Panasonic KX-FLM663RU Service Manual ▷ View online
33
KX-FLM663RU
6.7.3.
SCAN MOTOR DRIVE CIRCUIT
1. Functions
This motor functions for main operations including FAX transmission.
This feed document paper synchronized for reading.
This feed document paper synchronized for reading.
2. Motor operation
During motor driving, pin D8 of IC300 becomes a high level, and Q523, Q520 turns ON.
As a result, +24V is supplied to the motor coil.
Stepping pulses are output from IC300 pins, A10, B10, C10, A9, causing driver Q519 pins,
16 ~ 13 to drive the motor coil.
The motor coil is energized sequentially in 2 phase increments, which causes a 1-step rotation.
A 1-step rotation feeds 0.065mm of document paper.
As a result, +24V is supplied to the motor coil.
Stepping pulses are output from IC300 pins, A10, B10, C10, A9, causing driver Q519 pins,
16 ~ 13 to drive the motor coil.
The motor coil is energized sequentially in 2 phase increments, which causes a 1-step rotation.
A 1-step rotation feeds 0.065mm of document paper.
6.7.3.1.
TIMING CHART
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KX-FLM663RU
6.7.3.2.
SCAN MOTOR DRIVE CIRCUIT
DRIVE MODE
FUNCTION
MODE
PHASE PATTERN
SPEED
SCAN
FAX
STANDARD
2 phase
579pps
SCAN
FAX/COPY
FINE/TEXT
2 phase
579pps
SCAN
FAX/COPY
SUPER FINE/PHOTO
1-2 phase
579pps
SCAN
FAX/COPY
PHOTO/TEXT WITH
PHOTO
PHOTO
2 phase
579pps
SCAN
DOC.PREFEED/EJECT
-
2 phase
579pps
STAND-BY
-
ALL PHASE OFF
-
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KX-FLM663RU
6.8.
FAN MOTOR SECTION
This unit is equipped with a FAN to prevent the developing devices from overheating during printing.
When the output of pin A11 of IC300 becomes high level or pulse, the FAN is activated.
During the FAN rotation, the pulse signal is output from pin 2 of FAN and input to pin AC20 of IC300.
When this pulse is stopped, it is judged that FAN error occurred.
When the output of pin A11 of IC300 becomes high level or pulse, the FAN is activated.
During the FAN rotation, the pulse signal is output from pin 2 of FAN and input to pin AC20 of IC300.
When this pulse is stopped, it is judged that FAN error occurred.
6.8.1.
FAN CONTROL
The FAN rotates at high speed (Approx. 3000rpm) while printing (controlling the developing devices).
After printing is finished, FAN rotates at low speed (Approx.2200rpm) while predetermined period.
After printing is finished, FAN rotates at low speed (Approx.2200rpm) while predetermined period.
1. Full speed control
To rotate the FAN with full speed, constant high level is output from A11 of IC300. Then both Q514 and Q513 are turned on.
So 24V are output from collector of Q513. Since the FAN consumes approx. 0.1A, approx. 4V is reduced through R520. Then
approx. 20V is supplied to the FAN.
So 24V are output from collector of Q513. Since the FAN consumes approx. 0.1A, approx. 4V is reduced through R520. Then
approx. 20V is supplied to the FAN.
2. Half speed control
To rotate the FAN with half speed, pulse signal is output from A11 of IC300. Then both Q514 and Q513 repeat ON and OFF
according to the pulse duty (30KHz/12.5%). This pulse is integrated by R520 and C508 and converted to DC voltage. So
approx. 12V is supplied to FAN.
according to the pulse duty (30KHz/12.5%). This pulse is integrated by R520 and C508 and converted to DC voltage. So
approx. 12V is supplied to FAN.
Pin No.
Level
FAN operation mode
IC300 A11
High
Full speed rotation
Pulse
Half speed rotation
Low
Stop
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KX-FLM663RU
6.9.
SOLENOID DRIVER SECTION
The solenoid drive circuit controls Pick up Solenoid. The solenoid is designed to be driven 24V. The diodes protect transistors from
reverse generated voltage when solenoid is turned off.
reverse generated voltage when solenoid is turned off.
PICKUP
MODE
IC300_T25
Solenoid ON
High level
Solenoid OFF
Low level
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