Epson FX 1170 Service Manual - Page 62

II II II II, 2 Power Supply Operation

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2.2 Power Supply Operation REV.-A 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 I Input Voltage I Fuse F1 Rating I I I C076 PSB 103.5-132 VAC 2.5 AJ125 V I I I C076 PSE I 198-264 VAC I 7.25 lV250 V 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

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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