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4-4
Controller Board
ModB/Vstby Supply
Under various conditions, the supply to the ModB/Vstby would vary. Table 4-1 shows these
conditions and circuits in operation.
Table 4-1: ModB/Vstby Supply Modes
Condition
Circuit Operation
Radio On
Vdd supply voltage via CR411
Radio Off
• Vdd turned off
• Q416 gate is pulled low by R462
• Q416 is switched on
• U410 supplies 3.2V to ModB/Vstby
Primary battery removed
• Vdd turned off
• Q416 gate is pulled low by R462
• Q416 is switched on
• LiO battery provides 3.2V to ModB/Vstby
Flash Mode
• Boot_Ctrl line pull low
• ModA & ModB goes low
• Processor in boot-strap mode
• Flashing enabled
Содержание GP328
Страница 1: ...GP328 GP338 Portable Radios Detailed Service Manual 6804110J64 F June 2002 ...
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Страница 20: ...2 2 Recommended Test Tools ...
Страница 22: ...3 2 Error Codes ...
Страница 60: ...5 4 Parts List Keypad Basic ...
Страница 76: ...6A 14 Notes For All Schematics and Circuit Boards ...
Страница 120: ...6B 14 Notes For All Schematics and Circuit Boards ...
Страница 230: ...6D 36 Circuit Board Schematic Diagrams and Parts List ...
Страница 248: ...6E 12 Notes For All Schematics and Circuit Boards ...
Страница 270: ...7 4 Parts List for Universal Connector Flex ...