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Toshiba TDP-MT8, Service Manual

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Toshiba TDP-MT8 Service Manual Download Page 91

TDP-MT8 Service Guide 

 

91   

Check the Thermal Switch 

The thermal switch is designed to open when the temperature inside the projector gets too high. When 

the switch opens, the power supply shuts down, turning the projector off. 

When the projector shuts down after operating for a few minutes or when the lamp fails to strike after 

repeated attempts at startup, you need to check the thermal switch operation. First, power up the 

projector with the top off (page 86). Let the projector run until it shuts down. Measure the resistance at the 

switch. If the resistance is 

infinity 

(

Ω)

, replace the safety switch assembly, which includes the thermal 

switch. 

 

 

Go to remove and replace the safety switch assembly on page 55. 

Summary of Contents for TDP-MT8

Page 1: ...TDP MT8 FILE NO 330 200209 TDP MT8 DOCUMENT CREATED IN JAPAN Nov 2002 ...

Page 2: ...e Lamp Door and Lamp Module 37 Remove and Replace the Leveling Foot 39 Remove and Replace the Outer Handle 41 Remove and Replace the Power Supply 43 Remove and Replace the Rear and Side IR Receivers and Lenses 47 Remove and Replace the Rear Bezel 51 Remove and Replace the Rear Bezel Feet 53 Remove and Replace the Rubber Feet 54 Remove and Replace the Safety Switch and Lamp Connector Retainer 55 Re...

Page 3: ...rmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense WARNING Changes or modifications made to this equipment not expressly approved by Toshiba or parties authorized by Toshiba could void the user s authority to operate the equipment ...

Page 4: ...le operation of the product and to protect it from overheating and these openings must not be blocked or covered The openings should never be blocked by placing the product on a bed sofa rug or other similar surface This product should not be placed in a built in installation such as a bookcase or rack unless proper ventilation is provided or the manufacturer s instructions have been adhered to IM...

Page 5: ... must remove to access the part you want you will be referred to those removal instructions NOTE You can also see a flow chart of parts removal The FRU Hierarchy on page 6 shows a chart of which parts must be removed to access any replaceable part in the projector Generally the replacement procedure is the reverse of the removal process Sometimes you will find special instructions under Assembly N...

Page 6: ...case Front IR lens Rear IR lens Security plate Rear bezel foot Front IR receiver Elevator button Elevator shaft Fan bracket Fan Right IR receiver Side IR lens Fan mount Left IR receiver Side IR lens Rear IR receiver Controller ECA I O shield Inner handle Front vent Power supply controller ECA cable Lamp control cable Power supply ballast cable Lamp connector retainer Optical engine Elevator spring...

Page 7: ... to measure the output voltage from the ballast when the lamp strikes High voltage produced by the ballast to strike the lamp can ruin test instruments as well as cause personal injury 1 Remove the following items Lamp module see page 37 Outer handle see page 41 Rear bezel see page 51 Top case see page 57 Controller ECA see page 16 2 Remove the two M3x6 Torx screws from the lamp connector retainer...

Page 8: ...connector on the ballast Squeeze the latch on the side of the power supply ballast cable connector to release it The illustrations below show the ballast already removed so you can see it more clearly 4 Remove the two M3x8 screws that fasten the ballast to the chassis 5 Lift the ballast away from the chassis ...

Page 9: ... lamp control cables to their connectors on the ballast Position the bottom of the ballast in the slots in the chassis Make sure the two screw holes in the ballast align with the threaded standoffs on the wall of the chassis Install and torque the two M3x8 Torx screws to 6 in lbs 68 Nm ...

Page 10: ...the chassis near the thermal switch It holds the lamp connector securely in the lamphouse 1 Remove the following items Ballast see page 7 Power supply see page 43 2 Tilt the ballast power supply insulator away from the front wall of the chassis and the ballast mounting standoffs Then lift the insulator out of the projector Assembly Notes Position the ballast power supply insulator in the chassis s...

