Electro-Voice E-V 1144A Bedienungsanleitung

ELECTRONICS SERVICE MANUAL

E-V 1144A SOLID STATE AMPLIFIER

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ELECTRO-VOICE INC., BUCHANAN, MICHIGAN 4S1Q7

INDEX

I. INTRODUCTION

A. Specifications &Description

B. Features

C. Control Functions

D. Preparing for Operation

II. DISASSEMBLY

III. REPLACING LAMPS &FUSES

IV. TROUBLE SHOOTING CHART

INTRODUCTION

This service manual was designed with the technician in

mind. It has been kept as brief as possible without over-

simplification. AH procedures are presented in adear step-

by-step manner. Although we have tried to anticipate all of

your problems and questions, in special instances you

may need additional guidance. Address any such inquiries

to our Technical Service Department

DESCRIPTION

Representing an entirely new and unique approach to the

design of stereo high fidelity components, the Electro-

Voice E-V 1144A stereo control amplifier incorporates

the latest "state of the art" transistor circuitry in an ex-

quisitely styled, remarkably small package. Despite its

small size, the E-V 1144A delivers 65 watts IMF music

power with low distortion.

In addition to superb styling and performance, the

E-V 1144A amplifier offers' many operating conveniences.

Acolor-coded volume control allows simple op>eration,

even by those unfamiliar with component stereo. Colorful

indicator lights show at aglance the program source

selected. The front panel stereo headphone jack is live at all

times, v^ile aspeaker mute switch allows the speakers to

be disabled at will without affecting headphone operation.

FIGURE 1

The sheets are punched to fit athree-ring binder so that

any production changes and additional service tips can be

easily added. This will keep your Electro-Voice Service

Data as up-to-date as possible.

SPECIFICATIONS

POWER OUTPUT

IMF Music Power: 65 watts into 4ohms

50 watts into 8ohms

Continuous Sine Wave: 18 watts per channel

FREQUENCY RESPONSE: +1 .5 db.20-20,000 Ha at rated

output

tl.5 db, 20-30,000 Hz at 1watt

HARMONIC DISTORTION: Less than 1.0%at rated output

HUM and NOISE

High Level Inputs: Better than 70 db below rated output

Magnetic Phono Input: Better than 60 db below rated output

CHANNEL SEPARATION; 40 db minimum at 1,000 Hz

INPUTS: Mag Phono—Turter—Aux—Tape

(high level)

INPUT SENSITIVITY

Phono: 3mv

Tuner,Aux,Tape: 150 mv

CONTROLS (ROTARY)

Bass; -flOdb,—12 db at 50 Hz

Treble: +10db,-12 db at 10,000 Hz

Selector: Phono—Tuner—Aux

Balance:

Volume: With On/Off Switch

CONTROLS (SWITCHES)

Mode: Stereo/Mono

Tape Monitor: Source/Tape

Loudness: On/Off

Speaker: On/Mute

OUTPUTS

Speakers: 4—16 ohms per channel

Stereo Tape Recorder

Stereo Headphones; On front panel

OUTPUT DAMPING FACTOR: one switched

one unswitched

POWER REQUIREMENTS; 110-120 volts

50—60 cycle AC

01 MENSI ONS: 3-3/8" high,8-3/8" wide, 10-1/4" deeo

Page 1

FEATURES

LOUDNESS CONTROL: Compensates for decreased ef-

ficiency of the human ear to low frequencies at low

listening levels. Only in effect below 12 o'clock position

of volume control.

SPEAKER MUTING SWITCH: Disables speakers for head-

phone listening. Output is available at the headphone

jack regardless of muting switch position.

COLORED INDICATOR LIGHTS: Show the input source

selected—phono, tuner, auxiliary.

CONTROL FUNCTIONS

TAPE/SOURCE: Selects either tape (high level) or Inputs

controlled by selector switch. Allows you to monitor

what has actually been recorded on tape.

STEREO/MONO: Allows either two-channel amplifica-

tion of stereo signal source or combines input signals for

monophonic reproduction through both speakers. Mono-

phonic input plays back through both speakers with

switch in mono position.

SPEAKER MUTE; Permits either simultaneous head-

phone and loudspeaker or headphone listening only.

LOUDNESS: Causes volume control to automatically

boost bass at low setting which compensates for hearing

deficiencies at low levels.

