PA2SNK > TNC2 28.12.20 01:31l 41 Lines 1372 Bytes #999 (0) @ WW
BID : 4961_PA2SNK
Read: DJ6UX DL7NDR GUEST
Subj: conn en sta led lit
Path: DB0FHN<DB0RBS<DB0ERF<DB0RES<ON0AR<VE2PKT<LU4ECL<PI8SNK
Sent: 201227/2325Z 64493@PI8SNK.#FRL.NLD.EURO [SNEEK/SNITS] FBB7.01.35 alpha
From: PA2SNK@PI8SNK.#FRL.NLD.EURO
To : TNC2@WW
# Generated by: TstHWin v2.21b - Registered to PA2SNK
# On : 28-12-2020 00:24:49
# UTC: 27-12-2020 23:24:49
Hi all.
Just managed to repair a faulty tiny2 mk-2
The conn and sta led keep lit..
After alot of tracing and measuring i found out that u4 was faulty.
It is a 74hc132 i switched one from another tnc and after that i got back
my reset singal on the z80 and z80sio.
btw just cut all the pins of the orig. ic and then pull out one by one.
solder a ic voet (whats the name in english?) and put in a new 74hc132 and
check back if pin 19 is low when powering up the tnc after a short period
it should go high and the leds would be off and you should have the sign on
on your screen of the firmware of the tnc.
This did the trick for my tiny2 mk-2
No one to the tnc2c tnc2x and a new 7805 for the tnc2c-nl...
happy soldering !
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PA2SNK te Sneek/Snits (Friesland)
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