Page 11: ...57 Inner handle and front vent see page 33 Controller ECA see page 16 Fan assembly see page 26 Chassis see page 13 Optical engine see page 22 Optical engine mounting bracket see page 24 Side IR receivers and lenses see page 47 Rubber feet see page 54 Elevator see page 19 Leveling foot see page 39 2 Remove the serial number label from the certification label To do this carefully use a heat gun or h...

Page 12: ...erial number box Adhere one of the old rubber feet to the foot at the rear of the bottom case Adhere the other rubber foot to the center of the leveling foot knob Use new rubber feet if the adhesive was damaged when you removed the old ones from the old bottom case Replace the parts in the bottom case reversing the order you used to remove them ...

Page 13: ...er lamp connector retainer and safety switch fasten to the chassis The ballast power supply insulator provides electrical insulation between the chassis and components inside it 1 Remove the following items Lamp module see page 37 Outer handle see page 41 Rear bezel see page 51 Top case see page 57 Controller ECA see page 16 Rear IR receiver see page 47 2 Remove the four M3x8 Torx screws that fast...

Page 14: ...side of the chassis above the power supply ground terminal 4 Remove the two M3x6 Torx screws from the lamp connector retainer on the front of the chassis The lamp connector and lamp connector retainer remove with the chassis 5 Lift the chassis from the bottom case ...

Page 15: ...ee page 43 Ballast see page 7 Ballast power supply gasket see page 10 You are left with the bare chassis Assembly Notes Install the parts in the reverse order Torque the two M3x6 Torx screws on the lamp connector retainer to 6 in lbs 68 Nm Torque the five M3x8 Torx screws that secure the chassis in the projector to 6 in lbs 68 Nm ...

Page 16: ...he controller WARNING Be sure to take proper ESD precautions while working near the controller ECA It can be easily damaged by static electricity ECAs damaged by static electricity require replacement 1 Remove the following items Outer handle see page 41 Rear bezel see page 51 Top case see page 57 2 Unplug the two fan cables the front rear and two side IR receiver cables the photodiode cable the l...

Page 17: ...tom of the connector to release it 4 Remove the seven M3x8 Torx screws that fasten the controller ECA to the chassis 5 Lift the controller ECA over the optical engine to release the DMD controller connector 6 Lift the controller out of the projector WARNING Make sure to store the controller ECA in a static safe container ...

Page 18: ...mly You will feel the connector halves engage Use a T 10 driver to install the seven M3x8 Torx screws Torque the screws to 6 in lbs 68 Nm Plug in the controller power supply cable Plug in the two fan cables the front rear and two side IR receiver cables the photodiode cable the light tunnel heater cable and the color wheel ribbon cable Go to page 88 if you need help with the color wheel ribbon cab...

Page 19: ...el of the projected image The elevator housing is molded into the bottom case Except for the housing each part can be replaced separately Remove the Elevator Shaft 1 Remove the following items Outer handle see page 41 Rear bezel see page 51 Top case see page 57 2 Use a small screwdriver to move the elevator actuator toward the right side of the projector This disengages the actuator and allows the...

Page 20: ... and out of the bottom case CAUTION Take care when prying the stop It can easily break If a stop breaks the bottom case must be replaced 4 Pull the elevator shaft out from the bottom side of the projector Remove the Elevator Spring and Actuator 1 Remove the elevator shaft then remove the Optical engine see page 22 2 Use a small screwdriver or angled pick to remove the elevator spring from the slot...

Page 21: ...de tabs in the bottom case Assembly Notes Install the elevator actuator first and move it as far to the right as possible The install the elevator shaft Move the actuator to the left as far as possible Then press the elevator spring into the slot in the actuator A tab on the actuator holds the spring in its recess ...

Page 22: ...o a dump light area inside the engine DMD driver board formats the image signal for interpretation by the DMD Color wheel provides colors for the DMD to use in image production Light tunnel conducts focused light from the lamp module to the DMD Photodiode reads color wheel rotation to maintain proper synchronization with the DMD and allow accurate color reproduction Projection lens focuses or chan...

