BBK MA700S free download

File name Bbk-MA700S pwramp.pdf

MA-700 Service manual MA-700 Principle and Servicing 1. Unit circuit principle MA700 is a middle-level active speaker, which is composed of a subwoofer speaker, two front satellite speakers, two surround speakers and a centre speaker and with excellent sound effect. It has the following features: Ўф2.1/5.1CH output; ЎфBuilt-in 5CH power amplifying, adaptable to AC-3/DTS and stereo music replay; ЎфWith 6CH volume control and separate level control, and with tone adjustment function. (1) PCB board composition figure of the player The player includes input board, output board, power amplifier board and control panel, in which, input board and output board are comprised of several terminals; the main part is power amplifier board, control, amplifying part of the player and power supply are all included on it. PCB board composition figure of the player is shown as the following figure 1.1.1: CIRCUIT CONNECTION DIAGRAM 1.~14V 2. 0 XS1 3.~14V POWER AMPLIFYING BOARD OUTPUT BOARD 1. GND 1. GND 2. GND 2. GND 3. C 3. C INPUT BOARD XS4 4. SR 4. SR XP4 1. L 1. L 1. SW 1. SW 2. R 2. R 2. SR 2. SR 3. SL 3. SL 3. SL 3. SL XP2 4. C 4. C XS2 1. R 1. R 2. L 2. L XS3 3.GND 3. GND SW SPEAKER XP3 SW FRONT PANEL'S BOARD Figure 1.1.1 PCB board composition figure of the player -1- (2) Principle block diagram of the player The principle block diagram of the player is shown as in the following figure 1.2.1: signals arrive at electronic volume and tone adjustment circuit through input terminal for tone and volume adjustment, and then are sent to power amplifying circuit for amplifying output. The inform