Power Supply - Printronix P9012 Maintenance Manual

Power Supply

(Figure 2–21)
The power supply PCBA is a switching power supply. Its regulated outputs
are –12 and +36 VDC. These voltages are supplied to the hammer driver and
mechanism driver PCBAs.
The printer contains three identical power supply PCBAs. Loading of the
PCBAs is such that some operation of the printer may be possible with an
inoperable power supply.
The required AC input line voltage for operation of the power supply is as
follows:
90 to 128 VAC, 49–51 and 59–61 Hz
190 to 256 VAC, 49–51 Hz
If the AC input voltage is removed from the power supply, during either
normal operation or an overload condition, the power supply will recover so
that power may be reapplied in less than 2.5 seconds. If an overload occurs,
the power supply will return to the normal operation less than 8 seconds after
the fault is cleared.
The performance characteristics of the power supply are as follows:
–12 VDC supply, –12.8 V output voltage, 10%
+36 VDC supply, +36 V output voltage, 10%
Note that the 12V load includes 60,000 mfd of filter capacitors and is
considered a part of the power supply output filter.
NOTE: As shown in Figure 2–21, the power supply contains a jumper that
2–30
must be configured for the type of P9012 printer in use. For printers
that contain an Autotap board, place the jumper in the "SHORT"
position. For printers that do not contain an Autotap board, place the
jumper in the "OPEN" position.
Principles of Operation