Heathkit HKA 232 5 Manual

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P3992 »

INTRODUCTION

The Heath Model HKA-232-5 Mailbox Board adds a
bulletin board feature to your PackKit" Data Control-
ler. You only need to plug the Board into two existing
sockets on the main circuit board and solder one wire.

INSTALLATION

( ) Unplug the cables that are connected to the PackKit
Controller, if this has not already been done.

V ( ) Remove the six screws that secure the cover onto
your Controller. Then carefully lift the cover so
you can unplug the socket on the end of the wires
coming from the battery holder. Set the screws and
cover aside temporarily.

Refer to Pictorial 1 while you perform the following
steps.

(,,) Position your Controller as shown in the Pictorial.

(/)

Use a small-bladed screwdriver to carefully re-
move any integrated circuits that may be installed
at U2, U3, U4, and U5. Push the tool between each
[C and the socket and carefully lift the IC free.
NOTE: le may not be installed in all four socket.

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(y)

' Store the removed ICs in conductive foam (or

wrap them in aluminum foil) to protect them from
static electricity. These ICs will not be needed
again unless you wish to use the Controller with-
out the Mailbox Board installed.

Remove the screw that secures the main circuit
board to the chassis at location D.

Refer to Pictorial 2 while you perform the following
steps.

(-)

c»)

Position the Mailbox Board near the Controller as
shown in the Pictorial. Then crimp and solder the
free end of the wire coming from the Mailbox
Board to the indicated end of resistorR186 (330 Q,
orange-orange-brown).

Hold the Mailbox Board at an angle and carefully
start pins 1 and 28 of Mailbox Board plugs $101
and 8102 into holes 1 and 28 of main circuit board
sockets U2 and U4. Then carefully rock the Board

()

()

()

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back and forth until all of the pins are seated in the
sockets as far as possible.

Use long-nose pliers to hold the 1/2" spacer in
position between the Mailbox Board and the main
circuit board. Then use a 6-32 x 7 " screw and a
#6 lockwasher to secure the Mailbox Board to the
chassis at location D.

Position the cover near the chassis. Then recon-
nect the socket on the ends of the wires coming
from the battery holder to its plug on the main
circuit board. NOTE: The socket and plug are
polarized so you can connect it only the conect
way.

Use the six screws you removed earlier to reinstall
the cover onto the chassis.

Refer to the User Manual for information about using
the mailbox feature.

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Instructions

for the

Heath

MAILBOX BOARD
Model HKA-232-5

Copyrlgh! © 1990

Heath Company

All Rights Reserved HEATH COMPANY

Primed in the United Slates of Ameria BENTON HARBOR, MICHIGAN 49022 597-5878