5.3 Block Description
5-12
2. PWR (08P3226)
The PWR board is a power supply board for the printer integrated in the Display unit
of the printer-incorporating type NX-700A. It outputs +5.2 VDC from the power
supply input of +12 VDC to +24 VDC.
Main specifications are as shown in the table below.
Table 5.3.4 Specifications of PWR board
Item Specifications Remarks
Input power supply
voltage range
+10.8 VDC to +31.2 VDC
Switching frequency 135 kHz + 1 kHz Adjusted at R20
Conversion efficiency 65 % or more (at max load)
+5.2 VDC output
+5.2 VDC +
0.2 V, 50 mA to 1.5 A,
Peak current 3 A
Not adjusted
Output protection Over-current protection: 3.6 A to 6 A Detected at R30
Input reverse connection
protection circuit
Provided, Protected by fuse
(F401: 2 A at CR401 of the
Receiver unit.)
Input low-voltage
protection
Not provided (Stopped by input low-voltage
protection of the Display unit)
Input over-voltage
protection
Not provided (Stopped by input over-voltage
protection of the Display unit)
Fig. 5.3.6 Block Diagram of PWR board
Line FIL
SW
Q1
L1, C1-3
DC INPUT
T1
TP2
CR4
CR5
C16
C11
L2
+5.2V
10V
AVR
R20
R30
U1/2, Q2/3
Vcc
U4
MB3759PF
PWM
Driver
CR3, Q4
C10
CT
DTC
RT
E1,2
DET
U7/8
U5, 3
IN1IN2
Vcc
Soft
Start
Vcc
TP1
DC+
DC-
+12V
+12V
DC-
R23
R24
DET
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