Peter,
*******
With regard to Checking the Various Pins on the the following Parts,
which you previously reccomended. (See Below for Actual Output Details)
1.) 74LS74 - Loc 2M - Pin 11 = Output is Pulsing Fast High / Low / High,
more High than Low.
2.) 74LS04 - Loc 3P - Pin 3 = Output is Pulsting Fast Low / High / Low,
more Low than High.
3.) 74LS161 - Loc 3R - Pin 2 = Output is Pulsing Fast High / Low / High.
4.) 74LS161 - Loc 2N - Pin 2 = Output is Constant Low
Pin 11 = Output is Constant High
Pin 12 = Output is Pulsing High / Low /
High,etc...
Pin 13 = Output is Pulsing High / Low /
High, etc....
Pin 14 = Output is Constant Low
Also and in order to Update Yourself on what Parts have actually / recently
been replaced,
here is my latest list of what I have actually done, unfortunately to no
avail at this time::
> Replaced / Reburned All ROMS
> Swapped All Onboard Rams
> Replaced the CPU - 6809E
> Replaced the 12.096 Mhz Crystal
> Replaced Part Loc -- 0D/E
> Replaced Part Loc -- 1N
> Replaced Part Loc -- 2C, 2M, 2N, 2P, 2R
> Replaced Part Loc -- 3R
> Replaced Part Loc -- 6E, 6F, 6R
> Replaced Part Loc -- 7E
> Replaced Part Loc -- 10R
> Replaced Part Loc -- 11N
Current Status is the same as before, with Power Applied, All Voltages /
Clocks are present and Good.
All LED's Remain Lit on the Main Board, No Acknowledgement when RESET to GND
Pins are Connected.
(Board will Not Reset)
Watchdog Continues to Bark (High / Low / High) if WDDIS PIN is connected to
GND Watchdog goes HIGH,
but wheter or not Watchdog is High the IRQ Pin Remains a Constant LOW, no
matter what is done.
Also when Watchdog is HIGH, as per the above, the Condition of the Board is
the same, no response to the
RESET CKT and ALL LED's on Board remain in a Constant LIT State.
Open to any and all suggestions.............
Arcadius................
---------------------------------------------------------------------------
** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
** message body to vectorlist-request@synthcom.com. Please direct other
** questions, comments, or problems to vectorlist-owner@synthcom.com.
Received on Mon Oct 7 16:15:23 2002
This archive was generated by hypermail 2.1.8 : Fri Aug 01 2003 - 00:34:12 EDT