22 23 fig.block BLOCK DIAGRAM Mar.2003 DD-20(T) DC IN INPUT B OUTPUT B BUFFER (INV) IC1B INPUT A (MONO) BATTERY RIBON 3P CN3 BUFFER Q5 BUFFER Q1 CN5 CN4 +23V +9V (JK IN/NO INPUT) DC-DC CONVERTER (STEP DOWN) IC12,Q17 DC-DC CONVERTER (STEP UP) IC11 BUFFER (INV) IC1A JACK BOARD +3.3V RIPPLE FILTER Q15 PRE EMPH/ LEVEL CTL IC3A/IC18B PRE EMPH/ LEVEL CTL IC3B/IC18A LCD DRIVER IC2 PANEL BOARD DSP IC9 CODEC AD/DA IC6 CN31,CN41 CN3,CN4 DE EMPH/ LEVEL CTL IC5B/IC18C DE EMPH/ LED DRIVER IC1 SW1-6 VR 1-4 SDRAM IC16 TR Q7 LOGIC IC15B,C RESET IC7 LCD1 (JK IN/NO INPUT) EEPROM IC10 FET SW Q6 FET SW Q8 Q4 FET SW Q3 FET SW Q2 CN2 16 PIN CN2 LED2 - 5 LED9 -12 LED13-17 LED1 ENC1 LED6 MIXER IC4A MIXER IC4A CPU IC8 CN1 16PIN CN1 (JK IN/NO INPUT) (JK IN/NO INPUT) (JK IN/NO INPUT) BUFFER IC13B BUFFER IC13A +9V LOGIC IC15A TR Q9 CTL PHONES OUTPUT A (MONO) CN1 16PIN CN1 CN2 ENC1 LED2 - 5 LED9 -12 LED13-17