REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Saturday, 16 March 2019

PIONEER PDP 4280X - HOW TO COPY BCK-UP DATA - HOW TO CLEAR HISTORY DATA

PIONEER PDP 4280X - How to copy Bck-Up Data - HOW TO CLEAR HISTORY DATA

TO COPY BACKUP DATA
Adjustment data are stored in the EEPROM (IC3156/4K) on the DIGITAL Ass’y in the production process. Those adjustment data are also automatically stored in the EEPROM (for backup: IC3652) on the SENSOR Assy.  If the DIGITAL Ass’y is replaced, those adjustment data for backup can be copied from the EEPROM on the SENSOR Ass’y to a new DIGITAL Assy.
Backed up data
  • Drive voltage adjustment value
  • Hour-meter count
  • Pulse-meter count
  • Panel white balance adjustment value
  • Serial No.
  • Drive waveform adjustment value
  • P-ON counter value
  • PD/SD histories.
How to copy backup data
When the DIGITAL Assy is replaced with one for service (usual service).  Copying the data backed up in the SENSOR Assy to the EEPROM on a new DIGITAL Assy can restore adjustment data.  The EEPROM on the new DIGITAL Assy has no adjustment data, and the EEPROM for backup in the SENSOR Assy has adjustment data. After replacing the DIGITAL Assy, enter PANEL FACT. Mode, displays the PANEL INFORMATION page, then check if "NO DATA!" is set for "DIG. EEP" and "ADJUSTED" is set for "BACKUP". Then, proceed in the following steps:
Copying, using the Factory menu
  • Plug in the AC cord, press the Power switch on the unit to set it to ON, then enter Standby mode.
  • Turn on the power, using the remote control unit, then enter Panel Factory mode.   Copy the backup data, as shown in the figure below.
  • Turn the power off.
  1. After the DIGITAL Assy is replaced with one for service, be sure to check if "NO DATA!" is set for "DIG. EEP" on the PANEL  INFORMATION page of the PANEL FACT. mode.
  2. If copying of the backup data fails in the above procedure, the red LED lights, and the blue LED flashes, as a warning that  no backup data were copied.
  3. If both the DIGITAL and SENSOR Assys are to be replaced, first replace the SENSOR Assy, turn the unit on and back off  again, then replace the DIGITAL Assy.
Copying, using the RS-232C commands
  • Turn on the unit, using the remote control unit or by issuing the PON command. Then issue the FAY command.
  • Issue the BCP command to transfer the data stored in the EEPROM for backup.
  • Turn the power off.
In a case where normal backup data are not stored in the backup EEPROM because  the EEPROM on the DIGITAL Assy is defective, etc., and where manually adjusted  values are to be applied to the product.
It is assumed that settings for various items have been completed, using Factory menu or RS-232C commands.
Method using the Factory menu
  • Set various setting/adjustment values.
  • Proceed in the following steps.
  • Turn the power off.
Note: When a DIGITAL Assy with an EEPROM in which adjustment data are stored is mounted, this step is not required after manual adjustment. ("DIGITAL EEPROM: REPAIR" is not indicated.)
TO CLEAR HISTORY DATA
Clearance of various logs after the Assys are replaced.
Besides adjustment data, data on accumulated power-on time and logs on defective parts of the product are backed up.  Some of those data must be cleared after the Assys are replaced for service.
Clearance of logs, using the RS-232C commands
CLICK ON THE CHART TO ZOOM
Notes: As the pulse-meter count is used for each correction function, it must be cleared when an Assy relevant to   correction functions is replaced.
When clearing logs, using the RS-232C commands, first enter Factory mode (by issuing FAY or PFY), then issue   the corresponding command. (2) Clearance of logs, using the Factory menu
  1. Plug in the AC cord, press the Power switch on the unit to set it to ON, then enter Standby mode.
  2. Turn on the power, using the remote control unit, then enter Panel Factory mode.
Delete various logs, as shown in the figure below:
Posted By: FRANK at 05:38
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