HYT TM-800K, Service Manual

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TM-800K Service Manual
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48 P44 CS0 O Signal select (expansion chip)
49 A19 A19 O NC
50-59 A18-A9 A18-A9 O FLASH ROM address bus
60 VCC VCC I +5V
61 A8 A8 O FLASH ROM address bus
62 VSS VSS I GND
63-70 A7-A0 A7-A0 O FLASH ROM address bus
71 P17 8RC O 8R power supply control RX: H
72 P16 8TC O 8T power supply control TX: H
73 P15 RX O TX/RX VCO switch RX: L
74 P14 EEPDAT I/O EEPROM data input/output
75 P13 EEPCLK O EEPROM clock output
DACLK O DA clock output
76 P12 PLLUL I PLL unlock detect Unlock: L
77 P11 PLLSTB O PLL strobe output Lock: L
78 P10 AFMUTE O AF Mute (RX) Mute: H
79-86 D7~ D0 D7-D0 FLASH ROM address bus
87 P10 PWR I [PWR] key input On: L
88 P10 IGN I Ignition sense input H: off L: on
PLLDAT O PLL data output
89 P10
DADAT O DA data output
90 P10 PLLCLK O PLL clock output
91 AN3 TEMP I Temperature input
92 AN2 RSSQL I RSSI input
93 AN1 ANLSQL I SQL input (analogue)
94 AVss AVss I GND
95 AN0 TI I CTCSS/CDCSS signal input
96 VREF VREF I Reference voltage input
97 AVCC AVCC I GND
98 P97/Sin4 AUX8 O WDI
，
Reset IC Input
99 P96/Sout4 DTMFCLK O DTMF chip decode clock output
100 P95/Clk4 DTMFDAT I DTMF chip decode clock input
Component Description
1. TX-RX Unit
Ref. No. Part Name Type Description
IC102 IC Power module Power module
IC103 IC AT29C02-90T1 Flash ROM
IC104 IC NJM2904V Single-supply dual operational amplifier
IC105 IC AT2408N12.5S EEPROM
IC106 IC AK2346 Audio processor