Before calling service personal

Check the following points before asking for support service. Refer also to “Trouble indications”. 60

CONTENTS

66

Symptom

Cause

Correction

Page

The power does not come on.

• The power cord is disconnected.

Firmly plug in the power cord.

 

19

 

 

• The lamp cover is not attached correctly.

Attach the cover correctly.

 

65

 

The power turns off while

• The ambient temperature of the projection room is too high.

Lower the ambient temperature of the projection room,

 

60

 

using the projector.

 

and turn the power on.

 

 

 

No image appears.

• The lens cover is on.

Take off the lens cover.

 

19

 

 

• The wrong input is selected.

Select the input source correctly.

 

29

 

 

• The muting mode is on.

Press MUTE to restore the picture.

 

35

 

 

• The “Brightness” adjustment is at its darkest.

Make the “Brightness” adjustment.

 

44

 

 

• The source is not correctly connected to the projector.

Connect the source correctly to the projector.

23

-

25

No sound is heard.

• The wrong input is selected.

Select the input source correctly.

 

29

 

 

• The muting mode is on.

Press MUTE to restore the sound.

 

35

 

 

• The sound volume is at it’s minimum.

Adjust the sound volume.

 

31

 

 

• The source is not correctly connected to the projector.

Connect the source correctly to the projector.

23

-

25

Desired input source cannot

• Input is not set so that it can be selected with the INPUT button. By

Set from the menu screen so that the source can be

 

44

 

be selected by the INPUT

default, only the Analog RGB and Video input modes can be selected.

selected with the INPUT button.

 

29

 

button.

 

 

 

 

 

Analog RGB input or Y/PB/PR

• The COMPUTER connector's input setting is wrong.

On the menu screen, set for the proper input signal type.

 

44

 

input colors are not right.

 

 

 

 

 

 

 

 

 

 

 

The image is blurred.

• The lens is dirty.

Clean the lens with a blower or lens cleaner, etc.

 

63

 

Focusing is uneven.

• The picture is out of focus.

Focus the picture.

 

30

 

 

 

 

 

 

 

 

• The projection distance is not appropriate.

Adjust the distance properly.

 

18

 

 

• The projecting light is not hitting the screen squarely.

Adjust the projecting direction so that the light hits the

 

18

 

 

 

screen squarely.

 

 

 

 

• The “Brightness”, “Contrast”, “Sharpness” or “Phase” adjustments

Make the “Picture” adjustments.

 

45

 

 

are not correct.

 

 

 

 

The picture is dim.

• The “Brightness” or “Contrast” adjustments are not correct.

Make the “Picture” adjustments.

 

45

 

 

 

 

 

 

 

 

• The lamp life is ending.

Replace the lamp.

 

64

 

The color is faint.

• The “Color”, “Tint”, “R-Level”, “G-Level” or “B-Level” adjustments

Make the “Color” adjustments.

 

47

 

The tint is not good.

are not correct.

 

 

 

 

 

• The lamp life is ending.

Replace the lamp.

 

64

 

Others

Continued

Page 66
Image 66
Toshiba TLP551, 251, 250, TLP550 owner manual Before calling service personal, Symptom Cause Correction

251, TLP550, TLP551, 250 specifications

Toshiba has long been recognized for its innovation in the field of semiconductor technology, particularly in the area of optoelectronic devices. Among its extensive portfolio, the Toshiba TLP series stands out, especially models such as the TLP250, TLP551, TLP550, and TLP251. These optoisolators are designed to provide exceptional performance in various applications, including industrial controls, communication equipment, and power supplies.

The TLP250 is a high-speed transistor optoisolator that boasts a maximum data transmission rate of up to 10 Mbps. It is designed for applications where precise isolation between input and output is critical. The device employs a GaAlAs light-emitting diode, ensuring a fast response time and efficient operation. Its package includes a phototransistor, which enables it to switch high voltages and currents, making it ideal for driving loads in various circuits.

In contrast, the TLP551 offers a higher level of phototransistor isolation with a breakdown voltage of up to 5 kV. This model is well-suited for environments where electrical noise is a concern, as it provides reliable and stable isolation. With a maximum forward current of 50 mA, the TLP551 ensures that even in complex industrial settings, signal integrity can be maintained effectively.

The TLP550 is another noteworthy optoisolator, characterized by its compact size and robust performance. It also integrates a phototransistor output, which allows for a high degree of flexibility in design. This model is engineered to deliver a maximum isolation voltage of 3.75 kV, making it suitable for various high-voltage applications.

Finally, the TLP251 offers a unique combination of features tailored for demanding applications. With its high-speed response and excellent voltage gain, it is particularly advantageous in communication systems. Its ability to provide isolation while transferring data makes it an essential component for many digital interfaces.

In summary, the Toshiba TLP series, including models like the TLP250, TLP551, TLP550, and TLP251, exemplify the brand's commitment to quality and innovation in optoelectronic devices. These models are engineered to meet the rigorous demands of modern applications, offering features such as high-speed operation, significant isolation voltage ratings, and versatile output options. For engineers and designers, choosing the right Toshiba optoisolator can significantly enhance the reliability and efficiency of their electronic systems.