Page 23: ...ket 4 Grasp the engine around the projection lens barrel Then lift the engine up out of the case 5 Place the engine on a static free surface or in an ESD protected container Assembly Note Make sure the engine aligns with the holes in the mounting bracket Torque all five of the M3x8 Torx screws to 6 in lbs 68 Nm ...

Page 24: ...e the following items Lamp door and lamp module see page 37 Outer handle see page 41 Rear bezel see page 51 Top case see page 57 Inner handle and front vent see page 33 Controller ECA see page 16 Optical engine see page 22 2 Remove the M3x8 Torx screw that fastens the lip at the front of the chassis to the bottom case It is not necessary to remove any of the other chassis screws ...

Page 25: ...at the front and remove it from the bottom case Assembly Notes Place the rear of the mounting bracket beneath the lip at the front of the chassis Make sure the bracket aligns with the holes in the bottom case Torque the three M3x8 Torx screws to 6 in lbs 68 Nm Torque the M3x8 Torx screw at the front of the chassis to 6 in lbs 68 Nm ...

Page 26: ...e left IR receiver cable from connector J508 and the fan cables from connectors J506 and J517 on the controller ECA 3 Lift the fan bracket from the bottom case 4 Separate either fan from the fan bracket by removing the two M3x25 Phillips screws from the diagonal corners of the fan frame NOTE You don t need to separate either fan from the fan bracket if you re removing the fan assembly to gain acce...

Page 27: ...bracket Torque the two screws to 6 in lbs 68 Nm Make sure bottom and sides of the fan bracket engage the slots in the bottom case and the front vent The fan bracket fits into the bottom case only one way Plug the cable from the fan nearest the lamp into connector J506on the controller ECA The cable from the fan nearest the power supply plugs into connector J517 on the controller ECA Plug the cable...

Page 28: ... zoom ring snap into place on the lens barrel They can be replaced without removing any other projector parts Three retainer slots inside the zoom ring engage alignment pins on the outside of the lens Three retainer tabs on the zoom ring engage holes on the lens barrel 1 Place the projector right side up on a soft work surface 2 Grasp the focus ring and pull it off of the lens barrel The retainer ...

Page 29: ...nd insert a small flat blade screwdriver into one of the zoom ring recesses Gently pry the retainer tab away from the lens The tab releases the engagement hole on the lens barrel 4 Gently pull forward on the zoom ring and repeat step 3 for the other two retainer tabs ...

Page 30: ...ring onto the lens barrel The lens barrel should fit snugly against the collar inside the zoom ring Rotate the zoom ring to ensure that the tabs properly engage the holes Align the three slots on the focus ring with the three alignment pins on the end of the lens barrel Press the focus ring into place Rotate the focus ring to ensure that the slots properly engage the alignment pins Place the lens ...

Page 31: ...er ECA The receiver works with others at the rear and both sides of the projector to provide omni directional reception of commands from the remote control 1 Remove the following items Outer handle see page 41 Rear bezel see page 51 Top case see page 57 2 Unplug the front IR receiver cable it from J500 on the controller ECA 3 Slide the front IR receiver upward and out of the alignment slots in the...

Page 32: ...he cable to the left of the front IR receiver ECA and through the saddle at the top of the inner handle Make sure that the front IR receiver ECA properly engages the alignment slots in the inner handle Connect the cable to J500 on the controller ECA ...

Page 33: ...ner handle from the side of the projector opposite the lens Swing the handle upward slightly then lift it from the bottom case 3 Separate the front vent from the inner handle by using a small flat blade screwdriver to disengage the tab on the front vent from the slot on the inner handle NOTE You don t need to separate the front vent from the inner handle if you re removing the inner handle to acce...

Page 34: ...embly Notes Make sure that the tabs on the inner handle properly engage the slots on the front vent Position the front vent in the slots in the bottom case Make sure that it fits properly and that the side of the fan bracket rests in the vertical slot along the back of the vent ...

