Shure SCM810 User Manual page 13

Digital Controls or Microcomputers
The SCM810 logic pins can interface with custom-designed
digital control circuitry or microcomputers for unlimited possi-
bilities of system control functions.
VOLTAGE SELECTION
The SCM810 can be internally modified to operate from 230
Vac, 50/60 Hz power.
WARNING
Voltages in this equipment are hazardous to life.
No user-serviceable parts inside. Refer all
servicing to qualified service personnel.
The safety certifications of the SCM810 do not
apply when the operating voltage is changed from
the factory setting.
To change the operating voltage, follow these steps.
1. Disconnect the SCM810 from the ac power source.
2. Remove the eight Phillips head screws securing the top cov-
er.
3. Locate Voltage Selector switch SW903 adjacent to power
transformer T901 and, using a screwdriver, turn the center
rotor to the 230 V position.
4. Locate Fuse F901 and remove it. Replace it with a 100 mA,
250 V, time delay fuse for 230-volt operation (200 mA, 250 V,
slow-blow fuse for 120-volt operation).
Fuse part numbers are:
Fuse Type Shure Part No.
100 mA, 250 V 80C258
200 mA, 250 V 80BC8196
5. Replace the power cord with a cord rated for for 230 V op-
eration, i.e., an IEC appliance connector on the equipment
end and a CEE 7/7 ("Schuko") mains connector on the oth-
er.*
Similarly, the SCM810E can be internally modified to oper-
ate from 120 Vac, 50/60 Hz power.
To change the operating voltage, follow these steps.
1. Disconnect the SCM810E from the ac power source.
2. Remove the eight Phillips head screws securing the top cov-
er.
3. Locate Voltage Selector switch SW903 adjacent to power
transformer T901 and, using a screwdriver, turn the center
rotor to the 120 V position.
4. Locate Fuse F901 and remove it. Replace it with a 200 mA,
250 V, time delay fuse for 120-volt operation (100 mA, 250 V,
slow-blow fuse for 230-volt operation).
Fuse part numbers are:
200 mA, 250 V
100 mA, 250 V
5. Replace the power cord with a cord rated for for 120 V op-
eration, i.e., an IEC appliance connector on the equipment
end and a mains connector suitable for 120 V operation on
Littelfuse Part
the other.*
No.
218.100
*For systems requiring other mains connectors, obtain a power cord
239.200
with an IEC 320 type mating connector for connection to the SCM810,
and an appropriate plug on the other end for connection to the mains.
The supplied cord uses Harmonized IEC Cordage with color coding as
follows: Brown = Line, Blue = Neutral, Green/Yellow = Ground.
13
Fuse Type Shure Part No.
80BC8196
80C258
Littelfuse Part
No.
239.200
218.100