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Service Manual

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

Description of SONY SPPA957 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 29 (click to view)


3. Checking TX output Setting:
peak power meter + – ANTENNA TERMINAL

• Make the set in Test mode (see page 24) 1. Checking RX I&Q Output Level Setting:
oscilloscope + – level meter + – TP520: RXIP TP521: RXIN TP522: RXQP TP523: RXQN TP553: GND

Procedure: 1. Place the handset in the Continuous Transmit mode (CH1, High power). 2. Measure the ANT OUT output of the RF module in the handset using a peak power meter. 3. Confirm that the measured output is 62 mW (MIN 25 mW). 4. Also, execute steps 1 through 3 for the channels 10 and 20. CH10: 64 mW (MIN 25 mW) CH20: 64 mW (MIN 25 mW)



Procedure: 1. Place the handset in the Continuous Receive mode (CH1, LNA, AGC ON). 2. Set the SSG frequency to the frequency on CH1 + 300 kHz, and the RF output level to –95 dBm. 3. Measure the output level of RXIN, RXIP, RXQN, and RXQP with a level meter. At this time, confirm with an oscilloscope that a sine wave of 300 kHz is output. 4. Confirm that the measured output level is –25.0 to –19.0 dBV. If IC502 was replaced (there is no ID data), the output level is –30.0 to –24.0 dBV. 5. Also, execute steps 1 through 4 for the channels 10 and 20. * For the frequency on each channel, see page 18.

2. Checking TX Center Frequency Setting: • short: TP555 ↔ TP553
frequency counter + – ANTENNA TERMINAL

Procedure: 1. Short TP555 and TP553 (GND) on the HAND MAIN board in the handset. 2. Place the handset in the Continuous Transmit mode (CH1, High power). 3. Measure the ANT OUT frequency of the RF module in the handset using a frequency counter. 4. Confirm that the measured frequency is 903.600 MHz ± 27 kHz. 5. Also, execute steps 1 through 4 for the channels 10 and 20.

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