A good service manual with lots of info and a very fair price
Text excerpt from page 55 (click to view)
FAXPHONE B45/B40 Chapter 4: Maintenance & Service
2.3 Errors not shown on display 2.3.1 General errors ·No power (1) Check that the power cord is properly connected. (2) Check the connection between the SCNT board (J151) and the power supply unit. (3) Check the power supply unit fuse (F1). (4) Replace the power supply unit. ·Abnormal display Nothing displayed (1) Check the connection between the control panel unit and the SCNT board (J202). (2) Replace the control panel unit. (3) Replace the SCNT board. Part of the LCD does not display (1) Check the connection between the control panel unit and the SCNT board (J202). (2) Replace the control panel unit. (3) Replace the SCNT board. · Operation panel buttons do not work (1) If test mode can be used, check which buttons do not work. (2) Check the connection between the control panel unit and the SCNT board (J202). (3) Replace the control panel unit. (4) Replace the SCNT board. · No sound from speaker (1) Check the connection between the speaker and the PCNT board (J152). (2) Replace the speaker. (3) Replace the SCNT board.
