DOWNLOAD Sharp 21LF-90H (serv.man3) Service Manual ↓ Size: 1.51 MB | Pages: 44 in PDF or view online for FREE

Wide temperature range
Excellent power supply ripple rejection
Low power consumption
Short-circuit resistant
High performance
high signal-to-noise ratio
low distortion

1. Output A (Voltage swing): Min: 0.75 V, Max: 4.25 V
2. Inverting input A: Vo (clip): Min: 1400 mVrms
3. Non-inverting input A: 2.5 V
4. Ground: 0 V
5. Non-inverting input B: 2.5 V
6. Inverting input B: Vo (clip): Min: 1400 mVrms
7. Output B (Voltage swing): Min: 0.75 V, Max: 4.25 V
8. Positive supply: 5 V, Min: 3.0 V, Max: 7.0 V

  

  

VIDEO 

AUDIO 

PAL BG 

G1975M 

 

PSBG DK 

K2966M 

 

PAL II' 

J1981 

 

PSBGDKK' II' 

K2966M   

 
 

MONO 

PSBGDKK' LL' 

K2962M 

L9653 

 

  

VIDEO 

AUDIO 

PAL BG 

G3967M 

G9353M 

PAL II' 

K3958M 

K9356 

PSBGDKK' II' 

K3958M 

K9356 

 
 

STR 

PSBGDKK' LL' 

K3958M 

K9656 

 

1. Input
2. Input-ground
3. Chip carrier-ground
4. Output
5. Output

1. Input
2. Switching Input
3. Chip carrier-ground
4. Output
5. Output

MONO

All system, geometry and white balance alignments are performed in Service Mode. Before starting the service
mode alignments, make sure that all manual adjustments are done correctly.

To enter the service mode:
1. Press the MENU (30) button  on the remote control gun. See figure 5.
2. Press digit keys 4, 7, 2 and 5 consecutively.

When the Service Mode is entered the following On Screen Display appears (figure 4):

                    

To adjust the different registers:
1. Use the CURSOR UP (2) / DOWN (31) buttons to move between the registers. See the above right figure.
2. Use the CURSOR LEFT (32) / RIGHT (3) buttons to change the data. See figure 5.

To memorize the adjustment:
It is not required to memorize the adjustment. Data are stored automatically.

To exit the Service Mode:
Switch the TV off using the mains switch.

A51EFS13X191 A51ELD032X001 

OSD Horizontal Position 

 

70 

81 

IF Coarse Adjust 

 

X 

X 

IF Fine Adjust 

 

X 

X 

IF Coarse Adjust for L-Prime 

 

X 

X 

IF Fine Adjust for L-Prime 

 

X 

X 

Automatic Gain Control 

 

X 

X 

Vertical Linearity 

 

37 

10 

RGB Horizontal Shift Offset 

CVBS – RGB Horizontal 

position compensation 

8 7 

Vertical Size Offset for 60 Hz 

 

-30 

-32 

Vertical Position Offset for 60 Hz 

 

2 

1 

Horizontal Size Offset for 60 Hz 

 

-22 

-22 

Horizontal Position Offset for 60 Hz 

 

-18 

-18 

Horizontal Trap Correction Offset for 60 Hz 

 -19 -20 

White Point Adjust for RED 

 

49 

42 

White Point Adjust for GREEN 

 

45 

41 

White Point Adjust for BLUE 

 

42 

42 

Bias for RED 

 

31 

31 

Bias for GREEN 

 

31 

31 

A51EFS13X191 A51ELD032X001 

APR Threshold 

 

10 

4 

Factory Setting Brightness  

 

31 

31 

Factory Setting Contrast 

 

49 

49 

Factory Setting Colour 

 

26 

26 

Factory Setting Sharpness 

 

6 

6 

Factory Setting Hue 

 

31 

31 

Factory Setting Volume 

 

9 

9 

White Point Adjust for Red (RGB mode) 

 

48 

30 

White Point Adjust for Green (RGB 

mode) 

 53  40 

White Point Adjust for Blue (RGB mode) 

 

37 

40 

FM Prescaler when AVL is OFF 

STEREO ONLY 

11 

11 

NICAM Prescaler when AVL is OFF 

STEREO ONLY 

25 

25 

SCART Prescaler when AVL is OFF 

 

11 

11 

SCART Prescaler when AVL is OFF for 

SECAM L/L’ MONO 

 11  11 

FM Prescaler when AVL is ON 

 

16 

16 

NICAM Prescaler when AVL is ON 

STEREO ONLY 

37 

37 

SCART Prescaler when AVL is ON 

STEREO ONLY 

17 

17 

SCART Prescaler when AVL is ON for 

SECAM L/L’ MONO 

 17  17 

High Byte of crossover frequency for 

VHF1-VHF3 

Meaningful for only PLL 

Tuner 

 See “15.1 Service Registers 
Updating regarding the Tuner”  
on Page 27. 

Low Byte of crossover frequency for 

VHF1-VHF3 

Meaningful for only PLL 

Tuner 

See “15.1 Service Registers Updating 
regarding the Tuner”  
on Page 27. 

High Byte of crossover frequency for 

VHF3-UHF 

Meaningful for only PLL 

Tuner 

See “15.1 Service Registers Updating 
regarding the Tuner”  
on Page 27. 

Low Byte of crossover frequency for 

VHF3-UHF 

Meaningful for only PLL 

Tuner 

See “15.1 Service Registers Updating 
regarding the Tuner”  
on Page 27. 

Band Switch Byte for VHF1 

Meaningful for only PLL 

Tuner 

See “15.1 Service Registers Updating 
regarding the Tuner”  
on Page 27. 

Band Switch Byte for VHF3 

Meaningful for only PLL 

Tuner 

See “15.1 Service Registers Updating 
regarding the Tuner”  

  on Page 27. 

Band Switch Byte for UHF 

Meaningful for only PLL 

Tuner 

See “15.1 Service Registers Updating 
regarding the Tuner”  

  on Page 27. 

Control Byte 

Meaningful for only PLL 

Tuner 

See “15.1 Service Registers Updating 
regarding the Tuner”  
on Page 27. 

Option 1 (see the Option List) 

 

x 

x 

Option 2 (see the Option List) 

 

x 

x 

Option 3 (see the Option List) 

 

x 

x 

Option 4 (see the Option List) 

 

x 

x 

Option 5 (see the Option List) 

 

x 

x 

Teletext Option 1 (see the Option List) 

 

x 

x 

Geometry Menu 

 

See Geometry Table on Page 25. 

Not used 

 

x 

x