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Colour Television Service Manual Model CE28DF1-C (W.EUROPE) Service Ref. No. CE28DF1-C-00 PRODUCT CODE Specifications 111327213 Power source AC 220~240V 50Hz ORIGINAL VERSION Television system System B/G, I,L/L’ Chassis No. EB3-A Colour system PAL/SECAM Receiving channel VHF: E2~E12 CATV: X,Y,Z, S1~S41 Give complete "SERVICE REF.
SAFETY PRECAUTION When replacing a chassis in the cabinet, always be An isolation transformer should be connected in the certain that all the protective devices are installed power line between the receiver and the AC line when properly, such as, control knobs, adjustment covers a service is performed on the primary of the converter or shields, barriers, isolation resistor-capacitor transformer of the set.
CIRCUIT DESCRIPTION 1.POWER SUPPLY control) The chroma signal is divided into R-Y and B-Y The power supply circuit of the EB3-A chassis is chroma signals, demodulated in IC101, and output from composed of a rectifier smoothing circuit, an oscillation pin30 (R-Y) and pin31 (B-Y). These chroma signals pass circuit, a control circuit and an output rectifier circuit.
6.HORIZONTAL OUTPUT Pin34: TEXT/16:9 SELECT OPTION A horizontal oscillation signal is output from pin37 of Pin35: Key scan 1 IC101 and switches the drive transistor Q431. This Pin36: P-ON(TEXT) switching signal is current amplified by the drive Pin37: S-VHS output transformer T431 and drives the output transistor Q432.
SERVICE CONTROL ADJUSTMENT B1 POWER SUPPLY ADJ. AFT ADJ. TU-AGC ADJ. MAIN BOARD SW701 SW702 SW703 SW704 SW701A SW705 SW301 Q731 K803 Q381 K171 IC701 Q784 Q783 Q781 T381 Q771 IC790 IC301 Q761 POWER Q313 D332 Q762 Q353 Power TP-B SW220 MEMORY D331...
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B1 POWER SUPPLY ADJUSTMENT V-CENTRE ADJUSTMENT 1. Set VR351 to be mechanical centre before pressing the main 1. Tune the receiver to circular pattern. switch. 2. Adjust V-centre by using SW451. 2. Tune the receiver to PAL circular pattern. 3. Set brightness and contrast controls to normal. 4.
CIRCUIT ALIGNMENT VIF ALIGNMENT 10kΩ 0.01uF 0.002µF 75Ω 1kΩ Output probe Tool-A Input probe DETECTOR Note: DETECTOR ADJUSTMENT - 1 How to select SYSTEM ADJUSTMENT - 2 L or L’ DC 15V IC351-pin 1 IC351-pin 1 1. Before switching on DC 5V Q381-Emitter Q381-Emitter...
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MEMORY IC REPLACEMENT (Important Notice) AV3 IN SYS. MENU VIDEO L/S-AUDIO-R/D Level Button Function Button When you replace a memory IC (IC731), it is necessary to initialise the IC as follows. A. Initialisation of Memory IC 16:9 1. When you press and hold the Function button on the TV set and then press the Recall button on the RC /MENU transmitter, the following picture will appear on the screen.
CHASSIS ELECTRICAL PARTS LIST Product safety should be considered when a component replacement is made in any area of a receiver. Components indicated by a mark in this parts list and the circuit diagram show components whose value have special significance to product safety. It is particularly recommended that only parts specified on the following parts list be used for components replacement pointed out by the mark.