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Sharp 21BM2G User Manual

Sharp 21BM2G
40 pages
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1
14BM2, 14BM2S/G
20BM2, 20BM2S/G
21BM2, 21BM2S/G
SERVICE MANUAL
14BM2, 14BM2S/G
20BM2, 20BM2S/G
21BM2, 21BM2S/G
MODELS
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored
to its original condition and only parts identical to those specified should be used.
Ë
Multi 18 Systems
Ë
Full Auto Channel Preset and Auto Channel Skip
Ë
100-CH Program Memory
Ë
High Contrast Picture
Ë
Black Stretch Circuit
Ë
CATV (Hyper Band) Ready
Used Frequency Synthesizer Tuner
Ë
Hotel Mode
Ë
On Timer/Sleep Timer/Reminder Timer
Ë
Colour Comb Filter Function (NTSC only)
Ë
Blue Back Noise Mute
Ë
Front AV-In & Rear AV-In/Out Terminals
Ë
AVL Function
Ë
English/Chinese/Malay/France/Russia/Arabic OSD
» SPECIFICATIONS ........................................... 2
» IMPORTANT SERVICE NOTES ...................... 2
» ADJUSTMENT PRECAUTIONS ..................... 3
» HOTEL MODE APPLICATION NOTE............ 15
» TROUBLE SHOOTING TABLE......................15
» SOLID STATE DEVICE BASE DIAGRAM ..... 18
» CHASSIS LAYOUT ........................................19
» BLOCK DIAGRAM.........................................22
» WAVEFORMS ...............................................25
» DESCRIPTION OF SCHEMATIC DIAGRAM .. 27
» SCHEMATIC DIAGRAM
MAIN UNIT ............................................... 28
CRT UNIT................................................. 34
» PRINTED WIRING BOARD ASSEMBLIES ... 36
» REPLACEMENT PARTS LIST
ELECTRICAL PARTS ............................... 41
MISCELLANEOUS PARTS ...................... 46
SUPPLIED ACCESSORIES..................... 46
PACKING PARTS ..................................... 46
CABINET PARTS .....................................46
Page
Page
CONTENTS
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and power
receptacle, when servicing this chassis. To prevent electric shock, do not remove cover. No user – serviceable
parts inside. Refer servicing to qualified service personnel.
SHARP CORPORATION
WARNING
COLOUR TELEVISION
Chassis No. UA-1
S00K414BM2S//
14BM2, 14BM2S/G
20BM2, 20BM2S/G
21BM2, 21BM2S/G
FEATURE
SERVICE MANUAL
COLOUR TELEVISION
MODELS 14BM2, 14BM2S/G, 20BM2, 20BM2S/G, 21BM2, 21BM2S/G
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Sharp 21BM2G Specifications

General IconGeneral
BrandSharp
Model21BM2G
CategoryTV
LanguageEnglish

Summary

Feature List

Safety Warning

Specifications

Important Service Notes

Servicing High Voltage System and Picture Tube

Procedures for servicing the high voltage system and picture tube.

X-Ray Radiation Precautions

Precautions regarding potential X-ray radiation during servicing.

Pre-Return Receiver Safety Checks

Safety checks to perform before returning the receiver to the user.

Adjustment Precautions

Service Mode Operations

AGC & Geometric Mode

Adjustment mode for AGC and geometric settings.

White Point Adjustment Mode

Adjustment mode for white point settings.

Miscellaneous Option Mode

Access to miscellaneous adjustment options.

IC Option Mode

Integrated circuit option adjustments.

Sub Adjustment Mode

Sub-adjustment mode for various parameters.

Y-Delay Adjustment Mode

Adjustment mode for Y-delay settings.

Offset Adjustment Mode

Adjustment mode for offset settings.

User Data in Service Mode

Direct Key-in Step1 Mode

Method for controlling service mode functions via remote.

Initial Setting

Shipping Setting and Checking

Factory Settings by Models

Default factory settings for different models.

PIF Adjustment

Purity Adjustment

Convergence Adjustment

Static Convergence

Initial alignment of convergence magnets.

Dynamic Convergence

Fine-tuning convergence across the screen.

CRT Cut-off, Background and Sub-Contrast Adjustment

Horizontal, Vertical, Deflection Loop and Focus Adjustment

V-Slope Adjustment

Adjusting the vertical slope of the picture.

V-Shift-50 Adjustment

Adjusting the vertical position of the picture.

V-Amp 50 Adjustment

Adjusting the vertical picture amplification.

S-Correction Adjustment

Adjusting picture pincushion distortion.

H-Shift (50) Adjustment

Adjusting the horizontal position of the picture.

Focus Adjustment

Adjusting the picture focus.

NTSC Chroma Adjustment

Sub-Colour Adjustment

Sub-adjustment for colour saturation in NTSC.

