Dell 21N21E2 MICON/TUNER, IF/CHROMA

WAVEFORMS

MICON/TUNER

IF/CHROMA

5 10

6 11

The following waveforms were measured at the point of the corresponding

balloon number in the schematic diagram.

NOTE:

0.5µs

10ms

20µs

50µs

100mV

0.2ms

50µs

0.5V

50µs

100mV

50µs

100mV

20µs

0.5V

20µs

2ms

200mV

H-1

Contents

Main SERVICING NOTICES ON CHECKING 6. AVOID AN X-RAY1. KEEP THE NOTICES IMPORTANT 3. USE THE DESIGNATED PARTS 5. TAKE CARE TO DEAL WITH THE CATHODE-RAY TUBE CONTENTS A2-1 A3-1 A3-2 A3-3 A3-4 A3-5 1. REMOVAL OF ANODE CAP 2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC Page SERVICE MODE LIST WHEN REPLACING EEPROM (MEMORY) IC CONFIRMATION OF HOURS USED 2. BASIC ADJUSTMENTS 1. ADJUSTMENT PROCEDURE Page Page 3. PURITY AND CONVERGENCE ADJUSTMENTS D-5 ELECTRICAL ADJUSTMENTS CP803A MAIN PCB 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) R805 R803 BLOCK DIAGRAM E-1 E-2 R402 CP803A C535_1 PRINTED CIRCUIT BOARDS MAIN/CRT (INSERTED PARTS) SOLDER SIDE F-1 F-2 PRINTED CIRCUIT BOARDS MAIN/CRT (CHIP MOUNTED PARTS) SOLDER SIDE F-3 F-4 MICON/TUNER SCHEMATIC DIAGRAM G-2 G-1 IF/CHROMA SCHEMATIC DIAGRAM G-4 G-3 21PIN/AV SW SCHEMATIC DIAGRAM G-6 G-5 CAUTION: DIGITAL TRANSISTOR SOUND AMP SCHEMATIC DIAGRAM G-8 G-7 :SINCE THESE PARTS MARKED BY 10 DEFLECTION/CRT SCHEMATIC DIAGRAM NOTE:THE RESISTOR MARKED F IS FUSE RESISTOR. IS NON POLAR ONE. G-10 0 G-9 POWER SCHEMATIC DIAGRAM 3A 125V 4A 250V 4A 250V3A 125V G-11 MICON/TUNER IF/CHROMA 21PIN/AV SW DEFLECTION/CRT SOUND AMP MECHANICAL EXPLODED VIEW MECHANICAL REPLACEMENT PARTS LIST Location No. TSB P/N Part No. Description J1-1 J2-1 Location No. TSB P/N Part No. Description J2-2 J2-3 Location No. TSB P/N Part No. Description J2-4 Location No. TSB P/N Part No. Description J2-5 DIODES Location No. TSB P/N Part No. Description ICS J2-6 TRANSISTORS COILS &TRANSFORMERS JACKS SWITCHES J2-7 VARIABLE RESISTORS P.C.BOARD ASSEMBLIES MISCELLANEOUS