Hi Folks,
I have a THP that on startup is displaying the message "PSE STBY
OPERSW!" after it gives me the THP/firmware version message. Doing a
bit of troubleshooting with a friend, it appears that it is the
processor or timing PIC. We checked the reference crystal and that was
dead on..
I am having a couple of major issues.. The biggest is the schematics and
parts lists that I have been able to find online are NOT matching the
actual circuitry. I have searched the net... Welcome to be proved wrong!!
One is a PIC 18f452 and I believe is the main processor. I have two, the
one in the amp and an older one by version number. The older version
chip is v1.5a with a newer date code. It does have 081218/REP (guessing
reproduced). The chip in the amp is v1.5c with a date code 091217. Both
produce the same result.
The second chip next to the processor actually had a felt or permanent
marker across it. U9. It is NOT listed anywhere (parts or schematic).
The second chip is a 12F683 (8-Pin Flash-Based, 8-Bit CMOS
Microcontrollers with nano Watt Technology). It may be the real
culprit... What little reading I have done, it is a timing function
device. It looks like it is supposed to supply the timing..
So a couple of questions..
Does anyone have one of these amps?
Anyone have the ability to read/program the 12F683 chip??
Any other suggestions would be great!!
TNX Will WC2L
--
William Liporace WC2L
http://www.wc2l.com or http://dxc.wc2l.com
AR-Cluster Node telnet dxc.wc2l.com or 144.93 MHz
wc2l@wc2l.com
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