Dc Line Voltage Monitoring Circuit - Epson LQ-1050 Technical Manual

Table 2-15 shows the relationship between head temperature at limit values and voltages at ANO of
the CPU.
Upper Limit
Lower Limit
2.3.5.3 +35V DC Line Voltage Monitoring Circuit
As shown
in Figure 2-44, this circuit detects voltage fluctuation in the +35V DC power supply line.
Detected voltage is divided by R82 and R83, and the voltage at point @ is input to
In Figure 2-45 and Table 2-16, if the +35V DC line drops to +3 1.7V or less during high-duty cycle
printing, the printer is protected as follows:
1. Printing is performed at normal speed.
2. If the +35V DC line voltage drops to 31.7V or less, the printing is stopped (no-load state).
3. The voltage is checked IOms after printing is suspended. If the voltage is higher than 31.7V, the
remainder of the printing line is printed at half-speed.
NOTE: If the voltage is not to higher than 3 1.7V again, printer changes to OFF-LINE status.
[v]
35
I .7
>
0
Fig. 2-45. +35V DC Line Voltage Compensation Sequence
Table 2-15. Relationship Limit Value and Voltage
Temperature ["C]
100
9 0
G?
Fig. 244. +35V DC Line Voltage Monitoring Circuit
- . - - - - - — - - - - - - - - -
.
I 2
One Line Printing
Voltage at ANO [V]
/
AV
CC
—
D52
AN I
AV
SS
Return
3
2-43
0.82
1.01
AN 1 of the CPU.
C P U
(7B )
L i m i t Volue
Process