Temperature Monitoring - Ricoh D124 Detailed Descriptions Manual

6.6 TEMPERATURE MONITORING

Print Head Thermistors
There are two thermistors [A]. One thermistor
thermistor is for color ink (C, YM). These thermistors measure the temperature
around the print head units inside the carriage. The machine uses this information to
adjust the flow of ink from the print heads. Monitoring the temperature near the print
heads is critical because the temperature can affect the viscosity of the ink at the ink
nozzles.
 At low temperatures, the viscosity of the ink becomes high and can slow ink flow.
 At high temperatures, the viscosity of the ink becomes low and can cause ink to
spill and run.
 The adjustment is done by changing the duty (strength of electrical charge) used
to activate the piezoelectric elements that project ink through the ink nozzles of
the print heads. (The amount of ink ejected will vary directly with the amount of
charge applied to the piezoelectric element.)
D124
is for black ink (K1, K2) and one
116 Detailed Descriptions