DOWNLOAD Sharp PG-M20X Service Manual ↓ Size: 696.94 KB | Pages: 42 in PDF or view online for FREE

25

26

27

Lamp

Light source. DC-driven high-pressure mercury vapour lamp.

UV/IR filter

Used to absorb ultraviolet and infrared rays.

Colour wheel

Used to let the source light through the colour filter and to separate it into
R, G and B colours.

Rod lens

Used to make for uniform light beams.

Relay lenses

Used to collect the light from the rod lens into the DMD
chip.

Reflector

Used to reflect the light from the relay lenses against the
DMD chip.

Prism

Used to introduce the light from the reflector over the effective surface of
the DMD chip. When the micromirror gets tilted (ON) as specified, the
reflected light is guided to the projection lens.

DMD chip

Used to turn on and off the micromirror in response to the ratio of colour
components at each dot and thus to reflect the incoming light
accordingly.

Projection lens

Used to enlarge the light from the DMD chip and to get the light
projected on the screen.

To repair this set without top cabinet, attach the left side body beforehand. (Since the exhaust
heat gets in around the set and the temperature sensor detects it giving the TEMP error and
the lamp goes off.)

28

No.

Adjustment Items

Adjustment Conditions

Adjustment Procedures

1

Initialisation of EEPROM

1. Turn on the power (the lamp lights
up) and warm up the system for 15
minutes.

1. Make the following settings.
Press S2002 to call the process mode and
execute "SS2" on SS menu.

2

Adjustment of CW index

1. Signal input: 64-step colour bar
2. Select the following group and
subject.
Group: DLP
Subject: Select CW-INDEX.

1. Feed the signal to INPUT 1.
2. Select subject and make adjustment so
that the lamp gradation patterns of R, G and
B should be smooth without noise.

3

Adjustment of RGB
gradation reproduction

1. Feed the SMPTE pattern signal.
2. Select the following group and
subject.
Group: DLP
Subject: G1-GAIN

1. Confirm that 100% and 95% white
gradation and 0% and 5% black gradation
are discernible.
2. If the white gradation looks differently, do
fine adjustment by G1-GAIN.

4

Adjustment of video
brightness/contrast

1. Feed the NTSC100% window
patter signal. (Burst signal)
2. Select the following group and
subject.
Group: VIDEO
Subject: AUTO

1. After signal input, select AUTO using the
set's switch or the remote controller's button
for automatic adjustment.

5

Adjustment of video tint

1. Feed the split colour bar signal.
2. Select the following group and
subject.
Group: VIDEO
Subject: TINT

1. Confirm the fixed value.
Fixed value: 128

6

Adjustment of NTSC colour
saturation

1. Feed the internal 8ch (split colour
bar) signal.

1. Confirm the fixed value.
Fixed value: 59