Oki C7200 Service Manual page 232

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A value in the shaded section is initial. The set values are applicable only to this test mode (No writing into EEPROM is performed.)
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When the (3) key is pressed, with "PRINT EXECUTE" on the lower display after step 2, the test printing is executed using the values designated in steps
2 and 3. Pressing the (7) key suspends the test printing.
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The following messages are showing at warm-up and during printing.
P: Number of Sheets Printed for Test (in prints)
U: Upper-Heater Temperature Measurement [Set Value] (in units of °C)
L: Lower-Heater Temperature Measurement [Set Value] (in units of °C)
T: Environmental Temperature Measurement (in units of °C)
H: Environmental Humidity Measurement (in units of %)
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The display is changed at the press of the 3 33 33 key.
YTR, MTR, CTR and KTR mean the transfer voltage settings for colors (in KV).
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The display is changed at the press of the 3 33 33 key.
YR, MR, CR and KR are the transfer voltage measurements for transfer roller colors (in KV).
4. While "PRINT EXECUTE" is indicated in the lower display after the Item 2 procedure, press Key (3) to start test printing with the values set in Item 2 and 3
procedures.