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File name GA-1 EEPROM.pdf

CTV2001 09 01 TELEVISION TECHNICAL BULLETIN MODELS 37GT25H 37GT25IR Month of Issue: September 2001 Classification: White Page 1 of 1 51GT25H REASON NVM adjustment procedure ACTION When replacing the NVM it is essential that the data is correctly set for the model. If this is not carried out according to the information outlined below, the receiver will not be able to tune correctly and the teletext position will be poorly aligned. Model 37GT25H 37GT25IR 51GT25H Page 00 00 00 00 00 00 Location 0B 47 0B 47 0B 47 Value 72 0A F0 0A F8 1E Purpose TV options Teletext position TV options Teletext position TV options Teletext position All of the above locations are in hexadecimal format. To set the values, it is necessary to press the number keys on the remote control to 'toggle' the various bits between `1' and `0'. Note the examples below: Hexadecimal code (displayed on screen) Binary code Remote key to 'toggle' A 1 7 9 1 3 0 6 1 5 0 4 0 2 0 1 1 0 If the above value (A9) has to be changed to 5F, keys 1,2,4 and 5 will have to be pressed. A9 Binary code 5F Binary code Remote key to 'toggle' 1 1 0 0 1 0 5 0 1 4 1 1 0 1 2 0 1 1 1 1 Note that keys 0,3,6 and 7 do not need to be pressed, as the bit has already been set correctly. Also ensure that the AFT is set to 40 and adjust the geometry and grey scale as required. Sharp Electronics (UK) Limited Reference AVW10092001-1 Revision 1 White ­ Carry out as required Yellow ­ Carry out as required and whenever the unit comes in for service Red ­ Carry out on all units

File name GA-1 tuning drift.pdf

CTV2001 09 02 TELEVISION TECHNICAL BULLETIN MODELS 37GT25H (S/N 107****~) Month of Issue: November 2001 Classification: Yellow Page 1 of 1 51GT25H (S/N 107****~) SYMPTOM Tuning drift CAUSE ACTION R1021 For units with serial numbers below that shown above, change the value of R1021 from 22k to 12k, using the part number given below. Note that this resistor has been changed from July 2001 (serial numbers after the one shown above). REF NO R1021 DESCRIPTION Resistor, 12k PART NUMBER VRS-TV1JD123J PRICE CODE AA Sharp Electronics (UK) Limited Reference JC08082001-1 Revision 3 White ­ Carry out as required Yellow ­ Carry out as required and whenever the unit comes in for service Red ­ Carry out on all units

File name Sharp bulletin 37Am23H-009.pdf

File name Sharp bulletin 37Am23H-017.pdf

File name Sharp bulletin 37Am23H-020.pdf

CTV990705 TELEVISION TECHNICAL BULLETIN Month of Issue: July 1999 Classification: White Page 1 of 1 MODELS 37AM12H 37AM23H 37AT25H 51AT15H REASON How to set the reciever into the hotel mode ACTION To set any of the above models into the hotel mode, follow the procedure outlined below. To lock the tuning fuction change NVM location 0B as below. Model 37AM12H 37AM23H 37AT25H 51AT15H Tuning Locked 9C BC BC BC Tuning Unlocked 98 B8 B8 B8 To restrict the volume level, change the value of NVM location 0E. Volume Level 100% 85% 75% 60% 50% 40% Value FF DF BF 9F 7F 5F Sharp Electronics (UK) Limited Reference SP60800X Revision 1 White ­ Carry out as required, Yellow ­ Carry out as required and whenever the unit comes in for service, Red ­ Carry out on all units

