Service manual

FO-4400U
FO-CS1
5 – 10
LC24199B-WJ0-E (IC21) Terminal description (2/2)
6) SM8578BV (IC22): pin-8, SOP (Real time clock IC)
It is oscillated with the quartz oscillator of 32.768 kHz, and the clock and
calendar functions are provided.
Even if the power supply of the main body is turned off, it is backed up
with lithium battery (BAT1).
This device executes the clock-synchronous type serial communication
with the Sub ASIC, and CPU can know the time and date through the
Sub ASIC.
PIN I/O Name Function PIN I/O Name Function
105 P VSS Ground 157 P VSS Ground
106 I SDDCT 158 I A3 Address bus
107 I DPANIC0 Address bus for NIC board 159 I A2 Address bus
108 I DPANIC1 Address bus for NIC board 160 I A1 Address bus
109 O DPANIC2 Address bus for NIC board 161 I A0 Address bus
110 P DPANIC3 Address bus for NIC board 162 I XWE Write strobe signal from COSMOS
111 O DPANIC4 Address bus for NIC board 163 I RXW Read/Write Signal
112 O DPANIC5 Address bus for NIC board 164 I XRD Read strobe signal from COSMOS
113 O DPANIC6 Address bus for NIC board 165 B D15 Data bus
114 O DPANIC7 Address bus for NIC board 166 B D14 Data bus
115 O DPANIC8 Address bus for NIC board 167 B D13 Data bus
116 P DPANIC9 Address bus for NIC board 168 B D12 Data bus
117 P DPANIC10 Address bus for NIC board 169 B D11 Data bus
118 I DPANIC11 Address bus for NIC board 170 B D10 Data bus
119 I DPANIC12 Address bus for NIC board 171 B D9 Data bus
120 I VDD Power supply 172 P VDD Power supply
121 O VSS Ground 173 P VSS Ground
122 N.C Not connect 174 B D8
123 P DPANIC13 Address bus for NIC board 175 B D7
124 P DPANIC14 Address bus for NIC board 176 B D6
125 P DPANIC15 Address bus for NIC board 177 B D5
126 O DPANIC16 Address bus for NIC board 178 B D4
127 O XCSNICIN 179 B D3
128 I GPIO4 PWSAVE: Powr save control for PS-unit 180 B D2
129 I GPIO5 LEDON: Light ON/OFF for LED in CIS 181 B
130 I GPIO6 VPPCN: VPP control of nor flash memory 182 B
131 I GPIO7 XWP: Write protect for nor flash memory 183 N.C Not connect
132 I XNICACK Acknowlede signal for NIC 184 O INTR
133
I
XROLSNS Roller position sensor 185
IX
RESET
134 I XORGSNS Document sensor 186 I TEST Test pin
135 I XFRSNS Front sensor 187 O RTCCE Chip select (RTC)
136 B XB4FRS B4 width sensor 188 O RTCCK Serial communication clock (RTC)
137 B PLNGON Plunger contorl signal 189 B RTCDT Serial communication data (RTC)
138 B VDD Power supply 190 P VDD Power supply
139 B VSS Ground 191 P VSS Ground
140 P External bus Clock(33.3MHz) 192 O
141 P Chip select signal 193 O
142 B A16 Address bus 194 O
143 B A15 Address bus 195 O
144 B A14 Address bus 196 O
145 B A13 Address bus 197 O
146 B A12 Address bus 198 O
147 B A11 Address bus 199 O Buzzer signal
148 B A10 Address bus 200 O
149 B A9 Address bus 201 O Reserved for 200V
150 B A8 Address bus 202 O DPMUTE1
151 B A7 Address bus 203 O
152 B A6 Address bus 204 O TXMUTE1 Mute control for TX signal
153 B A5 Address bus 205 O DPON1 Active choke control
154 O A4 Address bus 206 O MONSEL Monitor select/DC character measured
155 N.C Not connect 207 N.C Not connect
156 P VDD Power supply 208 P VDD Power supply
—
SD DICT in
—
Chip select of NIC in FAX mode
SHCLK
XCS
—
CML relay control signalCML1
Reserved for 200V
ERLY1
Reserved for 200V
GAINC1
BZOUT
Speaker mute control signal
SPMUTE
Speaker volume control signal
VOLC
Speaker volume control signal
VOLB
Speaker volume control signal
VOLA
Change control of sound sourceBZCONT
Reset signal for modem chip 0
XMDMRST0
Reset signal for modem chip 1
XMDMRST1
Reset signal
Interrupt request signal
—
Data busD0
Data bus
D1
Data bus
Data bus
Data bus
Data bus
Data bus
Data bus
Data bus