TD-700 FLUOROMETER SERVICE MANUAL
Contents
1. but do not overtighten 7000 996 July 22 1996 Page 4 TD 700 Fluorometer Service Manual SECTION 3 TROUBLESHOOTING GUIDE WARNING High voltage up to 1000 volts may be present inside the instrument Use caution in the area around connector JP1 on the S7 HV board Some versions A amp B of the TD 700 have large orange capacitors on the S7 HV board these should be avoided A LAMP FLUORESCENT WARNING e Use caution when handling the lamp it may be hot 60 C e Do not look at a lit lamp without eye protection safety glasses UV light can injure your eyes The lamp is located inside the lamp compartment accessible from the rear panel a To access it pull on the two black release latches on the rear panel Remove the lamp by grasping it CAUTION may be HOT turning it 90 and sliding it out to your right and toward you b Note that there is an override switch that prevents the lamp from lighting when the lamp access panel is removed For some tests this switch must be held in the ON position pushed in Use a pencil to hold it in the ON position C It is possible for the lamp to appear to be on yet still need replacing The lamp should light throughout the entire length and should not be flickering See Figure 1 for an ohm check of the lamp d There are two lamp sockets top and bottom Each socket has two contact posts Test the lamp socket voltages with the lamp removed override swit2. _ 845 W Maude Avenue Sunnyvale CA 94085 D 408 749 0994 FAX 408 749 0998 wwwturnerdesigns com Toll free 1 877 316 8049 m TURNER DESIGNS TD 700 FLUOROMETER SERVICE MANUAL July 1996 CONTENTS Section 1 INTRODUCTION Section 2 PRELIMINARY CHECKS Section 3 TROUBLESHOOTING GUIDE Lamp Fluorescent Lamp Heater Fan Halogen Lamp No Response no change in LCD readings High Voltage Alarm HV bad Power Alarm Low Pwr Problem with Data Collection RS 232 Keypad LCD Blank or Dark LCD Flashing Alarm Condition General Diagnostic Checkpoints Replacing the NVRAM or EPROM Reset the System NVRAM to Default A B C D E F G H l J K L M N Appendix1 BOARD LAYOUTS A S7 HV Board Versions A amp B B S7 HV Board Versions C amp later C S7 Main Board Appendix2 REPLACEMENT PARTS 7000 996 July 22 1996 Page 1 TD 700 Fluorometer Service Manual SECTION 1 INTRODUCTION This manual will help you troubleshoot and repair most of the common problems encountered with the TD 700 Fluorometer 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 Materials required Digital voltmeter Standard electronics tools It has been our experience that what might at first appear to be an electronic failure often turns out to be oper
3. on the back of the lamp housing check the red black wires leading to the main power Are wires loose Action Bad famp fan assembly or circuitry Replace the door lamp fan assembly 7000 996 July 22 1996 Page 9 TD 700 Fluorometer Service Manual E NO RESPONSE NO CHANGE IN LCD READINGS Symptom Readings on LCD do not change no response Action Check the Sen HV reading on the Yes Diagnostic Screen Does it 0 Action HV circuitry problem alarm Contact the manufacturer Action Make sure the shutter mechanism is working Push in the shutter pin on the lip of the sample compartment opening Do the readings change No Action Check the optics fitters and posi tioning of the sample adaptor Pull out the adaptor depress the pin to open the shutter Do the LCD read ings change Action If the Sen is gt 0 then check the lamp see No previous sections on the lamps ts the lamp OK Bad shutter mecha nism Contact manufacturer Action Change the lamp Sen HV should retum to normal range Action Problem with the optics Make sure the correct excitation and emission filters are installed in the correct positions and that the adaptor is positioned properly in the sample compartment Do LCD readings respond If yes finished No Action Unplug the unit Check connection JP5 on the main ci
4. on the end of JP1 Any loose connections door panel so override switch activates Action Unpiug the unit Ohm check lamp sockets to wires on JP1 on the S7 HV board see Appendix A or B Lamp removed override switch pushed in Are readings lt 1 ohm nat infinity Yes Action Fix loose wires either at lamp sockets or JP1 Lamp should now tight Action Lamp circuitry bad contact manufacturer 7000 996 July 22 1996 Page 6 TD 700 Fluorometer Service Manual B LAMP HEATER FLUORESCENT LAMP Heater is deactivated if the lamp is not on or if the halogen lamp is used Symptoms Readings drifting Lamp flickering Action CAUTION Lamp heater may reach 60 C Lightly touch metal piece near the bottom lamp socket Is it warm indicating the lamp heater is working Action Is the voltage about 1 2V Action 1 Go to section 3A and check the lamp override switch etc If this does not correct the problem then 2 Bad S7 HV board contact manufacturer Action Finished Go to section 3A Lamp Fiuorescent 7000 996 July 22 1996 With the connector in place check connector JP6 on the S7 HV board with a voltmeter across the 2 pins Power on lamp on override switch pushed in Action Bad lamp heater circuitry Contact manufacturer Page 7 TD 700 Fluorometer Serv
