Brother FAX-170 Service Manual page 34

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1 Connector for the CIS
1-1: Power for the CIS LED array
1-2: Clock output
1-3: Trigger signal output. One shot of this signal triggers a line of scan.
1-4: LED control signal output circuit which controls the intensity of the CIS LED ar-
1-5: Input of video data (VID) to the FAX engine
1-6: Clamp circuit that gives the bias level to the amplifier of the VID input circuit ac-
2 Connector for the thermal recording head
2-1: Power 26V for the thermal recording head
2-2: Thermister signals which are normalized by the resistor network and fed to the
2-3: Strobe signals
2-4: Data signals
2-5: Power 5V for the logic circuit of the thermal recording head
3 Connector for the motor
4 Connector for the solenoid (that switches the power transmission)
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Main PCB Circuit Diagram 3/4
ray.
cording to the CLAMP and CLPWM signals issued by the CPU (that monitors
the current video data input) for compensating the DC component of video sig-
nals for the next scan line
FAX engine
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III – 21
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