SELECTOR; Allows choice of signal source—phono, tuner,

or other high level source (auxiliary).

BASS; Approximately 12 db boost and 16 db cut at 50

Hz (both channels) to compensate for speaker system

characteristics and listening preference.

TREBLE: Approximately 12 db boost and 16 db cut at

10,000 Hz, both channels.

BALANCE: Allows choice of left or right speaker opera-

tion and provides method of compensating for other

system imbalances.

VOLUME-OFF/ON: Controls listening level and, when

used in conjunction with loudness control, maintains

natural sound balance even at low volume levies.

PREPARING FOR OPERATION

Be sure power switch (on volume control) is "off"

before plugging amplifier into wall outlet supplying

115-120 volts AC.

2. Connect left and right channel speakers at ter-

minal block using diagram printed on bottom of

amplifier. NOTE: AVOID SHORTING SPEAKER

TERMINALS TO KEEP FROM BLOWING OUT-

PUT FUSES.

3. Connect outputs from tape recorder, turntable or

changer and tuner to corresponding input jacks.

4. Set tape/source switch to source position and turn

selector to appropriate input Note: if tape player

is used, put tape/source in tape position.

5. Turn unit or b/ advancing volume control until a

click is heard. Advance control to acomfortable

level and set tone controls at approximately 12:00.

6. Set balance control for equal output from both

speakers.

7. Check speaker phasing by reversing leads to one

speaker while standing mid-way between and in

front of the speakers. The stereo/mono switch

should be in the mono position for this check. Make

final speaker connection with the polarity that de-

livers fullest bass and causes the sound to appear to

come from the area between the speakers.

Page 3

DISASSEMBLY

REMOVING BLACK METAL COVER

Remove phillips head screws in rear of cabinet.

(See Figure 2below)

FIGURE 2

Slide cover back and remove.

REMOVING WALNUT END PANELS

3. Remove phillips screw from each panel.

(See Figure 2above)

4. Remove brass grounding strap.

5. Pull back firmly on panel to disengage metal clip.

REMOVING FRONT PANEL

6. Remove the control knobs by pulling forward.

7. Remove felt washers behind knobs.

8. Remove 2nuts from threaded studs on front panel.

(See Figure 3below)

FIGURE 3

Remove the front panel.

REPLACING LAMPS AND FUSES

REPLACING FUNCTION INDICATOR LAMPS

1. Follow Steps 1thru 9under disassembly.

2. Loosen silk tape holding fishpaper shield in place.

3. Bend shield back to gain access to bulbs. (See Fig. 4)

4. Replace defective lamp(s) and reverse steps above.

FIGURE 4

REPLACING OUTPUT FUSES IF2 &F3)

1. Follow Step 1and 2under disassembly.

2. Pry defective fuse from holder.

3. Replace with 1.5a SLO-BLO fuse and reassemble

amplifier.

REPLACING POWER FUSE IFII

1. Follow Steps 1and 2under disassembly.

2. Pry defective fuse from holder.

3. Replace with a1.5a SLO-BLO fuse and reassemble

amplifier.

PARTS IDENTIFICATION

TRANSISTORS MISCELLANEOUS

43054 Lo- Noise 17139 Phone Jack

43044 SE-6002 17137 Phono Jack (dual)

43045 SE-4002 20797 Strain Relief

43046 B10167 27258 Speaker terminal strip

76660-BX Side Panel Clip

16412 Power Cord

COMPONENTS 20893 Heat Sinks

20747 Mica Insulator

77117 Fishpaper Lamp Board

42407 2500 @25 wv capacitor 77118 Ground Strap

43067 750 @100 piv diode 43055 Bulb

15200 Driver transformer 38294 Felt Washer

15174 Power transformer A85081-ED1Front Panel

A76484 Side Panel

SWITCHES &CONTROLS A76489-JD Top Cover

A764gg-RA Lens

46415 Balance (25k)

46412 Volume (25k) KNOBS

46413 Bass/Treble (100k)

56084 Selector switch

56075 Rocker switch 76558-CX Volume On/Off

76557-CX Bass/Treble/BalarKe

7671 7-CX Selector Switch

PRINTED BOARDS

84949 PC-1 Preamp corr>plete

84950 PC-2 Driver/Powfer Amp complete

84950 PC-3 Drh/er/Power Amp complete

84951 PC-4 Power Supply complete

77116 Power Supply (board only)

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