Sharp 72GF-66E service manual Important Servicing Notes

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72GF-66E

IMPORTANT SERVICING NOTES

Only qualified service personnel are allowed to carry out maintenance and repair of this receiver.

SERVICING OF HIGH VOLTAGE SYSTEM AND CRT

It is important that the static charge is removed from the high voltage system when carrying out work on the receiver. This can be achieved by connecting a 10K resistor (with a suitably insulated lead) from the CRT cavity connector to the CRT ground tag. This must be carried out with the AC supply discon- nected from the receiver.

Note the following:

•The CRT in this receiver employs Integral Implosion Protection.

•If the CRT has to be changed it MUST be replaced with the correct type for continued safe working

•DO NOT lift the CRT by its neck.

•When handing the CRT, ensure that shatterproof goggles are worn.

•Ensure that the CRT is discharge before handling.

X-RAY

This receiver is designed to keep any x-ray emission to an absolute minimum. Some fault conditions and servicing procedures may produce potentially hazardous x-ray radiation levels. This is a problem when in close proximity to the receiver for long periods of time. To reduce any risks associated with this, please observe the following precautions:

1.When undertaking any servicing on this chassis, DO NOT increase the EHT to more than 33 KV, (at a instantaneous beam current of 1800∝Α).

2.Ensure that during normal operation the EHT does not exceed 32KV±1KV (at a beam current of 1300∝Α). This level has been preset in the factory. Always check that this level has not been ex- ceeded after carrying out any repair on the receiver.

3.DO NOT replace the CRT with any other type than that specified in the parts listing as this may cause excessive x-ray radiation.

BEFORE RETURNING THE RECEIVER TO THE CUSTOMER

In addition to the above checks, the following should also be carried out before returning the receiver to the customer.

1.Inspect all the leads to ensure that they are dressed correctly and that they are not obstructed or pinched by any other parts.

2.Ensure that all protective devices are in good condition. These will include nonmetallic control knobs, insulating fish papers, cabinets backs, compartment covers or shields, mechanical insulators, etc.

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Contents Model 72GF-66E Electrical Specifications =0.290 Y=0.300Important Servicing Notes Adjustment menu Geometry AdjustmentsPin Phase Horizontal VerticalHorizontal Shift WidthLower Corner Correction Vertical LinearityVertical Angle Vertical BowColour Adjustments Follow the procedure below to set the Cut OffFollow the procedure below to set the Gain Vertical ShiftContrast Adjustments Dvco Adjustment PALDvco Adjustment Ntsc Auto Installation On/OffQKI KITP7293BMN5 QKITP7293BMN5 F7293BMN5 CRT Module Unit Printed Wiring Board F7269N3. Component side CRT Module Unit Printed Wiring Board F7269N3. Copper side Side Copper Digital Module Unit Printed Wiring Boards F7295NOA C6083Power Switch Unit Printed Wiring Boardsm F7305N0B Copper sideAudio Amplifier Unit F7304N0B PWB Parts Location Tables Audio Amplifier Unit Printed Wiring Boards F7304N0BComponent side FB1 Mother Unit F7293N5A PWB Parts Location TablesCN3 TRC JF6JF8 JF9JF2 JF3R817 214376 58674 R818 207518 61722 T702 56896 173228 CRT Module Unit PWB F7269N3 Parts Location Tables Component Side Copper sideFront A/V Unit PWB F7306N0B Parts Location Tables Dinamic Focus Unit PWB F7271N3 Parts Location TablesDigital Module Unit PWB F7305N0B Parts Location Tables Component Side. Copper sideDigital Module Unit F7295N0B PWB Parts Location Tables RGBJF4 JF5Description of Schematic Diagram 72GF 66E IC305 Sharp Schematic Diagram of CRT Module Unit F7269N3, 00 Version Sharp Front a Realizado Verificado AprobadoSchematic Diagram of Dinamic Focus Unit F7271, 00 Version Realizado Veri Module Digital Schematic Diagram Schematic Diagram of Power Supply Unit F7305, 00 Version Sharp Stereo LED Flashing Codes Block Diagram Video ProcessorBlock Diagram 72GF-66E Parts Description Picture TubeMother Unit Tuner Integrated CircuitsPackaged Circuits CoilsCeramic Filters TransformersCeram C 1UF 16V 2125SMD Ceram C 5PF 50V 2125SMDUVZ2C2R2MEH1TA Nichicon Ceram C 220PF 2KV ResistorsCeram C DE1410 E332M-KX MET Film R 1 OHM 5% 2W MET OX RES 1KOHM 5% 1WSET MET OX R 3,3KOHM 5% 3W LW Wound RES 47KOHM 5% 5WMiscellaneous Parts TRC Unit Integrated Circuits Digital Module Unit Integrated Circuits Zener Diode TZMC24 TFK SMD Zener Diode TZMC3V3 TFK SMDCrystal 5MHZ Acal Crystal 20.25 HMZPwbdigital Module VPC RGB Audio Amplifier Integrated CircuitsIC TDA7481 Thomson Line Filter Unit Coils Frontal A/V Unit CoilsCabinet Parts 1.2 1.3 1.5 1.6 Recycled Paper
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