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Purpose
To investigate the actual number of printed papers with the drum units
(Investigating how the returned sets' drum units were used)
Method
Whether the drum unit is new or old should be judged by detecting the turn delay of Mixing Paddle (Toner detection sensor).

• When shipping the drum unit, the mixing paddle gear is set to the position that has the space of more than one turn (max. 600×).
• After the main motor starts, when the toner detection signal is not varied within the fixed time (max. 4.5 sec), the drum unit

is found new.

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The unit consists of a LCD (Liquid crystal display), KEYs and LEDs (light-emitting diodes). They are controlled by the Gate Array
(IC1) on Operation board and IC300 on Main board. 
The key matrix table is shown below.

1. Key Matrix 

a. Hard Scan

*LED7 should be set to KSL4. "8 x 5" key matrix is executed by hardware scanning. 

2. LED

• AUTO ANSWER LED ON/OFF port---LED2
• FAX MODE LED ON/OFF port---LED1
• COPY MODE LED ON/OFF port---XLED15
• SCAN MODE LED ON/OFF port---XLED14

KIN0

KIN1

KIN2

KIN3

KIN4

KIN5

KIN6

KIN7

KSL0 AUTO ANSWER CALLER ID

NEXT

SET

MENU

FLASH

H/S MUTE

REDIAL/
PAUSE

KSL1 SCAN

S6

VOL-

ENHANCED
COPY

RESOLUTION #

0

*

KSL2 STOP

PREV

CONTRAST

9

8

7

KSL3 COPY

FAX

S12

MONITOR

3

2

1

KSL4
(LED7)

START

VOL+

S11

QUICK SCAN

6

5

4

CN102

CN511

IC300

SOC

LCD MODULE

CN101

8x5
KEYS
MATRIX
(Hard)

LED

MAIN BOARD

OPERATION BOARD

GATE ARRAY IC

IC101

3x3
KEYS
MATRIX
(Soft)

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The Gate Array (IC101) works only for writing the ASCII code from the data bus (D4~D7). V0 is supplied for the LCD drive. 
R127 and R128 are density control resistors. 
Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC101).