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SONY WRT-808A
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY WRT-808A Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 25 (click to view)
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3-2-12. Battery Alarm Signal Check
Equipment and Tools DC power supply DC output Voltage: +3.0 ± 0.1 V dc DC ammeter Frequency counter Spectrum analyzer Modulation analyzer MM-SMA (J) connector (Part No. J-6402-480-A) SMA-BNC (J) connector (Part No. J-6402-490-A) Switch and Control Setting The following setting is to be perform with the channel select switches (S504 and S505). Transmitting Channel setting: U64 model: 65-01 channel (776.125 MHz) U66 model: 67-01 channel (788.125 MHz) U68 model: 69-01 channel (800.125 MHz) RF power output switch (S401): 50 mW Input LEVEL control (RV101): �_60� (0 dB attenuation) Turn the RV101 clockwise fully.

Procedure n Perform the checking with the MIC input connector (CN101) short-circuited. (1) Set the spectrum analyzer as follow: CENTER FREQUENCY (fc): U64 model: 776.125 MHz U66 model: 788.125 MHz U68 model: 800.125 MHz REFERENCE LEVEL: 20 dBm FREQUENCY SPAN: 200 kHz (20 kHz/DIV) RBW (resolution band width): 3 kHz VBW (video band width): 1 kHz ATT: 20 dB (2) Decrease gradually the DC output voltage of the DC regulated power supply and confirm that the battery alarm signal turns on at 2.0 ± 0.1 V. (3) While the TP201 is short-circuited to the frame (GND) with a tweezers etc (TONE signal ; OFF), check that level difference between carrier frequency (center frequency level) on spectrum analyzer and tone signal is with in 29 ± 1 dB.
20 dBm

1. Frequency deviation check
Connections (For connecting the DC power supply, refer to the �Preparations� on page 3-2.)
XLR 3Pin (male) - wiring side 2 Short-circuit 3 1

29 ± 1 dB

V : 10 dB/div H : 20kHz/div fc 32.782 kHz

Spectrum analyzer

Tweezers

CN402

MM-SMA (J) connector with SMA-BNC (J) connector

TP201 Frame TP201

Bridge the TP201 and frame (GND) with tweezers.

10

50

Frame

WRT-808A (U)

3-13

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