Making A Telephone Call - Ricoh FAX220 Service Manual

2. Making a Telephone Call

2-1. Manual Dialing from the External Telephone
In standby mode, the line is connected to the external telephone. Then the user can dial from the external handset.
If the user presses Start to send or receive a fax message, the RY1 relay switches up to connect the line to the mo-
dem.
2-2. Manual Dialing from the Built-in Telephone
There are two ways to dial manually from the built-in telephone: handset mode and on-hook mode.
Handset mode: When the user
picks up the handset, the Hook
Switch goes up to connect the line
to the dialer and speech circuit.
The digits dialed at the dialpad are
directly informed to the dialer, and
the dialer dials the number and
passes them to the FCE to indicate
the dialed number on the LCD. If the
user presses Start to send or re-
ceive a fax message, the RY1 relay
switches up to connect the line to
the modem on the FCE.
On-hook mode: When the user
presses the On Hook Dial key, the
RY2 relay switches up to connect
the dialer to the line. Then the dialer
acts in the same way as explained
for handset mode.
LIU
Speech
Circuit
To/From
the Line
RY1/RY2
Relays
LIU/OPU Block Diagram
A-2
Handset
Dialer
Pulse/Tone
GS/Flash
(Not used)
Photocouplers
FDU/FCE
OPU
12 Keys
Dialpad
Other Keys
LEDs
LCD