Read Sharp AR-M155 (serv.man3) Service Manual online
AR-M150/M155/M155X ELECTRICAL SECTION 13 - 7
(4) Reset circuit
This circuit detects ON/OFF of the power source, and controls start/
stop of each circuit. The voltage of 3.3V in the MCU PWB is detected
by the reset IC to generate the reset signal.
stop of each circuit. The voltage of 3.3V in the MCU PWB is detected
by the reset IC to generate the reset signal.
When the power voltage reaches the specified level, each circuit is
operated, but stopped before the power voltage falls below the speci-
fied level in order to protect against malfunction of the circuit. The
CPU/Flash ROM is reset by the power reset circuit, and system reset
of ASIC, OA982, FAX, and NIC is generated from the CPU (general-
purpose port output).
operated, but stopped before the power voltage falls below the speci-
fied level in order to protect against malfunction of the circuit. The
CPU/Flash ROM is reset by the power reset circuit, and system reset
of ASIC, OA982, FAX, and NIC is generated from the CPU (general-
purpose port output).
254 ram_data6
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
255 ram_data5
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
256 ram_data4
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
257 GND_core
Power
258 ram_data3
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
259 ram_data2
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
260 ram_data1
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
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memory) data bus
261 ram_data0
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
262 GND_AC
Power
263 ram_data15
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
264 ram_data14
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
265 VCC_AC
Power
266 ram_data13
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
267 ram_data12
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
268 ram_data11
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
269 ram_data10
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
270 ram_data9
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
271 ram_data8
IN/OUT SDRAM
SDRAM (Image
process page
memory) data bus
process page
memory) data bus
272 VCC_core
Power
273 ram_dqm1
OUT
SDRAM
SDRAM (Image
process page
memory) DQM signal
process page
memory) DQM signal
274 ram_cke
OUT
SDRAM
SDRAM (Image
process page
memory) CKE signal
process page
memory) CKE signal
275 GND_AC
Power
276 ram_clk_out
SDRAM
SDRAM's clock
277 GND_core
Power
278 ram_mad12
OUT
SDRAM
SDRAM (Image
process page
memory) address bus
process page
memory) address bus
279 ram_mad11
OUT
SDRAM
SDRAM (Image
process page
memory) address bus
process page
memory) address bus
280 ram_mad9
OUT
SDRAM
SDRAM (Image
process page
memory) address bus
process page
memory) address bus
PIN
No.
Signal Name
IN/OUT Connected to
Description
281 VCC_core
Power
282 ram_mad8
OUT
SDRAM
SDRAM (Image
process page
memory) address bus
process page
memory) address bus
283 ram_mad7
OUT
SDRAM
SDRAM (Image
process page
memory) address bus
process page
memory) address bus
284 VCC_AC
Power
285 ram_mad6
OUT
SDRAM
SDRAM (Image
process page
memory) address bus
process page
memory) address bus
286 ram_mad5
OUT
SDRAM
SDRAM (Image
process page
memory) address bus
process page
memory) address bus
287 ram_mad4
OUT
SDRAM
SDRAM (Image
process page
memory) address bus
process page
memory) address bus
288 GND_AC
Power
289 cpudata15
IN/OUT CPU
CPU data bus
290 cpudata14
IN/OUT CPU
CPU data bus
291 cpudata13
IN/OUT CPU
CPU data bus
292 cpudata12
IN/OUT CPU
CPU data bus
293 cpudata11
IN/OUT CPU
CPU data bus
294 cpudata10
IN/OUT CPU
CPU data bus
295 cpudata9
IN/OUT CPU
CPU data bus
296 cpudata8
IN/OUT CPU
CPU data bus
PIN
No.
Signal Name
IN/OUT Connected to
Description
R18
11kF
21
C22
0.1u
0.1u
1
2
C23
OPEN
OPEN
1
2
R20
10kF
21
IC4
M51957BFP
NC
8
GND
4
VCC
7
NC
1
IN
2
NC
3
Cd
5
OUT
6
R19
3.3kJ
3.3kJ
21
VCC3
VCC3
/RESET0
(2-C4)
Reset IC
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