Nokia 616 Service Manual page 186

TFE-4/RV-1
TF5 Technical Information
The VWAKE Power supply is realized by a 5V-fixed linear regulator.
The realization of the VMIC switch is shown in Figure 6 and 7. It is realized by using a
double FET and in addition a part of double transistor V306. VMIC is activated when
VMICONX is driven to Ground by either B2BHFMutex or B2BHDMutex signal. Those are
in active at about 1.8V level and inactive 0V. VMIC can be proved on Test point J115,
B2BHFMutex and B2BHDMuteX can be activated by Test pattern TP416, #1 and #6.
VMIC is high, when one of both signals is high (OR logic).
Figure 6: VMIC switch (a) VMICONX driven low by B2BHFMUTEX
Figure 7: VMIC switch (b) VMICONX driven low by B2BHDMUTEX
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Figure 5: Vwake Power supply
VWAKE
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Issue 2.0 Mar/2005