Upgrading The Firmware; Adjustment-Free Variable Resistors (Vr) - Kyocera TASKalfa 420i Service Manual

1-6 Requirements on PWB Replacement
1-6-1

Upgrading the firmware

Follow the procedure below to upgrade the firmware of main PWB, engine PWB, scanner and panel.
Procedure
1. Perform maintenance item U000 (mainte-
nance report output) and check U019 ROM
version.
2. Press the power key on the operation panel
to off. Make sure that the main power indica-
tor and the memory indicator are off before
turning off the main power switch. And then
unplug the power cable from the wall outlet.
3. Insert USB memory in a notch hole of the
machine.
4. Insert the power plug and turn the main
power switch on. Upgrading firmware starts.
Caution:
Never turn the main power switch off during
upgrading.
5. [100% Completed] is displayed on the touch
panel when upgrading is complete.
6. Turn the main power switch off and unplug
the power cable from the wall outlet.
7. Remove USB memory from the machine.
8. Insert the power plug and turn the main
power switch on.
9. Perform maintenance item U000 (mainte-
nance report output) and check that U019
ROM version has been upgraded.
1-6-2

Adjustment-free variable resistors (VR)

The variable resistors listed below are set at the factory prior to shipping and cannot be adjusted in the field.
High voltage PWB: VR2, VR42, VR201, VR204
USB memory
Figure 1-6-1
2KR/2KS-1
D P
A 2
B 1
T 1
O P
1-6-1