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form Dc Voltage Measurements as described below to
isolate the problem area.
AC Voltage Measurements
The numbers within rectangular symbols
u
on
the Circuit Diagram denote the ac voltage at that point
under the following test conditions:
1. Voltage measured with respect to chassis unless
otherwise indicated.
2. Line voltage: 120V, 50160 Hz (SR110) or 115V
or 230V (SRl10-2E).
3. Test signal of 40 mV, 1000 Hz applied across
pin 1-8 (for desired channel) and ground pin 11
of ACCESSORY INPUT AND OUTPUT connector
PI.
4. Measurements made with ac VTVM of 1 megohm
or greater input impedance.
5. Load across LINE LEVEL OUTPUTS Connectors
J3-J5: 600 ohms total.
6. Ac voltage measurements may vary *30% from
values shown.
DC Voltage Measurements
The numbers within elliptical symbols
o
on the
Circuit Diagram denote the dc voltage at that point
under the following test conditions:
1. Voltage measured with respect to chassis unless
otherwise indicated.
2. Line voltage: 120V, 50160 Hz (SR110) or 115V
or 230V (SR110-2E).
3. No input signal applied.
4. Dc voltage measurements may vary t 2 0 % from
values shown.
5. Measurements made with VTVM of 11 megohms
or greater input impedance.
Resistance Measurements
With the ac line cord disconnected from the ac
source and the POWER-OFF Switch in the OFF posi-
tion, the following ohmmeter measurements may be
made:
1. Transformers may be checked for continuity of
each winding.
2. To test transistors and diodes, see Transistor and
Diode Checking.
C
C
NOTE: ALTHOUGH OUTLINES MAY VARY, LEADS ARE
ALWAYS FORMED AS SHOWN ABOVE.
FIGURE L.
TRANSISTOR LEAD CODES
ARCHITECTS' AND ENGINEERS' SPECIFICATIONS*
The Monitor Mixer shall be a rack-mounted, 120-volt,
50/60 Hz line-operated all silicon transistor line level
mixer, designed for use with the Shure SR101 Series 2
Audio Console, SR109 Professional Mixer or similar
equipment which requires a stage monitor mixer sepa-
rate from the program mixer. The Monitor Mixer can
also be used in multi-track recording applications as
a submaster mix panel or mixdown panel. Intercon-
nections between the Monitor Mixer and SR101 or
SR109 shall be made through a single multi-pin con-
nector permanently fastened to the Monitor Mixer. A
parallel-wired female connector shall provide for inter-
connection of additional Monitor Mixers.
The Monitor Mixer shall contain eight high-imped-
ance, unbalanced, line level inputs to its mixing
circuitry, and one high-impedance, unbalanced, line
level input to its OUTPUT SELECTOR Switch for
monitoring program material. The Monitor Mixer out-
puts shall consist of one three-pin male professional
audio connector and two standard 1/4 inch three-circuit
phone jacks. Each shall be a line level, 600-ohm, bal-
anced output. The Monitor Mixer shall contain a MIX
BUS phono connector for interconnecting Monitor
Mixers.
The Monitor Mixer output circuit balanced 600-ohm
A l l specifications apply to SRl10-2E except: operating voltage is 105-125
o r 210-250 volts; non-switched ac receptacle is not provided.
line shall have an output rated at + I 2 dBm at less
than 1% distortion with a minimum clipping level of
19.2 dBm. The Monitor Mixer shall have a voltage gain
of 40 1 2 dB (program input) and a maximum input
sensitivity of 21 mV for a $ 4 dBm program output.
The input channel clipping level at 1 kHz shall be
2.5V minimum and shall increase with channel settings
below 12.
The Monitor Mixer shall be enclosed in a metal,
rack-mounting enclosure housing with a scuff-resistant
vinyl-covered front panel. The dimensions shall be
44.5 mm in height, 483 mm in width, and 232 mm in
depth (1% in. x 19 in. x 9% in.). The weight shall not
be more than 3.9 kg (8 Ib, 8 02).
The front panel shall contain eight rotary individual
channel Volume Controls, one rotary MASTER Volume
ControllPOWER-OFF Switch, a power-on indicator
lamp, an OUTPUT SELECTOR Switch, and a PHONES
Jack. A non-switched ac receptacle rated -for 500 watts
maximum load shall be provided on the rear panel.
Any Monitor Mixer not meeting all of the above
specifications shall be deemed unacceptable under
this specification. The Monitor Mixer shall be a Shure
Model SR110.
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