5. 1996 Page 3 TD 700 Fluorometer Service Manual d Lift off the case CAUTION Take care not to damage the ribbon cable to the LCD keypad when removing the case There is a second rubber or paper type gasket underneath the case on top of the sample chamber opening take care not to damage this gasket 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 Visually and manually check for broken wires CAUTION If the HV wire white wire on the end of connector JP1 is broken and your instrument is the version with the orange capacitors discharge it BEFORE you examine it or you may receive a shock To discharge connect an insulated wire to the chassis and press the other end of the wire to the HV wire pad on the PCB Visually and manually check for loose integrated circuits IC Are the IC s snugly pressed into the IC sockets Check for any moisture on the printed circuit boards PCB s or on the components If you find moisture use a fan to dry the PCB s Check for corrosion on the printed circuit boards PCB s or on the components If corrosion is found a TURN OFF THE INSTRUMENT b Use a fine wire brush to remove corrosion c Use isopropyl alc
6. 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 go Make a visual check of the inside components to make sure no wiring is hung up and that everything appears to be secure Plug in the instrument and turn on the power the new version and date with appear on the Title screen Check for normal operation by paging through screens etc Reinstall the instrument in the case Use care when reinstalling improper installation will result in poor performance a Make sure the first rubber or paper gasket is undamaged and correctly in place on top of the sample chamber opening Be sure all wiring and ribbon cable connectors are inside the unit then carefully replace the case taking care not to hang up on any wiring b Replace and loosely tighten the 10 bottom panel screws and the 8 rear panel screws c Make sure the second rubber or paper gasket is undamaged and correctly in place on top of the case over the sample chamber opening d Replace the lid and the 4 screws Tighten snugly but do not overtighten e Finally tighten snugly the 10 bottom panel screws and the 8 rear panel screws but do not overtighten 7000 996 July 22 1996 Page 18 TD 700 Fluorometer Service Manual RESET THE SYSTEM TO DEFAULT Resetting to system defaults may help if calibration is difficult or sensitivity is too high or too low and calibra
7. ator error or a loose connector or other simple malfunction We strongly suggest you check the simple and obvious things first See SECTION 2 SECTION 3 describes troubleshooting by looking at the symptoms including cases where an alarm is triggered Section 3L describes general diagnostic checkpoints in alarm conditions You will find board layouts for locating components and checkpoints in Appendix 1 A parts list for ordering replacement parts can be found in Appendix 2 7000 996 July 22 1996 Page 2 TD 700 Fluorometer Service Manual SECTION 2 PRELIMINARY CHECKS WARNING High voltage up to 1000 volts may be present inside the instrument Use caution in the area around connector JP1 on the S7 HV board Some versions A amp B of the TD 700 have large orange capacitors on the S7 HV board these should be avoided Troubleshooting should be performed in this sequence a Check for SOFTWARE problems i e make sure operational parameters are correctly set make sure calibration has been performed properly check for correct standards etc if applicable If sensitivity is an issue or calibration seems ineffective or difficult you might want to try resetting the system parameters to default see Section N b Check for MECHANICAL problems i e correctly installed undamaged filters and lamp correctly installed sample adaptor sample compartment lid closed lamp door shut and latched power supply securely attached
