CE21DN3-C Colour Television Service Manual Chassis: EB4-A (MKII) Service Ref.No.: CE21DN3-C-04 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. Note This TV receiver will not work properly in foreign countries where the television transmission system and power source differ from the design specifications.
SAFETY PRECAUTION 1: An isolation transformer should be connected in the 3: When replacing a chassis in the cabinet, always be power line between the receiver and the AC line certain that all the protective devices are installed when a service is performed on the primary of the properly, such as, control knobs, adjustment covers converter transformer of the set.
BLOCK DIAGRAM This is a diagram for all models and therefore differs slightly from the actual block diagram. Audio Audio Unit SIF Unit EB4 MKII chassis...
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CIRCUIT DESCRIPTION 1. POWER SUPPLY chroma signals, demodulated in IC201, and output from The power supply circuit of the EB4-A chassis is pin30 (R-Y) and pin31 (B-Y). These chroma signals pass composed of a rectifier smoothing circuit, an oscillation through the 1H delay line circuit (IC271), and they are circuit, a control circuit and an output rectifier circuit.
Pin25: Black 6. HORIZONTAL OUTPUT Pin26: IREF A horizontal oscillation signal is output from pin37 of Pin27: Odd/Even output IC201 and switches the drive transistor Q431. This Pin28: GND switching signal is current amplified by the drive Pin29: - transformer T431 and drives the output transistor Q432. Pin30: V-deflection stop output When Q432 becomes ON, an amplifying current flows Pin31: RGB REF...
CABINET DISASSEMBLY CABINET BACK DISASSEMBLY 1. Remove 10 screws(A). 2. Pull out the cabinet back. PLACING THE CHASSIS TO SERVICE POSITION 1. Pullout the chassis and put it to the rails on the side cabinet. 2. Fix main board with hook on the top rail. EB4 MKII chassis...
SERVICE CONTROL ADJUSTMENT B1 POWER SUPPLY ADJUSTMENT 5. Set mode to one horizontal scanning line, how to set 1. Set VR641 to be mechanical centre before pressing refer to "service mode" the main switch. 6. Set screen VR for one colour to be just visible. 2.
CIRCUIT ALIGNMENT VIF alignment SETTING Adjustment 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 20dB 0dB=176mVrms/75 SIF alignment SETTING Waveform Adjustment...
INITIALIZATION (Important Notice) When you replace a memory IC (IC802), it is necessary to initialise the IC as following step. A. Initialization Press and hold the ( ) normalization button on the remote control handset and press the ( programme + button on the TV set. The IC will be initialised automatically to set the following data.
SPECIAL FUNCTION 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 prohibition of presetting. Start up programme position ITEM-1 SET ->...
SERVICE REF. NO. CE21DN3-C-04 CABINET PARTS LIST Note: Parts order must contain Service Ref. No., Part No., and descriptions. SURROUND BASS -/-- MENU Ref. No. Part No. Description Ref. No. Part No. Description CABINET PARTS 610 273 1897 ASSY,CABINET FR-F3JA-A...
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.
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Ref. No. Part No. Deacription Ref. No. Part No. Deacription 403 317 4608 CERAMIC 0.33U K R3468 401 037 5400 MT-GLAZE 1K JA 1/10W C3474 403 279 4302 CERAMIC 0.33U K R3469 401 038 2101 MT-GLAZE 2.7K JA 1/10W 403 317 4608 CERAMIC 0.33U K R3471...
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2SA564(QA,RA), oppure 2SA1015(O,Y) specified on the part service manual and controls adjusted for normal picture. in posizione "OFF". Il voltaggio puo variare CE21DN3-C-04 SERVICE REF.NO. sostituti esclusivamente con quelli indi- a meno che sia specificato altrimenti. be used for components replacement Waveforms were taken by using a wide con l'intensita del segnale.