Sennheiser EM 100 G2 Wartungshandbuch PDF herunterladen (Seite 15)

EM 100 G2, EM 300 G2, EM 500 G2

15/32 08/2004

3 RF module

RF module removal:

1. Loosen the lens screw (RF board fastening, see Exploded view, Pos. 12).

2. Remove both BNC socket screws from the back panel of the unit.

3. Remove the RF module (the connection to the mainboard via the 15-pin flat cable remains).

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

Create an interference-free connection between MH3 on the RF board and 801 on the

mainboard. To do this, solder a wire approx. 10cm long between MH3 and 801.

3.1 Operating voltage

(+5V

)

+12V

at the

DC socket

Multimeter, DC RF module

Component

side: L500

+4.9V to

+5.1V

3.2 Tuning voltage measurement

1. Open the center shielded compartment on the RF module.

2. On the track, solder a piece of wire approx. 2cm long to TP17 and one to TP4.

3. Guide the wires out of the receiver as measuring lines.

4. Set the C540 trimmer in the shielded compartment to precisely 2.4V; (use TP17 and TP4 for this).

3.2.1 Mid

range limit

See 3.1 Use TUNE to set the medi-

um receiving frequency.

RF module

Solder side:

TP 17

+2.3V to

+2.5V

Alignment via

RF module,

component

side C540

3.2.2 Lowest

range limit

See 3.1 Use TUNE to set the lowest

receiving frequency.

TP 17 +0.8V to

+2.0V

–

3.2.3 Uppermost

range limit

See 3.1 Use TUNE to set the highest

receiving frequency.

TP 17 +3.0V to

+4.2V

–

3.3 Oscillator

3.3.1 1. frequency

measurement

See 3.1 Use the "SET" and "DOWN"

buttons to switch to the

mid receiving frequency;

then spectrum analyzer

TP 1 LO1=

+241MHz

–

3.3.2 1. Oscillator level See 3.1 See 3.3.1 TP 102 /

TP 202

+4.3 V Measurement

takes place in-

directly via the

voltage at the

1st oscillator

3.3.3 2. frequency

measurement

See 3.1 See 3.3.1 TP 300 230.3MHz

± 11.5kHz

–

3.3.4 2. Oscillator level See 3.1 See 3.3.1 TP 300 -20dBm to

-35dBm

–

3.4 Sensitivity,

channel 1

Set the receiving fre-

quency on the RF signal

generator:

ANT I RF: 2, 5µV; devia-

tion: 24kHz mod: off

Center frequency;

Squelch at "0";

AF level measuring device

AF output Better than

52dB(A)

–

3.5 Sensitivity,

channel 2

See 3.4 at ANT II See 3.4 AF output Better than

52dB(A)

–

3.6 THD, channel 1 RF signal generator at

ANT I RF: 1mV; deviati-

on: 24kHz mod: 1kHz

– AF output < 0.9%,

typ. 0,3%

–

3.7 THD, channel 2 See 3.4 at ANT II – AF output < 0.9%,

typ. 0,3%

–

3.8 S/N max., channel 1 See 3.4 at ANT I

Mod: off

––Better than

110dB(A)

–

3.9 S/N

max, channel 2

See 3.4 at ANT II

Mod: off

––Better than

110dB(A)

–

3.10 AF output

voltage, tuner 1

See 3.1; Mod: on,

deviation: 48kHz

with AF meter TP 6 +540mV

eff

+555mV

eff

Alignment via

R360

3.11 AF output

voltage, tuner 2

See 3.1 Mod: on,

deviation: 48kHz

with AF meter TP 8 +540mV

eff

+555mV

eff

Alignment via

R460

Sequence Type of measure-

ment/adjustment

Signal input Settings Measuring

point/test

point

Required

value

Remarks

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 31 32

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