Kirisun FP520, Service Manual

Page: 15 / 64

FP520 Service Manual
Page 14 of 64
90 VOL_DET I digital potentiometer detection pin
91 NC - NC
92 GND I GND
93 PF I extension key detection pin
94 GND - Gnd
95 HEADPHONE_DET I NC
96 VREF - +5V
97 AVCC - +5V
98 GPS_C O GPS power control pin
99 BASSBAND_C O power time-delay control pin
100 BEEP_C O BEEP control pin
Chart 3.4 Semiconductor Device Function Description
Position No. Item No. Function Description
U1 SCT3252 4FSK baseband processing chip
U6 WM8758B stereophonic encoder-decoder
IC202 PST9140NR MCU reset circuit
U300 MB15E03 frequency synthesizer
IC600 NJM2904 APC
，
voltage comparison, drive
IC700 GT3136 the second local oscillation, the second intermediate frequency
amplification, amplitude limiting, demodulation, noise amplification
IC204 NJM2902 demodulation signal amplification, filter
IC2 M30620 MCU
IC200 AT24C512C E
2
PROM
，
stores channel frequency data, function setting parameter,
modulating status parameter
U800 TDA2822 receiver audio power amplification
Q302 2SK508NV receiver VCO oscillator pipe
Q304 2SC5108 VCO buffer amplifier
Q305 DTA143TE transmitter VCO control switch
Q301 2SC5108 feedback loop amplifier
Q306 DTA143TE transmitter VCO control switch
Q308 2SC4617 VCO power filter
Q303 2SC5108 VCO buffer amplifier
Q300 2SC5108 receiver the second local oscillation amplifier
Q307 2SK508NV transmitting VCO oscillator pipe
Q601 RD01MUS1 transmitter power amplifier drive
Q600 RD07S2B transmitter the last stage power amplifier