Hs Cont (05P0781) - Furuno FM-8800D Service Manual

5.4.7 HS CONT (05P0781)

CPU on HS CONT board responds to the polling from the Transceiver unit and sends
out the information. For example, handset is OFF HOOK etc.
CPU on the Transceiver unit responds to it and carries out appropriate actions and sends
a command to the Remote Handset CPU at the time of responding. Remote Handset
CPU will carry out a command from the Transceiver unit and displays it.
U14 (EEROM) on HS CONT board stores ID number, dimmer, and contrast of a
Remote Handset.
EEROM
U14
(CAT25C16S)
LCD
Module
DIM Cont. 3bits
MFM07Q10
Reset
SW PCB
Scan out 3bits
(05P0715)
Scan in 8bits
Reset
Y1
18.432MHz
Hook senser
U12
(DN6848S)
PTT SW
S1
Reset
RS-485
Driver/Receiver
TXD
RXD
SN75LBC1790R
Mulutiplexer
A/B
C
CPU
Xcom
Ycom
Zcom
U2
(HD64F3067RF)
U13
(TC4053)
Flash ROM:128k
RAM:4k
UART:3ch
ICU:6ch
PIO:79
Vol. CONT.
Key click tone
Vol. Cont. 32step
+5V
U8
TA7805F
+5V1
+9V
U9
AN77L09M
U11 U10
M51953
TA7805F
Fig 5.4.22 HS CONT Block Diagram
5-27
U3
DTMF
R34
X1
Y1
X0
U5
U1
Y0
LINE
Z0
Z1
R45
R35
U4
U5
IN1
IN2
OUT1
CLK
U7
DATA OUT2
U6(M62429)
HS CONT
05P0781
5.4 Block Description
DATA A/B
J2-#1,2
CONT
J2-#3
Line in
J2-#7,8
Handset MIC
Earspeaker
(Handset)
Q5, 6
Mute
2bits
Line out
J2-#5,6
Loudspeaker
(Handfree)
Distress switch
J2-#4
+15V
J2-#9