7-42 170 Series Monitor Revision C
2000947-004
Serviceable Assemblies: Servicing the Recorder
Adjusting the Printhead Current
Equipment Required
Phillips screwdriver
Digital voltmeter
30 Ω, 20 W, 5% resistor
Procedure
CAUTION
RECORDER STATUS—Ensure the recorder remains off during
this procedure.
1. Remove the AC line cord from the monitor to completely remove power.
2. Follow the instructions for “Removing the Monitor Top Cover” on page 7-19,
including disconnection of the display board cable and the membrane switch
panel cable from the main board.
3. Disconnect the printhead cable from J1 on the main board.
4. Locate resistor R562 and potentiometer R507 on the main board.
5. Attach the leads of the digital voltmeter across R562.
6. Re-connect the AC adapter cord to the monitor and turn on the monitor.
7. Measure the voltage across R562 and record the value.
8. Turn off the monitor.
9. Attach a 30 Ω (20 W, 5%) resistor across R562.
10. Turn on the monitor.
11. Adjust potentiometer R507 until the voltage across R562 is 0.5 V less than the
voltage recorded in step 5.
12. Turn off the monitor and remove the voltmeter leads and the 30 Ω resistor.
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