Pioneer DEH-2800 Service Manual - Page 66

1 2 3 4 - FM/AM Tuner Unit A 76 13 5 10 9 8 11 14 18 19 20 21 NC CE2 ROM_VDD SL DI CK CE1 NC DO NC NC NC NC ← ← AM ANT 1 ATT FMRF FM ANT 3 ATT B FMRF ANT adj RF adj IC 3 EEPROM 5.0V OSC LPF IC 5 5V 3.3V IC 1 3.3V MIXER, IF AMP T51 CF52 IC 2 2.5V DET, FM MPX Rch 24 Lch 23 RFGND OSCGND DGND AUDIOGND NC VCC VDD_3.3 2 12 15 22 16 4 IC 4 3.3V 3.3V 2.5V 2.5V 17 No. Symbol I/O Explain C 1 AMANT I AM antenna input AM antenna input high impedance AMANT pin is connected with an all antenna by way of 4.7µH. (LAU type inductor) A series circuit including an inductor and a resistor is connected with RF ground for the countermeasure against the hum of power transmission line. 2 RFGND RF ground Ground of antenna block 3 FMANT I FM antenna input Input of FM antenna 75Ω Surge absorber(DSP-201M-S00B) is necessary. 4 VCC power supply The power supply for analog block. D.C 8.4V ± 0.3V 5 SL O signal level Output of FM/AM signals level 6 CE2 I chip enable-2 Chip enable for EEPROM "Low" active 7 NC non connection Not used 8 CE1 I chip enable-1 Chip enable for AF•RF "High" active D 9 CK 10 DI I clock I data in Clock Data input 11 NC non connection Not used 12 OSCGND osc ground Ground of oscillator block 13 ROM_VDD power supply Power supply for EEPROM pin 13 is connected with a power supply of micro computer. 14 DO O data out Data output 15 DGND digital ground Ground of digital block 16 NC non connection Not used 17 VDD_3.3 power supply The power supply for digital block. 3.3V ± 0.2V 18 NC non connection Not used 19 NC non connection Not used E 20 NC non connection Not used 21 NC non connection Not used 22 AUDIOGND audio ground Ground of audio block 23 L ch O L channel output FM stereo "L-ch" signal output or AM audio output 24 R ch O R channel output FM stereo "R-ch" signal output or AM audio output F 66 DEH-2800MP/XN/UC 1 2 3 4