Shure SR10 Service Manual download pdf (Page 8)

CAUTION

Similar wire colors are used in different cir-

cuits; make sure proper re-connections can

be made. Take care not to bend or break

the push-on terminals.

CIRCUIT BOARD

WIRE COLORS

NOTE:

Production variations

may

result in wire colors differ-

ing from those in the table.

Letter

Remove the four Phillips head screws from the board

and remove the board from the chassis.

Replace cover after servicing board.

Wire Color

Red

Black

Purple

Yellow/Purple

Yellow/Black

Yellow/Red

Black

Transistor and Diode Removal

All transistors and diodes used in the

SR106 are me-

chanically supported

by their leads. When replacing

these devices, proper lead configurations must be

followed. Minimum soldering heat (preferably with a

low-wattage soldering iron) should be used to avoid

damage to the device. Transistor lead codes are in-

cluded in the Notes to Circuit Diagram (Figure N).

Transistor and Diode Checking

Defective transistors and diodes may be located by

use of a standard ohmmeter such as a

Simpson 260.

Polarity of the ohmmeter must be verified before

these checks are made.

Letter

With a known diode orientation, measure the diode

resistance in the forward and reverse directions. The

lowest meter reading will establish the probe at the

cathode end (schematic symbol arrow points to ca-

thode) as the "minus" probe while the other probe

will be "plus." Some ohmmeters are not polarized in

this manner with relation to "volts plus probe" and

"volts minus probe." With the ohmmeter "plus" probe

on the anode end of a diode, and the "minus" probe

on the cathode end, the ohmmeter should read ap-

proximately 2000 ohms or less. With the meter probes

reversed, a reading of about 10,000 ohms or more

should be obtained. If either of these conditions is

not met, the diode should be replaced.

Wire Color

Red

Blue

Red

Blue

Black

White

To check transistors, the ohmmeter should be set

to the 100- or 1,000-ohm scale. Transistors and diodes

must be removed from the circuit before testing. If

all conditions in the following table are met, the tran-

sistor may be considered free of any major defect; if

any of the following conditions are not met, the tran-

sistor should be replaced. See Notes to Circuit Di-

agram (Figure

for transistor lead codes.

Ohmmeter Connections Ohmmeter Reading

NPN PNP

"Plus" Lead "Minus" Lead Transistor Transistor

Collector Emitter High High

Emitter Collector High High

Collector Base High Low

Emitter Base

Low

Base Collector Low High

Base Emitter Low

*Not a significant measurement.

Replacement Parts List

The commercial alternates shown in the following

parts list are not necessarily equivalent parts, but are

electrically and mechanically similar, and may be

used if direct factory replacements are not imme-

diately available. To maintain highest possible per-

formance and reliability, Shure Factory Replacement

Parts should be used.

Service Illustrations

The pages that follow contain a Parts Location

Drawing for the printed circuit board (Figure

and

an overall Circuit Diagram (Figure P). Foil circuit paths

are shown as shaded areas in Figure

The Circuit

Diagram shows all printed circuit board and

chassis-

mounted parts.

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 con-

sequential 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.

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Shure SR10 Service Manual Page 8

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