Sony WCS-880 Service manual

WCS-880

SERVICE MANUAL

Ver 1.0 2001.04

Transmitter

(WCS-880T)

SPECIFICATIONS

System

Carrier frequency 863.4 — 864.6 MHz Channel Ch1, Ch2, Ch3 Modulation FM Frequency response 100 — 15,000 Hz Output level –38 dB±4 dB (0 dB = 1 V/pa, 1,000

Output impedance Approx. 1.5 kilohms

Transmitter

Oscillator Crystal-Controlled Antenna Built-in antenna Signal processing Compressor Maximum sound pressure level

Operating voltage 1.5 V LR6 (Size AA) × 1 Battery life Approx. 20 hours

Mic input jack 3.5 mm dia. (Plug in power) Dimensions Approx.

Mass Approx. 69 g (2.4 oz) incl. battery

Receiver

Oscillator SAW resonator Antenna Built-in antenna Signal processing Expander Operating voltage 1.5 V LR6 (Size AA) × 1 Battery life Approx. 20 hours

Rec. output plug Monaural mini plug Monitor output level Approx. 2 mW at 16 ohms Earphone jack 3.5 mm dia. monaural Mixing mic. jack 3.5 mm dia. monaural Cord length Approx. 45 cm (17 Dimensions Approx. 60 × 70 × 22.5 mm (2

Mass A

Hz)

More than 114 dB

with Sony Alkaline battery LR6 (N) × 1

/8 × 29/32 inches) (W × H × D)

with Sony Alkaline battery LR6 (N) × 1

/8 × 29/32 inches) (W × H × D)

rox. 78 g (2.8 oz) incl. batter

SPL

60 × 70 × 22.5 mm (2 3/8 ×

/4 inches)

/8 ×

AEP Model

Receiver

(WCS-880R)

Supplied accessories

Electret condenser lavalier microphone (1)

Directivity Omni-directional Cord length Approx. 1.0 m (39

Dynamic earphone (1)

Cord length Approx. 0.9 m (35

Ferrite core (1)

Design and specifications are subject to change without notice.

Battery life

Sony alkaline battery LR6 (N) (not supplied) will give 20 hour continuous operation of the transmitter and receiver units respectively.

/8 inches)

/2 inches)

WIRELESS MICROPHONE SYSTEM

9-873-047-11 Sony Corporation

2001D0500-1 Personal Audio Company C 2001.4 Shinagawa Tec Service Manual Production Group

WCS-880

1. GENERAL ............................................................ 3

2. DISASSEMBLY

2-1. TX Board, VCO Board ................................................... 4

2-2. Antenna Setting............................................................... 4

2-3. RX Board, FE Board....................................................... 5

2-4. Antenna Setting............................................................... 5

3. ELECTRICAL ADJUSTMENTS

TX Section ...................................................................... 6

RX Section ...................................................................... 8

4. DIAGRAMS

4-1. Block Diagram – TX Section – ..................................... 10

4-2. Block Diagram – RX Section – ..................................... 11

4-3. Printed Wiring Boards – TX Section – .......................... 12

4-4. Schematic Diagram – TX Section – ............................... 13

4-5. Printed Wiring Boards – RX Section – ......................... 14

4-6. Schematic Diagram – RX Section – .............................. 15

5. EXPLODED VIEWS

5-1. TX Section (WCS-880T) ................................................ 17

5-2. RX Section (WCS-880R)................................................ 18

6. ELECTRICAL PARTS LIST ............................... 19

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

SECTION 1

GENERAL

WCS-880

This section is extracted from instruction manual.

