Electrical Adjustments; Base Unit Section - Sony SPP-SS965 Service Manual

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Operating instructions manual (91 pages)

Service manual (8 pages)

Operating instructions manual (91 pages)

Table Of Contents

Table of Contents

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6-1. BASE UNIT SECTION

• Make the set in Test mode (see page 18)

1. Checking RX I&Q Output Level

Setting:

oscilloscope

level meter

–

SSG

Procedure:

1. Place the base unit in the Continuous Receive mode (CH1,

LNA ON, 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 –31.0 to –24.0

(TYPICAL –27.0) dBV. If IC951 was replaced (there is no ID

L 13942296513

data), the output level is –31.0 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 15.

2. Checking TX Center Frequency

Setting :

• short: TP918 ↔ TP919

frequency counter

–

Procedure:

1. Short TP918 and TP919 (GND) on the BASE MAIN board in

the base unit.

2. Place the base unit in the Continuous Transmit mode (CH1,

High power).

3. Measure the ANT OUT frequency of the RF module in the

base unit using a frequency counter.

4. Confirm that the measured frequency is 903.600 MHz ±

27 kHz.

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SECTION 6