Hi all,
'Tis been a good day for my screw driver, so I've been able to take apart my
Panasonic MJ30 and MJ75. I've been able to dig up some info on the web about
the chips I saw.
On each of these units, there's a Sanyo chip set (decode-only ATRAC chip and
"RF head amp", as listed on press releases), and a Panasonic chip (listed
simply as microcomputer).
The first Sanyo chip set documented online has ATRAC chip LC89640, and was
announced in November 97. The set that has LC89641 was announced in
September 98. While the older set consumes 120mW when in use, the newer set
only consumes 46mW.
These Sanyo chips all incorporate digital bass boost. However, they don't
include the DRAM for shock-resistant purposes. Instead, they support
external DRAMs.
The MJ30 has the LC89641 set. The MJ75, meanwhile, has a LC89642 set. Info
about the MJ75's chip was not found online, but it's probably another
evolution.
The specifications for the microcomputers have also been found. The MJ30
uses MN101C15C, which has RAM 2048(x8bit) and ROM 48K(x8bit). The MJ75 uses
MN101C28D, which has RAM 2048(x8bit) and ROM 64K(x8bit).
I'd like to mention that the MJ75 takes apart really nicely. Remove the
screws that hold the bottom cabinet, then the unit can be split into three
parts: bottom cabinet, chassis, top lid + disc holder. No small bits and
pieces to worry about. The circuitry/mechanism is also uncluttered, almost
elegant. If my digital camera didn't screw up, I'll have some pics for you
all soon.
Leon
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