Sharp AL-1551 (serv.man4) Service Manual ▷ View online
AL-1551 ELECTRICAL SECTION 12-8
174
SP
OUT
CCD PWB
CCD drive signal sampling hold pulse
175
GND Power
176
CP
OUT
CCD PWB
A/D conversion IC latch clock
177
BCLK
OUT
CCD PWB
CCD shield output latch signal
178
IDIN0
IN
CCD PWB
(AD conversion)
(AD conversion)
Image scan data (after 8bit A/D conversion)
179
IDIN1
IN
CCD PWB
(AD conversion)
(AD conversion)
Image scan data (after 8bit A/D conversion)
180
IDIN2
IN
CCD PWB
(AD conversion)
(AD conversion)
Image scan data (after 8bit A/D conversion)
181
IDIN3
IN
CCD PWB
(AD conversion)
(AD conversion)
Image scan data (after 8bit A/D conversion)
182
IDIN4
IN
CCD PWB
(AD conversion)
(AD conversion)
Image scan data (after 8bit A/D conversion)
183
IDIN5
IN
CCD PWB
(AD conversion)
(AD conversion)
Image scan data (after 8bit A/D conversion)
184
IDIN6
IN
CCD PWB
(AD conversion)
(AD conversion)
Image scan data (after 8bit A/D conversion)
185
5V
Power
186
IDIN7
IN
CCD PWB
(AD conversion)
(AD conversion)
Image scan data (after 8bit A/D conversion)
187
/SDCLK
OUT
CHECK
Effective image area signal
188
GND
Power
189
SFCLK
IN
Transmitter
CCD drive clock (48MHz), Also used as an internal clock.
190
TEST port 0
IN
AUTO SCAN TEST
High: Normal Low: Test
191
/SYNC
IN
LSU
Horizontal synchronization signal (HSYNC) from LSU
192
/LD
OUT
LSU
Laser drive signal
193
/LEND
OUT
LSU
Laser APC signal
194
USB-EN
OUT
GDI/USB PWB
USB port enable signal
195
1284-EN
OUT
GDI/USB PWB
1284 port enable signal
196
PORTOUT26
OUT
(Not used)
197
3.3V
Power
198
PORTOUT25
OUT
(Not used)
199
PORTOUT24
OUT
(Not used)
200
GND
Power
201
SGS
OUT
Tr array IC
SPF gate solenoid
202
SRRC
OUT
Tr array IC
SPF resist roller solenoid
203
SPUS
OUT
Tr array IC
SPF PU solenoid
204
/READY
OUT
Reserved
205
OP-LATCH
OUT
Tr array IC
Latch signal for operation circuit. Data latch at LOW.
206
MRPS2
OUT
Tr array IC
Mirror speed control signal. Mirror speed 2 at LOW.
207
MRPS1
OUT
Tr array IC
Mirror speed control signal. Mirror speed 1 at LOW.
208
SPFS
OUT
Tr array IC
SPF paper feed solenoid
209
SMSEL
OUT
Tr array IC
SPF motor/Mirror motor select signal
210
3.3V
Power
211
TC
OUT
Tr array IC
Transfer charger control signal. ON at HIGH.
212
GRIDL
OUT
Tr array IC
Main charger grid control signal. ON at HIGH.
213
GND
Power
214
MC
OUT
Tr array IC
Main charger control signal. ON at HIGH.
215
BIASL
OUT
Tr array IC
DV bias voltage control signal. ON at HIGH.
216
BIASH
OUT
Tr array IC
DV bias voltage control signal. ON at HIGH.
217
BIAS
OUT
Tr array IC
DV bias output control signal. ON at HIGH.
218
CL
OUT
Tr array IC
Copy lamp control signal. ON at HIGH.
219
VFMCNT
OUT
Tr array IC
Ventilation fan rotating speed control signal. Low speed at HIGH, high
speed at LOW.
speed at LOW.
220
VFM
OUT
Tr array IC
Ventilation fan control signal. Fan ON at HIGH.
221
LDEN
OUT
Tr array IC
Laser circuit control signal. Laser circuit ON at HIGH.
222
PMD
OUT
Tr array IC
Polygon motor control signal. Polygon motor ON at HIGH.
223
5V
Power
224
MM
OUT
Tr array IC
Main motor control signal. Main motor ON at HIGH.
225
MPFS
OUT
Tr array IC
Manual paper feed solenoid control signal. Multi paper feed ON at HIGH.
PIN No.
Signal name
IN/OUT
Connected to
Description
, !"#$%&
AL-1551 ELECTRICAL SECTION 12-9
*
The signals which are hatched are added or revised to or from AL-1000.
