Specifications

REV.-A
2.3.1 Reset Circuit
Figure 2-24 shows the reset circuit.
After being input to the E05AIOAA gate array (MMU
:8B), the reset signal resets the gate array, then is sent
out to the other devices. Reset operation (hardware reset) is performed when:
● The printer power is turned on or off.
● A identity/font module is installed or removed with the power on.
SLOTB
P
SLOTA
#
,.7QA.77 r“m=
RESET
CPU (46)
of E05A24GA
(116)
of
CN2
JUNMM
BOARD
)
EXTERNAL
h
IV THLD
Figure 2-24.
Reset Circuit
2.3.1.1 Vx (Drive System Pull-up) Voltage Supply Circuit
Figure 2-25 shows the Vx voltage supply circ:uit.
The Vx voltage is used to pull up the bus for the control signals transmitted to the power on reset circuit
and drive circuits.
+5
t
/+7
t
GP
Figure 2-25. Vx Voltage Supply Circuit
After the printer power is turned on, the -t35 V line reaches about 27.7 V, and then Q5 and Q48 are turned
on so that current iG flows from the +5 V line to the Vx line. Therefore, +5 V is applied to the Vx line.
If the +35 V line drops below 27.7 V, Q5 and
Q48 are turned off so that the Vx line drops to O V. The IC
is threfore reset and the printer stops printing.
2-29