Service Manual

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Figure 4.8 VTL501 Logic Part Block Diagram
4.4 Power Up Sequence
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This section describes the steps how the TSM501 / VTL501 phone wakes up.
 Place a Battery Pack
The battery pack, which the protection circuit is implemented, is placed into the phone.
 Press and Hold [END] Key
The Power on circuit (SW124) generates the control voltage to be used for U6.
 Regulators Activated
U6 feeds 2.8V to MSM (U125), LCD
U6 feeds 2.8V to Flash ROM / SRAM (U113) and others.
U6 feeds 2.8V to VCTCXO(U104) and others.