SONY WCS880
Manual de Servicio

WCS-880

Adjustment Location:
MIC jack (J1)

RX SECTION
1. Consumption Current Check Setting:
regulated dc power supply battery terminal 3 mA Set

� TX BASE BOARD � (Component Side)
1t2t3

SW51

[RF CHANNEL]
CT2 TX OSC (12.8MHz) RV1 RV2 RV3 Adjustment TX Modulation Sensitivity Adjustment
+ �

RV51 TX Output Level Adjustment

Procedure:

battery terminal #

�VCO BOARD �

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:

CT1 VCO Voltage Adjustment shield case

digital voltmeter +

lead wire antenna (ANT1)

� TX BASE BOARD � (Conductor Side)
FM RF SSG

� Foot of VCO lead wire board shield antenna (ANT1) case

to TP51 RX BASE board

Q50
1/4 λ sleeve antenna

TP53 IC51
Carrier frequency: 863.4 MHz Modulation: 1 kHz, ± 20 kHz deviation Output level: � 60 dBm oscilloscope (DC range)

TP58
REC out plug (P1)

CP54

Procedure: 1. Connect the 1/4 λ sleeve antenna to a SSG, and put the antenna by the lead wire antenna (ANT2). 2.
Foot of VCO board shield case

3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14.

Connect a digital voltmeter to the TP51 on RX BASE board and the foot of FE board shield case. Connect REC out plug (P1) to an oscilloscope. Set the [RF CHANNEL] switch (SW1) to [1]. Adjust CT1 on the RX BASE board so that the value of digital voltmeter becomes 1.4 V. Confirm that the waveform of oscilloscope is sine wave. Change the carrier frequency of SSG to 864.2 MHz. Change the [RF CHANNEL] switch (SW1) to [2]. Adjust CT2 on the RX BASE board so that the value of digital voltmeter becomes 1.4 V. Confirm that the waveform of oscilloscope is sine wave. Change the carrier frequency of SSG to 864.6 MHz. Change the [RF CHANNEL] switch (SW1) to [3]. Adjust CT3 on the RX BASE board so that the value of digital voltmeter becomes 1.4 V. Confirm that the waveform of oscilloscope is sine wave.

Adjustment Location: RX BASE Board (See page 9)

8