Epson LQ-2550 Technical Manual page 110

REV.-A
2.3.4.2 35 V Line Voltage Detection Circuit
As shown in Figure 2-58, this circuit detects
by R79 and R80, and the voltage at point @ is input to
As shown in Figure 2-59, if the detected voltage drops to 30.53 V or less due to a circuit problem or
high duty cycle printing, the printer stops printing. and the message "ERROR 2" is displayed on the
control panel on the LCD. The printer cannot be recovered from this state. The power must be turned
off and then on again.
NOTE: If "ERROR 2" is displayed again after the printer power is turned off and on, refer to Chapter
5 (Troubleshooting).
35
c .-
>
3 0 . 5 3
0
Table 2-39 shows the relationship between the 35 V line voltage and the input voltage at ANO.
the voltage on the
\
CPU
SUB
(7 B)
AV
SS
Figure 2-58. 35 V Line Voltage Detection Circuit
— — — - — — — — - — — — — — — - — — .
Normal Operation
Figure 2-59. 35 V Line Protection
35 V
the
+35
1 0
'
"ERROR2"
2-64
detected voltage is divided "
Limit
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