Panasonic KX-FL423RU Service Manual ▷ View online
49
KX-FL423RU-B / KX-FL423RU-W
6.13. Operation Board Section
The unit consists of a LCD (Liquid crystal display), KEYs and LEDs (light-emitting diodes). They are controlled by the Gate Array
(IC601) and SOC (IC101: on the DIGITAL BOARD).
The key matrix table is shown below.
(IC601) and SOC (IC101: on the DIGITAL 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---LED6
KIN0
KIN1
KIN2
KIN3
KIN4
KIN5
KIN6
KIN7
KSL0
SKEY1
4
NEXT
VOL-
MONITOR
#
0
KSL1
SKEY2
COPY
HELP
VOL+
FLASH
6
8
LOWER
KSL2
SKEY3
STOP
QUICK SCAN PREV
REDIAL/
PAUSE
PAUSE
3
2
7
KSL3
1
----------
CALLER ID
SEARCH
SEARCH
AOH
FAX AUTO
ANSWER
ANSWER
GREETING
ERASE
PLAY BACK
KSL4
SKEY4
START
MENU
SET
MUTE
9
5
SKEY5
CN601
CN110
IC101
SOC
LCD MODULE
CN651
8x5
KEYS
MATRIX
(Hard)
KEYS
MATRIX
(Hard)
LED
DIGITAL BOARD
OPERATION BOARD
GATE ARRAY IC
IC601
50
KX-FL423RU-B / KX-FL423RU-W
6.14. LCD Section
The Gate Array (IC601) works only for writing the ASCII code from the data bus (D4~D7). V0 is supplied for the crystal drive.
R123 and R124 are density control resistors.
Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC101).
R123 and R124 are density control resistors.
Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC101).
51
KX-FL423RU-B / KX-FL423RU-W
6.15. HVPS (High Voltage Power Supply) Section
6.15.1. HVPS Specification
There is one terminal for transcription output and + and - are switched to be output.
6.15.2. CHG-BIAS (Charge BIAS)/GRID/Unit
When IC101 turns on the transistor Q210. CHG REM becomes “L”, and Charge BIAS(180
µA) is output from CHG OUTPUT.
GRID BIAS is generated by the current flowing in the GRID circuit via charge wire and GRID.
6.15.3. DEV DC BIAS UNIT
If CHG REM is “L”, transistor Q209 turns on from the IC101 and the DEV DEM becomes “L”, the developing voltage(+220V) is
out put from DEV terminal.
out put from DEV terminal.
Charge (CHG)
Grid
Developing DC
Transfer (TRA-)
Transfer (TRA+)
Output Characteristics Constant current
Constant voltage
Constant voltage
Constant current
(Variable)
(Variable)
Constant voltage
Nominal Output Voltage 4.25kV
475±18V
220V±15V
100M
Ω (-800V)
800V±100V
Nominal Output Current 180±15
µA
(180
µA)
---------
-10.4
µA±1µA
PWM 50%
(at 100M
(at 100M
Ω)
1000M
Ω
(0.8
µA)
Load Range
21.0M
Ω
100M
Ω~2000MΩ
62.5~312M
Ω
10M
Ω~1000MΩ
Constant Current
Range
Range
-2500V~-500V
52
KX-FL423RU-B / KX-FL423RU-W
6.15.4. TRA(+) BIAS (Transfer(+) BIAS)/TRA(-) BIAS (Transfer(-) BIAS) Unit
When CHG REM is “L” and TRA CLK is “open”, Charge BIAS(180
µA) is output from CHG OUTPUT, and at the same time Trans-
fer(+)BIAS(800V) is output from TRA OUTPUT. When 5.425kHz PWM(Plus Width Modulation) signal is input to TRA CLK through
transistor Q208, Transfer(-) CURRENT BIAS corresponding to PWM signal is output from TRA OUTPUT.
transistor Q208, Transfer(-) CURRENT BIAS corresponding to PWM signal is output from TRA OUTPUT.
Click on the first or last page to see other KX-FL423RU service manuals if exist.