XE-A101 (serv.man3). XEA101 Service Manual (Exc Parts, CCT Diags) - Sharp ECR Service Manual (repair manual). Page 7

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4) REWIND MOTOR
When the rewind motor  is driven by the signal of the CPU.
5) DRAWER
DRAWER OPEN signal :Output high signal about 50ms
6) DETECTING "LOW VOLTAGE"
Values obtained by AD conversion and averaging
Register value: 138 (  2.7V) or less
 No voltage
139 - 154 (  2.7V - 3.0V)
 Low voltage
more than 154
 OK
7) DESTINATION DETECTION port
V version
P66
L
5ms 10ms
15ms
PRINTER 
MOTOR
REWIND
MOTOR
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