Samsung SGH-Z370 Service Manual

Also see for SGH-Z370: User guide

SAMSUNG Proprietary-Contents may change without noticeFlow Chart of Troubleshooting and Circuit Diagrams3-16This Document can not be used without Samsung's authorization3-1-6. Speaker PartNo signalat the Pin#2, 4 of U302NOCheck the U302YESIs there signalat the R341 of U301No signalat the C345 of U301Is the Terminal ofSpeaker OK? CheckSpeakerTerminalYESNONOYESENDNOYESCheck the UCP100The type of sound from speakeris Melody or Key ToneYESSpeaker Phone Mode of Voice?YESNO NOCheck the Receiver PartCheck the U301The type of sound from speakeris Key Tone (from YMU) Check the R336, C351 orUCP100NOThe pin #7 of U300 = 2.8V andThe pin #32 of U300 = 2.6V?YESNOCheck the U300The pin #29 of U300 is High?NOCheck the UCP100There is No soundfrom ReceiverNo signalat the Pin#2, 4 of U302NOCheck the U302YESIs there signalat the R341 of U301No signalat the C345 of U301CheckSpeakerTerminalYESNONOYESENDNOYESCheck the UCP100The type of sound from speakeris Melody or Key ToneYESSpeaker Phone Mode of Voice?YESNO NOCheck the Receiver PartCheck the U301The type of sound from speakeris Key Tone (from YMU) Check the R336, C351 orUCP100NOThe pin #7 of U300 = 2.8V andThe pin #32 of U300 = 2.6V?YESNOCheck the U300The pin #29 of U300 is High?NOCheck the UCP100