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Digital

Analog

RLY
+

+~ -~
CN4 RLY1 SA1 SA2 CN5 Line

+24V 2V LINE RX 12V IC3 5VD
+ -

-

MICP

T1

MICM LINEIN

PIA

LINEOUT SPKRP

SPKRM IC10
+ -

MICREF 24VA PC2 HOOK HOOK 5VD PAPER PAPER 5VD JAM JAM
+ -

MICP BELL MDM TX ENB 12V TONE1 ENB TEL RX ENB 5VD

EXT TEL

MICM LINEIN

SIA

LINEOUT SPKRP

24V

SPKRM

IC5 Ref H/S RX ENB 5VA 2.0V

RLY

VOLIN

Ref

ASIC IC1

VOLOUT

5VA

TONE1

TONE2 2V H/S TX MUTE IC2 2.0V 5VA

CN3 MICSP+ SPMIC+ H/S

5V

OP-PANEL

+

+

MIC H/S RX

-

+ -

Q1

24V Ref

24V

5VA SP MUTE 1 2 3
+ + -

IC12
CD V02 FC2 GND

5VA 8 7 4
FC1 VCC VIN V01

CN9 6 5
+ -

12V

SP

+

-

KX-FT902FX-B ANALOG BOARD: BLOCK DIAGRAM