PG-M20S (serv.man10). Electrical adjustment - Sharp Projector Service Manual (repair manual). Page 3

13

Automatic adjust-
ment of video
white balance

1. Feed the 50% gray pattern signal

(NTSC, burst signal).

2. Select the following group and sub-

ject.
Group: DLP
Subjects: V-R1-GAIN  (Red)

V-B1-GAIN  (Blue)

No.

Adjustment Items

Adjustment Conditions

Adjustment Procedures

1. Adjust V-R1-GAIN and V-B1-GAIN so

that x-value should be 265±3 and y-
value should be 298±3.

14

Automatic adjust-
ment of DTV white
balance

1. Feed the 50% gray pattern signal

(480I, color difference signal).

2. Select the following group and sub-

ject.
Group: DLP
Subjects: C-R1-GAIN

C-B1-GAIN

1. Adjust C-R1-GAIN and C-B1-GAIN

so that x-value should be 263±3 and
y-value should be 295±3.

15

Adjustment of
DLP voltage (For
reference)

1. Read voltage rank of DLP descrip-

tion.

2. Set the switch corresponding to the

rank which has been read. (on the
formatter PWB)

1. Carry out adjustment when DLP chip

has been replaced or combination of
chip and formatter has been changed.

2. Rank:

B C D E

Setting  value: 1 2 3 4

16

Confirmation and
re-adjustment of
white balance

1. The adjusting conditions for each

item are as follows:
For RGB input, see Item 11
For SRGB input, see Item 13
For video input, see Item 14
For DVT input, see Item 12

Confirm that there is no deviation in white
balance from that of the monitoring
equipment.
For readjustment, proceed in the order
of RGB input, video input and DTV in-
put.

17

Confirmation of
color-related
operation

1. Receive the color bar signal.

1. Select L1 in the process mode.

Check the performance of color and
tint.

18

Confirmation of
picture-related
operation

1. Receive monoscope pattern signal.

1. Select L2 in the process mode.

Check Picture, Brightness and Sharp-
ness.

19

Confirmation of
RGB

1. Receive the RGB signal.

1. Select L4 on the process mode.

Check Picture, Brightness, Red, Blue,
Clock, Phase, H-POS and V-POS.

20

Confirmation of
off-timer operation

1. Select OFF in the process mode.

Confirm that the off-timer starts with
5-minute display, counts 1 minute for
1 second, and turns off when 0 minute
is displayed.

21

Confirmation of
thermistor opera-
tion

1. Heat the thermistor by dryer.

1. Confirm that the temperature is dis-

played.