View Sharp 66GS-62 (serv.man24) Technical Bulletin online
normally permanent, most of these can be resolved by reprogramming or blanking the non-volatile memory (NVM).
It is recommended that reprogramming the NVM with data downloaded from the Sharp Technical Website is carried out
if data corruption is suspected. However, if no programming facility is available, the NVM can be blanked by using one
of the ‘jigs’ listed below.
and PWB version used.
2. Plug the correct blanking jig into the empty socket (ensure that it is correctly inserted).
3. Turn the set on.
4. Wait for one minute.
5. Turn set off.
6. Remove jig from socket.
7. Plug original IC1002 back into socket.
8. Turn on set and wait for data to be downloaded into the NVM.
9. Tune in and adjust as necessary.
During production, the processor was changed for an alternative type and this resulted in a change of the NVM and
EEPROM. For further details of these changes, please refer to the Part Changes and Corrections Technical Bulletin.
As mentioned above, NVM problems are many and varied, but the more typical ones are listed below. If in any doubt
as to whether the fault is caused by a corruption of the NVM, reprogram it.
To cure this problem, either reprogram or blank the NVM. A blank raster can also be caused by faults in the vertical
stage – see the Picture Problems Technical Bulletin for more information about this.
Either reprogram or blank the NVM. This problem may cause the power supply to go into the standby mode, or just
inhibit the line or east/west drive signals. Checking waveforms and voltages may be misleading with this fault scenario.
This normally happens after the NVM has been blanked. Set up the NVM as follows:
Lines at the top of the picture can be caused by corruption of the memory, check and set the NVM locations as follows.
The fault can also happen if the +25V is low to the vertical flyback circuit or if there is a fault in the vertical, reducing the
Due to a corruption in the EEPROM, when entering the service mode on some earlier GA10 chassis’s, the picture is
dark. By using the channel up button to step to one of the RGB gain settings, the brightness will increase to a
watchable level. Service adjustments can now be carried out normally.
require replacing IC1002 and IC1003.
this chassis. It has been compiled to show all the part numbers for items refered to in this document. If the parts noted
in the text are not faulty, carry out fault finding procedures to locate the problematic part.