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15
INTERNAL MODIFICATIONS
•
Only make changes to jumpers (X) and resistors (R). The cir-
cuit board contains holes where resistors are to be added.
•
For Channel modifications, the first character of the reference
designator indicates the channel number,(i.e., R1027 refers to
a Channel 1 resistor, X2001 refers to a Channel 2 jumper,
etc.). Modifications affecting the Master section are preceded
by a “9" (i.e., X9001).
•
All Channel modifications in this section use Channel 1 as an
example.
DISASSEMBLING THE SCM410/SCM410E
To access the printed circuit board for internal modifications, proceed
as follows:
1.
Remove the power cord from the ac power source.
2.
Remove the knobs, retainer nuts, and washers from the front
panel, as shown in Figure 16
3.
Remove the four screws at each corner of the rear panel.
4.
Remove the two screws at each bottom corner of the front panel.
5.
Slide the back panel and printed circuit board out from the rear of
the chassis.
CAUTION:
When reassembling the SCM410, DO NOT OVERTIGHTEN
the knob retainer nuts.Damage to the internal components will result if too
much force is used.
MODIFYING THE SCM410 FOR 220-240 VAC, 50/60 HZ OPERATION
As supplied, the SCM410 uses 100-120 Vac, 50/60 Hz power. To
modify if for use with 220-240 Vac, 50/60 Hz power, proceed as
follows:
1.
Disassemble the SCM410 according to the procedures in the
Disassembling the SCM410/SCM410E
paragraph.
2.
Locate Voltage Selector switch SW9001 adjacent to power trans-
former T9000.
3.
Using a screwdriver, turn the center rotor to the 230 position.
4.
Locate Fuse F9000 and replace it with a T 50 mA L, 250 V, time
lag fuse for 220-240 Vac operation.
5.
Replace the power cord with a cord rated for 220-240Vac operation.
MODIFYING THE SCM410E FOR 100-120 VAC, 50/60 HZ OPERATION
As supplied, the SCM410E uses 220-240 Vac, 50/60 Hz power. To modify
it for use with 100-120 Vac, 50/60 Hz power, proceed as follows:
1.
Disassemble the SCM410E according to the procedures in
the
Disassembling the SCM410/SCM410E
paragraph.
2.
Locate Voltage Selector switch SW9001 adjacent to power trans-
former T9000.
3.
Using a screwdriver, turn the center rotor to the 115 position.
4.
Locate Fuse F9000 and replace it with a T 125 mA L, 250 Vac,
time delay fuse for 100-120 Vac operation.
5.
Replace the power cord with a cord rated for 100-120 Vac
operation.
INSERTING A 12 DB MIC PREAMPLIFIER PAD
A microphone preamplifier channel gain can be reduced by 12 dB. This
may be desirable with high-output microphones.
Procedure:
1.
Short jumper X1000.
2.
Remove resistor R1006.
DISABLING PHANTOM POWER BY CHANNEL
To disable phantom power for a given microphone input channel, remove
the resistor specified in the following table
WARNING:
Voltages in this equipment are hazardous to life. No user-serviceable parts inside. Refer all servicing to qualified
service personnel.
KNOB ASSEMBLY AND DISASSEMBLY
FIGURE 16
Channel
Remove Resistor
1
R1005
2
R2005
3
R3005
4
R4005
Summary of Contents for SCM410E
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