Sennheiser SK 500 G2 Manuel d'utilisateur télécharger pdf (Page 13)

SK 100 G2, SK 300 G2, SK 500 G2

02/2005 13/27

3 RF module

See “Measuring set-up” page 10.

Removing the RF module:

1. Loosen the lens-head screw on the RF PCB (see exploded view, pos. 22).

2. Remove the RF module (maintain the motherboard connection via flat ribbon cable).

Re-establishing the ground connection between RF module and motherboard:

Connect the M6 point on the component side of the RF PCB and the P4 point on the component side of the motherboard.

For this purpose, solder a stranded wire with a length of 10cm between the points M6 and P4.

3.1 Supply voltage RF

PCB

Supply +2.4 V

via

battery contacts

„POWER“ = ON;

(press button for approx.

3 seconds)

RF module

TP72/GND

+5.1V

+5.35V

See page 27

3.2 Transmission

frequency

See 3.1 Pilot = „OFF“

Mute = Aus

Without

antenna at

TP8/ direkt

ground GND

Transmission

frequency =

receive

frequency

±10kHz

See 3.4

Avoiding

measuring

errors

3.3 Measuring / balancing the PLL voltage

Attention

The buttons S204, S206, S202, and S208 on the motherboard may be damaged, if you press them using sharp-edged or

pointed objects (e.g. the tip of a ballpoint pen). Only use objects with end-rounded tips that will not damage the buttons.

3.3.1 Centre range limit See 3.1 Use „TUNE“ to set the

centre transmission

frequency

TP3 +2.5V

+2.9V

Balancing via

C114

3.3.2 Lowest range limit See 3.1 Use „TUNE“ to set the

lowest transmission

frequency

TP3 +0.9V

+2.3V

Balancing via

C114

3.3.3 Uppermost range

limit

See 3.1 Use „TUNE“ to set the

uppermost transmission

frequency

TP3 +2.9V

+4.2V

Balancing via

C114

3.4 Measuring / balancing the RF output power

How to avoid measuring errors:

1. Desolder the antenna before starting the measurement.

2. Measure against a direct ground point on TP8.

3. Only use shielded measuring lines with an impedance of 50O and a length of 50cm.

3.4.1 Mean RF output

power

See 3.1 Spectrum analyser or

power measuring device;

set centre transmission

frequency (ft=fm)

Without

antenna to

TP8 / direct

ground GND;

Japan: J200

test socket

15mW to

38mW /

12dBm to

15.8dBm

Japan: 5mW to

10mW / 7dBm

to 10dBm

–

3.4.2 Highest RF output

power

See 3.1 Spectrum analyser or

power measuring device;

set highest transmission

frequency (ft=fh)

3.4.3 Lowest RF output

power

See 3.1 Spectrum analyser or

power measuring device;

set lowest transmission

frequency (ft=fl)

3.5 Nominal deviation

LINE

AF generator at jack

socket (1kHz, 270mV)

Set „SENSIT“ to -10dB See 3.4.1 < ±24kHz Pay attention

to the pin

assignment of

the jack socket:

See “Measu-

ring set-up”

page 10.

3.6 Peak deviation LINE AF generator at jack

socket (1kHz, 1.08V)

Set „SENSIT“ to -10dB See 3.4.1 < ±4kHz

Japan:

±40kHz

3.7 S/N ratio referring

to peak deviation

24kHz

Mod: OFF

AF level meter

MUTE= „ON“

See 3.4.1

≤ 60dB(A)

eff

–

3.8 THD at nominal

deviation

See 3.4 AF level meter

THD measuring

Mod: ON

See 3.4.1 0.08% to 1.2% –

Se-

quence

Type of measure-

ment/adjustment

Signal input Device settings Mesuring

point/ test

point

Required

value

Remarks

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 26 27

Commentaires sur ces manuels

Pas de commentaire

Sennheiser SK 500 G2 Manuel d'utilisateur Page 13

Commentaires sur ces manuels

Produits connexes et manuels pour Non Sennheiser SK 500 G2