Sub-Tint Adjustment

Sub-adjustment for colour hue in NTSC.

PAL Chroma Adjustment

Sub Colour Adjustment (PAL)

Sub-adjustment for colour saturation in PAL.

Protector Operation Checking

Beam Protector Check

Checking the beam protection circuit.

H.V. Protector Check

Checking the high voltage protection circuit.

Other Protector Check

Checking other protective circuits.

A/V Input and Output Checking

Video and Audio Output Check

Checking video and audio output signals.

Video and Audio Input Check

Checking video and audio input signals.

Function Operation Checking (Video and Audio)

Contrast Key Check

Checking the contrast adjustment.

Colour Key Check

Checking the colour adjustment.

Brightness Key Check

Checking the brightness adjustment.

Tint Key Check

Checking the tint adjustment.

Sharpness Key Check

Checking the sharpness adjustment.

CH Display Colour Check

Checking the channel display colour.

Normal Key Function

Checking the normal mode reset function.

White Temperature Check

Checking the white temperature adjustment.

Colour System Check

Checking colour system settings (PAL/SECAM/NTSC).

Sound System Check

Checking sound system settings (B/G, D/K, I).

Noise Mute Checking

Checking the noise mute function.

OSD Language Quantity Check

Checking OSD language options available.

Memory Map

UA1 Hotel Mode Application Note

Trouble Shooting Table

No Raster Troubleshooting

Troubleshooting steps for when there is no picture.

Trouble Shooting Table (Continued)

No Picture, No Sound Troubleshooting

Troubleshooting for missing picture and sound.

No Sound Troubleshooting

Troubleshooting for missing sound.

No Vertical or Horizontal Synchronization

Troubleshooting synchronization issues.

Defective Vertical Amp & Linearity

Troubleshooting vertical display problems.

No Vertical Scan Troubleshooting

Troubleshooting for lack of vertical scanning.

Trouble Shooting Table (Continued)

No Specific Colour Troubleshooting

Troubleshooting for incorrect or missing colours.

No Specification Colour (PAL/SECAM)

Troubleshooting colour sync for PAL/SECAM.

Solid State Device Base Diagram

Top View Diagrams

Component diagrams viewed from the top.

Side View Diagrams

Component diagrams viewed from the side.

Chassis Layout: 14BM2S/G

Chassis Layout: 20BM2S/G

Chassis Layout: 21BM2S/G

Main Unit Block Diagram

CRT Unit Block Diagram: 14BM2S/G

CRT Unit Block Diagram: 20BM2S/G/21BM2S/G

Waveforms

Description of Schematic Diagram

Safety Notes

General safety precautions for servicing.

Important Safety Notice

Crucial safety information for part replacement.

Service Precaution

Precautions for servicing areas connected to mains voltage.

Notes on Schematics

General notes on schematic conventions.

Voltage Measurement Conditions

Conditions for taking voltage measurements.

Waveform Measurement Conditions

Conditions for measuring waveforms.

Printed Wiring Board Assemblies

Replacement Parts List

Parts Replacement Information

General information on replacing parts.

How to Order Replacement Parts

Procedure for ordering replacement parts.

Picture Tube Replacement Parts

List of replacement picture tubes.

Transistor Replacement Parts

List of replacement transistors.

Diode Replacement Parts

List of replacement diodes.

Replacement Parts List

Transformer Replacement Parts

List of replacement transformers.

Capacitor Replacement Parts

List of replacement capacitors.

Coil Replacement Parts

List of replacement coils.

Replacement Parts List

Capacitor Replacement Parts

List of replacement capacitors.

Resistor Replacement Parts

List of replacement resistors.

Replacement Parts List

Resistor Replacement Parts

List of replacement resistors.

Balun Replacement Parts

List of replacement baluns.

Switch Replacement Parts

List of replacement switches.

Miscellaneous Replacement Parts

List of miscellaneous replacement parts.

Replacement Parts List

Resistor Replacement Parts

List of replacement resistors.

Miscellaneous Replacement Parts

List of miscellaneous replacement parts.

Transistor Replacement Parts

List of replacement transistors.

Diode Replacement Parts

List of replacement diodes.

Replacement Parts List

Capacitor Replacement Parts

List of replacement capacitors.

Resistor Replacement Parts

List of replacement resistors.

Miscellaneous Replacement Parts

List of miscellaneous replacement parts.

Supplied Accessories

Accessories

Standard accessories included with the product.

Accessory (Not Replacement Item)

Non-replaceable accessories.

Packing Parts

Cabinet Parts

Cabinet Parts

14BM2S/G Cabinet Parts

Cabinet parts for the 14BM2S/G model.

21BM2S/G Cabinet Parts

Cabinet parts for the 21BM2S/G model.

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