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SONY SPP121/124
Service Manual


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

Description of SONY SPP121/124 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 12 (click to view)
SECTION 4 ELECTRICAL ADJUSTMENTS
BASE UNIT SECTION
Note: • Apply 9V dc from regurated DC power supply. • Perform the adjustment at T3CH (28CH : 49.910 MHz) as a rule. • Set to base unit manual test mode. (Refer to page 7.) • Switch position : S302 (DIAL MODE) : P (pulse) TX SECTION ADJUSTMENT • The electrolytic capacitor (10 µF/10 V) connected TP23 (DET OUT) to TP19 (GND). (Only TX section adjustment) TX VT Adjustment Setting :
TP2 TP3 (RX GND) Carrier frequency : 49.910 MHz Modulation Deviation Output level : 1 kHz : FM 3 kHz : 60 dBµV (1 mV) (EMF)

RX SECTION ADJUSTMENT RX LEVEL Adjustment Note: • Perform the adjustment at T3CH (28CH : 49.910 MHz) as a rule. Setting :
FM RF signal generator

digital voltmeter

level meter
+ –

TP6 (TX VT) TP19 (GND)

+ –

Procedure : 1. The digital voltmeter connected TP6 (TX VT) to TP19 (GND). 2. Adjust the L52 for 2.2 ± 0.05 V reading on the digital voltmeter. RX VT Adjustment Setting :
digital voltmeter

TP105 TP104 600 Ω

PBX tester or DC 48V F.B.

+ –

TP5 (RX VT) TP3 (RX GND)

Procedure : 1. Adjust the FL101 for the maximam reading on the level meter. Also check that the output level is the specified values. Specified Value : –1.4 to –9.6 dBV RSSI Hi Adjustment Note: • Perform the adjustment at T3CH (28CH : 49.910 MHz) as a rule. Setting :
AF oscillator FM RF signal generator

Procedure : 1. The digital voltmeter connected TP5 (RX VT) to TP3 (RX GND). 2. Adjust the L101 for 2.4 ± 0.05 V reading on the digital voltmeter.

Output: 20 Hz

TP2 TP3 (RX GND) Carrier frequency : 49.910 MHz Modulation : 20 Hz (EXT) Deviation : AM 50% Output level : 17 dBµV (7.1 µV) (EMF)

oscilloscope (DC range)

+ –

TP9 (SIG OUT) TP19 (GND)

Procedure : 1. Use the oscilloscope to confirm the FM RF signal generator input (AF) signal waveform and RSSI signal, and use the RV101 so that they are synchronized (duty is synchronized).
RSSI output waveform 0V Adjust so that they synchronize at 0 V. RSSI WAVEFORM AF oscillator EXT signal 20 Hz

Adjustment Location : base main board (See page 13.)

12

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