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e-STUDIO281c/351c/451c ADJUSTMENT June 2005 © TOSHIBA TEC
3 - 48
3.8 High-Voltage Transformer Setting
3.8.1 General description
The high-voltage transformers (PS-HVT-350) supply high-voltage to the parts related to charging,
development, transfer and drum cleaning.
The high-voltage transformer has the following high-voltage outputs.
CH1: Main charger wire
CH2: Main charger grid bias
CH3: Color developer bias
CH4: Black developer bias
CH5: 1st transfer roller bias
CH6: 2nd transfer roller bias
CH7: Cleaning blade bias
Note: Note:
Make sure not to lose the data sheets which are attached to the high-voltage transformers. Use
these sheets for the following setting.
Never move the fixed volumes of resistors since output adjustment is performed when the
devices are shipped.
3.8.2 Setting at the replacement of high-voltage transformer
After replacing a high-voltage transformer, be sure to enter the data shown on the data sheets (main
charger grid bias, color/black developer bias and 1st/2nd transfer roller bias) noted above according to
the following procedure.
(1) While pressing [0] and [5] simultaneously, turn the power ON.
(2) Key in the adjusting codes in the table below and press the [START] button.
(3) Key in the adjusting value corresponding to each code on the attached sheets, and then press
[ENTER] or [INTERRUPT].
<Adjustment Mode (05)>
(4) Key in all the codes in the above table by repeating (2) and (3).
(5) Turn the power OFF.
Adjusting code Item to be adjusted Adjusting value
334 Main charger grid bias lower limit value Refer to the data sheets
335 Main charger grid bias upper limit value
338 Color developer bias lower limit value
339 Color developer bias upper limit value
372 Black developer bias lower limit value
373 Black developer bias upper limit value
250 1st transfer roller bias lower limit value
251 1st transfer roller bias upper limit value
252 2nd transfer roller bias lower limit value (+)
253 2nd transfer roller bias upper limit value (+)