File name Sharp bulletin 37At25H-011.pdf

File name Sharp bulletin 37At25H-017.pdf

CTV990103 TELEVISION TECHNICAL BULLETIN Month of Issue: January 1999 Classification: White Page 1 of 1 MODELS 37AM12H 37DM23H 51DT25H 37AM23H 37EM33H 37AT25H 37DT25H 51AT15H 37ET35H REASON As the NVM (IC1002) is supplied with default values for a number of models, it is necessary to reprogram the device on its installation. Depending on the model number, reprogram the NVM as follows. 37AM12H Location 0B Value 98 37AM23H, 37AT25H, 51AT15H Location 0B Value B8 37DM23H, 37EM33H, 37DT25H, 37ET35H, 51DT25H Location 0B Value F8 Location 47 Value 70 ACTION Note that location 47 changes the OSD position and may need adjusting slightly. For a full explanation of these codes, please refer to the service manual Sharp Electronics (UK) Limited Approval Date / / Reference SP85000X Revision 2 White ­ Carry out as required, Yellow ­ Carry out as required and whenever the unit comes in for service, Red ­ Carry out on all units Originator AvW Supervisor

File name Sharp bulletin 37At25H-020.pdf

CTV990114 TELEVISION TECHNICAL BULLETIN Month of Issue: January 1998 Classification: White Page 1 of 1 MODELS 37AM12H 37AM23H 37AT25H 51AT15H SYMPTOM No teletext Teletext jitters Unable to release child lock Intermittent sound and picture or ragged verticals Will not select tuning menu Tuning will not lock Blank raster of picture fades Line fold over Repeated failure of Q602 Stuck in standby Frame cramping Lack of height Excessive height Drifting off tune No remote control functions and/or front buttons not operating ACTION Decrease R1072 to 470k or replace D1002 Fit a 220nf capacitor in parallel with R521 (see Technical Bulletin CTV970808) Refer to Technical Bulletin CTV970208. Refer to Technical Bulletin CTV970206. Set NVM location 0B to read B8 or replace D1002. Dry joint on L205 or AFT VCO adjustment incorrect. D1002. D1002. Replace C713 with a 105 C type and replace D1002. Noise on 5V supply, replace D709 (may not read faulty). Replace D709, C713 and check semiconductors in the frame stage. R521 and adjust in service mode. R508. Refer to Technical Bulletin CTV970508. Q510. Check other components in frame stage o If you have a fault to add to the above list, please do no hesitate to contact Sharp Technical Support using the Hot Line telephone number. Sharp Electronics (UK) Limited Reference AVW120199/2 Revision 2 White ­ Carry out as required, Yellow ­ Carry out as required and whenever the unit comes in for service, Red ­ Carry out on all units

File name Sharp bulletin 37At25H-023.pdf

CTV2000 03 10 Month of Issue: Classification: TELEVISION TECHNICAL BULLETIN MODELS 37AM12H 37AM23H 37AT25H March 2000 White Page 1 of 1 SYMPTOM Tuner drift. CAUSE ACTION C1026 (VCO decoupling ­ microprocessor output). Replace C1026 REF NO C1026 PART NUMBER VCCSPA1HL101J DESCRIPTION Capacitor, 100pF 50V Ceramic PRICE CODE AA Sharp Electronics (UK) Limited Reference GW22032000-1 Revision 1 White ­ Carry out as required Yellow ­ Carry out as required and whenever the unit comes in for service Red ­ Carry out on all units

File name Sharp bulletin 37VT26H-008.pdf

CTV2000 04 04 Month of Issue: Classification: TELEVISION TECHNICAL BULLETIN MODELS 37VT26H April 2000 White Page 1 of 1 SYMPTOM Postcode password has been forgotten. ACTION Before removing the Postcode password from the product, please ensure legal ownership. To remove the Postcode password, follow the instructions given below. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Enter the service mode by shorting together TP2002 and TP2003 (see page 9 of the Service Manual) Press the DISPLAY button on the remote control to enter the NVM programming mode To change the address use the channel up/down keys To change the value use the volume up/down keys Change address 380 to FF Change address 381 to FF Change address 382 to FF Change address 383 to FF Exit the service mode by removing the shorting link between TP2002 and TP2003 Turn the mains off then back on again The Postcode password has now been removed Sharp Electronics (UK) Limited Reference JC31032000-3 Revision 1 White ­ Carry out as required Yellow ­ Carry out as required and whenever the unit comes in for service Red ­ Carry out on all units