Ricoh D124-17 Service Manual page 810

2. Appendix 2: Service Program Mode
Head rank means the wave and voltage rank of the print head.
• Wave rank: Print eject wave <(A2000-002)> is a, b, c, d (4 types of wave data)
• Voltage rank: <Voltage compensation power (A2010-002) is A to H (8 types of
• If no head rank is set, the default values are "d" ("4" in NVRAM) for wave rank
Head rank settings
• Wave rank settings a to d correspond to SP settings 1 to4.
• Voltage rank settings A to H correspond to SP setting 0 to 7.
• Head ranks are stored in NVRAM.
These head rank settings are done to compensate for temperature of the print heads.
The thermistors are used to monitor the temperature of the print heads. This temperature
is used to assign the wave and voltage rank which is crucial to setting the force of
ejection for the piezo-electric element in the print head.
[0 to 7/4/1]
1 H1
2 H2
3 H3
4 H4
3132 ECB Correction Value
106
correction data)
and "E" ("4" in NVRAM) for voltage rank: dE