Page 35: ... items Outer handle see page 41 Rear bezel see page 51 Top case see page 57 2 Remove the six 4 40 jack screws that fasten the EMI shield to connectors on the controller ECA 3 Carefully pull the I O EMI shield off of the connectors Take care not to bend the shield or the fingers as you work the shield off Assembly Notes Make sure the fingers on the shield contact the connectors Torque the jack scre...

Page 36: ...y set out of the top case 5 Use a small flat blade screwdriver to lift one corner of the keypad reflector Then lift the reflector out of the keypad recess in the top case Assembly Notes The keypad ECA the key set and the keypad reflector fit only one way in the top case Make sure that the alignment holes in the keypad ECA fit over the pins in the top case If the keypad reflector is new remove the ...

Page 37: ...d arc tube A blower on the side of the lamp module provides cooling air to the arc tube and reflector inside of the housing CAUTION The lamp module gets very hot during operation Allow the lamp to cool for 30 minutes before handling it The lamp module gets very hot during operation Allow the lamp to cool for 30 minutes before handling it 1 Place the projector upside down on a soft work surface 2 T...

Page 38: ...s folded down in storage position It snaps into position NOTE If the lamp door does not fit flush in the door opening it is probably because the bail is not completely folded down You must replace the lamp door for the projector to operate If you installed a new lamp module follow the directions below to reset the lamp timer Press the Menu button and navigate to the Main Menu Settings Service menu...

Page 39: ... move up and down You can order either piece individually Remove the leveling foot knob 1 Place the projector upside down on a soft work surface 2 Rotate the leveling foot counterclockwise until it is fully extended 3 Remove the rubber foot from the knob Save the foot for use with the replacement knob 4 Remove the M3x8 Plastite Torx screw in the center of the knob Remove the leveling foot shaft 1 ...

Page 40: ...eveling foot knob Make sure the knob properly fits the key on the shaft before inserting the screw Torque the M3x8 Plastite Torx screw to 4 in lbs 45 Nm Press the rubber foot into the hole over the screw head Use a replacement rubber foot if the adhesive fails to hold the old foot tightly in place Adjust the leveling foot knob to be level with the bottom of the projector ...

Page 41: ...t of the projector and hold the outer handle in place The outer handle contains the front IR lens The lens snaps into the recess in the outer handle A new outer handle does not include a front IR lens 1 Insert a small flat blade screwdriver behind the edge of the outer handle near the lens 2 Gently pry the edge of the outer handle away from the projector CAUTION Don t pry against the focus ring or...

Page 42: ...m its slot on the outer handle Assembly Notes Align the two tabs on the front IR lens with the slots on the outer handle Press the lens into place to secure it Position the outer handle against the front of the projector so that the pins align with the holes in the top and bottom case tabs Then press the outer handle into place against the front of the projector ...

Page 43: ...ugh the power supply controller ECA cable to provide DC power and exchange control signals A fuse on the back of the power input connector protects against internal shorts or supply surges 1 Remove the following items Outer handle see page 41 Rear bezel see page 51 Top case see page 57 Controller ECA see page 16 2 Unplug the safety switch cable from J3 on the power supply Then unplug the power sup...

Page 44: ...he side of the chassis 4 Use a Torx T 10 screwdriver to remove the seven M3x8 screws that fasten the power supply to the chassis 5 Lift the forward side of the power supply to allow the AC line connector to pass through the hole in the chassis Then lift the power supply away from the chassis ...

Page 45: ...Use a small flat blade screwdriver to disengage the fuse from the fuse holder on the back side of the power input connector 2 Replace the fuse by pressing it into the fuse holder Make sure the fuse is properly engaged at each end of the fuse holder ...

Page 46: ...o 6 in lbs 68 Nm Connect the ground terminal to the chassis Torque the M3x8 Torx screw to 6 in lbs 68 Nm Connect the safety switch cable to J3 on the power supply Then connect the power supply controller ECA cable to P1 the ballast power supply cable to J1 and the lamp control cable to J4 on the power supply Make sure that you route the safety switch cable through the eye at the front left side of...

