Printhead Voltage Adjustment - Datamax I-Class Mark II Maintenance Manual

I-Class Mark II Maintenance Manual
2.2.4

Printhead Voltage Adjustment

Voltage measurement required; use extreme caution.
CAUTION
The printhead voltage adjustment is required (1) when replacing the power supply or (2) if the factory voltage
setting of the power supply has been changed. No voltage adjustment is required during a routine printhead
replacement. Adjust the Printhead Voltage as follows:
1. Turn OFF and unplug the printer and remove the cover; see Section 4.1.
2. Using a multi-meter set to measure DC voltage, connect the positive lead to Power Supply Connector J2 -
pin 1 and the negative lead to J2 - pin 6.
3. Raise the Printhead Assembly. Locate and
note the Printhead Resistance.
4. After ensuring that media is loaded, latch the
Printhead Assembly in the down position. Plug
in and turn ON the printer.
5. After READY is displayed, press the FEED
button (this will enable the printhead voltage
for approximately 30 seconds). Adjust the
voltage using RP1 on the Power Supply PCB
according to the printhead resistance listed in
the appropriate table below.
6. Turn OFF and unplug the printer. Remove the
multi-meter and replace the cover.
Adjustments and Maintenance
RP1
J2
Power Supply PCB
Printhead
Printhead Resistance
16