226
GND
Power
227
CPFS2
OUT
Tr array IC
Second cassette paper feed solenoid control signal. Second cassette paper
feed at HIGH.
feed at HIGH.
228
CPFS1
OUT
Tr array IC
Cassette paper feed solenoid control signal. One-stage cassette paper feed
at HIGH.
at HIGH.
229
TM
OUT
Tr array IC
Toner motor drive output (+)
230
TM_
OUT
Tr array IC
Toner motor drive output ( - )
231
CPUD15
IN/OUT
CPU
CPU data bus
232
CPUD14
IN/OUT
CPU
CPU data bus
233
CPUD13
IN/OUT
CPU
CPU data bus
234
CPUD12
IN/OUT
CPU
CPU data bus
235
CPUD11
IN/OUT
CPU
CPU data bus
236
5V
Power
237
CPUD10
IN/OUT
CPU
CPU data bus
238
CPUD9
IN/OUT
CPU
CPU data bus
239
GND
Power
240
CPUD8
IN/OUT
CPU
CPU data bus
241
CPUD7
IN/OUT
CPU
CPU data bus
242
CPUD6
IN/OUT
CPU
CPU data bus
243
CPUD5
IN/OUT
CPU
CPU data bus
244
CPUD4
IN/OUT
CPU
CPU data bus
245
CPUD3
IN/OUT
CPU
CPU data bus
246
CPUD2
IN/OUT
CPU
CPU data bus
247
CPUD1
IN/OUT
CPU
CPU data bus
248
CPUD0
IN/OUT
CPU
CPU data bus
249
3.3V
Power
250
/CPUWR
IN
CPU
CPU write signal
251
/CPURD
IN
CPU
CPU read signal
252
GND
Power
253
CPUCLK
IN
CPU
CPU system clock
254
GND
Power
255
TEST PORT1
IN
AUTO SCAN TEST
High: Normal Low: Test
256
/SCANST
IN
CPU(I/O)
Scanner process start signal
PIN No.
Signal name
IN/OUT
Connected to
Description
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AL-1551 ELECTRICAL SECTION 12-10
3. Reset circuit
This circuit detects ON/OFF of power to control start/stop of each circuit. The 5V voltage of the main PWB is detected by the reset IC to generate the
reset signal.
When the power voltage reaches the specified level, the circuit operations are started. Before the power voltage falls below the specified level, the
When the power voltage reaches the specified level, the circuit operations are started. Before the power voltage falls below the specified level, the
circuit operations are stopped to prevent against malfunctions.
R264 R265
IC204D
C107
IC106
C265
C264
C333
To ASIC
Rest IC
. !"#$%&
AL-1551 ELECTRICAL SECTION 12-11
4. Heater lamp control circuit
A. Outline
The heater lamp control circuit detects the heat roller surface temperature and converts in into a voltage level, which is inputted to the CPU analog input
pin.
pin.
The CPU converts the analog voltage into a digital signal level and compares it with the set value of the simulation to turn on/off the heater lamp
according to the level, maintaining the heat roller surface temperature at a constant level.
The lower the heat roller surface temperature is, the greater the thermistor resistance is, and vise versa.
Therefore, the lower the heat roller surface temperature is, the higher the thermistor terminal voltage is, and vise versa. The thermistor terminal voltage
is inputted to the CPU analog port.
is inputted to the CPU analog port.
The CPU controls ON/OFF of the heater lamp by this input voltage level.
C382
22000p
R217
7.5KJ
R221
620F
R223
10KF
R244
10KJ
R218
1MF
R220
1.2KJ
C303
22000p
22000p
R216
4.7KJ
IC201B
NJM2903
5
6
7
8
4
+
-
-
IC201A
NJM2903
3
2
1
8
4
+
-
-
IC209A
LM358
3
2
1
8
4
+
-
-
R312
300J
R273
100J
C340
0.1u
R214
1KF
R215
10KF
D109
1SS133
D108
MA700
C257
0.1u
C389
0.1u
D205
DA204K
1
2
D206
DA204K
1
2
A5V
A5V
5V
5V
12V
12V
12V
A5V
FTH
THOPEN
RTH-IN
THERMISTER SENSE CIRCUIT
AN-GND
AN-GND
AN-GND
(4-D2)
(2-E3)
(6-C1)
5V
HLOUT(6-A4)
Thermostat
Heater lamp
HLOUT
PC2
TRC1
+24V
PR-
RY1
Selector
IC202
ANo
IC108
CPU
PR
PR-
Driver
IC103
R249
120J1/4W
120J1/4W
Q204
DTA143XKA
HL-
HL
Heat
roller
roller
Thermistor
1
2
AC
Driver
IC109
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