Kipp&Zonen Brewer MkIII - Manual (Page 10)

MKIII SERVICE MANUAL 5
3 MAJOR EQUIPMENT FAILURES
A major equipment failure is defined as a condition where there is no communication between the
Brewer Spectrophotometer (Brewer) and the external control computer (PC). Symptoms are that
no commands go to the Brewer, and no information is received by the PC. This is a "no operation"
condition.
3.1 "NO OPERATION" - NO POWER INDICATION
1. Reset the Brewer
If any problem is fixed at any point in this trouble shooting procedure attempt to launch the Brewer
Software.
When the Brewer Software is launched the Brewer should send the following message to the PC:
BREWER OZONE SPECTROPHOTOMETER
#nnnnn
AES SCI-TEC
CANADA
VERSION 1 Jan 01, 1998
If this message is received then communications has been established between the Brewer and
the control computer.
If the instrument does not reset (as seen by motors initializing), the problem is probably in the
Brewer, but may also be in the communications cable, the PC or the software.
A fresh set of software can be loaded onto the Computer from the original discs to eliminate it as a
potential problem. Ensure that the Brewer configuration files are preserved as they contain
important operating information such as the COM: port number. Check the configuration files to
ensure that none of the files have been corrupted.
2. Check Power
If the GREEN LED on the Brewer is illuminated, then there is power to the instrument, and the
Main Power Supply is producing 5V. If the LED is not illuminated, then the AC power source should
be checked at the AC outlet and the end to end continuity of the Power Cable tested. The AC
power should then be connected directly to the Brewer, bypassing the Tracker.
If there is still a no-power indication, then the Brewer top cover should be removed and the MAIN
power supply checked to see if it feels warmer than ambient.
3. Check Power Switch and Fuses
If the cover is not warm, then perhaps the Power Switch is defective, or a fuse requires
replacement. With power disconnected, use an Ohmmeter to confirm that the Switch is functional,
and check the two fuses next to the power supply cover as indicated in the photograph. If a fuse
needs changing, ensure that AC power is disconnected, and replace the fuse with the appropriate
spare.
To check the fuse inside the power supply, disconnect AC power from the Brewer, remove the
Main Power Supply cover (four 6-32 screws) and measure or visually inspect the fuse and replace
it if necessary. When re-installing the cover, ensure that the Power Supply connectors remain
connected.
3 MAJOR EQUIPMENT FAILURES