Samsung SCX4521F Service Manual - Page 118
Fax & Phone Problems, No Dial Tone, 6.2 Defective MF DIAL
UPC - 635753616040
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Troubleshooting 6.6 Fax & Phone Problems 6.6.1 No Dial Tone • Description There is no dial tone when the On-Hook dial button is pressed. Check and Cause 1. Check that the telephone line cord supplied with the set is connected to TEL LINE correctly. 2. Listen for a CLICK sound when the OHD key is pressed. 3. Check the connection of the HARNESS between the LIU and the Main B'd. 4. Check that the SPEAKER is connected correctly. Solution 1. If the telephone cord is OK but there is no dial tone, try plugging a normal telephone into the wall socket. If this is OK then replace the LIU B'd. 2. If you cannot hear the OHD CLICK sound, the OPE Ass'y may be defective. Replace the OPE Ass'y. (If the key click sound if off, you cannot hear click sound even if OPE Ass'y has no problem on it) 3. Check the Speaker connection and the harness between the LIU and the Main PBA, replace as necessary. 4. Use Tech mode / Modem Test to check that the speaker and amplifier are working. Replace the Main B'd. 6.6.2 Defective MF DIAL • Description The MF DIAL is not functioning. Check and Cause 1. Check that the telephone line cord supplied with the set is connected to TEL LINE correctly. 2. Listen for a CLICK sound when the KEY is pressed. 3. Check the connection of the HARNESS between the LIU and the Main B'd. 4. Check that the SPEAKER is connected correctly. Solution 1. If the telephone cord is OK but there is no dial tone, try plugging a normal telephone into the wall socket. If this is OK then replace the LIU B'd. 2. If you cannot hear the OHD CLICK sound, the OPE Ass'y may be defective. Replace the OPE Ass'y. (After key click sound sets to "ON", and you can hear click sound) 3. Check the Speaker connection and the harness between the LIU and the Main PBA, replace as necessary. 4. Use Tech mode / Modem Test to check that the speaker and amplifier are working. Replace the LIU and Main B'd in sequence Notes: Product supports MF DIAL type only. Samsung Electronics Service Manual 6-23