Sanyo C21LB25S User Manual

SERVICE MANUAL Colour Television
Product Code: 1 113 549 04 (C21LB25S)
1 113 550 04 (C29LK35)
Original Version
Chassis Series: LA4-A
C4BE/C4BES/C4CE
FILE NO.
Model No. C21LB25S
C29LK35
Service Ref. No. C21LB25S-00
C21LB25S-01
C29LK35-00
(Argentina)
Give complete “SERVICE REF. NO.” for parts
order or servicing. It is shown on the rating
plate at the cabinet back of the unit.
This T.V. receiver will not work properly in
foreign countries where the television trans-
mission system and power source differ from
the design specifications. Refer to the specifi-
cation table.
VIDEO
MODE
AUDIO
MODE
POWER
0
7
1
4
8
5
2
3
6
9
▲CH▼
+VOL
RECALL
MENU
IMAGE
SLEEP
DISPLAY
MUTE
FXMR
VOL-
Specifications
Power Source . . . . . . . . .AC110V-240V, 50Hz / 60Hz
Receiving System . . . . . .PAL (M/M, N/N), NTSC (M/M)
Channel Coverage
Antenna mode VHF: CH02-CH13, UHF: CH14-CH69
CATV mode VHF band: CH01-CH13, Mid band: CH14-CH22
Super band: CH23-CH36, Hyper band: CH37-CH64
Ultra band: CH65-CH94 and CH100-CH125
Low mid band: CH95-CH99
Video IF . . . . . . . . . . . . .45.75MHz
Aerial Input Impedance . .75Ω
Ext. Terminals
Video inputs: Phono jack ✕ 2 (1Vp - p, 75Ω)
Audio inputs: Phono jack (R/L) ✕ 2 (436mVrms, more than 40KΩ)
Headphone Jack: Mini stereo jack ✕ 1
Sound Output (RMS) . . . .3W + 3W
Speakers . . . . . . . . . . .5cm x 9cm x 2
Dimensions . . . . . . . . .C21LB25S: 606(W) ✕ 479(H) ✕ 483(D)mm
C29LK35: 656(W) ✕ 600(H) ✕ 496(D)mm
Weight . . . . . . . . . . . . .C21LB25S: approx. 21.0 Kg
C29LK35: approx. 32.0 Kg
Specifications subject to change without notice.
MENU
▼ CH ▲
-
VOLUME
+
VIDEO
L-AUDIO-R
MENU
▼ CH ▲
-
VOLUME
+
VIDEO
L-AUDIO-R
REFERENCE NO. SM5110159

Sanyo C21LB25S Specifications

General

Screen Size	21 inches
Display Technology	CRT
Display Type	Color
Aspect Ratio	4:3
Sound Output	Mono
Input Ports	RF, Composite

Summary

Safety Notices and Precautions

General Safety Precautions

Essential safety advice for operating and servicing the television receiver.

X-Radiation Safety

Guidance to prevent hazardous X-radiation emissions from the picture tube.

Product Safety Component Notice

Recommendation to use specified parts for safety-critical components.

Chassis Block Diagrams

Main Signal Processing Circuit Diagram

Block diagram illustrating the primary signal flow within the TV chassis.

System Control Circuit Diagram

Block diagram detailing the system control operations and interconnections.

Integrated Circuit (IC) Block Diagrams

IC201 IF/Video/Chroma/Def. Diagram

Block diagram for IC201, covering IF, video, chroma, and deflection functions.

IC001 Audio Amplifier Diagram

Block diagram for the IC001 audio amplifier (LA4600).

IC501 Vertical Output Diagram

Block diagram for the IC501 vertical output stage (LA7841).

IC611 Switching Regulators Diagram

Block diagram for the IC611 switching regulators (QXXAVB325).

IC3401 MTS Decoder Diagram

Block diagram for IC3401, detailing MTS decoding and audio control.

Memory IC Service Adjustments

Initializing Procedure

Step-by-step guide for initializing the memory IC after replacement.

Service Adjustments - Part 1

Details initial values and items for service adjustments, covering items 01-27.

Entering Service Mode

Instructions on accessing the service mode via remote control.

Specific Adjustments - General (1)

Detailed procedures for adjustments like Horizontal Centre, Vertical Centre, AGC, and AFT.

Specific Adjustments - General (2)

Procedure for adjusting grey scale tracking and white balance for optimal picture.

Service Adjustments - Part 2 (MTS)

Details initial values and procedures for MTS adjustment settings.

Specific MTS Adjustments (1)

Procedures for adjusting sound level and stereo VCO frequency in MTS mode.

Specific MTS Adjustments (2)

Procedures for adjusting MTS filter and stereo separation for audio.

Specific MTS Adjustments (3)

Procedures for adjusting HI separation and SAP VCO frequency for MTS.

Service Adjustment - Fine Tuning

Procedure for fine-tuning channels with poor reception using the remote control.

General Service Adjustments

Focus Adjustment

Procedure to adjust the focus control on the F.B.T. for optimal picture focus.

Horizontal Width & High Voltage Check

Procedure for checking and adjusting horizontal width and high voltage levels.

Protection Circuit & Restoration

Explanation of the power supply protection circuit and power restoration.

Purity and Convergence Adjustment

Purity Adjustment

Steps for adjusting picture purity using deflection yoke and magnet assemblies.

Centre Convergence Adjustment

Procedure for converging picture elements in the centre screen area.

Outer Area Convergence Adjustment

Procedure for converging picture elements in the outer screen areas.

Cabinet Parts List

Chassis Electrical Parts List