Panasonic KX-FT932RU-B / KX-FT932CA-B / KX-FT932UA-B / KX-FT934RU-B / KX-FT934CA-B / KX-FT934UA-B Service Manual ▷ View online
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KX-FT932RU-B/KX-FT932CA-B/KX-FT932UA-B/KX-FT934RU-B/KX-FT934CA-B/KX-FT934UA-B
6.4.5.
Stepping Motor Drive Circuit
1. Function
One individual stepping motor is used for transmission and reception. It feeds the document or recording paper synchronized
for reading or printing.
for reading or printing.
2. Circuit Operation
During motor drive, ASIC IC1 pin 124 becomes a high level, and Q2 and Q1 go ON as a result. +24 V is supplied tothe motor
coil.
Stepping pulses are output from gate array IC1, causing driver IC7 to go ON. The motor coil is energized sequentially in 2
phase increments or 1-2 phase increments, which causes a 1-step rotation. A 1-step rotation is 0.13mm of recording paper or
document paper. The timing chart is below.
coil.
Stepping pulses are output from gate array IC1, causing driver IC7 to go ON. The motor coil is energized sequentially in 2
phase increments or 1-2 phase increments, which causes a 1-step rotation. A 1-step rotation is 0.13mm of recording paper or
document paper. The timing chart is below.
Stepping Motor Phase Pattern
When the motor is OFF, gate array IC1 pin 124 becomes a low level and Q2 and Q1 also turns OFF. Instead of +24V, +5V is suplied
through D501 so that the motor is held in place.
through D501 so that the motor is held in place.
Function
Mode
Phase Pattern
Speed
Copy
Fine/Photo
1-2
432 pps
Super Fine
1-2
216 pps
FAX
STD
2
432 pps
Fine/Photo
1-2
432 pps
Super Fine
1-2
216 pps
———
Paper Feed
2
432 pps
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KX-FT932RU-B/KX-FT932CA-B/KX-FT932UA-B/KX-FT934RU-B/KX-FT934CA-B/KX-FT934UA-B
6.5.
Sensors and Switches
All of the sensors and switches are shown below.
Sensor Circuit
Location
Sensor
Sensor or Switch Name
Message Error
DIGITAL
CN5
Motor Position Sensor
[CALL SERVICE]
CN6
Cutter Position Sensor (FT934 ONLY) [PAPER JAMED]
ANALOG
SW1
Recording Paper Sensor
[CHECK COVER] and [OUT OF PAPER]
SW2
Hook SW
————
SW3
JAM Sensor
[PAPER JAMED]
Operation Panel
SW39
Document Top Sensor
[REMOVE DOCUMENT]
SW38
Document Set Sensor
[CHECK DOCUMENT]
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KX-FT932RU-B/KX-FT932CA-B/KX-FT932UA-B/KX-FT934RU-B/KX-FT934CA-B/KX-FT934UA-B
6.5.1.
Motor Position Sensor
This sensor is a detection switch for recording the position of the CAM.
Digital Board
6.5.2.
Cutter Position Sensor (KX-FT934 ONLY)
Digital Board
6.5.3.
Recording Paper Sensor (SW1)
When there is no recording paper, the plate is separated from the switch lever and the switch turns off. Pin 20 of IC1 becomes a
high level. When there is recording paper, the plate pushes the switch lever and the switch turns ON. Pin 20 of IC1 becomes a low
level.
high level. When there is recording paper, the plate pushes the switch lever and the switch turns ON. Pin 20 of IC1 becomes a low
level.
Analog Board
Signal (IC1-119 Pin)
Home position
Low level
Other
High level
Signal (IC1-131 Pin)
Home position
Low level
Other
High level
Signal (IC1-20 Pin)
Paper
Low level
No paper
High level
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KX-FT932RU-B/KX-FT932CA-B/KX-FT932UA-B/KX-FT934RU-B/KX-FT934CA-B/KX-FT934UA-B
6.5.4.
Hook Switch (SW2)
When the handset is lifted, the switch turns ON, and the signal at pin 43 of IC1 becomes low.
When the handset is returned, the switch turns OFF, and the signal at pin 43 of IC1 becomes high.
When the handset is returned, the switch turns OFF, and the signal at pin 43 of IC1 becomes high.
Digital Board
6.5.5.
Jam Sensor (SW3)
The JAM sensor is a detection switch for determining whether the recording paper edge is in the correct position or not. If the
recording paper cannot be detected correctly at the JAM sensor position even when recording paper is present, then JAM is dis-
played. If the recording paper is at the sensor position, then the switch turns on the IC1-21pin switches to a high level.
recording paper cannot be detected correctly at the JAM sensor position even when recording paper is present, then JAM is dis-
played. If the recording paper is at the sensor position, then the switch turns on the IC1-21pin switches to a high level.
Analog Board
SW
Signal
ON-Hook
OFF
High level (IC1-43 pin)
OFF-Hook
ON
Low level
Signal (IC1-21 Pin)
Paper
Low level
No paper
High level
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