HP 1055CMHP - Manual (Page 289)

Functional Overview
10-3 HP DesignJets 1050C and 1055CM Printers Service Manual
sensor.
n Service station: Contains the electronics needed to perform drop
detection, a DC motor/encoder for capping, wiping and spitting
and a stepper motor for priming.
n Front Panel: is the user interface. It consists of an LCD display, a
key panel and six LEDs.
Power Supply Unit (PSU)
The PSU is used to supply the power required by the product in any
condition.The PSU provides +5 V, +3.3 V, -15 V and +24 V to the
main board with the following maximum output currents:
The PSU is housed in the electronics enclosure and there are two
connections with the main board: voltage supply connection and
auxiliary output connection. The voltage supply connection is
implemented via a 15 pin connector with 14 wires, this connector
supply the +3.3V, +5 V and +24 V voltages and the ground lines to
the electronics. The auxiliary output connector provides the -15V
voltage, the PSU preset signal and the soft power off signal. PSU
preset signal is a logic signal generated by the PSU, when the PSU
is in on state this line is in open condition, when the unit is to switch
off the signal is grounded at least 3 ms before the +3.3V and +5V
outputs are out of regulation. The power off signal is a signal
generated by the main electronics and is used to turn off the power
supply. When the signal is not actuated the PSU is in on state, when
it is grounded by the main electronics then the PSU is switched off.
There is an input connector to the supply implemented with a hard
switch to provide the input voltage which is in the range 80-264 V.
Voltage Maximum Output
Current (A)
Systems
+3.3 12.0
Microprocessor, Memory and digital
Logic
+5.0 3.0 Digital and Analog Logic
+24.0 13.5
Analog power systems and Carriage
Voltage Supply
-15.0 0.1 Front Panel Auxiliary Voltage