8. ch pushed in unit plugged in and power ON See Table 1 for lamp socket voltages Connect the negative lead of the voltmeter to the instrument chassis touch the positive lead to the checkpoint Figure 1 Ohm Check of Lamp Table 1 Lamp Socket Voltages 10 30 ohms across 2 pins Socket Voltage JP1 Wire Top back 45 50 VDC Black Top front 0 VDC White Bottom back 0VDC Red Bottom front OVDC Green Open circuit end to end Lamp removed power ON override switch pushed in 10 30 ohms across 2 pins 7000 996 July 22 1996 Page 5 TD 700 Fluorometer Service Manual A LAMP FLUORESCENT Continued Symptom Lamp does not light Action Ohm check the tamp Should be 10 20 ohm across both sets of pins see Figure 1 is the lamp OK tamp if lamp lights finished If not check the override switch Action Make sure lamp is correctly installed or Yes install a new lamp Action Action Check the override switch Check lamp socket voltage with by pushing it in Should voltmeter see Table 1 With the hear a click and lamp lamp removed override switch should light Does it light pushed in instrument ON is it 45 50 l VDC on the top rear most socket Yes No Yes Action Adjust door latch Action Unplug the unit Check connector JP1 on the S7 HV board for loose wires black white red green for lamp CAUTION Avoid white HV wire
9. e from its socket Pry up the left side slightly then the right side alternating sides until the pins are clear of the sockets Set the module aside 6 Take the new NVRAM module marked MK48Z08B XX Locate the notch on the NVRAM module The NVRAM 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 NVRAM The S7 Main Board is marked with white lines that show the proper orientation Line up this small box with the notch on the module 7 Install the new NVRAM Module into the empty socket Examine the module before installing to make sure all pins are straight Carefully line up the rows of pins with the rows of sockets Then 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 go 7000 996 July 22 1996 Page 16 TD 700 Fluorometer Service Manual 10 Make a visual check of the inside components to make sure no wiring is hung up and that everything appears to be secure Plug in the instrument and turn on the power When the instrument is first powered up a New NVRAM screen will be displayed Check for normal operation by paging through screens etc Reinstall the instrument in the case Use care when reinstalling improper installation will result in poor p
10. erformance a Make sure the first rubber or paper gasket is undamaged and correctly in place on top of the sample chamber opening Be sure all wiring and ribbon cable connectors are inside the unit then carefully replace the case taking care not to hang up on any wiring b Replace and loosely tighten the 10 bottom panel screws and the 8 rear panel screws c Make sure the second rubber or paper gasket is undamaged and correctly in place on top of the case over the sample chamber opening d Replace the lid and the 4 screws Tighten snugly but do not overtighten e Finally tighten snugly the 10 bottom panel screws and the 8 rear panel screws but do not overtighten INSTALLING THE EPROM Refer to the S 7 Main Board Diagram in Appendix 1C to locate the EPROM module DO NOT TOUCH THE EPROM PINS static electricity can damage the EPROM Before handling new EPROM discharge static electricity by touching chassis of instrument 1 2 UNPLUG THE INSTRUMENT Remove the instrument from the case a Using an Allen wrench remove the 4 screws holding the lid on Take off the lid There will be a rubber or paper type gasket underneath the lid take care not to damage it b Remove the 8 screws on the back panel Remove the 10 screws from the bottom panel Lift off the case CAUTION Take care not to damage the ribbon cable to the LCD keypad when removing the case There is a second rubber or paper type gasket underneath
11. etc C Finally perform electronic diagnostics as found in this Service Manual If you experience an apparent instrument failure follow the following steps in order before going on to SECTION 3 1 Verify that the power source at your site is working and appropriate for your instrument i e 100 240 VAC Check for blown fuses and check circuit breakers at your site 2 Make sure the power supply is securely plugged into the socket on the back panel and that the instrument s power switch is ON If the power plug into the unit is loose then UNPLUG THE UNIT Take a small screwdriver and insert it into the slot in the center pin of the power plug socket on the rear panel Widen the gap so the plug holds more securely To test plug in the unit and turn power switch ON Check the instrument s power supply the green LED light on the power supply should be on when connected to the power source 3 Make sure the lamp inside the sample compartment is working see SECTION 3A or 3D For further instructions refer to the appropriate section in your user s manual 4 UNPLUG THE INSTRUMENT FROM THE POWER SOURCE Remove the instrument from the case a Using an Allen wrench remove the 4 screws holding the lid on Take off the lid There will be a rubber or paper type gasket underneath the lid take care not to damage it b Remove the 8 screws on the back panel c Remove the 10 screws from the bottom panel 7000 996 July 22
