Ope-Pane Circuit - Citizen CLP-621 Technical Manual

2-2. Operation of Control Parts

(5-4) Ope-pane circuit

The ope-pane circuit consists of 4 LEDs and 4 switches.
Each LED is directly driven by the Custom IC (IC11) and each switch signal is input to the
Custom IC (IC11). (The following shows the simplified circuit diagram.)
To/From
IC 11 Custom IC
(5-5) USB I/F control circuit
The USB control circuit interfaces with the USB (Universal Serial Bus).
NAND gates (IC19) and transistor DTR5 consist of a USB connection detecting circuit.
When USB connector is connected, pin 1 of CN20 (USBVCC) is at "High" level. The
detection circuit detects this level and output a UBINTP pulse to the CPU.
IC1
CPU
155
P11
USBON
121
D23
UBINTP
161
UDM
UDM
160
UDP
CLP-621 & CLP-631
CN12
+3.3V
1
2
3
PRTLED
4
CNDLED
5
ERRLED
4
6
FEEDSW
PAUSESW
7
8
STOPSW
MODESW 9
10
11
12
[Main PCB]
USB connection detecting circuit
+3.3V
R147
P284
IC19C
9
P286
P287
8
10
UDP
D301
+3.3V
D302
D303
D304
SW301
SW302
SW303
SW304
[Ope-pane PCB]
+3.3V
DTR5
DTA143EUA
IC19B
4
P285
6
5
R148
1
P288
3
2
IC19A
P289
P290
2-34
+3.3V
POWER ON (Green)
PRINT (Green)
CONDITION (Orange)
ERROR (Red)
FEED
PAUSE
STOP
MODE/REPEAT
High when USB
connector is connected.
R149
L1
R152
C93
USBVCC
R150
R151
L2
USBLGND
SHIELD
[Main PCB]
CN20
1
2
DM
3
USB I/F
DP
4
5