Icom IC-M23 Service Manual

Also see for IC-M23: Instruction manual

Contents

Icom IC-M23 Service Manual Manual pdf 11 page image

4 - 44-5 PORT ALLOCATIONS• CPU (IC360)• D/A CONVERTER (IC190)PINNo.LINENAME DESCRIPTION I/O1 BEEP Beep audio (Squarewave). O2 PS PLL power save mode control. O3 TDEC Decoded tone signal. (for monitoringpurpose) O4 DASTB Strobe for the D/A converter. O5 PLSTB Strobe for the PLL IC. O10 SDATA Serial data for the PLL IC and D/Aconverter. O11 SCK Serial clock to the PLL IC and D/Aconverter. O12 ESCK Serial clock for the EEPROM. O13 ESDA Serial clock from/to the EEPROM. I/O25 RES CPU reset. I27 TEMPV Temparature sensing voltage. I28 BTEMPV Battery temparature sensing voltage. I29 LOINV Lock voltage from the PLL IC. I30 TDETV TX power sensing voltage. I31 BATTV Battery voltage. (Divided voltage) I32 RSSIV RSSI voltage from the IF demodulate IC. I33 NOISV Noise level sensing voltage from theIF demodulate IC. I34 DCV Input voltage detection. I36 WDECV* Weather alart tone signal. I38 ATIS** ATIS signal. O51–72SEG0-SEG21 LCD driver segment terminals. O77 LEDS Backlight control. O78 CRESET Charging control IC reset. O79 LCDS LCD contrast control. O80 MICMS MIC mute SW control.L=MIC mute. O81 ATX MIC control.H=While transmitting. O85 AFVS AF power AMP control.H=While the squelch is opened. O86 V3VS VCO power supply control. O87 M3VS Main power supply control. O88 LOW TX power control.H=The TX power is set to Low. O89 R3VSR3V line control.L= W h i l e r e c e i v i n g . ( R X c i r c u i t sactivated)O90 T3VST3V line control.L= While transmitting. (TX circuitsactivated)O97 PON Main power supply line control. O98 DETMS RX AF line mute.L=Mute. O99 LEDI-RCharge status.L=While charging.Pulse=Charging error.I100 LEDI-G Charge status.L=When the battery is fully charged. I*: M24 only **: [FRG] and [HOL] onlyPINNo.LINENAME DESCRIPTION I/O101 PTTM MIC mute control.L=MIC mute. O103 PTTIN [PTT] input.H=Pushed. I106 LOW TX power control.H=TX power is set to low. O107 TXMS Transmitting control.H=TX mute. O108 16/9 [16/9] input.L=Pushed. I109 CH/WX [CH/WX] input.L=Pushed. I110 UP [Y] input.L=Pushed. I111 DOWN [Z] input.L=Pushed. I112 FAV [FAV] input.L=Pushed. I113 VOL/SQL [VOL/SQL] input.L=Pushed. I114 SCAN [SCAN] input.L=Pushed. I116 H/L [H/L] input.L=Pushed. I117 UNLKP L L u n l o c k s i g n a l i n p u t . ( P L Lmalfunction detection)H=PLL unlocked.I119 PWSW [ ] input.H=Pushed. IPINNo.LINENAME DESCRIPTION1, 2 FCON Reference frequency adjustment voltage.3, 4 PCON TX output power adjustment voltage.9, 10 MODC Deviation adjustment.11, 12 MSENS MIC signal level (MIC sensitivity) adjustment.13, 14 VOLO AF output power adjustment.15, 16 SQLO Squelch threshould level adjustment.21, 22 T1CON BPF tuning voltage.