Brother International HL-3400CN Service Manual - Page 158

CHAPTER 5 CONTROL PANEL OPERATION PR2001003 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 45-1 LP TUNE UP +4 45-2 THV TUNE UP PPC/0HP: 0, LABEL: - 2 45-3 *3 45-4 DBV TUNE UP DVM TUNE UP CBV TUNE UP 0 +1 0 *1 45-5 FBV TUNE UP + 1 *2 *3 REG TUNE UP 0 *3 VD0 TUNE UP 0 45-6 ADC TUNE UP 0 *3 AC1 TUNE UP 0 *3 LF2 TUNE UP 0 *3 AC2 TUNE UP AIBID: 0, C: + 1 *3 ADD TUNE UP -4 *3 TH1 TUNE UP 0 *3 PSI 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. CBVTUNE 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, 5-36