Page 47: ... protected by the rear IR lens in the rear bezel Any of the IR receivers or lenses above may be replaced separately If you need to replace the rear IR lens see Remove and Replace the Rear Bezel on page 51 for information 1 Remove the following items Outer handle see page 41 Rear bezel see page 51 Top case see page 57 Fan assembly applies to rear IR receiver only see page 26 Rear IR Receiver 1 Unpl...

Page 48: ...ft or Right Side IR Receivers and Lenses The side IR lenses hold the left and right side IR receivers in the bottom case You use the same procedure to remove or replace either side IR receiver or lens 1 Unplug the left side IR receiver from J508 or the right side IR receiver from J514 on the controller ECA 2 Gently pull upward on the lens tab to disengage the slot from the tab on the IR receiver ...

Page 49: ...iver from the lens 4 Remove the lens from the bottom case using a small flat blade screwdriver Gently pry the slot on either vertical side of the lens away from the tab on the bottom case 5 Push the lens outward through the side of the bottom case ...

Page 50: ...the taper on the side of the bottom case Make sure that the tabs on the IR receiver fully engage the slots in the IR lens Route the cable on the left IR receiver through the large notch at the top middle of the fan bracket Connect the cable on the left side IR receiver to J508 or the cable on the right side IR receiver to J514 on the controller ECA ...

Page 51: ... lens and security plate If you replace the rear bezel you need a replacement I O panel label You cannot remove the label from the rear bezel A new rear bezel does not include a rear IR lens or security plate 1 Remove the two M3x8 Torx screws from the rear bezel 2 Pull the rear bezel away from the projector 3 Remove the rear IR lens and save it for use with the replacement rear bezel Press on one ...

Page 52: ...el to the outside of the bezel Align the two tabs on the rear IR lens with the slots on the rear bezel Press the lens into place against the outside of the rear bezel Affix the security plate to the inside of the bezel If the plate is new remove the protective paper from the adhesive before installing it Position the security plate in the recess on the inside of the rear bezel Press the plate firm...

Page 53: ...eners 1 Remove a rear bezel foot by inserting a small flat blade screwdriver or dental pick between the foot and the rear bezel 2 Gently peel the foot away from the bezel You don t need to remove any adhesive remaining on the rear bezel after you remove the foot To replace a bezel foot peel the protective paper from the replacement foot Then press the foot into the recess on the rear bezel ...

Page 54: ... projector One foot adheres to the bottom case while the other foot adheres to the bottom of the leveling foot knob 1 To replace a rubber foot peel the protective paper from the replacement foot Then press the foot into the recess in the bottom case If you need to remove an old rubber foot gently pry it away from the bottom case ...

Page 55: ...safety switch share a common cable to the power supply A new safety switch includes a thermal switch The lamp connector retainer fastens to the chassis near the thermal switch It holds the lamp connector in a secure position in the lamphouse Remove the following item Chassis see page 13 Safety Switch 2 Unplug the safety switch cable from J3 on the power supply Then remove the M3x6 Torx Plastite sc...

Page 56: ...e slot in the bottom case near the lamp cavity A tab on the lamp door fits through the slot to close the safety switch when the lamp door is in place Torque the two M2x8 Torx screws to 6 in lbs 68 Nm Orient the thermal switch on lamp connector retainer so that the screw hole on the switch aligns with the hole in the retainer The white lettering on the switch should face up Torque the M3x6 Torx Pla...

Page 57: ...re a new nameplate to the top case A new top case contains two speakers You cannot remove the speakers from the top case 1 Remove the following items Rear bezel see page 51 Outer handle see page 41 2 Place the projector right side up on the bench and then remove the two black M3x8 Torx screws from the bottom case 3 Slowly lift the top case away from the projector Avoid stress on the cables that ru...

