6
Repair
Shorted cables, faulty fixtures and accidents do occur, so it is possible that at
some point in the life of your splitter a data port may be subjected to voltages or
currents that exceed the capacity of the built in protection. In that case a
receiver/transmitter or optical isolation data chip may be damaged. In order to keep
down time to an absolute minimum spare data chips are included on board for
immediate solder free replacement.
If after following the trouble shooting guide
you believe it necessary to replace the input RS-
485 chip:
1. Unplug power from the splitter
2. Remove the top cover
3. Remove chip #U1 “INPUT SN75176” by pulling
it straight up and out of its socket. (A small flat
blade may be used to gently pry the chip up but
be careful not to bend the leads or damage the
socket)
4. Remove the “SPARE SN75176” from its socket
in the same manner
5. Align the spare chip with the U1 socket, being
sure that the “dimple” signifying the “pin 1” end
of the chip is at the same end as the “notch” in
the socket (right hand end as pictured)
6. Gently press the spare chip until it seats fully in
the socket, being careful not to bend any leads
7. Replace the top cover
8. Re-test the unit for correct operation
If after following the trouble shooting guide you believe it necessary to replace
the output RS-485 and/or optical isolator chip for a specific channel:
* NOTE: It is recommended that the SN75176 be replaced before the 6N37
1. Unplug power from the splitter
2. Remove the top cover
3. Remove the possible faulty chip (U1-U5 6N37 opto-iso or U6-U10 output SN75176) by
pulling it straight up and out of its socket. (A small flat blade may be used to gently pry
the chip up but be careful not to bend the leads or damage the socket)
4. Remove the SPARE 6N37 or SN75176 (as needed) from its socket in the same
manner
5. Align the spare chip with the empty socket, being sure that the “dimple” signifying the
“pin 1” end of the chip is at the same end as the “notch” in the socket (right hand end
as pictured)
Omni DMX Splitter V1.01 1/31/19
Input PCB