SONY WCS999
Service Manual

SECTION 3 ELECTRICAL ADJUSTMENTS
Note: Tool � 1/4 λ sleeve antenna

0 dBm = 1 mW, 0 dBV = 1 Vrms TX SECTION
1. Consumption Current Check Setting:
regulated dc power supply battery terminal 3 mA Set

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

battery terminal #
80 mm 80 mm BNC

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

Procedure: 1. Connect a regulated dc power supply (1.5 V) and ampere meter. 2. Check that the value of ampere meter satisfy specified value. Specified value: 70 mA to 80 mA

BNC

2. TX Frequency Confirmation Setting:

The WCS-999 is a wireless microphone system operating in the 900 MHz. This system comprises the transmitter unit and the receiver unit.

TX BASE board

frequency counter

1/4 λ sleeve antenna lead wire antenna (ANT1)

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: 912.78 MHz to 912.92 MHz CH-2: 913.68 MHz to 913.82 MHz CH-3: 914.28 MHz to 914.42 MHz

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