Shopping cart is empty
 
English Polski Spanish 
Search For a Manual
 

(e.g. AA-V20EG JVC, ZX-7 Sony )
PayPal 1000+ rating Secure, Encrypted Checkout.
 
Who's Online
There currently are 349 guests online.
Categories
Information
Featured Product
Home >> SONY >> SPPA940 Service Manual
 
 0 item(s) in your cart 

SONY SPPA940
Service Manual


Tweet about this product and get $1.00 of store credit for instant use!
  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY SPPA940 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

Not yet ready
You must purchase it first

Customer Reviews
There are currently no product reviews.
Other Reviews
 KVX2991A SONY Service Manual by Matteo Vannini;
As Always you can find here manuals even of difficult TV scheme which are scan in almost perfect way.clear and fast!!!!! Great work thanks!
 NEMOS 32 LOEWE Service Manual by Matteo Vannini;
Incredibly clear!!!! Well done, complete and wonderful. It could not better than this!!!!
 PA-770 AKAI Service Manual by Franz Steinberger;
Thank You for fast delivery for the sheme. Everything allright. Thanks & best regards Franz
 SE9000 SAMSUNG Service Manual by Matteo Vannini;
again you did a very good job. It was fast too. Photocopy are really readable and clear
 1081 COMMODORE Service Manual by Marco Antonio Romero Garcia;
Probably it never existed a 1081 official service manual from Commodore, it's look more like a NAPCEC service manual & diagrams compilation of the 1084 series and his variants, like the nap6523, 8cm505, 1084S, 1084P and obviously the 1081. It's more complete than other scans and the quality of the scans also are far superior. It has two circuit diagrams variants of the 1081, mono and stereo versions. It doesn't include a diagram for the Philips CM8500 or CM8501, they look like the 1081 but they are slightly different.

Text excerpt from page 17 (click to view)
2.2 2.2.1

Receive Section RX Amps and SAW Filter The purpose of the first RX amp is to provide enough gain that the noise figure of the RX section is fixed to a value as low as possible. It must provide a good 50Ω match to both the RX bandpass filter and the SAW filter. This amplifier must also have good power handling capability due to the limited filtering which precedes it. The design employs a collector inductor to improve the output power capability of the transistor. This form of matching also ensures that the gain of this stage is not too wide band further improving its performance by allowing it to effectively reject signals which are far out of its passband. Directly following the first RX amp is the SAW filter. This filter is responsible for the bulk of the filtering in the receive section. It provides more than 40dB of image rejection and TX carrier suppression. The insertion loss of this filter is relatively high due to its SAW implementation. It has an insertion loss of less than 5dB, typically 4dB. An amplifier is required before this SAW filter to keep the noise figure low. If it were not present, the noise figure of the phone would increase by the 4dB Ioss associated with the SAW filter. The second RX amp provides a limited amount of gain. Its main function is to ensure that the mixer sees a good wideband match. Measuring the RX gain from the BFA connector to the output of this amplifier will produce results as shown in Figure 4 below.

925-928MHz Passband

0dB

10dB/div

875

902-905MHz Reject Band

97

Figure 4. RX Front end Response. ––––––––––––––––––––––––––––– 2.2.2 RX Mixer The function of the mixer is to combine the incoming signal with a LO signal in order to convert the desired signal to the 10.7MHz IF frequency. The mixer used for this task is a dual gate FET (CF739R). The LO and RF signals are placed on the gates of the FET and the IF signal is coupled off of the drain. The FET provides conversion gain along with adequate power handling characteristics. Both the RF and LO ports are shorted to ground by rectangular microstrip inductors. These inductors provide a high impedance at both the RF and LO frequencies while presenting a very low impedance at the IF frequency. The mixer is followed by an emitter follower which converts the high impedance output of the mixer to a 330Ω output suitable for directly driving the IF ceramic filters. The gain for the pair (mixer and follower) is about 6dB (50Ω in, 330Ω out). RX VCO and LO Buffer The RX VCO is a Colpitt’s type oscillator operating at about 450MHz with a frequency selective network tuned to about 900MHz on the collector. The frequency of oscillation is controlled by a varactor diode in the tank circuit connected to the base of the transistor. This diode is connected to the loop voltage from the RX synthesizer. Rough tuning is achieved with a variable chip cap. This capacitor is used to center the tuning voltage to ensure reliable operation over a wide temperature range and also to compensate for variations in component values. The 450MHz LO for the PLL is coupled off of the emitter of the VCO transistor. This is lightly coupled to ensure that the VCO is not loaded by the PLL. The LO Buffer isolates the PLL from the VCO preventing the TX VCO from interfering with the RX VCO and vice versa. The 900MHz RX LO signal for the Mixer is coupled off the collector of the VCO transistor. 2.2.4 RX Synthesizer The PLL and prescaler for both the TX and RX sides are combined into one IC. The Synthesizer receives channel information from the audio board through the SPI buss. It also requires a stable 4.0MHz reference which is supplied from the MCU section.

2.2.3

– 17 –

You might also want to buy

$4.99

SPP-A940 SONY
Owner's Manual

Complete owner's manual in digital format. The manual will be available for download as PDF file aft…
>
Parse Time: 0.137 - Number of Queries: 112 - Query Time: 0.028