Minolta Di620 Troubleshooting Manual page 86

1155SBT050302A
2) Black Copy
Section Step
1 Is the PC Drum properly grounded?
2 Is the developing bias contact normal?
Engine 3 Is the wiring between Image Transfer/Paper
Separator HV HV2 and the developing bias
normal?
4 Are the PJs and connectors plugged securely
into PWB-B and PWB-J?
1 Select "Tech. Rep. Mode," "Function," and
"Image Memory," in that order. Does "NG"
appear when "Input Image" is then run?
2 Select "Tech. Rep. Mode," "Function," and
Memory
"Image Memory," in that order. Does "NG"
appear when "I.R.
run?
1155SBT050303A
3) Low Image Density
Section Step
1 Is the PC Drum properly grounded?
2 Are the Comb Electrode and grid mesh nor-
mal?
3 Is the wiring between PC Drum Charge/
Developing Bias HV HV1 and PC Drum
Charge Corona normal?
4 Is the Image Transfer Corona dirty?
5 Is the copy paper damp?
Engine
6 Are the Ds Rolls in contact with the PC
Drum?
7 Is the developing bias contact normal?
8 Is the wiring between Image Transfer/Paper
Separator HV HV2 and the developing bias
normal?
9 Select "Tech. Rep. Mode," and "Level History"
and check to see if the value for "ATDC Set"
is correct?
Check Item Result
→ ← → ←
Mem. Prn" is then
Check Item Result
T-81
Action
NO Clean or change the PC
Drum ground plate.
NO Clean or change the devel-
oping bias contact.
NO Correct the wiring.
YES Change HV2 or PWB-J.
NO Plug them in securely.
YES Change PWB-B.
YES Change PWB-B.
Action
NO Clean or change the PC
Drum ground plate.
NO Check and change if nec-
essary.
NO Correct the wiring.
YES Clean or change the Image
Transfer Corona.
YES Change the copy paper.
NO Reinstall the Developing
Unit.
NO Clean or change the devel-
oping bias contact.
NO Correct the wiring.
NO Replenish the supply of
toner.