Shure 407A, 407B User Guide

CODED

TERMINAL

MODEL 407A

MODEL 4078

INTERNAL CONNECTIONS

FIGURE 2

tubing over the switchblade or with a piece of insulating tape.

5.Place the microphone switch button in the normal position on the case-front. Place the case-back on the case-front and firmly press cases together. Fasten the case-back and case-front with the No. 6 Phillips self-threading screws previously

removed.

The microphone circuit of the Model 4078 is normally open when the microphone switch button is in normal position. The microphone switch of the 4078 may be rewired to have a normally shorted microphone circuit. To modify the Model 407B for a normally shorted microphone circuit, proceed as follows:

1.Remove the three No. 6 Phillips self-threading screws from the back of the microphone case.

2.Separate the case front and back and remove the microphone switch button.

3.Unsolder or clip the WHITE cable lead from the upper switch solder lug. (See Figures 2 and 3)

4.Solder the WHITE cable lead to the lower terminal lug, the one with the YELLOW lead going to the microphone cartridge. (See Figures 2 and 3)

5.Place the microphone switch button in the normal position on the case front. Place the case-back on the case-front and firmly press the cases together. Fasten the case-back to the case-front with the Phillips self-threading screws previously removed.

OPERATION

The Models 407A and 4078 will operate satisfactorily under all ordinary conditions of humidity, heat, and cold. Dropping the microphones or other severe mechanical shocks should be avoided.

UPPER LUG

LOWER LUG

REAR VIEW OF CHASSIS (CASE REMOVED)

FIGURE 3

SPECIFICATIONS

Frequency Response

300 to 4,000 Hz (see Figure 4)

= .,o

5 -10

lpoo

F R E O U W I* *Lmz

TYPICAL FREQUENCY RESPONSE

FIGURE 4

Output Level (at 1,000 Hz)

		407A		4078
Open Circuit Voltage* . . . . .-13.5			dB	-33.0	dB
		(210 mV)		(22 mV)
Power	Level* * . . . . . . . . . . . .			-52.0	dB
*O dB = 1 volt per 100 microbars
**0 dB = 1 milliwatt per 10 microbars
Impedance
407A-Microphone		impedance is "High".
407B-Microphone		rating impedance is 150 ohms
(200 ohms actual).
Load lmpedance Range
		Minimum	Recommended
407A	. . . . . . . . . . . .15 kilohms			100 kilohms
407B	. . . . . . . . . . . . 200 ohms			1,000 ohms

Cable

1.8m (6 ft), attached, coiled cable

407A-3-conductor, 1-conductor shielded

407B-4-conductor, 2-conductor shielded

Case

Two-tone light gray and charcoal ARMO-DUR@

Dimensions

See Figure 5

A k~ M M(11161N)

2 4 M M (3/32 IN1

(2-5/81Nl

OVERALL DIMENSIONS

FIGURE 5

Net Weight

312 grams (11 oz)

Packaged Weight

510 grams (1 Ib, 2 oz)

	FURNISHED ACCESSORY
Mounting Bracket ........................		.RK6MB
	REPLACEMENT PARTS
	407A	4078
Cartridge . . .	. . . . . . . . . . . . . . . .99AN556	99AL556
Cable . . . . . .	. . . . . . . . . . . . . . . .70A3088	70A4107
Switch . . . . . .	. . . . . . . . . . . . . . . ..90A3507	90A3507

GUARANTEE

This Shure product is guaranteed in normal use to be free from electrical and mechanical defects for a period of one year from date of purchase. Please retain proof of purchase date. This guarantee includes all parts and labor. This guarantee is in lieu of any and all other guarantees or warranties, express or implied, and there shall be no recovery for any consequential or incidental damages.

SHIPPING INSTRUCTIONS

Carefully repack the unit and return it prepaid to:

Shure Brothers Incorporated Attention: Service Department 1501 West Shure Drive Arlington Heights, Illinois 60004

If outside the United States, return the unit to your dealer or Authorized Shure Service Center for repair. The unit will be returned to you prepaid.