Heathkit ET 3400 Manual

Page 2

Page 2

PART I

IMPORTANT NOTICE

After you install this Modification in your Microprocessor Trainer. the clock
frequency for the Microprocessor will be changed This change in clock fre-
quency will improve the performance of the Trainer and allow you to use it
successfully with the ETA-3400 0 Memory Accessory. However. the change in
microprocessor clock frequency will alsomodify some of the experiments in the
EE-3401 Microprocessor course. These experiments were designed to be used
with the standard trainer RC clock. We recommend that you complete these
experiments prior to installing this Modification Kit

PARTS LIST
KEY HEATH QTY. DESCRIPTION CIRCUIT
No. Part No. Comp. No.
A1 6402-12 1 1000 I! (brown-blaett-red) R49
resistor

54 21-51 1 20 pF ceramic capacitor C23
CI 56-89 I 60510 diode

344-59 15' White wire

347~55 8' 8-wiru (tat cable
H14 404-536 1 4 MHz crystal Y|
53 432-1062 1 40-pin dual connector

84640 i' Siewing

Instruction sheet

Heathkit'

597-1954-02

Page 12

Page 12

Heathkit

WARNING

This equipment is marketed pursuant to a waiver of
FCC Rules Part 15 Subpart J. Operation of this
computer in a residential area may cause objection-
able interference to radio andTV reception. because it
may emit more radio frequency energy than the FCC
Rules allow. If interference occurs. the user will be
required to lake all steps necessary to correct the
interference.

Constructing this product in strict accordance with
the instructions in the Assembly Manual will
minimize radio frequency interference signals emit-
ted by the product.

if this equipment does cause interference to radio or
television reception. which you can determine by
turning the equipment off and on, try to correct the
interference by one or more of the following mea-
sures:

0 Move the computing device away from the
receiver being interfered with.

o Relocate the com puting device with respect
to the receiver.

a Reorient the receiving antenna.
0 Plug the computing device into a different

AC outlet so that the computing device and
receiver are on different branch circuits.

0 Disconnect and remove any [/0 cables that
are not being used. [Unterminated 0 ca-
bles are a potential source of high RF emis-
sion levels.)

0 Unplug and remove any serial 0 circuit
board cards that are not being used. (Here
again. unterminated cards can be a source of
potential interference.)

0 Be certain that the computing devices are
plugged into grounded outlet receptacles.
(Avoid using A/C cheater plugs. Lifting of
the power cord ground may increase RF
emiSsion levels but also presents a lethal
shock hazard to the user.)

if you need additional help. consult the dealer or ask
for assistance from the manufacturer. Customer ser-
Vice information may be found on the inside back
cover of this manual or on an insert sheet supplied
with this equipment. You may also find the following
booklet helpful: How to identify and Resolve
Radio-TV interference Problems. This booklet is
available from the US Government Printing Office.
Washington, D.c.2o4oz-Stock No. 004-0004103454.