991.WMF ST8416.WMF Figure 5-9.
  • Page 76 Fluke 19xB-19xC-2x5C Service Manual 5-20...
  • Page 77: Disassembling The Test Tool

    Chapter 6 Disassembling the Test Tool Title Page 6.1. Introduction....................6-3 6.2. Disassembly & Reassembly Procedures ............. 6-3 6.2.1 Required Tools ..................6-3 6.2.2 Removing the Tilt Stand & Hang Strap..........6-3 6.2.3 Replacing the Side-Strap, Changing the Side-Strap Position....6-3 6.2.4 Opening the Test Tool, Removing the Battery........
  • Page 79: Introduction

    Disassembling the Test Tool 6.1. Introduction 6.1. Introduction This section provides the required disassembling procedures. The printed circuit assembly removed from the test tool must be adequately protected against damage. Warning To avoid electric shock, disconnect test leads, probes and power supply from any live source and from the test tool itself.
  • Page 80 Fluke 19xB-19xC-2x5C Service Manual 4. Unscrew the two screws that lock the bottom case. 5. Lift the bottom case at the lower side to remove it. 6. Lift out the battery pack (Figure 6-4). 7. Unplug the cable leading to the Main PCA (pull the cable gently backwards).
  • Page 81: Removing The Main Pca Unit And The Fan

    Disassembling the Test Tool 6.2. Disassembly & Reassembly Procedures (2x) (4x) (2x) (2x) ST8738 (2x) (2x) ST8738.WMF Figure 6-5. Final Assembly Details 6.2.5 Removing the Main PCA Unit and the Fan Caution To avoid contaminating the flex cable contacts with oil from your fingers, do not touch the contacts (or wear gloves).
  • Page 82: Removing The Display Assembly

    Fluke 19xB-19xC-2x5C Service Manual Referring to Figure 6-5, use the following procedure to remove the main PCA unit. 1. Open the test tool (see Section 6.2.4). 2. Disconnect the blue keypad foil (item 5) flat cable, and the white LCD (item 7) flex cable.
  • Page 83: Replacing The Lcd Window/Decal

    Disassembling the Test Tool 6.2. Disassembly & Reassembly Procedures 6.2.7 Replacing the LCD Window/Decal The LCD window/decal (Figure 6-5, item 2) is glued on the top cover. To replace it do the following: 1. From the inside of the top cover push the window outwards until it comes of. 2.
  • Page 84: Reassembling The Main Pca Unit

    Fluke 19xB-19xC-2x5C Service Manual 5. To get access to the input circuits on the PCA, unscrew the Torx screws item 7 and remove the metal input circuit shielding boxes. ST8676.WMF Figure 6-7. PCA Unit Assembly 6.2.10 Reassembling the Main PCA Unit Reassembling the main PCA unit is the reverse of disassembly (see figure 6.7).
  • Page 85: Reassembling The Test Tool

    Disassembling the Test Tool 6.2. Disassembly & Reassembly Procedures 6.2.11 Reassembling the Test Tool Reassembling the test tool is the reverse of disassembly. However you must follow special precautions when reassembling the test tool. Refer to figure 6-5. Reassembling procedure for a completely disassembled unit: 1.
  • Page 86 Fluke 19xB-19xC-2x5C Service Manual 6-10...

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