Replacement Of Modules - Bang & Olufsen BeoSound 4 2851 Service Manual

Replacement of modules

Replacement of the PCB61 (SMPS)
Replacement of the Main microcomputer PCB6 (µPH8)
Note!
Exchange of software EEPROM on PCB6
Replacing of both PCB6 and EEPROM 6IC6
When replacing PCB6 (SMPS), remember to check jumper at 6P08
Mains voltage 5V = jumper at 6P08 must be mounted
Mains voltage 220V = jumper at 6P08 must be removed
6P08
Main
When replacing the PCB6 remember to move the EEPROM 6IC6 from the
defective PCB6 to the new PCB6, because it contains valuable data (Serial no., PIN-
code etc.). The data is not transferred to the new module until you have been in
contact with the PIN code protection or after 2 hours of connection to the mains.
This means that you can try out a new PCB6 without transferring the products
serial no. etc.
When the serial number has been transferred to the micro-processor, it can only
be used for this specific product; it must go back to Bang & Olufsen's module
repair department as an exchange module to be erased again. If the product
functions are OK, and the PIN-code protection is also OK; there is no need to test
the functionality of the PIN-code protection.
When exchanging the EEPROM on PCB6, the data from the micro-processor will
be written into the EEPROM, when selecting any source e.g. RADIO.
It is possible to borrow an EEPROM from another BeoSound 4 to test, if there is
suspicion of a fault in the original EEPROM. The EEPROM will always adopt the
data from the main micro-processor.
If both PCB6 and the EEPROM 6IC6 need to be replaced it is necessary to have
them pre-programmed from Bang & Olufsen with the correct serial no., otherwise
they will not work. Please contact Bang & Olufsen.
Replacement of modules
5.