Service manual

REV.-A
2.2 Power Supply Operation
The FX-870/l 170 printer is powered by either of the two power supply boards: 120 VAC power supply board
(BOARD ASSEMBLY, C076 PSB) or 220/240 VAC power SUPPIY board (BOARD ASSEMBLY, C076 pSE). These
boards output the DC current necessary to drive the printer control circuits and the printer drive mechanism.
Fuse F1 (2.5A/125 V for C076 PSB or 1.25 lV250 V for C076 pSE) is used to Protect the Power suPPIY circuit
of each board in case of a short circuit.
Table 2-3. Power Supply Input Voltages and Fuse Ratings
1
Board
Input Voltage
Fuse
F1 Rating
I I
I
C076 PSB
I
103.5-132 VAC
I
2.5 AJ125 V
I
I
C076 PSE
I
198-264 VAC
I
7.25 lV250 V
I
2.2.1 Power Supply Overview
The power supply board has two power output lines that supply power to the control circuits and the drive
mechanisms. Table 2-3 lists the components
(pans or assemblies) of the printer that are powered by these
two DC voltages.
Table 2-4. Power Supply Output Voltages and Applications
Output voltage (DC)
Applications
+35
v CR (carriage) motor drive
PF (paper feed) motor drive
Printhead drive
+5 v Main control board logic circuitry
Sensors
Control panel LEDs
PF (paper feed) motor hold
2-19