Originally Posted by SiggiTheCat
Hi there. I also have a new inquiry if that's OK.
I have a 2008 DMR-EX88EB (UK Model) that now fails on the Self-Check process (instigated from the U61 code). I've managed to find the right Service Manual on the Internet and according to the Service Mode 'Error History' check, the corresponding explanation is 'Defect of Digital PCB or Communication Error'. Under Service Mode, there is also a 'RAM Drive Last Error' check that can be queried. This check brings up the error 'Bad disc or drive malfunction'.
Do you think that the RAM drive error is a result of the PCB error in the Error History Check? In other words, can I safely presume that the problem lies with the Digital PCB rather than the RAM drive?
After being inspired by your various posts about repairing various Panasonics by changing either the RAM drive or the Digital PCB, I was hoping to be able to rescue this machine by exchanging the faulty part rather than following the standard Panasonic statement of replacing both the RAM drive and the Digital PCB simultaneously. However, I'm still a little confused about the significance of the number of ribbon connectors between the RAM Drive and the Digital PCB. This machine has four - does that mean the Digital PCB automatically holds the alignment data of the RAM Drive? And would trying to source a compatible (and functional) Digital PCB be the first port of call in my quest for success?
Incidentally, the RAM/DVD Drive model is VXY2008 (this seems to be different from any other model I've read about in this forum) and the Digital PCB is a VEP 79184.
Many thanks in advance for your thoughts.
My experience is limited to North American models.
From your description I'm assuming that your circa 2008 EX88 has a DVD RAM Drive and Digital PCB pairing similar to that of 2006 model year North American models.
The 2006 North American models are unique in that the RAM Drive controller and configuration/alignment data functionality are incorporated into the Digital PCB. According to Panasonic this design requires replacement of both components whenever there is a failure of either component. In practice this is not always so.
Other model years have a RAM Drive controller PCB mounted on the underside of the Drive itself with a single ribbon cable to the external Digital PCB. The Digital PCBs for different models/model groups might share the same VEP number but have been factory configured for a specific model (or models) and might not be compatible with other models of the same model year. I've addressed these matters in this and other threads in this Forum.
In other threads I've addressed a variety of conditions that return the U61, U88 and U99 error codes. These range from problems related to ribbon cable alignment or damaged ribbon cable contacts/contact strips, a failing or failed laser assembly (the "optical pick-up"), failing or failed capacitors (usually those on the power supply pcb), mechanical parts misalignment, misalignments between front panel pcbs and chassis motherboards, problematic drive controller boards or PCBs, problematic front panel mini-switches, to inferior media or use of "+" media.
The following post describes RAM Drive ribbon cable arrangement and connections of 2006 North American models:
Routine RAM Drive servicing is addressed in this thread: