Panasonic KX-F1200 Service Manual And Technical Manual page 112

KX-F1200 I
[Paper Set Sensor (PS904)]
When recording paper is present, the shelter plate passes the sensor light, the phototransistor becomes ON, and the input
signal of IC401-45 pin (CPU) becomes low level. When the set runs out of recording paper, the shelter plate shuts the sensor
light, the phototransistor becomes OFF, and the input signal of IC401-45 pin becomes high level.
SHELTER PLATE
PS904
1
', r ...... :
?
* i
" i
t
' i
i
Sensor P.C.B.
CN904
-----o
o
o
o
o
1
2
3
4
5
+5V
CN414 Q420_
o
_= x_u4 152
T-'_ R_0 I 45
o c, T
Digital P.C.B.
CPU
IC401
P34
P74
Phototransistor Signal (IC401-45 pin)
Set Recording Paper ON Low level
No Recording Paper OFF High level
[Paper Out Sensor (JAM Sensor) (PS905)]
When the recording paper is jammed, the shelter plate shuts the sensor light, the phototransistor becomes OFF and the input
signal of IC401-406 (CPU) becomes high level. Usually, the shelter plate passes the sensor light, the phototransistor, be-
comes ON, and the input signal of IC401-46 pin becomes low level.
SHELTER PLATE
CN904
PS905. I_" ...... i 0 11
..... : ----o 4
I-
CN414
o
o
o--
o
o
o
+5V
Q42(]
+5V
R566
R612 46
_,|
C582 T
CPU
IC401
P34
P73
Phototransistor
NO JAM ON
JAM OFF
Signal (IC401-46 pin)
Low level
High level
-112-