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FC-22 ADJUSTMENT 1 - 74 January 2000 © TOSHIBA TEC
1.14 High-Voltage Transformer Settings
1.14.1 Overview
This machine uses four main high-voltage transformers for charging/development/discharging and one
transfer transformer for transfer/suction.
The main high-voltage transformers (PS-HVT-M-310) are used each for one of the colors Y, M, C and K,
giving a total of four units.
The transfer transformer (PS-HVT-TB-310) supplies high-voltage for the transfer rollers Y, M, C and K
and the suction charger to be used in black mode.
The main high-voltage transformers have the following high-voltage outputs.
CH1: main charger wire
CH2: main charger grid bias
CH3: developer bias
CH4: cleaning blade bias
The transfer transformer has the following high-voltage outputs.
CH1: transfer roller bias (Y)
CH2: transfer roller bias (M)
CH3: transfer roller bias (C)
CH4: transfer roller bias (K)
CH5: suction charger
* CH5 is used in black mode only.
The main high-voltage transformer and transfer transformer for service parts are supplied with the data
sheets to be used for the following setup. Be careful not to lose them.
Output adjustment is performed when the devices are shipped, so under any circumstances, do not
move the resistors fixed to the board.
1.14.2 Settings after replacing main high-voltage transformers
After replacing a main high-voltage transformer, input the data stated on the supplementary data sheet
(main charger grid bias, developer bias) according to the procedure below without fail.
<Settings for main charger grid bias>
(1) Turn the power ON while pressing [0] and [5] simultaneously.
(2) Input code 252 and press [START] key.
ৎ The lower limit value for main charger grid bias is displayed for each Y, M, C and K.
(3) Input the sub-code (0: Y, 1: M, 2: C, 3: K) and press [START] key.
(4) Input a value according to the supplementary data sheet and press either [SET] or [INTERRUPT] key.
(5) Input code [253] and press [START] key.
ৎ The upper limit value for main charger grid bias is displayed for each Y, M, C and K.
(6) Input the sub-code (0: Y, 1: M, 2: C, 3: K) and press [START] key.