GE AquaTrans AT868, User Manual

Page: 94 / 158

Parts Replacement 7-5
September 2004
Locating the EPROM
1.
Flip the board over and locate the
U4
EPROM socket. It is the
only socketed chip on this board and it has a white identification
label.
2.
Using a chip puller, remove the EPROM from its socket. If a chip
puller is unavailable, a straightened paper clip may be used in the
notches at the upper right and lower left corners of the socket.
Gently pry the EPROM up, a little at a time, at each notch until it
comes free.
Caution!
The EPROM is easily damaged by static electricity.
Before handling the new chip, touch a grounded metal
object to discharge any built-up static electricity and
avoid touching the leads on the side of the chip.
3.
Make sure that the beveled corner on the new EPROM is aligned
with the beveled corner of the socket and place the EPROM into
the socket.
4.
By applying equal pressure on all four corners, gently press the
EPROM into the socket until it is fully seated. Do not strike the
EPROM or apply excessive force during this procedure.
Reassembling the Unit
1.
Replace the Channel 1 board. To do this, carefully align the pins
along the back of the board with the connectors on the Channel 2
board. Firmly press the Channel 1 board down until all of the
connectors are completely seated.
2.
Secure the Channel 1 board by replacing the screw and standoffs
previously removed. Make sure you include the flat washers and
lock washers for the screw.
3.
Insert the keypad ribbon from the LCD/keypad board into the
connector and re-lock the connector by sliding the tabs downward.
Make sure the cable is not twisted.
4.
Replace the LCD/keypad assembly by carefully aligning the pins
on the back with the connectors on the Channel 1 board. Firmly
press the LCD/keypad assembly down until the connector is
completely seated.
5.
Secure the LCD/keypad assembly to the Channel 1 board with the
four screws, flat washers and lock washers previously removed.
6.
Reinstall the plastic shroud.
7.
Replace the cover and secure the six set screws.