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Troubleshooting & Checkout
Continued
4. Apply power to the DSP-8200d card cage. The normal and overload LEDs will flash
alternately during the power up stage and the heartbeat will begin the pulse at a
one-second rate. The DSP card cage control module alarm will go off.
5. Apply a 1000 Hz sine wave to each input and adjust the level so that the yellow
(normal) led is on and the red (overload) led is off. The output will be slightly higher
than the input when loaded into 600 ohms.
6. Vary the input frequency from 100 Hz to 5000 Hz. The signal will attenuate
outside of a 300-3400 Hz bandwidth. If it does not, it indicates that the signal is
being bypassed by the relay. An open transistor or defective relay could cause this
symptom.
7. If the DSP module passes these tests, reconfigure the mode to the desired operating
configuration.
Power Supply Modules
Each power supply module consists of an unregulated linear supply and a low noise 5.3
volt switching regulator. Diode rectifiers on the back plane of the card cage isolate each
power supply module from the other.
Test Procedure - Power Supply
1. Remove the power supply module from the card cage.
2. Apply power via the IEC power connector. Remember 110 Volt or 230 Volt AC is
present on the circuit traces.
3. Verify that the green led is lit. If the led is off, check the 1 Amp fuse.
4. Typical output voltages (unloaded).
Row
(pins a,b,c of DIN connector)
7,8
GND
10
+5.3 Vdc
(Digital)
11
+15 Vdc
(Analog)
12
-15 Vdc
(Analog)