12. ft off the board and set it gently on paper or plastic no conductive surfaces such as metal Versions C and later of TD 700 have a cutout so that JP4 can be accessed without removing the S7 HV board 3 Plug in the unit and turn on the power 4 Locate connector JP4 on the Main board Pins are numbered from front to back starting with Pin 1 Note that the numbers on the connector itself may be reversed i e 10 pin 1 5 Connect the negative lead of your voltmeter to the chassis touch the positive lead to the checkpoint Check and record the voltages according to Table 2 Table 2 JP4 Diagnostic Checkpoints Description Normal Voltage Voltage Reading al to back If voltages are not within normal range return to manufacturer If readings are not normal it means Pin 10 Problem with the 2 Volt Reference IC Pins 1 8 amp 9 Problem with DC to DC Convertor Pin 7 Problem with 5 Volt Voltage Regulator 7000 996 July 22 1996 Page 15 TD 700 Fluorometer Service Manual M 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 fluorometer 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 parameter and previous calibration settings The current batte
13. ice Manual C FAN Symptom Fan does not come on Action Make sure door fan assembly is plugged in inside the lamp compartment Does the fan come on Action Unplug the unit Take a small screw driver and insert It into the slot in the center pin of the fan socket inside the lamp compartment Widen the gap so that the plug holds more securely Does the fan come on when plugged in Action Bad door fan assembly or circuitry Replace the door fan assembly 7000 996 July 22 1996 Page 8 TD 700 Fluorometer Service Manual D HALOGEN LAMP WARNING Use caution when handling the lamp it may be hot Do not touch the lamp bulb with an ungloved hand oils from your hand will affect bulb s transmittance and will reduce the life of the lamp The lamp is located inside the lamp compartment accessible from the rear panel a To access it pull on the two black release latches on the rear lamp door panel b Power jack must be plugged in inside the lamp compartment for the fan to operate Symptom Halogen lamp does not light Fan is on so there is power Action Change the lamp bulb DO NOT touch bulb with ungloved hand Does it light Action Fix loose connec tions Does lamp light If yes finished Action Unpiug the unit Check for loose wires YeS connections for the lamp fan power or sockets Inside the unit
14. ohol to remove any residue Note that the areas underneath the components the sockets and connectors may be corroded if there is moisture The chips on the LCD are especially susceptible to corrosion If corrosion is extensive or if the IC s or sockets are affected it is probably best to replace the board Check for burned areas on the printed circuit boards PCB s or on the components If there are black areas clearly burned then components may have to be replaced and or traces may have to be reconstructed with wires If damage is extensive it is probably best to replace the board To retest plug the instrument in BE CAREFUL OF HIGH VOLTAGE POINTS Turn it on using the power switch on the rear panel If the instrument still does not work properly go on to SECTION 3 To reassemble the instrument a Make sure the first rubber or paper gasket is undamaged and correctly in place on top of the sample chamber opening Be sure all wiring and ribbon cable connectors are inside the unit then carefully replace the case taking care not to hang up on any wiring b Replace and loosely tighten the 10 bottom panel screws and the 8 rear panel screws c Make sure the second rubber or paper gasket is undamaged and correctly in place on top of the case over the sample chamber opening d Replace the lid and the 4 screws Tighten snugly but do not overtighten e Finally tighten snugly the 10 bottom panel screws and the 8 rear panel screws
15. ons readable the LCD to the Main board JP1 Are securely If reading connections loose on LCD appears Yes then finished No Action Action Bad cable LCD or microproces e N2 Finish ed sor contact manufacturer K LCD FLASHING Symptom LCD flashing or blinking Action Tum the unit OFF using the power switch on the rear panel Wait a few seconds Turn power ON Does the flashing stop 7000 996 July 22 1996 Action Possible that the NVRAM iC or the microprocessor is bad Contact manufacturer for NVRAM installation instructions Page 14 TD 700 Fluorometer Service Manual L ALARM CONDITION GENERAL DIAGNOSTIC CHECKPOINTS WARNING High voltage up to 1000 volts may be present inside the instrument Use caution in the area around connector JP1 on the S7 HV board Some versions A amp B of the TD 700 have large orange capacitors on the S7 HV board these should be avoided If there is an alarm condition check the obvious things first see Section 2 Then you may want to check the voltages on connector JP4 on the Main Board power supply and signal information To check these voltages 1 Unplug the unit 2 Remove the instrument from the case see Section 2 4 3 For versions A amp B ONLY of TD 700 you may have to remove the S7 HV board to access JP4 To remove it remove the 4 nuts holding the board in place including any plastic ties present Carefully li
