Kipp&Zonen Brewer MkIII User Manual

Page 11

MKIII SERVICE MANUAL

If the power supply appears to be normal, then the LED may be defective, or there may be a faulty
connection.

4. Measure Voltages
The main power supply voltages can be checked at the test points on J23 of the Main Electronics
board. (Refer to the chart for correct voltages).

Connector J23 Monitor
points

Pin
1

Pin
2

Pin
3

Pin
4

Pin
5

Pin
6

Pin
7

Pin
8

Pin
9

Pin
10

-5v

12v

-12v 24v

2.5v 4.5v

Gnd

3.2 TROUBLE SHOOTING SEQUENCE FOR "NO OPERATION" CONDITION

It has been established that there is Power, motors reset, but that there is absolutely no
communication between the PC and the Brewer.

1. Reset
A software reset should be attempted after the "Brewer Failed to Respond" message appears on
the PC monitor, or the PC has tried a number of times to establish contact with the Brewer. The
software reset is done by pressing



key on the PC following the error message, or launching the

Brewer software from the DOS prompt. If this fails to establish communications, the PC should be
given a ‘cold’ boot (power OFF/ON).

2. Check cables
If there is still no response, the cables should be inspected to ensure that a connector has not been
inadvertently removed or pulled out of place. The Communications cable to the Brewer from the
PC, as well as the power cable to the Brewer should be checked. All cables involving the linking of
peripherals should be checked to ensure that they are plugged in as well. After this has been done
another software reset can be tried.

3. Test serial port
Check that the computer serial port is operating correctly by running a serial communications
program such as Telix, Procomm, or Windows Hyper Terminal. Make sure the serial
communications program is set to 1200 baud, is in full duplex mode, and the correct serial port has
been selected. Refer to the communications program documentation for correct operation.
Remove the RS422 adapter from the back of the computer and connect pins 2 and 3 of the
computer serial port together. While running the communications program in full Duplex mode,
characters typed should be seen echoing to the monitor. Disconnecting the jumper wire should
stop the echo-back. This test confirms that the computer serial port is operating correctly. If the
computer did not echo the characters change the Brewer’s configuration to use another port (see
section 3.6 in the Operator’s Manual) or have the defective serial port repaired before doing any
further tests.