Receiver unit / Récepteur / Empfänger / Ontvanger

POWER switch Interrupteur

d’alimentation (POWER) Netzschalter POWER POWER schakelaar

Approx. 45 m (150 feet) Env. 45 m (150 pieds) ca. 45 m Ong. 45 m

-a,b

-a

CHANNEL selector Sélecteur de canal (CHANNEL) Wählschalter CHANNEL CHANNEL keuzeschakelaar

-a

To the v (earphone) jack Vers la prise v (écouteur) an die Buchse v (Ohrhörer) Naar v (oortelefoon).

v (earphone) jack Prise d’écouteur (v) Ohrhörerbuchse v v (oortelefoon) aansluiting

MIX MIC jack Prise de mixage (MIX MIC) Buchse MIX MIC MIX MIC aansluiting

earphone (supplied) écouteur (fourni) Ohrhörer (mitgeliefert) oortelefoon (meegeleverd)

To the microphone jack of your video camera recorder

vers la prise de microphone de votre camescope

an die Mikrofonbuchse der Videokamera

Naar de microfoonaansluiting van uw camcorder

Features

This wireless microphone system is designed to be used with a video camera recorder, etc. By attaching the receiver unit onto a video camera recorder, etc. you can receive the sound picked up by the transmitter unit. You can enjoy vivid sound which matches the zoomed up images recorded by your video camera recorder. You can also use this system with a tape recorder as a conventional wireless microphone system to record the sound.

• The operational distance between the transmitter unit and the receiver unit can be up to approximately 45 m (150 feet). However, this distance may become shorter if there are some obstacles in between the transmitter unit and the receiver unit.

• The radio frequency can be selected so that a less busy channel can be used while the air is busy.

• Compact design featuring built-in antennas.

• The transmitter unit is equipped with a plug in power∗ type MIC jack (monaural/ 3.5 mm dia.) An optional microphone other than the supplied one can be connected to this jack.

• The transmitter and receiver units are equipped with clip type holders with the adjustable clips which can be rotated 360 degrees so that the transmitter and receiver units can be attached onto your clothes, etc.

• The receiver unit is equipped with the MIX MIC jack to which an optional microphone such as the ECM-T145 (lavalier microphone) can be connected, so that the sound transmitted from the transmitter unit can be mixed with the sound picked up by the optional microphone.

• The receiver unit is equipped with the v (earphone) jack to which the supplied earphone can be connected, so that you can monitor the sound being recorded. You can use the earphone connected to the receiver unit to monitor the subject using the transmitter unit.

• The supplied lavalier microphone has a built-in wind screen effect so that you can use the microphone in the open air without a wind screen.

* Plug in power system

The system that power is supplied directly to the microphone from the microphone jack of the connected equipment.

Transmitter unit / Emetteur / Sender / Zender

POWER switch Interrupteur d’alimentation (POWER) Netzschalter POWER POWER schakelaar

-b

To the microphone jack of your tape recorder vers la prise microphone de votre magnétocassette an die Mikrofonbuchse des Kassettenrecorders Naar de microfoonaansluiting van uw cassetterecorder

earphone (supplied) écouteur (fourni) Ohrhörer (mitgeliefert) oortelefoon (meegeleverd)

CHANNEL selector Sélecteur de canal (CHANNEL) Wählschalter CHANNEL CHANNEL keuzeschakelaar

MIC jack Prise microphone (MIC) Buchse MIC MIC aansluiting

To the v (earphone) jack Vers la prise v (écouteur) an die Buchse v (Ohrhörer) Naar v (oortelefoon).

Lavalier microphone (supplied) Micro-cravate (fourni) Ansteckmikrofon (mitgeliefert) Lavalier-microfoon (meegeleverd)

To the MIC jack vers la prise MIC an Buchse MIC Naar de MIC aansluiting

WCS-880

)

SECTION 2

DISASSEMBLY

Note: Follow the disassembly procedure in the numerical order given.

2-1. TX BOARD, VCO BOARD

TX board, VCO board

case (upper)

two screws (P2

two claws

2-2. ANTENNA SETTING

TX board

case (upper)

case (lower

cushion (lower), switc

cushion (lower), switch

antenna

case (upper) rear view

2-3. RX BOARD, FE BOARD

)

case (upper)

RX board, FE board

two screws (P2 × 6

WCS-880

two claws

2-4. ANTENNA SETTING

antenna

case (lower)

RX board

cushion (lower), switch

case (upper

case (upper) rear view

WCS-880

SECTION 3

ELECTRICAL ADJUSTMENTS

Note: Tool

• 1/4 λ sleeve antenna

Production procedure:

1. Cut about 80 mm of the outer cover at the other end of an approximately 2 meter coaxial cable (1.5D-2V or the equivalent) with a BNC connector.

