Sennheiser SK 500 G2, SK 100 G2, SK 300 G2 Service Manual

Service manual

SK 100 G2 SK 300 G2 SK 500 G2

SA 280205

300

SK 100 G2 SK 300 G2 SK 500 G2

Short description

The SK x00 G2 bodypack transmitter has 8 channel banks with up to 20 preset channels (presets) and one freely adjustable frequency bank. With a switching bandwidth of 36MHz 1440 frequencies can be selected in the UHF band.

Features

• Pilot tone squelch for interference-free operation

• Mute function

• HDX compander system

• Charging contacts integrated in transmitter (does not apply to SK 100 G2)

• Backlighting of display with one keystroke

• Battery status display

• Robust metal housing

• Key-lock function

Subject to alterations

Sennheiser electronic GmbH & Co. KG • 30900 Wedemark Phone: +49 (5130) 600 0 • Fax: +49 (5130) 600 300 1/27

Safety requirements

Observe safety regulations.

Observe ESD instructions while handling electrostatically endangered components.

Only skilled persons are allowed to alter and repair. For repairs and exchanges only approved components according to the current spare parts list are allowed.

For safety and certification reasons it is forbidden to alter the product without authorisation. Otherwise, the person who has altered the product is liable for any consequential damage.

repairs/exchanges The following instructions for overhaul and testing must be followed.

In case of unusual problems please contact your Sennheiser distributor.

For safety reasons unauthorised modifications and changes are not permitted.

SK 100 G2, SK 300 G2, SK 500 G2

2/27 02/2005

Content

1 Controls and indicators..................................................................................4

2 Technical data.................................................................................................5

2.1 General.................................................................................................................... 5

2.2 AF characteristics.................................................................................................. 6

2.3 RF characteristics.................................................................................................. 7

3 Exploded view.................................................................................................8

4 Test and alignment instructions ............................................................... 10

4.1 Measuring and test equipment ....................................................................... 10

4.2 Measuring set-up................................................................................................ 10

4.3 Special service tools ........................................................................................... 11

4.4 Test table ............................................................................................................. 12

4.5 Reading out / Changing of device data via infrared adaptor.................... 15

5 Circuit diagrams........................................................................................... 17

Block diagram...................................................................................................................17

Mainboard, circuit diagram, part 1/3 .......................................................................... 18

Mainboard, circuit diagram, part 2/3 .......................................................................... 19

Mainboard, circuit diagram, part 3/3 .......................................................................... 20

RF board, circuit diagram, part 1/2..............................................................................21

RF board, circuit diagram, part 2/2..............................................................................22

Mainboard, interconnector assignment, part 1/2..................................................... 23

Mainboard, interconnector assignment, part 2/2..................................................... 24

RF board, interconnector assignment.......................................................................... 25

Mainboard, printed circuit board, solder side ............................................................26

Mainboard, printed circuit board, component side................................................... 26

RF board, printed circuit board, component side ...................................................... 27

RF board, printed circuit board, solder side................................................................27

SK 100 G2, SK 300 G2, SK 500 G2 02/2005 3/27

1 Controls and indicators

쐂





쐃

씈

쐉

쐈

쐅

Transmitter elements

쐎

쐇

쐋

쐏

쐄

쐆

쐊

쐃







Display elements

쐇



쐃 Microphone and line input

(MIC/LINE)

쐇 Antenna 쐋 Operation and battery status

indication, red LED (ON/LOW BAT)

쐏 Audio peak indication,

yellow LED (AF PEAK)

쐄 Charging contacts

(not SK 100 G2)

쐂 SET button (also save function) 쐆 / rocker button (UP/DOWN) 쐊 Battery compartment 쐎 Battery compartment cover 쐅 Unlocking button 쐈 ON/OFF button 쐉 LC display 씈 MUTE switch

쐃 Alphanumeric display of the

transmit frequency

쐇 Symbol for channel bank and

channel number

쐋 Frequency unit 쐏 7-step level display for audio

signal „AF“

쐄 „MUTE“ display (audio input is

muted)

쐂 „PILOT“ display (pilot tone

transmission is activated)

쐆 Lock mode icon (lock mode is

activated)

쐊 4-step battery status display

4/27 02/2005

SK 100 G2, SK 300 G2, SK 500 G2

2 Technical data

2.1 General

Power supply voltage __________________ 2 batteries, type mignon AA; 1.5V

or battery pack BA 2015; 2.4V

Nominal voltage ______________________ +2.4V

Operating voltage _____________________ +1.8VDC to +3.1V

Switch-off threshold

when powered by batteries _________ +1.8V

when powered by BA 2015 accupack__ +2.0V

Switch-on threshold ___________________ +2.2V

Current consumption

at nominal voltage________________ ≤170mA

with transmitter switched off _______ ≤250µA

Operating time

when powered by batteries

or accupack _____________________ ≥8 hours

Battery status indication________________ 100%, 70%, 30%, low battery

Programming interface _________________ integrated infrared interface

Temperature range ____________________ -10°C to +55°C

Dimensions in mm_____________________ 82 x 63 x 23

Weight incl. batteries __________________ approx. 200g

Compliant with

Europe _________________________CE 0682

USA ___________________________FCC ID: DMOB2EUVL

Canada ________________________IC: 2099A-G2SK

Japan _________________________R202Y2378511; R202Y2378512;

