Ricoh AC205, Service Manual

Page: 114 / 188

FAX AND PHONE PROBLEMS
B273 4-28 SM
4.6 FAX AND PHONE PROBLEMS
4.6.1 NO DIAL TONE
Description: No dial tone when the “On-Hook Dial” (OHD) button is pressed.
Cause Solution
1. Telephone line cord is not securely
connected to the TEL LINE.
2. No “click” sound is heard when the OHD
key is pressed.
3. Faulty harness connection between the
LIU and the main board.
4. Speaker is not correctly connected.
1. Test the wall socket by plugging in a
standard telephone. Replace the LIU
board if the wall socket is operational.
2. Replace the operation panel assembly if
you don’t hear the “click” sound.
3. Examine the speaker connection harness
between the LIU and the main power
board.
4. Use Tech Mode/Modem Test to check if
the speaker and amplifier function
correctly. Replace the main board if the
speaker and amplifier operate correctly.
4.6.2 DEFECTIVE MF DIAL
Description: MF Dial does not function correctly.
Cause Solution
1. Telephone line cord is not securely
connected to the TEL LINE.
2. No “click” sound is heard when the OHD
key is pressed.
3. Faulty harness connection between the
LIU and the main board.
4. Speaker is not correctly connected.
1. Test the wall socket by plugging in a
standard telephone. Replace the LIU
board if the wall socket is operational.
2. Replace the operation panel assembly if
you don’t hear the “click” sound.
3. Examine the speaker connection harness
between the LIU and the main power
board.
4. Use Tech Mode/Modem Test to check if
the speaker and amplifier function
correctly. Replace the LIU and main
board in sequence if the speaker and
amplifier function correctly.