Kurzweil K2000 Service Manual page 40

SECTION 2
K2RVOLTS.DOC 01/05/93
2.23 CHANGING THE K2000R SYSTEM SOFTWARE
Note: The ICs containing the K2000R's software are Static sensitive devices.
USE ALL ANTI-STATIC PRECAUTIONS WHEN HANDLING THESE DEVICES!
2.23.1 To replace the ICs:
Turn the unit off and remove the AC line cord from the AC power connector.
Remove the cover as described in Section 3 of the Service Manual.
Locate the old software ICs - U3 and U6 on the Engine board (Figure 2.11).
Remove the old ICs using an IC puller or similar tool. Be careful not to
damage the traces on the Engine board.
Carefully insert the new IC labeled "LO" in the socket at U3, and the new IC
labeled "HI" in the socket at U6. Make sure the ICs are oriented with pin 1
towards the front of the unit. Pin 1 is on the end of the IC which has the
indentation in the middle.
Inspect for proper installation - make sure the
ICs are firmly seated into the sockets and that none of the pins of the ICs
are bent.
Replace the cover as described in Section 3 of the Service Manual.
Always HARD RESET the instrument after changing the software. Note that all
user data in RAM will
be
erased. A hard reset can be performed on power-up by
pressing and holding the "1", "2", and "3" buttons on the numeric keypad while
turning on the power switch. Continue to hold the buttons until a message
appears in the display.
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