Microphone Part - Samsung SGH-Z107 Service Manual

F low Chart of Troubleshooting

4. Microphone Part

S p ea ker d o es n o t w o rk
Y es
U 510 p in 7,32 = 2.8V?
Y es
C h ec k th e C lo c k s ig n al at
P in1 o f U 510 (13.5M H z)
Y es
U 510 p in 4 ¡Ö2.8V?
(W h enU 509 o p erate)
Y es
U 510 p in15
¡ÖB attery Vo lt ?
Y es
Is S p eaker w o rkin g ?
Y es
E N D
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N o
R es o ld er o r rep lace U 768
N o
C h eck th e clo c k g en eratio ncircu it
(relatedto U 404 an dU 510)
N o
N o
C h eck th e circu it relatedto
N o
7- 6
R es o ld er U 509
" A M P +/A M P -" s ig n al
C h an g e th e S p eaker