Service manual

EPSON FX-890/2190 Revision B
Operating Principles Overview 51
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
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
°C)
For measurement, connect a KMF50V470µF electrolytic capacitor and 0.1 µF film
capacitor to the output 1 terminal, and a KME16V47
µF electrolytic capacitor and
0.1
µF film capacitor to the output 2 terminal.
PROTECTIVE FUNCTIONS
Special output holding
time
(The period from the
time when output 1 has
dropped below 26 V to
the time when output 2
drops below the output
voltage lower limit)
120 ms or more
(Input: 85 V, 60 Hz) (Input: 187 V, 50 Hz) (Input: 85 V, 60 Hz)
(Output: At output 1 of no-load and output 2 of rated load)
Table 2-5. Output Specifications
Item Output 1 Output 2
Rated output voltage +42 V +5 V
Output voltage fluctuation
*1
40.0 ~ 44.0 V 4.75 ~ 5.25 V
Rated output current 0.8 A 0.7 A
Output current at startup
*2
0 A 0.7 A
Output current range 0~2.8 A 0~0.7 A
Ripple voltage
*3
----- 100 mVpp Typ.
Spike voltage
*3
1500 mVpp Typ. 300 mVpp Typ.
Table 2-4. Input Specifications
Power Supply Unit
Name
C524 PSB
(100-120V Spec)
C524 PSE
(220-240V Spec)
C524 PSH
(100-240V Spec)
Table 2-6. Protective Functions
Item Output 1 Output 2
Overcurrent protection (OCP) Dropping + cutoff Cutoff
OCP reset method
Turning power off
once and on again
Turning power off
once and on again
Load short-circuit current 0 A 0 A
Overvoltage protection (OVP) Cutoff type Cutoff type
OVP preset voltage 45 ~ 58 V 6 ~ 9 V