21DT1 Colour Television Service Manual Model: C21EF27 (W.EUROPE) Ser Ref No. C21EF27-01 Product Code: 1113 19406 Chassis: EC5-A Original Manual Give complete "SERVICE REF. NO." for parts order or servicing, it is shown on the rating sheet on the cabinet back of the TV set.
SAFETY PRECAUTION 1: An isolation transformer should be connected in the 3: When replacing a chassis in the cabinet, always be cer- power line between the receiver and the AC line when tain that all the protective devices are installed proper- a service is performed on the primary of the converter ly, such as, control knobs, adjustment covers or transformer of the set.
CIRCUIT DESCRIPTION 1. POWER SUPPLY IC201, and output from pin30 (R-Y) and pin31 (B-Y). The power supply circuit of the EC5-A chassis is com- These chroma signals pass through the 1H delay line cir- posed of a rectifier smoothing circuit, an oscillation circuit, cuit (IC271), and they are input to pin29 (R-Y) and pin28 a control circuit and an output rectifier circuit.
ing signal is current amplified by the drive transformer Pin28: GND T431 and drives the output transistor Q432. When Q432 Pin29: - becomes ON, an amplifying current flows directly to DY Pin30: V-deflection stop output(Stop:Lo) through C441/C442 Q432 GND, and defec- Pin31: RGB REF Pin32: Blue output for OSD tion is performed in the last half of the scanning period.
SERVICE CONTROL ADJUSTMENT B1 POWER SUPPLY ADJ. AFT ADJ. TU-AGC ADJ. MAIN BOARD SW1901 SW1902 SW1903 SW1904 SW1905 SW1906 Prog- Level+ Prog+ Level- Function Memory IC801 F601 SW601 Fuse Mains SW R638 IC802 D615 Memory VR631 +B ADJ. Q612 IC001 T611 Audio output Converter...
B1 POWER SUPPLY ADJUSTMENT HIGH VOLTAGE & WIDTH ADJUSTMENT 1. Set VR641 to be mechanical centre before pressing [HIGH VOLTAGE ADJUSTMENT] the main switch. 1. Tune the receiver to circular pattern. 2. Tune the receiver to PAL circular pattern. 2. Set brightness and contrast controls to maximum. 3.
CIRCUIT ALIGNMENT 10kΩ 0.002µF 75Ω 1kΩ Output probe Input probe VIF alignment Adjustment SETTING Waveform DC 15.5V C644 + By using T141, adjust "P" to AGC voltage (4.3-4.5V) IC201-pin48 be maximum amplitude. Output probe IC201-pin45 (Side b) Input probe IC201-pin7 Marker frequency 38.9MHz Sweep ATT...
MEMORY IC REPLACEMENT (Important Notice) When you replace a memory IC (IC802), it is neces- sary to initialise the IC as follows. A. Initialisation of Memory IC 1. When you press and hold the Recall button on the RC transmitter and then press the Prog + button on the TV set, the following picture will appear on the screen.
Special Function Special Function Maximum volume setting and prohibition of presetting Start up programme position This TV set allows you to set up the following special functions. Maximum volume setting and prohibition of presetting ITEM-1 Sets the current volume as the maximum volume level and ITEM-1 SET 0 prohibition of presetting.
Note: Parts order must contain Service Ref. No., Part No., and descriptions. Ref. No. Part No. Description Ref. No. Part No. Description SERVICE REF. No. C21EF27-01 Read description in the Capacitor and Resistor as follows: CAPACITOR OUT OF CIRCUIT BOARD CERAMIC 100P K 50V Rated Voltage PICTURE TUBE...
Printed in the U.K. Sanyo Industries [U.K.] Ltd.
21DT1 cance to product safety. It is particu- MODEL NUMBER (C21EF27) signal strength. ore sono con tutti i controlli alle loro Il transistore 2SA608(E,F) puo essere mento del TV. larly recommended that only parts 7.