Shure SE30-2 service manual Modifications

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MODIFICATIONS

Noise Improvement for Single Inputs:

The overall signal-to-noise ratio of the SE30 may be im- proved for single-input applications by disabling the two unused input channels. This automatically reduces the noise level of the mixing circuitry without changing the gain or other characteristics of the remaining input. It is recommended that Input 1 be used and Inputs 2 and 3 dis- abled to retain the Tone Oscillator and Aux. Line Input features associated with Input 1. To disable Inputs 2 and 3, follow the procedure below.

1.Remove AC line cord and turn off all power. Remove the top cover.

2.Locate resistors R12 and R13 (33K ohms), between In- put 2 and 3 controls and their associated Lo-cut Filter switches. Disconnect resistors R12 and R13 from switches S2 and S3. Bend removed lead of resistor away from all terminals, wires, and chassis.

3.Replace top cover. During operation, set Input 2 and Input 3 controls to zero.

Response Rate Knob Removal:

To prevent inadvertent misadjustment of the Response Rate Control for applications in which a fixed setting may be established, the knob may be removed.

1.Experimentally determine the proper Response Rate Control setting for the intended application and rotate the knob to this position.

2.Remove AC line cord and turn off all power. Remove the top cover.

3. Note that the plastic Response Rate knob (K5) extends through the front panel, over the shaft of potentiom- eter R5. Insert the blade of a standard screwdriver between the rear of the knob and the shaft bushing of R5, and twist the screwdriver ¼ turn. This will slide the knob forward on the shaft partially out of the front panel.

4.Grasp the knob and pull it completely out of the front panel.

5.Push the black plastic plug supplied with the SE30 into the hole thus exposed.

6.To permit subsequent control adjustment or replace- ment of the knob, the plug may be released by remov- ing the top cover and using long-nose pliers to pinch together the locking devices on either side of the plug body.

Telephone Line Surge Protection:

When using the SE30 to feed a telephone line subject to lightning induced voltage surges, the following part (commercially available) can be installed across the Line Output terminals to provide additional protection for out- put circuit components:

Metal Oxide Varistor

General Electric Co.

Type No. V22ZA1

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Contents Models SE30 & SE30-2E Gated COMPRESSOR/MIXER Table of Contents List of Illustrations Description Temperature Range Rear Panel Battery OperationControls and Connectors Output Connections Power ConnectionsInput Connections Typical SET-UP and Operation Response Rate AdjustmentLarge Changes in Input Level Multiple InputsSimultaneous Mixed Inputs INPUT-OUTPUT Signal PathAutomatic Ducking Additional InputsFunctional Block Diagram Figure Gated Memory Control GenerationSchematic Diagram a Schematic Diagram B Schematic Diagram C Schematic Diagram D Schematic Diagram Cont’d Test VOLTAGES, P. C. Board Terminals Test VOLTAGES, Transistors B Test Voltages , Table Chassis Parts Placement Printed Circuit Board Parts Placement Printed Circuit Board Parts Placement Printed Circuit Board Parts Placement Cover Removal and Replacement Battery ReplacementLamp Replacement Printed Circuit Board Removal and ServiceEquipment Needed CalibrationGated Memory Calibration ProcedureCompression System Calibration VU Meter CalibrationStereo Synchronization Modifications Carrying Handle Assembly

SE30, SE30-2 specifications

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