Kipp&Zonen Brewer MkIII User Manual
Page 13
MKIII SERVICE MANUAL
8
6. Line Driver
If the reset of the motors is heard and seen, but there is no message sent to the PC, then there
may be a problem with the line driver on the Main Electronics board. Ensure that power is turned
off and remove the Main Electronics cover plate and replace IC U11, (on a socket 2 inches up and
2 inches to the left of the LED). Make sure to use proper grounding precautions before touching
the electronics board. Leave the cover plate off and turn on the instrument. The motors should be
observed to reset and if the computer was left in the serial communications program, the Brewer
reset message will be displayed on the screen. Exit the communications program and launch the
Brewer operating program. Normal Brewer commands can be used for checking correct operation.
7. Check Mode of Microprocessor
If there is still no operation, there may be a firmware problem, or a problem on the Main Electronics
Board, so the functionality of this board should be tested.
There is a Red status LED located near the bottom left hand side of the board - it should be
flashing slowly in ‘Cosmac mode’ as per the following table. If the Brewer is in some other mode
change back to the Cosmac mode (step 10).
LED Mode indication
¼sec ¼sec ¼sec ¼sec ¼sec ¼sec ¼sec ¼sec
Cosmac mode normal
operation
On
Off
Off
Off
On
On
On
Off
Cosmac mode with
configuration missing
On
Off
Off
Off
On
Off
On
Off
Loadmode waiting for code
to be downloaded
On
Off
On
Off
On
Off
On
Off
Loadmode with bad flash
memory
On
On
On
On
Off
Off
Off
Off
Loadmode with good flash
memory
On
On
On
On
On
On
On
Off
Opmode with configuration
present
On
On
Off
Off
On
On
Off
Off
Opmode without
configuration present
On
On
Off
Off
On
Off
On
Off
Checking Flash memory
On
Off
On
Off
Off
Of
Off
Off
Changing from load to
cosmac or load mode
On
On
On
On
On
On
On
On