Sharp FACSIMILE FO-4500 Service Manual page 111

(Example: Fax signal send)
E
T1
CURRENT
L1
SENSOR
DUMMY
L2
L&C
S
T2
T1
T2
SPEAKER
Matrix table of control signals
Stand-by
FAX signal sending
FAX signal receiving
Before and after dialing
Off-hook dial DP dialing
DTMF dialing
Before and after dialing
On-hook dial DP dialing
DTMF dialing
Before and after dialing
300bps check
Auto dial
DP dialing
DTMF dialing
Ringer ringing
Stand by/buzzer
Key buzzer OFF HOOK
ON HOOK
ON HOOK
Holding
OFF HOOK
Sound volume control signal of hand-set receiver
VRSEL1/VRSEL2/VRSEL3 Matrix
Sound volume High
VRSEL 1 L
VRSEL 2 H
VRSEL 3 H
H
L
L
~ –
TAX
H
H PULSE
FILTER
~ +
L
SHUNT
CIRCUIT
H
CI DETECTOR
L
SPARK
QUENCH
H
L
CML
H: ON
L: OFF
L
H
H
H
L
H
H
L
H
H
H
L
H
L
L
H
H
H
H
Middle Low DTMF sending
H H
L H
H L
TEL/LIU PWB
HS CNLIU-18
CML CNLIU-22
E-RLY CNLIU-13
DP CNLIU-20
CNLIU-9
MPX A
N.C. CNLIU-7
N.C. CNLIU-8
N.C. CNLIU-10
H
SIGTX CNLIU-16
L
H
SIGRX CNLIU-17
L
ACTIVE
CHOKE
CNLIU-19
N.C.
CNLIU-23
N.C.
H CNLIU-24
N.C.
L
DPMUTE CNLIU-15
CI CNLIU-21
CNLIU-14
SPOUT
SPMUTE CNLIU-12
CNLIU-1
DG
CNLIU-3
DG
CNLIU-2
+5V
CNLIU-5
+12V
CNLIU-4
AG
CNLIU-6
AG
Fig. 9
MPXA MPXB
H: TX LINE H: Low gain
L: OFF L: High gain
L L
H H
L H
H H
L H
H H
L H
L L
H H
L H
L H
L H
H H
L L
L L
H H
H H
H H
H H
H
H
H
5 – 21
CONTROL PWB
CML
TELMUTE
VOLCNT
MPX A
MPX B
VRSEL1
VRSEL2
SPMUTE
TXOUT
RXIN
RHS
DP
SDT
HS1
DT
DT3
CI
VOLA
VOLB
BZOUT
H
X0
SPOUT
X1
X2
L
DG
+5V
+12V
AG
MIC MUTE RCV MUTE
H: ON H: ON
L: OFF L: OFF
H H
H H
H H
L L
H L
H L
L H
H H
H H
H H
H H
H H
H H
H H
H H
L L
H H
H H
H H
FO-4500H
CPU
MODEM
GATE
ARRYA
SP MUTE
H: ON
L: OFF
H
H
H
H
H
H
L
L
L
H
H
H
H
L
L
L
L
L
H