VK Quality Group GSM C/S
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Service Guidelines
Service Guidelines
• Precise adjustment should be made in a shield box or shield room where spurious
noise has been eliminated.
• When using magnetized tools, note that related magnetic elements may cause
malfunctioning of critical parts (such as IC).
• Use a twisted pair wire of thick type when measuring level. Using such a thick
twisted pair wire could reduce the measurement error as the wire contains less RF
resistance.
• When disassembling the phone set, you must use a driver tool meeting standard
requirements.
• When making repairs with power on after connecting the test package, note that
dangers such as overcurrent, parts deterioration caused by short-circuit may occur.
• Note that PCB land may be detached due to overheating of a soldering iron while
making repairs on board status.
• Any additional devices that cause the change of performance shall not be added
to this phone, as registered.
Summary of Contents for VK4500
Page 1: ...VK Quality Group GSM C S GSM GSM SERVICE MANUAL SERVICE MANUAL VK4500 VK4500 ...
Page 11: ...VK Quality Group GSM C S Appearance Appearance ...
Page 12: ...VK Quality Group GSM C S Icons Icons ...
Page 13: ...VK Quality Group GSM C S Icons Icons ...
Page 14: ...VK Quality Group GSM C S Icons Icons ...
Page 15: ...VK Quality Group GSM C S LCD Panel LCD Panel ...
Page 26: ...VK Quality Group GSM C S Battery Rear Case Battery Rear Case Disassembling Disassembling ...
Page 30: ...VK Quality Group GSM C S Main PCB Main PCB Disassembling Disassembling ...
Page 32: ...VK Quality Group GSM C S Lower Case Lower Case Ass Ass y y Disassembling Disassembling ...
Page 36: ...VK Quality Group GSM C S LCD LCD Ass Ass y y Disassembling Disassembling ...
Page 54: ...VK Quality Group GSM C S Battery Charger Block Battery Charger Block ...
Page 56: ...VK Quality Group GSM C S Main PCB Main PCB Top Top Bottom Bottom ...
Page 57: ...VK Quality Group GSM C S Module Area Module Area ...
Page 58: ...VK Quality Group GSM C S RF Area RF Area ...
Page 59: ...VK Quality Group GSM C S BASEBAND Area BASEBAND Area ...
Page 74: ...VK Quality Group GSM C S TX Power Trouble E TX Power Trouble E GSM GSM ...
Page 75: ...VK Quality Group GSM C S RX Sensitivity Trouble E RX Sensitivity Trouble E GSM GSM ...
Page 76: ...VK Quality Group GSM C S RX Sensitivity Trouble E RX Sensitivity Trouble E GSM GSM ...