Page 58: ... case parts see page 59 and save them for use with the replacement top case Assembly Notes If you re replacing the top case with a new one install the top case parts see page 59 that you removed from the old one Adhere a new nameplate to the top case in the recess near the handle Connect the keypad lamp blower contact ECA cable the speaker cable and the keypad cable Make sure that the top case fit...

Page 59: ...are part of the top case You cannot remove them 1 Remove the following items to access the top case parts Rear bezel see page 51 Outer handle see page 41 Top case see page 57 2 Place the top case face down on a soft work surface Keypad Parts 1 Remove the eight black M3x6 Plastite Torx screws that fasten the keypad to the top case Then lift the keypad ECA out of the recess in the top case ...

Page 60: ... Service Guide 60 2 Gently lift the key set out of the top case 3 Use a small flat blade screwdriver to lift one corner of the keypad reflector Then lift the reflector out of the keypad recess in the top case ...

Page 61: ... the pins in the top case If the keypad reflector is new remove the protective paper from the adhesive before installing it Position the reflector in the recess on the inside of the top case Press the reflector firmly against the top case Make sure that the collar on each key fits flush against its hole in the top case Torque the eight black M3x6 Plastite Torx screws to 4 in lbs 452 Nm ...

Page 62: ...te Torx screws that fasten the lamp blower contact ECA to the top case Then lift it out of the top case Assembly Notes Make sure that the pin on the inside of the top case engages the hole in the lamp blower contact ECA Torque the two black M3x8 Plastite Torx screws to 4 in lbs 452 Nm ...

Page 63: ...TDP MT8 Service Guide 63 Elevator Button 1 Use a small flat blade screwdriver to depress the retainer tab on the side of the elevator button 2 Slide the button out of the top case ...

Page 64: ...ource The VCR must include an S video connector in addition to a composite connector Commercially produced video to test S video composite video and audio You ll need the video in DVD laser disc or videocassette format Use Video Essentials Optimizing Your Audio Video System DVD International 1997 available at http www infocus com service asc lp530 english tests_ve asp Audio Video cables Use the Di...

Page 65: ... lens is at a 90 angle to the wall Verify that the elevator and leveling foot are functional Verify that the focus and zoom rings operate properly Verify cosmetics Composite video from video source On the keypad press the Source button to select Composite Video Verify that the video automatically synchronizes If it doesn t press the Video button on the keypad Verify there is no distortion noise or...

Page 66: ...r Image 1 Focus Test Image 1 Turn off any local light 2 Turn the zoom ring to make the smallest image 3 Focus the image so the middle icon is clearly focused 4 Focus the image on the 4 green squares 5 After focusing on the green squares on the middle icon turn the zoom ring to make the largest image then repeat the focus tests Verify that all four corner icons have clear resolution Verify that the...

Page 67: ...he Display menu select Factory Reset Verify that the image synchronizes IR in port test Connect a cable between the remote control and the IR in port on the projector Verify that the projector responds to remote commands through the port 12V trigger port test Trigger 2 should read 12VDC whenever the projector is powered on and in 16 9 display mode Power Down After all tests are complete turn the p...

Page 68: ...you through a series of steps that will ultimately result in a solution The solutions begin with the most simple and progress to the most complex What do you want help solving Power problems including lamp issues partial power up shutdown and no power page 69 Image problems including no image bad color dim image and other picture distortions page 77 Keypad problems page 81 Remote problems page 82 ...

Page 69: ... We strongly suggest that you follow the entire power diagnosis sequence page 70 LED Status LED flashes green The projector is starting up after the Power button was pressed or the projector is shutting down after the Power button was pressed LED is solid green The projector is ready to light the lamp when the Power button is pressed Or the lamp is lit and the projector is operating properly LED f...

Page 70: ...ot start and the LED did not light Solve the problem No Red Go to Power Diagnostics part 2 page 71 Go to Error Codes page 72 This is the normal condition LED light green or red Confirm that unit is good by starting again Confirm that unit is good by starting again Solve the problem Yes Yes No Replace keypad ECA page 36 Note A solid green LED means the projector is either waiting for a command or i...

