Brother MFC-9420CN Service Manual page 249

[ 3 ]-2 THV Tune Up (Code 45-2)
Function
This function is used when it is required to adjust the transfer voltage because a transfer
failure problem or the like is occurred on the recording paper. The adjustment is
implemented by changing the transfer voltage depending on the recording paper, and it is
changeable by ±4 steps from the standard value "0".
Always implement the operation when replacing the engine control board.
Operating Procedure
(1) Select NVM Tune UP with using the 4 or 5 key in the initial stage of the factory mode.
After selecting, press the 6 key.
The "45 NVM TUNE UP / ▲ 2 3 4 5 6 7 8 9 A B C D E F G" appears on the LCD.
(2) Select "2" with using the 4 or 5 key and press the 6 key.
(3) Select SIMPLEX with using the 4 or 5 key and press the 6 key.
The "45 THV TUNE UP / ► PPC / OHP / ENV" appears on the LCD.
PPC: for setting the plain paper
OHP: for setting the transparencies
LENV: for setting the envelopes
MTS: for setting the labels and thick paper
TS1: for setting print speed 1 (1/3 speed) with the thick paper
TS2: for setting print speed 2 (1/4 speed) with the thick paper
(4) Select the recording paper to be adjusted with using the 4 or 5 key and press the 6 key.
(5) Select the optional number with using the 4 or 5 key and press the 6 key.
The adjusted value is written into the NVRAM.
The value can be adjusted by ±4 steps.
(6) Press the 3 key so that the display is returned to the message described in Step (3).
When adjusting other recording paper, repeat Step (3) to (56).
(7) Press the 3 key again, and the machine returns to the initial stage of the factory mode.
8 -4 2 Confidential