SoundTraxx DSD-150/DSX Owners Manual - Manual (Page 39)

Digital Sound Decoder Owner's Manual 39
Note: If the sound becomes erratic or cuts out when the whistle or bell sounds are activated, you may need to change
the command station's track voltage setting to a higher level. If this is not practical or does not solve the problem, you
may try wiring the decoder's red wire directly to the DCC system's track output and bypass the 22 ohm resistor.
However, you must be extra careful performing the rest of the test as the resistor serves to protect the decoder from
accidental short circuits.
If the DSD still does not produce any sound it is possible that the CV settings may have been altered. You may skip
ahead to the Programming Test section and program the following CV to reset all CVs to their default settings:
CV 30 = 02
If this does not work, contact SoundTraxx for a replacement.
Motor Operation Test
The purpose of this test is to verify that the decoder correctly interprets the speed and direction commands that are
received from the command station.
1. Make sure no other decoder leads are shorted to any other leads.
2. Turn on power to the system.
3. Configure your DCC system to send commands to locomotive address 03.
4. After a moment, you should hear the sound of airpumps and blowers running in the background.
5. Select the forward direction and slowly increase the throttle speed. The Bipolar LED will begin to glow red.
6. Now select the reverse direction and slowly increase the throttle. The Bipolar LED should now begin to glow
green. If the LED does not light or change color, first check that the DCC system is set to address 03. Next, verify
the LED is working properly as outlined under Preparing the Test Fixture, page A-4.
If the LED still does not light or change color, contact SoundTraxx for a replacement.
Exhaust Cam Test
The purpose of this test is to verify proper operation of the DSD’s cam sensor.
1. Turn on power to the system.
2. After a moment, you should hear the sound of airpumps and blowers running in the background.
3. Locate the brown cam wire(pin 11 of the 3-pin Speaker/Cam connector.
Do not confuse with the brown wire of the
9-pin connector!). Tap this wire against either rail. As the cam wire makes contact, you should hear a chuff sound.
If you do not hear a chuff, it is possible that the CV settings may have been altered in which case you should have
noted a chuffing sound when performing the Motor Operations Test. If this is the case, you may skip ahead to the
Programming Test section and program the following:
CV 30 = 02, to reset the CVs.
Then repeat steps 1,2 and 3 above. If you still do not get a response, contact SoundTraxx For a replacement.
Auxiliary Function Output Test
The purpose of this test is to verify that the decoder correctly interprets the commands for the four auxiliary output
functions.
1. Turn power to the system OFF.
2. Disconnect the test LED from the gray and orange leads of the decoder. Insulate the ends of the gray and orange
wires with electrical tape.
3. Attach the black lead of the test LED to the decoder’s blue lead.
4. Connect the red lead of the test LED to the decoder’s white lead (head light). Make sure no other decoder leads
are shorted to any other leads.
5. Turn on power to the system.
6. Using your DCC controller, turn on Function 0 and set the throttle direction to forward. The Bipolar LED should
light. Turn Function 0 off and the LED should turn off.