80 mm

BNC

2. Pull back the outer cover and fold the wire mesh over the outside cover.

80 mm

BNC

3. Cover the folded back wire mesh (outer cover) with a tube (for example, heat shrink tube) and fasten.

BNC

4. Preparation of 1.50 - 2 V coaxial cable

Mesh

4 mm 6 mm

The WCS-880 is a wireless microphone system operating in the 800 MHz. This system comprises the transmitter unit and the receiver unit.

80 cm

BNC

0 dBm = 1 mW, 0 dBV = 1 Vrms

TX SECTION

1. Consumption Current Check

Setting:

regulated dc

power supply

+ –

Procedure:

1. Connect a regulated dc po wer supply (1.5 V) and amper e meter.

2. Check that the value of ampere meter satisfy specified value.

Specified value: 50 mA to 60 mA

2. TX OSC (12.8 MHz) Adjustment

Setting:

TX BASE board

Foot of VCO board shield case

Procedure:

1. Connect a frequency counter to the TP53 on TX BASE board and the foot of VCO board shield case.

2. Set the [RF CHANNEL] switch (SW51) to[2].

3. Adjust CT2 on the TX BASE board so that the value of frequency counter becomes 12.794 MHz.

battery terminal 3

battery terminal #

TP53

Set

frequency counter

+ –

Specified value: 12.794 ± 0.001 MHz

3. TX Frequency Confirmation

Setting:

TX BASE

board

1/4 λ sleeve antenna

lead wire antenna (ANT1)

frequency counte

Procedure:

1. Connect the 1/4 λ sleeve antenna to a frequency counter, and put the antenna by the lead wire antenna (ANT1).

2. Set the [RF CHANNEL] switch (SW51) to[1].

3. Confirm that the value of frequency counter satisfy specified value.

4. Change the [RF CHANNEL] switch (SW51) to [2].

5. Confirm that the value of frequency counter satisfy specified value.

6. Change the [RF CHANNEL] switch (SW51) to [3].

7. Confirm that the value of frequency counter satisfy specified value.

Specified values: CH-1: 863.33 MHz to 863.47 MHz

CH-2: 864.13 MHz to 864.27 MHz CH-3: 864.53 MHz to 864.67 MHz

WCS-880

audio

analyzer

AF OSC

Frequency: 1 kHz Output level: –53.7 dBV

–

MIC jack (J1)

TX BASE

board

receiver

unit

lead wire antenna (ANT1)

REC out plug

(P1)

4. TX Output Level Adjustment

Setting:

TX BASE

board

TP54

Foot of VCO board shield case

spectrum analyzer

more than 1 GHz

Procedure:

1. Solder the core wire of coaxial cable to the CP54 on TX BASE board, and the mesh to the foot of VCO board shield case.

2. Connect BNC to the spectrum analyzer.

3. Set the [RF CHANNEL] switch (SW51) to [3].

4. Adjust RV51 on the TX B ASE board so that the v alue of spectrum analyzer becomes –1 ± 2.5 dBm.

5. Change the [RF CHANNEL] switch (SW51) to [2].

6. Confirm that the value of spectrum analyzer satisfy specified value.

7. Change the [RF CHANNEL] switch (SW51) to [1].

8. Confirm that the value of spectrum analyzer satisfy specified value.

Specified values: CH-1: –1 dBm to ±2.5 dBm

CH-2: –1 dBm to ±2.5 dBm CH-3: –1 dBm to ±2.5 dBm

5. VCO V oltage Adjustment

Setting:

digital voltmeter

TP58

Set

Foot of VCO board shield case

–

6. TX Modulation Sensitivity Adjustment

Setting:

Procedure:

