Turner Designs TD-20/20 Service Manual
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Turner Designs TD-20/20 Service Manual

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TD-20/20 LUMINOMETER SERVICE MANUAL
Section 1
Section 2
Section 3
I.
998-2021 Rev. 1.0
Rev. 1.0
CONTENTS
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Page 1

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Summary of Contents for Turner Designs TD-20/20

  • Page 1: Table Of Contents

    TD-20/20 LUMINOMETER SERVICE MANUAL Rev. 1.0 CONTENTS Page Section 1 INTRODUCTION Section 2 PRELIMINARY CHECKS Section 3 TROUBLESHOOTING GUIDE A. Shutter: Mechanical & Electronic B. Injector: Mechanical & Electronic C. Abort Run D. Low/High/Drifting Readings E. No Response (no change in LCD readings) F.

  • Page 2: Introduction

    TD-20/20 Luminometer Service Manual Section 1 INTRODUCTION This manual will help you troubleshoot and repair most of the common problems encountered with the TD- 20/20 Luminometer. The User's Manual that came with your instrument contains useful information about operational parameters, calibration, alarms, and diagnostics; please consult it if you have a problem at this level.

  • Page 3: Preliminary Checks

    TD-20/20 Luminometer Service Manual Section 2 PRELIMINARY CHECKS Troubleshooting should be performed in this sequence: Check for SOFTWARE problems; i.e., make sure operational parameters are correctly set; make sure sensitivity has been set properly and that level is adequate; check for correct standards, etc., if applicable.
  • Page 4 TD-20/20 Luminometer Service Manual Visually and manually check for loose connectors. The latches on the ribbon cable connectors are secured as a precaution with RTV, but they have been known to pop open. Visually and manually check to see that wires are seated in their connectors. The connectors are secured as a precaution with RTV, but wires have been known to slip out.

  • Page 5: Troubleshooting Guide

    TD-20/20 Luminometer Service Manual Section 3 TROUBLESHOOTING GUIDE SHUTTER - MECHANICAL Note that it is difficult to tell whether a shutter problem is mechanical or electronic, unless you can see or hear the shutter mechanism operating. Thus, if there is a shutter problem, you will probably need to check both.

  • Page 6: Injector: Mechanical & Electronic

    TD-20/20 Luminometer Service Manual INJECTOR - MECHANICAL Symptom Problem/Solution Injector cycles but does not pump fluid 1. Tubing fittings loose. Check for leaks; tighten connections. 2. Valves stuck shut or missing. Remove & inspect valves as described in Operating Manual.

  • Page 7: Abort Run

    TD-20/20 Luminometer Service Manual “ABORT” RUN Symptom: Instrument “aborts” run and Action: reads >9999; and shutter keeps Light leak somewhere. Check lid light clicking. Remove sample and seal; check injector(s) tubing, fittings, press <GO> key. Does it abort? valves, etc. for light leaks. Replace as necessary.

  • Page 8: Low/High/Drifting Readings

    TD-20/20 Luminometer Service Manual LOW/HIGH/DRIFTING READINGS Symptom Problem/Solution Low reading 1. Sample not mixed completely; all sample not at the bottom of the tube 2. Using auto-injectors: some reagents can stick in injector pump and tubing, causing interference with chemiluminescent reactions. Clean injector system thoroughly with distilled water;...

  • Page 9: No Response (No Change In Lcd Readings)

    TD-20/20 Luminometer Service Manual NO RESPONSE (NO CHANGE IN LCD READINGS) Symptom: Readings on LCD do not change during integration Action: (no response). Action: Try setting instrument sensitivity using light Check the Sen % (HV) standard. Does Sen % reading on the Diagnostic still = 0 Screen.

  • Page 10: High Voltage Alarm (Hv Bad)

    TD-20/20 Luminometer Service Manual HIGH VOLTAGE ALARM (HV BAD) Symptom: "HV Bad" alarm; Sen % = 0 Action: Action: HV driver circuitry With the power ON, check problem. Contact the the voltage at JP2 on the manufacturer. Main Board. Is it >1.5V?

  • Page 11: Power Alarm (Low Pwr)

    TD-20/20 Luminometer Service Manual POWER ALARM (LOW PWR) Symptom: "Low PWR" alarm Action: Action: Unplug the unit! Finished. Remove the cover and check all cable connections, wires, etc. for loose connections. Check for visible burn Action: spots. Fix any loose connections, Perform preliminary checks etc.

  • Page 12: Problem With Data Collection (Rs-232)

    TD-20/20 Luminometer Service Manual PROBLEM WITH DATA COLLECTION (RS-232) Symptom: Problem with RS-232 serial data output. Action: Action: Action: Unplug the unit! Remove the instrument Try a new cable. Bad connection from the case. Access the RS-232 port Does this correct between main PCB and on the Main Board (P1).

  • Page 13: Lcd Blank Or Dark

    TD-20/20 Luminometer Service Manual LCD BLANK OR DARK Symptom: Action: Action: LCD blank or dark (Make sure power Turn the power OFF using the power Finished, OK by looking for shutter movement switch on the rear panel. Wait a few when unit turned on;...

  • Page 14: Alarm Condition: General Diagnostic Checkpoints

    TD-20/20 Luminometer Service Manual ALARM CONDITION: GENERAL DIAGNOSTIC CHECKPOINTS If there is an alarm condition, check the obvious things first (see Section 2). Then, you may want to check the voltages on jumper JP4 on the Main Board (power supply and signal information). To check these voltages: Unplug the unit.

  • Page 15: Replacing The Nvram Or Eprom

    TD-20/20 Luminometer Service Manual REPLACING THE NVRAM OR EPROM It is possible, after some years use, that a warning screen may come up concerning the start-up test and non-volatile data (NEW/BAD NVRAM). This indicates that the Luminometer internal computer battery for data storage may be low. The instrument will still operate, but when the battery fails, every time it is turned off it will not retain instrument parameters and previous calibration settings.
  • Page 16 TD-20/20 Luminometer Service Manual gently press the pins into the sockets. When you are sure all pins are properly seated, use the flat side of a screwdriver to press the module evenly all around, making sure it is in as far as it will Make a visual check of the inside components to make sure no wiring is hung up and that everything appears to be secure.
  • Page 17 TD-20/20 Luminometer Service Manual Take the new EPROM module. Locate the notch on the module. The module must be installed in the correct orientation, with the notch to your right with the front of the instrument toward you. CAUTION! Incorrect installation will damage the module. The Main Board and IC socket are...

  • Page 18: Appendix 1 Main Board Layout

    TD-20/20 Luminometer Service Manual Appendix 1 MAIN BOARD LAYOUT 998-2021 Rev. 1.0 Page 18...

  • Page 19: Appendix 2 Replacement Parts

    TD-20/20 Luminometer Service Manual Appendix 2 REPLACEMENT PARTS Contact the manufacturer for prices and additional parts. Refer also to the TD-2020 Ordering Information Booklet for items such as injector tubing and valves, reagents, instrument power supply, etc. Part Description Part Number...

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