CIRCUIT BOARD REPLACEMENT
WARNING, WARNING, WARNING, MAKE
SURE THE MACHINE IS DISCONNECTED
FROM THE MAIN POWER SOURCE
BEFORE REMOVING OR REPLACING
ANY CIRCUIT BOARD OR WIRING IN
THE MACHINE.
CIRCUIT BOARD REPLACEMENT
There are 10 circuit boards in the TapeChek
4100 in addition to the defect detector.
Needless to say, these circuit boards should be
handled carefully during removal or
installation. Of particular concern are the wire
connections and connectors going to the
circuit boards. Under no circumstances should
one remove a connector by pulling on the
wire, but rather pull on the body of the
connector shell to remove the connector. You
will notice three common types of connectors
and cable systems used in the 4100 machine.
These are:
(1) Flat wire connectors which carry anywhere
from 10 to 40 wires.
(2) Amp brand MATE-N-LOK ™ connectors,
these are white nylon shells with metal
contacts that crimp onto the individual wires
inside the connector. A special extraction tool
is required to remove the terminals from the
Amp connector shell.
(3) Insulation displacement connectors. These
connectors are either red or orange in color.
The wire is pressed into the terminal in the
back of the connector without stripping off the
insulation of the wire. A special tool if
required to make these wire terminations.
As stated before, always be very careful to
remove the connectors from the circuit board
before trying to replace the board with a new
one. Most of the electrical connectors on these
circuit boards are keyed so they only plug in
one way. Be careful to align the keyways
before inserting a connector into its socket or
look for color-coding of the plugs.
FRONT PANEL CIRCUIT BOARDS
There are three circuit boards on the front
panel of the machine as follows:
Machine Transport keyboard
(Power, Stop,
Eject, Etc.)
This circuit board is mounted with six screws
into 1" long metal standoffs. Note that one of
these screws goes through the mounting
heatsink tab of a device in the upper left corner
of the board. To remove the board, remove
these 6 screws and lock washers (if present).
Membrane switch keyboards
On the front panel there are two membrane
switch keyboards which are fastened with four
nuts. These boards also have "H" shaped
metal supports to keep the board from flexing
as they keypad is pressed. When replacing
this "H" support on the back of a new circuit
board, make sure that the "H" is aligned so that
the horizontal member rests on the insulating
mylar strip. Severe shortcircuits could occur
otherwise. To replace the board merely
remove the elastic stopnuts, washers, and
metal "H" supports. When installing the new
board, repeat the procedure and tighten the
elastic stopnuts so that they are snug.
DO NOT OVERTIGHTEN THE ELASTIC
STOPNUTS ON THE FOUR MOUNTING
STUDS.
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