16. rcuit board Any loose connections Action Yes Fix loose connection Do LCD readings respond If yes finished Action Bad HV circuitry or probiem with PMT signal contact manufacturer 7000 996 July 22 1996 Page 10 TD 700 Fluorometer Service Manual F HIGH VOLTAGE ALARM HV BAD WARNING High voltage up to 1000 volts may be present inside the instrument Use caution in the area around connector JP1 on the S7 HV board Some versions A amp B of the TD 700 have large orange capacitors on the S7 HV board these should be avoided Action i Action With the power ON check the voltage No HV driver circuitry at JP2 on the S7 HV board problem Contact Is it gt 1 5V the manufacturer Action Make sure that there Is no jumper across pins on connector JP2 on the S7 HV board Is there a jumper Yes CAUTION Beware high voltage Action Check the HV output set voltmeter to 1000 V range pin 10 white wire on JP1 on the S7 HV board Is it gt 100V Action Check the input of the HV module versions C and later only transistor Q1 at emitter pin on the S7 HV board is it gt 1 2V Yes Remove jumper HV should return to normal es No Action Probiem with Q1 Contact manufac turer Action Bad connection in pre amplifier or HV monitoring circuitry problem Contact manufacturer Action l Problem with HV mod ule Con
17. ry has a 10 year life specification This situation can be solved temporarily by leaving the instrument ON at all times until the NVRAM module can be changed If it is turned off instrument parameters will have to be reset and the instrument recalibrated On rare occasions the EPROM may be replaced in order to update the instrument to the latest version INSTALLING THE NVRAM MODULE Refer to the S 7 Main Board Diagram in Appendix 1C to locate the NVRAM module DO NOT TOUCH THE NVRAM PINS static electricity can damage the NVRAM Before handling new NVRAM discharge static electricity by touching chassis of instrument 1 UNPLUG THE INSTRUMENT 2 Remove the instrument from the case a Using an Allen wrench remove the 4 screws holding the lid on Take off the lid There will be a rubber or paper type gasket underneath the lid take care not to damage it b Remove the 8 screws on the back panel Remove the 10 screws from the bottom panel d Lift off the case CAUTION Take care not to damage the ribbon cable to the LCD keypad when removing the case There is a second rubber or paper type gasket underneath the case on top of the sample chamber opening take care not to damage this gasket O 4 Now as you face the front of the instrument locate the NVRAM module to your left near front on the S7 Main Board nearest the bottom of the instrument 5 Take a small flathead screwdriver and GENTLY pry the NVRAM modul
18. tact manufac turer 7000 996 July 22 1996 Page 11 TD 700 Fluorometer Service Manual G POWER ALARM LOW PWR Symptom Low PWR alarm Action Unplug the unit Remove the cover and chack all cable connections Action wires etc for loose connections Check for visible bum spots Fix any Sale staan i loose connections etc Does this power i Section 2 paragraphs Seed Ss eee 1 amp 2 Does this correct the problem Action Action Tum power ON Check Could be a bad power supply or a bad JP4 JP5 on board on the power switch Make sure you have S7 HV board witha probe checked the items in paragraphs 1 and across the wires Is it 12V 2 of Section 2 To check switch with t 5 power ON check the voltage at the red connector bottom from the power Switch on the rear panel Is it 12V main board is bad Contact manufac turer Action With the power switch in the ON position check the voltage at the top connector from the power switch on the rear panel is it 12V Action Action Loose connection some Bad switch Contact where or bad power manufacturer supply or loose power plug see 1 amp 2 Section 2 7000 996 July 22 1996 Page 12 TD 700 Fluorometer Service Manual H 7000 996 July 22 1996 PROBLEM WITH DATA COLLECTION RS 232 Symptom Problem with RS 232 serial data output Action Bad connection between main PCB and RS 232 o
