Bose Personalized Amplification System Sorun Giderme Kılavuzu - Sayfa 8

Amplifikatör Bose Personalized Amplification System için çevrimiçi göz atın veya pdf Sorun Giderme Kılavuzu indirin. Bose Personalized Amplification System 50 sayfaları.
Ayrıca Bose Personalized Amplification System için: Kullanıcı El Kitabı (28 sayfalar)

Bose Personalized Amplification System Sorun Giderme Kılavuzu
110V AC is changed to about 300V DC, after passing through the EMI filter and the Diode
Bridge. Then, the voltage signal is divided two ways: one DC voltage goes through the switch
control & auxiliary circuit1 again, enters into the transformer primary1. The transformer1 has five
secondary windings, the first outputs +24V DC (for the input panel), the second outputs +15V
DC (for A/D, D/A buffer circuit), the third outputs –15V DC (for A/D, D/A buffer circuit), the fourth
outputs +5V DC (for MCU and other ICs), the fifth outputs +3.3V DC (for DSP, A/D & D/A IC).
Another DC voltage goes through the switch control & auxiliary circuit2 and enters into trans-
former primary2. The transformer1 has two secondary, the first outputs -27V DC (for AMP), the
second outputs +27V DC (for AMP).
Operation of the all voltage switching regulator is more complicated. The load of +3.3V is the
heaviest, so we get this +3.3V as feedback a signal and send it to the switch control & auxiliary
circuit1. When the system works, if +3.3V happens to waver, switch control & auxiliary circuit1
will change 'open' and 'close' time of switch circuit to regulate the transformer primary1, accord-
ingly, the voltage of transformer1 secondary will keep stable. Of course, in this way, the effect of
stabilization for +3.3V is best, and that for other voltage is worse.
The regulation of the power supply for AMP is like this: we get the +27V as feedback signal and
send it to switch control & auxiliary circuit2. When system works, if +27V happens to waver,
switch control & auxiliary circuit2 will change 'open' and 'close' time of switch circuit to regulate
the transformer primary2, accordingly, the voltage of transformer2 secondary will keep stable.
When the system works, +5V can supply 100mA to MCU PCB, +3.3V can supply 260mA to
DSP PCB, +15V can supply 200mA to DSP PCB, -15V can supply 150mA to DSP PCB, and the
+24V can supply 50mA to the Input Panel PCB.
Microcontroller
A microcontroller on the MCU PCB is used for the following control functions:
Relay DSP information to Remote
Relay Remote information to DSP
Control channel volume IC
Check channel preset switch
Check bass send state
Check power & amplification protection
Check the number of bass speaker
Indicate current system working status with a three color LED
These functions are explained in detail on the next page.
THEORY OF OPERATION
8