2 - J - 3
TONER SUPPLY UNIT
[4] Toner Level Detection Control
Toner level detection control is done by the TLD (toner level
detecting sensor) and the CB (control board).
1. Operation
a. Toner level detecting sensor
A piezoelectric device is used as the TLD.
When the level of toner in the toner box becomes low, the
“supply toner” signal is output to the CB. As a result, a
message is displayed on the LCD (VFD1, VRD2) con-
nected to OB2 (operation board 2).
b. Detection timing
The detection timing is as follows.
* When the machine is switched ON
* When the front door is opened and closed
* During a copy operation
2. Signals
a. Input signal
(1) TLD (TLD → CB)
When the level of toner in the toner box becomes low,
this signal becomes [L], and a message is displayed on
the LCD connected to OB2.
12VDC
TLD
SGND
OB CLOCK
OB DATA
OB LATCH
22-B3
22-B4
22-B5
3-B3
3-B4
3-B5
CB
TLD
OB1
212-4
212-5
212-6
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