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UPDATE: Nakamichi BX-300 Repair - NEW Problem
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Hello Everyone:
Here is an update on my Nakamichi BX-300. This is the same tape deck
that has flickering
digits in its counter and keeps resetting its counter back to "0000"
AND keeps
putting itself back into PLAY mode - even when there is no tape in the
machine.
I have solved a couple of problems but caused another.
First of all, I have narrowed it down to IC701 on the counter PC
board. This IC
chip (microprocessor) apparently was faulty.
In the Nakamichi service manual, this chip is listed as LM6416E-106
I found an LM6416E at an online parts source that caters to repair
techs. There was no suffix of any kind
after the "E". It is just a "regular" LM6416E. I thought this IC was
the same
as the faulty one in the BX-300, but it's not.
no longer
has flickering numbers in the counter and the deck no longer puts
itself into
PLAY mode, so I'm happy about that....
Instead of "0000" when you first turn the deck on, you see "88_
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Yes, this is not a common part like a PIC or an 8051 based device, where you
could get a programmer and maybe read and write to it. PROM burners have to
know exactly which device they are dealing with, and have the hardware and
software capable of doing so. Its a bit like saying "I've got a computer so
I should be able to connect it to my BMW and reset the mileage".
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_" (the
underlines represent the two missing digits).
When you press PLAY the counter DOES NOT change.
When you press REW or FF, the counter briefly shows this:
"8_8_" ...and then
changes to this: "8_ _8" ...and DOES NOT change.
Unless someone has any ideas, I am either going to have to find a
parts deck to
get the proper LM6416E-106 chip, or I am going to have to live without
the counter.
I really wouldn't bother with this deck as I have other Naks that are
much
nicer, but this BX-300 has great sentimental value because it was my
very first
piece of Nak equipment.
DOES ANYONE HAVE ANY IDEAS HOW I CAN CORRECT THE PROBLEM - OR DOES
ANYONE HAVE
ANY SPARE NAKAMICHI IC CHIPS?
THE CHIP THAT CAME OUT OF MY BX-300 HAS THESE MARKINGS ON IT: 106
B-6368A 4F2
Thanks in advance to all who can help me with this!
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