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1. Toner low can be judged by continuous 5-times TONER LOW signal at only printing.

(It is not executed at.)

2. Toner full can be judged by continuous 3-times TONER FULL signal at initialization.

(It is not executed at printing.)

3. In the ordinal operation, “CHECK DRUM” is displayed when TONER EMPTY sensor does not generate a signal for 3.3 sec-

onds.

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When the handset is raised, the switch is turned off, and the signal of IC300-U24pin becomes low level.
When the handset is settled, the switch is turned on, and the signal of IC300-U24pin becomes high level.

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. 

SW940

Signal (IC300-U24pin)

ON HOOK

OPEN

High level

OFF HOOK

CLOSE

Low level

KIN0

KIN1

KIN2

KIN3

KIN4

KIN5

KIN6

KIN7

KSL0

AUTO ANSWER S1

S3

MONITOR

↓

*

#

-

KSL1

FAX

S2

ZOOM

FLASH

←

7

0

START

KSL2

COPY

COLLATE

REDIAL

SET

4

9

6

KSL3

CONTRAST

N in 1

MENU

↑

2

5

STOP

KSL4
(LED7)

SCAN

RESOLUTION LOWER

CALLER ID

→

1

8

3

CN2

CN511

IC300

ASIC

LCD MODULE

CN1

8x5
KEYS
MATRIX
(Hard)

LED

MAIN BOARD

OPERATION BOARD

GATE ARRAY IC

IC1

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2. LED

• AUTO ANSWER LED ON/OFF port---LED6 (IC1-2pin)
• FAX MODE LED ON/OFF port---XLED8 (IC1-5pin)
• COPY MODE LED ON/OFF port---LED5 (IC1-41pin)
• SCAN MODE LED ON/OFF port---LED2 (IC1-36pin)