19. the case on top of the sample chamber opening take care not to damage this gasket and Now as you face the front of the instrument locate the EPROM module to your left near the front edge of the board to the right of the NVRAM on the S7 Main Board nearest the bottom of the instrument Take a small flathead screwdriver and GENTLY pry the module from its socket Pry up the left side slightly then the right side alternating sides until the pins are clear of the sockets Set the module aside 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 S7 Main Board is marked with white lines that show the proper orientation Line up this small box with the notch on the module 7000 996 July 22 1996 Page 17 TD 700 Fluorometer Service Manual 10 Install the new Module into the empty socket Examine the module before installing to make sure all pins are straight There are more sockets then there are pins so the module should be installed with the pins on the un notched end of the module inserted flush with the sockets on the side closest to the NVRAM This means that 2 sockets on each row will be empty on the right side of the module base Carefully line up the rows of pins with the rows of sockets Gently press the pins into the sockets
20. the board CAUTION miah Voltane n AN wives 7000 996 July 22 1996 Page 21 TD 700 Fluorometer Service Manual C S7 MAIN BOARD located closest to the bottom of the instrument FRONT cl C20 H BSS Ioee a m jete Cl ES Ra c34 Ta 2 S76 Convertor ezpa 2Y Regulator C33 cc c6 eD IE 5724 u Ne DRAAI g jes RE c q f IA ceam qe F 5S8 esni zo ar Bel i pemn 24 1 as eal ee I l c i t 7000 996 July 22 1996 Page 22 TD 700 Fluorometer Service Manual APPENDIX 2 REPLACEMENT PARTS Contact the manufacturer for prices and additional parts Part Description EPROM Module Halogen Bulb Keypad with TD 700 Overlay Lamp Heater PCB Assembly Lamp Socket pair LCD Display NVRAM Module On Off Switch Power Cable Assembly internal 12V power lamp RS 232 Ribbon Cable internal S7 HV Board PCB S7 Main Board PCB 7000 996 July 22 1996 Part Number 005 0256 7000 970 7000 979 7000 976 7000 977 7000 978 005 0460 7000 972 7000 973 7000 971 7000 975 7000 974 Page 23
21. ting does not seem to cure the problem NOTE This will completely reset instrument settings including calibration to default After resetting user settings will have to be entered again and a new calibration performed 1 Turn the instrument power OFF then wait for few seconds turn the power ON At screen TURNER DESIGNS T7 1A 03 95 XXX Press lt H gt to screen XXX X fsu lt ENT gt Setup amp Cal Press lt ENT gt to screen 1 Setup 2 Calibration Press lt gt to screen Input Turner Enter lt 1962 gt then press lt ENT gt to screen Lamp ON Xx XXX HV XXX X XXX Press lt ENT gt twice to screen Oper XXX Hrs 1 RESET NVRAM Press lt 1 gt to screen 10 lt 0 gt SYS data Keep pressing lt 0 gt until you see screen TURNER DESIGNS T7 1A 03 95 XXX The instrument is completely reset Calibrate the instrument 7000 996 July 22 1996 Page 19 TD 700 Fluorometer Service Manual APPENDIX 1 BOARD LAYOUTS A S7 HV BOARD Versions A amp B with orange capacitors version is marked on the board CAUTION High Volta Conte wire i apg gt 4 i ar i Oren of High Voltage Cwithin dotted lines sey i ae a Copacitor i E ap Corange i F 4 ai CAUTION 7000 996 July 22 1996 Page 20 TD 700 Fluorometer Service Manual B S7 HV BOARD Versions C and later version is marked on
22. utlet CAUTION Beware high voltage Action Unplug the unit Remove the instrument from the case and remove the HV board by removing 4 nuts including plastic ties _ set beard carefully on paper or plastic Access the RS 232 port on the main board P1 Piug the cable directly into this port and tum on the instrument Oaes a the problem Bad RS 232 circuitry on the main PCB Contact manufacturer i KEYPAD Symptom Certain keys or all keys on keypad do not work Action Bad keypad cable or main PCB Contact manufacturer Action Unplug the unit Remove the instrument from the case and make sure following ar securely seated 1 The cable connector from the back of the keypad to the LCD keypad PCB 2 the connector from the LCD keypad PCB to the main PCB both ends With power ON does this correct the problem Page 13 TD 700 Fluorometer Service Manual J LCD BLANK OR DARK Symptom LCD blank or dark make sure power is OK by seeing that the lamp is ON Action Tum the power OFF using the Action power switch on the rear panel Waita S__4 Finished few seconds and tum the power ON holding the Up Does the LCD appear Arrow if screen blank or the Down No Arrow if screen dark on the keypad Action Unplug the uniti Check both Yes Action Is the LCD now ends of the ribbon cable connections from Plug in connecti
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