NEC Super Script 4400, Maintenance Manual

Page: 264 / 317

Factory Service Mode Test Procedures 255
TROUBLESHOO
TING
2. THV Tune Up
This mode is used when transfer voltage needs to be adjusted due to the errors caused such as transfer failure
on the media. The adjustment is to change the transfer voltage, subject to the media to be used, against the
reference value 0 (zero) in the range between the step -4 and +4.
a.
Press Select key after selecting NVM TUNE UP.
b. After selecting THV TUNE UP Code 2, press Select key.
c.
After selecting the media to be tuned up, press Select key. (i.e. PPC)
d. Tune Up value can be adjusted within 8 steps between the step -4 and +4.
e.
After selecting a given number, press Select key.
f. Press the Clear key to wrap up the tune-up work for PPC.
g. Repeat the step 3 through 5 for other media such as OHP or Label.
h. Press the Clear key to wrap up the tune-up work.
3. DBV Tune Up
This mode is used when image optical density needs to be adjusted. Adjustment is to adjust the developer
bias voltage against the reference value 0 (zero) in the range between the step -4 and +4.
a.
Press Select key after selecting NVM TUNE UP.
b. After selecting DBV TUNE UP Code 3, press Select key.
c.
After selecting the color to be tuned up, press Select key. (i.e. Magenta)
d. Tune Up value can be adjusted within 8 steps between the step -4 and +4.
e.
After selecting a given number, press Select key.
f. Press the Clear key to wrap up the tune-up work for Magenta.
g. Repeat the steps c through e for each color.
h. Press the Clear key to wrap up the DBV tune-up work.
4. CBV Tune Up
This mode is used when the image defects attributing to transfer drum need to be improved. Adjustment is to
adjust the drum cleaner bias voltage against the reference value 0 (zero) in the range between the step -4 and
+4.
a.
Press Select key after selecting NVM TUNE UP.
b. After selecting CBV TUNE UP Code 5, press Select key.
c.
Tune Up value can be adjusted within 8 steps between the step -4 and +4.
d. After selecting a given number, press Select key.
e.
Press the Clear key to wrap up the tune-up work for CBV.
5. FBV Tune Up
This mode is used when the image defects attributing to transfer drum need to be improved. Adjustment is to
adjust the drum cleaner bias voltage against the reference value 0 (zero) in the range between the step -4 and
+4.
a.
Press Select key after selecting NVM TUNE UP.
a. After selecting FBV TUNE UP Code 6, press Select key.
a. Tune Up value can be adjusted within 8 steps between the step -4 and +4.
a. After selecting a given number, press Select key.
a. Press the Clear key to wrap up the tune-up work for FBV.
46 NVRAM Initial
This mode can initialize (data clear) all the data of NVRAM on MCTL PWB.
1. Select YES if NVRAM should be executed. If not, select NO.
2. Press Select key so that RAM INITIAL will be executed. (All the data will be cleared.)
3. Following modes shall be executed to set the RAM data.