Page 71: ...ssing the Power button twice The lamp does not light Replace keypad ECA page 36 Repeat process to confirm the problem fixed Run the projector long enough to ensure that the problem is solved If the lamp goes out and the LED turns red go to error codes page 72 No The lamp does not light and the LED begins blinking red The lamp attempts to strike five times at 30 second intervals After 2 1 2 minutes...

Page 72: ...s the flashing pattern Red LED flashes have 2 second intervals between series of flashes For example the LED may flash 4 times the pause for 2 seconds the flash 4 times again 5 flashes The projector detects high internal temperature Diagnose thermal problems pag 75 On Off 4 flashes A fan failed Check the fans page 26 On Off On Off 2 flashes The lamp timer registers lamp use of 2000 hours or more R...

Page 73: ...age 37 Yes Ensure that the safety switch cable is connected to the power supply Also ohm out the interlock switch and the thermal switch to make sure they are good If not replace the safety switch assembly page 55 Replace the ballast page 7 Replace controller ECA page 16 Replace power supply page 43 Yes Ensure that the color wheel cable is connected to the controller ECA page 88 Can you hear the s...

Page 74: ...t the lamp won t strike Click here to go to solve failure to strike problems page 73 The top of the lamp module includes three contacts that must align with three matching contacts inside the projector To ensure contact two alignment pins on the lamp engage two holes in the lamp cavity Make sure the pins engage the holes If the lamp is improperly installed the lamp door will probably not seat prop...

Page 75: ...er ECA page 16 Substitute a good power supply and run projector long enough to know if that is the problem page 43 Yes This is a thermal problem If a fan isn t running it causes a power up problem because fans have a sensor line that prevents the projector from properly starting up Is the thermal switch good Replace the safety switch page 55 The problem is almost always a power supply or controlle...

Page 76: ...ce the controller ECA page 16 Reseat color wheel cable page 88 If color wheel still isn t spinning replace the controller ECA page 16 Yes No Does the color wheel start and the lamp light Replace the optical engine page 22 To confirm that the problem is solved restart the diagnosis process page 70 Yes No When you press the Power button you should hear the brief high pitched sound of the color wheel...

Page 77: ... or color Missing logo VGA composite video or S video Distorted image noisy rolling torn frozen plaid repeated or shifted image page 79 Flash the projector with the latest software Confirm that all image adjustments are set to the factory defaults Select Factory Reset from the Settings Service menu Confirm that the cables and the source signals are good If in doubt feed the signal to a good projec...

Page 78: ... MT8 Service Guide 78 No image No image Vertical lines Horizontal lines Sparkly picture Clusters of dark pixels Replace the controller ECA page 16 Is the image correct No Replace the optical engine page 22 ...

Page 79: ...olor Missing startup screen VGA composite video or S video Distorted image excess noise rolling image torn image frozen image plaid image repeated single image or shifted image Make sure cables are good Is the image correct No Replace the controller ECA page 16 ...

Page 80: ...s Substitute a known good controller ECA page 16 Replace the controller ECA page 16 Is the image brighter Yes No Replace the optical engine page 22 The lamp takes about 90 seconds to achieve full brightness No Image won t remain focused Check light tunnel heater voltage on controller ECA page 85 Is correct voltage present No Yes ...

Page 81: ... the projector Make sure you try the remote through at least two lenses If one or more IR receivers do not work go to Remote problems page 82 Keypad does not respond to key presses Does the remote control work No Replace the controller ECA page 16 Yes Replace the keypad ECA page 36 ...

Page 82: ...emote at each of the IR receivers on the projector There are IR receivers on all four sides of the projector Issue a remote command to each receiver Does the projector respond to the command from any of the IR receivers No Replace the controller ECA page 16 Yes Replace the malfunctioning IR receiver s Front IR receiver page 31 Right or left IR receiver or rear IR receiver page 47 ...

