Advertisement
Quick Links
Advertisement
Related Manuals for BBK AB217
Summary of Contents for BBK AB217
-
Page 1: Service Manual
ENGLISH AB217 SERVICE MANUAL... -
Page 2: Table Of Contents
CONTENTS 1 Circuit Makeup....................FUNCTIONS OF THE PINS Block Diagram....................NAME OF PINS DESCRIPTION NUMBER OF PINS DIGITAL POWER INPUT 2 Power Supply Circuit..................OSCILLATOR INPUT XI N 3 Input Circuit..................... OSCILLATOR OUTPUT XOU T SIMPLE MODE: D1 DATA INPUT 4 Volume, Tone and Balance Adjusting Circuits........... -
Page 3: Circuit Makeup
1 Circuit Makeup The Explanation For Key Components IC Sc6931P This unit's circuit can be divided into six parts. 1.1 Source Circuit Supplies power to each circuit unit. 1.2 Input Circuit Selects one of four lines of input analog signals and sends it to the rear circuit. 1.3 Volume and Tone Adjusting Circuits Adjusts master volume and treble and bass tone of input signals. - Page 4 8.3.2 Schematic Diagram of The Potentiometer R917 2.2K RPH01A B50K RPH01B 5PIN B50K R918 2.2k - 25 - - 2 -...
- Page 5 Volume adjustment, sound field processing and EQ adjustment circuits. All channel signals are sent to N402 inside which the independent volume adjustment, EQ adjustment and all sound field modes process are performed. The sound field processing and EQ adjusting circuit is mainly processing the L&R channel signals.
- Page 8 CD11C 50V1U±20%4× 7 1.5 C903,C904,C941 CD11C 50V10U±20%5× 7 2 C601,C602,C608 CD11C 16V47U±20%5× 7 2 C620,C630 CD11 35V220U±20 £ ¥ 10×15 C956,C947 DIODE 1N4004 VD912,VD914 DIODE 1N4148 VD903~VD911,VD916,VD602 VOLTAGE REGULATOR 5.1V 1/2W VD601,VD915 DIODE VOLTAGE REGULATOR 24V 1/2W VD913 DIODE TRIODE 2N5551 V901 TRIODE...
- Page 10 Front Panel's Control Board 1. A+25V passes C941 and R983 and adds an instantaneous high level at the Pin 12 of N907D when this unit gets started. According to the above characteristics, the Pin 14 sends 8.2.1 Main Parts List of The Front Panel's Control Board out a voltage which is comparatively closer to the voltage of the power supply B+23V.
- Page 11 6.2 Channel and MIC Delay Selection 8.1.2 Schematic Diagram Of The Main Power Amplifying Board The delay circuit is made up of the D triggers N908A, N908B and voltage comparers N910B, N910C, N911A. The inching switch S905 is the channel selection button in the front panel. S906 is the MIC delay selection button.
-
Page 12: Channel Selection Section
CONNECTION ¦ µ 0.6 SHAPED 20mm W38,W42,W57 CORDS FUSE TUBE T6.3AL 250V FL401,FL402 LARGE 204×80×61 AB217 CONNECT TO THE MAIN AMP BOARD RADIATOR FUSE HOLDER 0 FL401,FL402 SMALL CHIP AB207 FIX THE TRIODES V406 AND V416 TAPPING SCREW PB 3×12H COLOR ZINC 2 FOR SMALL CHIP AND LARGE RADIATOR TAPPING SCREW PWT 3×8×8 COLOR ZINC... -
Page 13: The Spectrum Analysis Section
The spectrum analysis section (Figure 9) Detailed Circuit Explanations The Power Amplifying Board We have mentioned a LEVEL signal in Chapter 4 Volume, Tone and Balance Adjusting 8.1.1 Main Parts List of The Matin Power Amplifying Board Circuits. That signal is the spectrum analysis source. It was sent to 6-band spectrum level display circuit composed of 6 voltage comparers: N911D, N911C, N911B, N912D, N912C and N912B. -
Page 14: Power Amplification And Protection Circuits
V421 through R433 and R434. When their potential differ- multi-channel switching circuit is also connected to the output of AB217. We take the R ence is beyond 0.7V, V421 is conducted and its collector's potential decreases. Finally, the channel as an ample to analyze the circuit as shown in the figure 10. -
Page 15: Power Amplification Section
V425 Relay Shut protection function. AB217 boasts its three protection functions: delay switch-on protection Outp ut End Conducted circuit, midpoint over-voltage protection circuit and short circuit over-current protection...