Sennheiser HE 60 User Manual download pdf (Page 9)

HEV 70

03 / 94 – 9

NOTES:

No. Measurement,

adjustment

Signal input Preparations, settings Test point Desired value Adjuster Remarks

1 Current

consumption

AF signal generator to

J1 (R and L channel):

200 mVeff / 1 kHz

Switch S1 "ON"

volume control

R104.1 and R104.2 "cw";

DC ammeter

Input

current

210 - 230 mA

(minimum)

R128 LED D29 "red"

1.1 Operating voltage as 1. as 1.;

DC voltmeter

TP1 24 - 28 VDC

2 Reference voltage as 1. as 1.;

DC voltmeter

MP1 5.1 VDC

3 Converter

frequency

as 1. as 2.;

Oscilloscope

MP2 > 60 kHz please see

pattern on

page 7

4 Operating voltage

+ 600 V

as 1. as 2.;

DC voltmeter

MP3 580 - 600 VDC

4.1 Operating voltage

+ 10 V

as 1. as 2.;

DC voltmeter

MP4 10 VDC

4.2 Operating voltage

– 10 V

as 1. as 2.;

DC voltmeter

MP5 – 10 VDC

4.3 Output stage

bias voltage

as 1. as 2.;

DC voltmeter

MP6 (+R)

MP7 (–R)

MP8 (–L)

MP9 (+L)

300 ± 15 VDC

5 Polarisation

voltage

as 1. as 2.;

DC voltmeter

MP10 255 VDC

6 AF amplifier as 1. as 2.;

UPM 550 - 1 and

Oscilloscope

MP11 (R)

MP12 (L)

190 - 200 mVeff

6.1 AF amplifier as 1. as 2.;

UPM 550 - 1 and

Oscilloscope

MP13 (R)

MP14 (L)

190 - 200 mVeff

6.2 Output voltage if outputs are clipping

decrease AF signal

generator voltage

down to 180 mVeff

as 2.;

UPM 550 - 1 and

Oscilloscope

MP15 (+R)

MP16 (–R)

MP17 (–L)

MP18 (+L)

180 - 200 Veff Output voltage

is not clipping

7 THD as 6.2. as 2.;

UPM 550 - 1 and

Oscilloscope

MP15 (+R)

MP16 (–R)

MP17 (–L)

MP18 (+L)

k < 0.3 %

8 Frequency

response

AF signal generator:

60 mVeff / 1 kHz

as 2.;

set indicated value to

reference level, adjust

UPM 550 - 1 to 0 dB

(Uncal. - Adjuster)

MP15 (+R)

MP16 (–R)

MP17 (–L)

MP18 (+L)

U = 0 dB LED D29

"green"

8.1 Frequency

response

Check frequency

response with

AF signal generator

from 20 Hz to 20 kHz

MP15 (+R)

MP16 (–R)

MP17 (–L)

MP18 (+L)

– 2 ... 0 dB

6. TEST AND ALIGNMENT INSTRUCTIONS

Download v. www.rainers-elektronikpage.de ; gescannt von Rainer Fredel

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Sennheiser HE 60 User Manual Page 9

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