Epson 890N - FX B/W Dot-matrix Printer Service Manual page 51

EPSON FX-890/2190
Table 2-4. Input Specifications
Power Supply Unit C524 PSB
Name (100-120V Spec)
Special output holding
time
(Input: 85 V, 60 Hz)
(The period from the
time when output 1 has
dropped below 26 V to
(Output: At output 1 of no-load and output 2 of rated load)
the time when output 2
drops below the output
voltage lower limit)
Note "*1": Each value indicated here is only the average of measured values of samples
(sample size n = 3), that is, it is not a typical value or guaranteed value.
"*2" : Each value does not include the current flowing in the capacitor of the EMI filter
circuit.
OUTPUT SPECIFICATIONS
Table 2-5. Output Specifications
Item
Rated output voltage
Output voltage fluctuation *1
Rated output current
Output current at startup *2
Output current range
Ripple voltage *3
*3
Spike voltage
Note "*1": Neither Output 1 nor Output 2 includes the spike voltage component.
"*2" : The output current during power supply startup must be not greater than the value
specified above.
"*3" : The values for ripple and spike voltage indicated above, which are the values with a
rated resistance load, are only for reference. (Ambient temperature: 25
For measurement, connect a KMF50V470
capacitor to the output 1 terminal, and a KME16V47
µ
0.1 F film capacitor to the output 2 terminal.
Operating Principles
C524 PSE C524 PSH
(220-240V Spec) (100-240V Spec)
120 ms or more
(Input: 187 V, 50 Hz) (Input: 85 V, 60 Hz)
Output 1 Output 2
+42 V +5 V
40.0 ~ 44.0 V 4.75 ~ 5.25 V
0.8 A 0.7 A
0 A 0.7 A
0~2.8 A 0~0.7 A
----- 100 mVpp Typ.
1500 mVpp Typ. 300 mVpp Typ.
°
C)
µ
F electrolytic capacitor and 0.1
µ
F electrolytic capacitor and
PROTECTIVE FUNCTIONS
Item
Overcurrent protection (OCP)
OCP reset method
Load short-circuit current
Overvoltage protection (OVP)
OVP preset voltage
µ
F film
Overview
Table 2-6. Protective Functions
Output 1
Dropping + cutoff
Turning power off
once and on again
0 A
Cutoff type
45 ~ 58 V
Revision B
Output 2
Cutoff
Turning power off
once and on again
0 A
Cutoff type
6 ~ 9 V
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