70FW-53E Datasheet PDF - Sharp

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70FW-53E
Sharp

Part Number 70FW-53E
Description SERVICE MANUAL
Page 30 Pages


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70FW-53E
SERVICE MANUAL
SE0070FW53E00
Issued: 01 August 2002
DA-50W CHASSIS
PAL B/G I / SECAM L L’ B/G D/K SYSTEM COLOUR TELEVISION
MODEL
70FW-53ESHARP E/ENL/ECG/I/SE
In the interests of user safety (required by safety
regulations in some countries) the set should restored
to its original condition and only parts identical to
those specified should be used.
CONTENTS
ELECTRICAL SPECIFICATIONS.....................3
IMPORTANT SERVICING NOTES...................4
ADJUSTMENT PROCEDURES........................5
PRINTED WIRING BOARDS..........................10
COMPONENT LOCATION TABLES................17
SCHEMATIC DIAGRAMS................................24
BLOCK DIAGRAM...........................................34
PARTS LISTING..............................................35
STEREO LED FLASHING CODES.................45
PACKING OF THE SET...................................46
SHARP CORPORATION
1
This document has been published to
be used for after sales service only.
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70FW-53E
SERVICE MANUAL UPDATE LOG SHEET
Technical Report No.
Technical Bulletin No.
Cause / Solution
Part No.
Page No.
Application
Data /Serial No.
Use this page to keep any special servicing information as Technical Report (Bulletin), Technical Information, etc.
If only part number changes are required, just change part number directly the part number in the Parts Listing Section.
If you need more information, please refer to the Technical Report (Bulletin).
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70FW-53E
ELECTRICAL SPECIFICATIONS
Power Input ..................... 220V-240 Volts AC 50Hz
Power Consumption
Normal Operation ..................................155W
(Method IEC 60107)
Stand-by Operation ....................................1W
Audio Power Output Rating (MPO) / Impedance
Internal Left Speaker ....................... 10W, 7
Internal Right Speaker ..................... 10W, 7
Internal Centre Speaker .............. 10W, 7
Speakers
Left / Right ........................................ 4 x 10cm
Centre .............................................. 6 x 13cm
Convergence
Static (Centre)
between any two colours......................0.08cm
Dynamic after static equals zero
Within 10cm (4”) circle.........................0.12cm
10-28cm (4-10”) circle..........................0.20cm
Everywhere else...................................0.28cm
Focus ....................... High Bi-Potential Electrostatic
Sweep Deflection ...................................... Magnetic
Picture Intermediate frequency
L’..................................................33.9MHz
L, B/G, D/K,I................................38.9MHz
Sound Carrier Trap
L’..................................................40.4MHz
L, D/K...........................................32.4MHz
B/G..............................................33.4MHz
I....................................................32.9MHz
Adjacent Sound Carrier Trap
L’..........................................................32.4MHz
L, D/K, B/G..................................40.4MHz
I....................................................40.9MHz
Adjacent Picture Carrier Trap
L’..........................................................41.9MHz
L, D/K,I.........................................30.9MHz
B/G..............................................31.9MHz
Aerial Input Impedance
VHF/UHF ................. 75 ohm Unbalanced
Tuning Ranges.......45.75MHz thru 855.25 MHz
VHF: IR A~J / S1~S41 CH (HIPERBAND)
E2~E12 / F2~F10
UHF: E21~E69 CH, I21~I69 CH
CATV Special Channels
White Level
Set brightness control to get total picture tube cathode current of 600 µA under no signal condition.
Maximum necessary correction of each picture tube cathode current to get 8550 degrees K+1 MPCD.
Screen temperature should not exceed 15% of its original value.
X=0.290 ± 0.015
Y=0.300 ± 0.015
Specifications are subject to change without prior notice.
EN 61000-3-2
In order to comply with the European Norm 61000-3-2 regarding Electromagnetic compatibility (EMC),
it has been included mainly, in the PFC Circuit (Power Filter Correction), on every TV set manufac-
tured from January 2001.
On TV set manufactured before the above date (Serial Number 800929 for 70FW-53E or previous),
this modification is not required.
WARNING
Part of this chassis is not isolated from the mains supply. When carrying out any servicing work,
ensure that an isolation transformer is connected in the mains supply.
To prevent electric shock, do not remove the cover unless you are qualified to do so. Refer servicing
work to a qualified engineer.
3
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70FW-53E
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 disconnected 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 32 KV,
(at a instantaneous beam current of 1300mA).
2. Ensure that during normal operation the EHT does not exceed 29KV±1KV (at a beam current of
1500mA). This level has been preset in the factory. Always check that this level has not been exceeded 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.
4
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