1. Connect an AF OSC to the MIC jack (J1) on the TX BASE board (transmitter unit).

2. Connect a 3.3 kΩ load to the REC OUT plug (receiver unit), and under this condition connect to the audio analyzer.

3. Set the [RF CHANNEL] switch (SW51) to [1].

4. Adjust RV1 on the TX BASE board (transmitter unit) so that the value of audio analyzer becomes –50 dBV.

5. Change the [RF CHANNEL] switch (SW51) to [2].

6. Adjust RV2 on the TX BASE board (transmitter unit) so that the value of audio analyzer becomes –50 dBV.

7. Change the [RF CHANNEL] switch (SW51) to [3].

8. Adjust RV3 on the TX BASE board (transmitter unit) so that the value of audio analyzer becomes –50 dBV.

Adjustment Location: TX BASE Board (See page 8)

Procedure:

1. Connect digital voltmeter to the TP58 on TX BASE board and

2. Set the [RF CHANNEL] switch (SW51) to [3].

3. Adjust CT1 on the VCO board so that the value of digital volt-

4. Set the [RF CHANNEL] switch (SW51) to [1].

5. Confirm that the value of digital voltmeter satisfy specified

6. Set the [RF CHANNEL] switch (SW51) to [2].

7. Confirm that the value of digital voltmeter satisfy specified

Specified values: CH-2: 1.4 V to ±0.1 V

the foot of VCO board shield case.

meter becomes 1.6 V.

value.

CH-1: 1.1 V to ±0.1 V CH-3: 1.6 V to ±0.1 V

WCS-880

–

regulated dc

power supply

Set

battery terminal #

battery terminal 3

Adjustment Location:

MIC jack

(J1)

– TX BASE BOARD –

(Component Side)

SW51

[RF CHANNEL]

CT2

TX OSC (12.8MHz)

Adjustment

Sensitivity Adjustment

–VCO BOARD –

CT1

VCO Voltage

Adjustment

shield case

lead wire antenna (ANT1)

– TX BASE BOARD –

(Conductor Side)

2 t 3

RV1

TX Modulation

RV2

IC51

RV3

Q50

TX Output Level

TP53

RV51

Adjustment

RX SECTION

1. Consumption Current Check

Setting:

Procedure:

1. Connect a regulated dc power supply (1.5 V) and ampere meter .

2. Set the [RF CHANNEL] switch (SW1) to [1].

3. Check that the value of ampere meter satisfy specified value.

Specified value: 50 mA to 65 mA

2. RX Frequency Adjustment

Setting:

FM RF SSG

Carrier frequency: 863.4 MHz Modulation: 1 kHz, Output level: – 60 dBm

antenna (ANT1)

digital voltmeter

lead wire

1/4

antenna

20 kHz deviation

–

Foot of VCO board shield case

sleeve

to TP51

RX BASE

board

oscilloscop

(DC range)

CP54

TP58

Foot of VCO board shield case

Procedure:

REC out plug (P1)

1. Connect the 1/4 λ sleeve antenna to a SSG, and put the an-

tenna by the lead wire antenna (ANT2).

2. Connect a digital voltmeter to the TP51 on RX B ASE board and the foot of FE board shield case.

3. Connect REC out plug (P1) to an oscilloscope.

4. Set the [RF CHANNEL] switch (SW1) to [1].

5. Adjust CT1 on the RX BASE board so that the value of digital voltmeter becomes 1.4 V.

6. Confirm that the waveform of oscilloscope is sine wave.

7. Change the carrier frequency of SSG to 864.2 MHz.

8. Change the [RF CHANNEL] switch (SW1) to [2].

9. Adjust CT2 on the RX BASE board so that the value of digital voltmeter becomes 1.4 V.

10. Confirm that the waveform of oscilloscope is sine wave.

11. Change the carrier frequency of SSG to 864.6 MHz.

12. Change the [RF CHANNEL] switch (SW1) to [3].

13. Adjust CT3 on the RX BASE board so that the value of digital voltmeter becomes 1.4 V.

14. Confirm that the waveform of oscilloscope is sine wave.

Adjustment Location: RX BASE Board (See page 9)

+ 16 hidden pages

Sony WCS-880 Service manual

TABLE OF CONTENTS

GENERAL

DISASSEMBLY

TX board, VCO board

2-2. ANTENNA SETTING

RX board, FE board

2-4. ANTENNA SETTING

ELECTRICAL ADJUSTMENTS

TX SECTION

RX SECTION