Toner Level Detection Control; Toner Bottle Detection Control - Konica Minolta 7020 Service Manual

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TONER SUPPLY UNIT
[3]

Toner Level Detection Control

3
24VDC
24VDC
PGND
PGND
SGND
5VDC
DCPS
Control of toner level detection is carried out by the TLD
(toner level detecter) and the PRDB (printer control board).
1. Operation
a. Toner level detection
The TLD uses a piezo element. When TLD detects
that toner in the cartridge has run low, it outputs a
toner supply signal to the PRDB, generating a
message on the LCD (display board).
b. Detection timing
Detection is carried out at the following times.
• During copying
c. Toner supply operation to toner supply unit
<Operation in the case of the 7020/25/30>
When TLD detects that toner is empty, SD6 (toner-
bottle SD) goes ON and engages the gear. When M4
(toner supply motor 1) goes ON, the bottle turns,
sending new toner to the toner supply unit.
<Operating in the case of the other than 7020/25/30>
3
When the TLD detects that the toner is empty up,
M10 (toner supply motor 2) goes ON and rotates the
toner bottle, causing new toner to be supplied to the
toner supply unit.
2. Signals
a. Input signal
(1) TLD (TLD −> PRDB)
Goes [L] when the quantity of toner in the toner
cartridge runs low. If [L] state continues for a
predetermined period, a corresponding message is
displayed in the LCD.
A
A
B
M4
B
24VDC
24VDC
A
A
B
M10
B
24VDC
24VDC
Other than 7020/25/30
5VDC
TLD TLD
SGND
PRDB
2-H-2
[4]

Toner Bottle Detection Control

24VDC
24VDC
PGND
PGND
SGND
5VDC
DCPS
PS5 (toner bottle PS) detects the presence or absence of
the toner bottle.
1. Operation
PS5 detects mounting of the toner bottle, and the
machine enters copy standby.
2. Signal
a. Input signal
(1) PS5 SIG (PS5 −> PRDB)
Toner bottle detect signal.
[H]: Toner bottle not present.
[L]: Toner bottle is present.
SGND
PS5 SIG PS5
5VDC
PRDB