Page 83: ...ECA Run the projector with audio for 30 minutes If the problem returns replace both the controller ECA and the top case if the resistance across either speaker coil no longer measures approximately 16 ohms Is there sound Yes No Is there sound from both speakers No only one Replace the controller ECA page 16 Yes Problem solved Make sure the speaker cable is connected to the controller ECA ...

Page 84: ...TDP MT8 Service Guide 84 Block Diagram ...

Page 85: ...TDP MT8 Service Guide 85 Check Controller Voltages To check voltages you need to power up the projector with the top case removed See page 86 for instructions on how to do this ...

Page 86: ... attach the lamp blower contact ECA to the lamp module The lamp blower must receive power for the projector to start Ensure that the contacts align properly 3 Connect the lamp blower contact ECA cable to the controller ECA at J509 4 Use a compatible remote control to power up the projector To do this point the remote at any side of the projector and press Power If you do not have a remote connect ...

Page 87: ...up when you press the power button 6 To verify that a fan or blower is bad unplug the connector for the suspect unit then plug in a known good fan or blower 7 If the lamp blower fails to operate replace the lamp module see page 37 8 If one of the fans fails to operate remove the fan assembly and replace the defective fan see page 26 ...

Page 88: ...eed If you don t hear the sound or if you are not sure you can do a visual check to confirm the color wheel operation If the color wheel is not spinning the first item to check is the color wheel cable connection and reseat it if necessary To check color wheel operation and reseat the cable do the following 1 Power up the projector with the top off see page 86 NOTE The lamp and the lamp door must ...

Page 89: ...uide 89 3 If the color wheel is not spinning check and reseat the color wheel cable connection To reseat the cable open the ZIF connector and pull the cable out Re insert the cable fully and then close the ZIF connector ...

Page 90: ...TDP MT8 Service Guide 90 ...

Page 91: ...own after operating for a few minutes or when the lamp fails to strike after repeated attempts at startup you need to check the thermal switch operation First power up the projector with the top off page 86 Let the projector run until it shuts down Measure the resistance at the switch If the resistance is infinity Ω replace the safety switch assembly which includes the thermal switch Go to remove ...

Page 92: ...TDP MT8 Service Guide 92 Parts Lists Component Parts Exploded View ...

Page 93: ...TDP MT8 Service Guide 93 Case Parts Exploded View ...

Page 94: ...236 xx Controller ECA ECA Controller w IO Shield 510 1778 xx Includes I O shield Elevator Actuator Actuator Elevator 340 0987 xx Elevator Button Button Elevator 340 0986 xx Elevator Shaft S A Elevator Shaft 505 1245 xx Includes elevator foot at end of shaft Elevator Spring Spring Lever 321 0107 xx Fan S A Fan 80x15 526 0121 xx Fan Bracket Bracket Fan 340 0977 xx Fan Mounts Mount Isolation Fan 340 ...

Page 95: ...eflector Reflector Keypad 329 0392 xx Lamp Blower Contact ECA S A Blower Power Cable 526 0128 xx Lamp Blower Contact ECA Bracket Bracket Contact Alignment Upper 330 0915 Lamp Connector Retainer Retainer Connector Ballast TCO 340 1080 xx Lamp Control Cable Cable Lamp Sync 211 0186 xx Lamp Door S A Lamp Door Pearl White 505 1456 xx Lamp Module TLPLMT8 Lens Cap S A Lens Cap 505 1247 xx Leveling Foot ...

Page 96: ...case Security Plate S A Plate Security 505 0429 xx Serial Number Label Label S N Universal Blank 020 0747 xx Top Case 505 1453 xx Includes speakers Requires nameplate Wire Retainer Wire Saddle Locking 321 0205 xx Zoom Ring S A Ring Zoom 505 1243 xx Fastener Kit Contents Fastener Quantity Fastens 4 40 Jack Screws 10 I O shield M3x8 Torx T 10 Plastite 10 Keypad M3x8 Torx T 10 23 Power supply control...

Page 97: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN ...

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