R202B2378531; R202B2378532

SK 100 G2, SK 300 G2, SK 500 G2 02/2005 5/27

2.2 AF characteristics

Audio input LINE / MIC _________________ jack socket; 3.5mm AF transmission range

Microphone_____________________ 40Hz to 18kHz (±3dB)

Japan: 40Hz to 15kHz (±3dB)

Line __________________________ 80Hz to 18kHz (±3dB)

Japan: 80Hz to 15kHz (±3dB)

AF sensitivity levels ___________________ 0 to -30dB

(also refer to input level on page 11) Compander system ___________________ Sennheiser HDX Preemphasis ________________________ HDX-dependent Input impedance

Microphone_____________________ ≥10kW Line __________________________ ≥ 1MW;

parallel 470pF, guitar-optimised Total harmonic distortion (at nominal deviation, 1kHz) ____________ ≤0.9%

Signal-to-noise ratio (referring to peak deviation) ____________ 110dB(A) via HDX system Max. input voltage (peak deviation)

Microphone_____________________ 1.8Veff (unw) Line __________________________ 2.4Veff

SK 100 G2, SK 300 G2, SK 500 G2

6/27 02/2005

2.3 RF characteristics

Modulation __________________________ Wideband FM, F8W Number of transmission frequencies (tunable in steps of 25kHz)______________ 1440 Frequency ranges in MHz _______________ 518-554

626-662 740-776 774-810 (Japan) 786-822

834-870 Number of frequency banks with preset channels (presets)

SK 100 G2 ______________________ 8 banks with 4 channels each SK 300 G2 ______________________ 8 banks with 8 channels each SK 500 G2 ______________________ 8 banks with max. 20 channels

Freely adjustable frequency bank (tunable in steps of 25kHz)

SK 100 G2 ______________________ 1 bank, 4 tunable channels SK 300 G2 ______________________ 1 bank, 8 tunable channels SK 500 G2 ______________________ 1 bank, 20 tunable channels

Switching bandwidth __________________ ≤36MHz Harmonic emissions ___________________ ≤1µW Spurious wave emissions

in the range from 47MHz to 862MHz__ ≤4nW

all other frequencies < 1GHz ________ ≤250nW Channel grid _________________________ n x 25kHz Frequency stability within temperature range ≤±10kHz Intermodulation distance (±400 kHz) at antenna distance ³10cm ______________ ≥36dB Nominal deviation _____________________ ±24kHz Peak deviation (at 1kHz) ±48kHz / Japan: <±40kHz

RF transmitting power max. at 50W _______ 30mW, +0.8dB/-3dB

Japan: 10mW, +0.8dB/-3dB

Covered bandwidth according to ETSI

at -20dBc_______________________ 140kHz

at -60dBc_______________________ 200kHz Pilot tone

Frequency ______________________ 32.766kHz ±7.6Hz

Deviation _______________________ 2kHz ± 0.5kHz Carrier signal-to-noise ratio referring to peak deviation within switching bandwidth___________________________ 75dB(A)

eff

SK 100 G2, SK 300 G2, SK 500 G2 02/2005 7/27

3 Exploded view

003

002

001

011

023

017

018

002

010

022

012

(SK 100 G2)

002

016

008

(SK 300 G2,

SK 500 G2)

014

020

019

015

007

(SK 300 G2,

SK 500 G2)

019

007

(SK 100 G2)

004

005

013

006

009

SK 100 G2, SK 300 G2, SK 500 G2

8/27 02/2005

Pos Description

001 Housing complete 002 Lens screw 003 Clamp 004 Cover, LCD 005 Cover, LOW BAT 006 Cover, infrared 007 SK 100 G2: plug right

SK 300 G2 / SK 500 G2: double charging contact

008 SK 100 G2: plug left

SK 300 G2 / SK 500 G2: single charging contact 009 Battery cover 010 Axle 011 Antenna 012 PCB RF 013 Battery case 014 PCB mainboard 015 LC display complet 016 Flat cable, 20 pin 017 Slide button, black 018 Rocker switch, black 019 Knob 020 Shielding cup 021 Label 022 Lens screw 023 Slottet nut

SK 100 G2, SK 300 G2, SK 500 G2 02/2005 9/27

+ 18 hidden pages