Shure M367 User's Guide download pdf (Page 9)

Master Gain Remote Control

Note:

This modification will disable both the M367’s monitor

function

and

its front–panel Master gain control,

1. Locate resistor R641 (near Monitor In jack J863) and remove

it.

2. Locate resistor R746 (near Master potentiometer R706) and

remove it.

3. Locate empty pad X702 (near Master potentiometer R706).

Solder one end of a 100 Ω,

W resistor in the hole of X702.

Solder an insulated wire to the other end of the 100 Ω resistor.

Locate empty pad X644 (near jack J863). Solder the other end

of the insulated wire to X644.

4. Locate empty pad X701 (next to empty pad X702). Solder an

insulated wire to X701. Locate empty pads X645 (near jack

J863). Solder the other end of the insulated wire to the empty

pad X645 nearest channel 6 input connector J856.

5. Construct a remote control potentiometer/cable assembly as

shown in Figure 7.

TIP

RING

SLEEVE

MASTER GAIN REMOTE CONTROL

FIGURE 7

Recommended parts are:

Potentiometer, 10–25 kΩ, linear taper (Radio Shack

271–1715)

–Inch Stereo Phone Plug (Switchcraft 280)

Ferrite Bead Rings (Ferronics 21–031J)

Capacitors, ceramic, 0.001 µF, 50 V

Cable, 2–conductor, shielded, 50 ft maximum

Ferrite bead rings and capacitors should be as close to the

phone plug as possible.

6. Insert the phone plug in the Monitor In jack. The remote control

potentiometer now controls M367 gain with a control taper

similar to that of the Master gain control.

Changing Limiter Release Time to One Second

1. Locate resistor R741 (about 15 mm behind ribbon cable as-

sembly W813) and remove it.

Changing Limiter Threshold Presets

1. Determine the desired limiter thresholds and select the equiva-

lent resistor values from the following table. Then fill in the

worksheet that follows with the resistor selections.

Limiter Threshold

(dBm into 600 Ω)

equiv

(kΩ) Limiter Threshold

(dBm into 600 Ω)

equiv

(kΩ)

0 18 10 81

1 21 11 93

2 25 12 105

3 30 13 122

4 35 14 139

5 41 15 156

6 47 16 175

7 54 17 194

8 62 18 215

9 71

DIP Switch S701 Limiter Threshold R

equiv

(above)

Position 2 Position 3

—

dBm

—

up up high _____ _____kΩ = R1

down up med. high _____ _____kΩ = R2

up down med. low _____ _____kΩ = R3

down down low _____ _____kΩ = R4

2. Locate resistors R721, R731, R732, R733, R734 and R735

(surrounding IC U704) and remove them.

3. Locate empty pads X732, X733, X734 and X735 (surrounding

IC U704).

4. Select a

W, 1% resistor closest in value to R1 (from the

worksheet), and solder it to the holes of X732.

Note:

Use parallel or series combinations of resistors to match

the chosen values as closely as possible if 1% resistors are not

available.

5. Calculate resistor R5 value as follows:

R5 =

–

Select a

W, 1% resistor closest in value to R5 and solder

it to the holes of X733.

6. Calculate resistor R6 value as follows:

R6 =

–

Select a

W, 1% resistor closest in value to R6 and solder

it to the holes of X734.

7. Calculate resistor R7 value as follows:

R7 =

–

Select a

W, 1% resistor closest in value to R7 and solder

it to the holes of X735.

An example of limiter threshold preset component calculations

is given in the

Appendix

Graphic SymbolsThe M367 rear panel contains graphic sym-

bols with the following meanings (see Figure 8). (A) indicates

the presence of dangerous voltage. (B) indicates that the user

should consult the instruction manual for explanatory material.

rating and type.

GRAPHIC SYMBOLS

FIGURE 8

(A) (B) (C)

1 2 3 4 5 6 7 8 9 10

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Shure M367 User's Guide Page 9

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