Test and Configuration Settings
7-1
Revision 2 - 26 April, 2000
HP SERIES DIMMER
TECHNICAL MANUAL
7.0
Test and Configuration Settings
7.1
CPU self-tests
A number of CPU test routines are contained in the EPROM. To run these tests set DIP
switch 3 on, DIP switch 4 off, and set DIP Switches 1 and 2 as required (see below) and
apply power.
•
SW1 OFF, SW2 OFF: CPU RAM test. The green LED should light after
approximately 15 seconds. Note that this test corrupts the CPU RAM therefore
a Deep Clear (see section 4.2) must be performed afterwards when the
CPU is to be used in a dimmer.
•
SW1 ON, SW2 OFF: CPU ADC test. A DAC is plugged into the “MUX
EXPANSION” socket and a crude linearity test is performed on the ADC. The
green LED should light after approximately 0.2 seconds. The DAC is shown on
the circuit diagram.
•
SW1 OFF, SW2 ON: CPU DMX loopback test. A link lead is connected
between the DMX Loop and the DMX Input socket, and data is transmitted
and checked for correct reception. The green LED should light after
approximately 0.5 seconds. The relays should click at the commencement of
this test.
•
SW1 ON, SW2 ON: Front panel interface test. The front panel bus is tested
with a known good front panel PCB by reading the switches and lighting the
associated LED. ie. the channel LED will illuminate (both colours) when the
channel “Select” switch is pressed, the keypad LEDs will illuminate when the
associated buttons are pressed. When the “Enter” button is pressed the
“Signal” LED illuminates. The encoder circuit is also tested here - when the
encoder is turned the number in the display should increase or decrease
depending on which way it is turned. This test can also be used to test front
panel PCBs.
Test Limitations:
•
The zero crossing generators are not tested.
•
The encoder test relies on the operator to check proper operation in both up
and down directions.
•
The analogue mux input circuit is not adequately tested.
•
The FLASH program voltage is not tested.
•
The channel outputs are not tested.
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