Fitting a HAPN-T V2.0 4800 board to a Paccomm Tiny 2 Mk II, V1.7
Modifications to the PACCOMM Tiny2 Mk II Rev 1.7
Some of these mods are necessary to connect the modem on J5, some
change the on board pre-emphasis and others are to
fix PACCOMM's design faults. In my case, the circuit diagram supplied
with the TNC did not accurately reflect the
actual board implementation.
While you are at it, you might check if your board is one of the
many with a production fault. The C23 + terminal
should connect to U20-15 (ignore the overlay and actually check the
tracks - the overlay is incorrect in the faulty
units).
Steps:
- Cut the track from J5-11 to J5-12
- Cut the track from J5-16 to J5-17
- Cut the track from J5-21 to J5-22
- Cut the track from the jumper JPR on top of the board just in
front of C18 (the track does not connect to
C18).
- Cut the track on the bottom of the board between U11-3 and the
nearby via hole
- Run a wire from JPR-2 to the via hole on the cut track
- Run a wire from U10-1 to U11-3
- Run a wire from JPR7 to J5-16
- Cut the track under the board from S2 near P3-1 (the track does
not connect to P3)
- Remove R11 and replace it with a jumper
- Remove C8 and replace it with a jumper
- Set JPL to NORMAL
- Set JPR to 1200
- Remove JPA
- Remove JPD
- Remove JPRA
- Replace C27 with 0.01uF
- from J5-11 to J5-12
Modifications to the HAPN-T
Steps:
- Install a 26 pin header
- Run a jumper from U6-2 to U6-14
- Run a jumper from J4-2 to J102-5
- Run a jumper from J4-21 to J102-1
- Remove the 2 pin header and replace it with a 90 degree 2 pin
header
- Install a switch on the front or rear panel and wire it to a 2
pin header plug, and fit to the above header
© Copyright:
Owen Duffy 1995, 2021. All rights reserved. Disclaimer.