Sharp PR-45M Service Manual page 5

STROBE No. DOT No. Dots/Strobe
577 ∼ 864
/STROBE4
433 ∼ 576
/STROBE3
289 ∼ 432
/STROBE2
1 ∼ 288
/STROBE1
4) Motor block diagram
/RPFA, /JPFA
/RPFB, /JPFB
/RPFC, /JPFC
/RPFD, /JPFD
VRCOM, VJCOM
VRCOM, VJCOM
<JOURNAL MOTOR>
PIN SIGNAL
No. NAME
1
VJCOM COMMON voltage
2
JOURNAL-side paper feed motor phase A
3 /JPFA
driving signal
JOURNAL-side paper feed motor phase B
4 /JPFB
driving signal
JOURNAL-side paper feed motor phase C
5 /JPFC
driving signal
JOURNAL-side paper feed motor phase D
6 /JPFD
driving signal
<RECEIPT MOTOR>
PIN SIGNAL
No. NAME
1
VRCOM COMMON voltage
2
RECEIPT-side paper feed motor phase A
3 /RPFA
driving signal
RECEIPT-side paper feed motor phase B
4 /RPFB
driving signal
RECEIPT-side paper feed motor phase C
5 /RPFC
driving signal
RECEIPT-side paper feed motor phase D
6 /RPFD
driving signal
The paper feed motors are stepping motors with 4-phase driving
coils. The motors are driven by switching over the driving coils.
<MOTOR DRIVE SEQUENCE> ON: Energized/OFF: Not energized
JOURNAL MOTOR
STEP No. PHASE A PHASE B
1 ON OFF
2 ON OFF
3 OFF
4 OFF
RECEIPT MOTOR
STEP No. PHASE A PHASE B
1 ON OFF
2 ON OFF
3 OFF
4 OFF
Note
Excluding dots No.1 ∼ 88,
288
377 ∼ 488 and 777 ∼ 864
144
144
288
stepping motor
B A
C
M
D
DESCRIPTION
DESCRIPTION
PHASE C PHASE D
OFF ON
ON OFF
ON ON OFF
ON OFF ON
PHASE C PHASE D
ON OFF
OFF ON
ON OFF ON
ON ON OFF
5) End sensor block diagram
reflex photo sensor
+5V
0.1µF
/RPES, /JPES
GND-L
SIGNAL NAME
+5V +5V
/RPES Receipt paper end sensor detecting signal
/JPES Journal paper end sensor detecting signal
GNDL GND
The photo diode on the PWB detects the presence/absence of the
paper passing under the journal and receipt platens.
6) Head up sensor
PHUPS
GND-L
SIGNAL NAME
PHUPS Head-up detecting signal
GNDL GND
The micro switch at the left side of the printer detects the head-up
state.
ON: Head-down
OFF: Head-up
3 4
2 1
39KΩ 220Ω
DESCRIPTION
micro switch
DESCRIPTION