Brother HL-3450CN Service Manual page 158

45 NVRAM TUNE UP
This mode is not used in normal operations, but is used when fine adjustment of the HVPSU
voltage values is required. Do not use this mode unless you are sure that you understand
the effects of making adjustments to the various charge voltages in the HVPSU.
This mode consists of the following 6 (six) subordinate modes from 45-1 to 45-6:
Configuration of NVRAM TUNE UP
45 NVRAM TUNE UP
*1 '0' is applied for machines produced after June 2000. You need to set the CBV TUNE
UP value to '0' for machines, which were produced before June 2000, to which '+1', has been
applied. For setting procedures, see 45-4. CBV TUNE UP in this section.
*2 '+1' is applied for machines produced after June 2000. You need to set the FBV TUNE
UP value to '+1' for machines which were produced before June, 2000, to which '0' has been
applied. For setting procedures, see 45-5. FBV TUNE UP in this section.
*3 Do not change settings of these modes.
NOTE:
After performing NVRAM INITIAL in the next section, be sure to set the LP TUNE UP value to
'+ 4'
45-1 LP TUNE UP
45-2 THV TUNE UP
45-3 DBV TUNE UP
*3 DVM TUNE UP
45-4 CBV TUNE UP
45-5 FBV TUNE UP
*3 REG TUNE UP
*3 VDO TUNE UP
45-6 ADC TUNE UP
*3 AC1 TUNE UP
*3 LF2 TUNE UP
*3 AC2 TUNE UP
*3 ADD TUNE UP
*3 TH1 TUNE UP
*3 PS1 TUNE UP
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HL-3450CN SERVICE MANUAL
<Factory Setting>
+ 4
PPC/OHP: 0, LABEL: - 2
0
+ 1
*1
0
*2
+ 1
0
0
0
0
0
A/B/D: 0, C: + 1
- 4
0