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NW-E40X/E50X
OPERATION MANUAL
NEW TECHNICAL THEORY
FOR SERVICING
NETWORK WALKMAN
Internal Use Only
2
TABLE OF CONTENTS
Section Title Page
1. Power Control Circuit ................................................................................. 3
1-1. Generated Voltages List ............................................................................... 3
1-2. Power control circuit when the unit is not connected to PC ............................ 5
1-3. Reset Circuit ................................................................................................ 6
1-4. Start-up of SYSTEM CONTROLLER IC400................................................... 7
2. Charging Circuit ......................................................................................... 8
2-1. Charging Circuit ........................................................................................... 8
3. Playback Circuit........................................................................................ 11
3-1. Operation during Playback ........................................................................ 11
4. Appendix................................................................................................... 13
4-1. TEST POINTS ........................................................................................... 13
NOTE ON HANDING THIS MANUAL
The contents described in this manual are prohibited from using outside Sony Corporation. Copying the data and reprinting the data in this PDF file to other
homepages are strictly forbidden.
homepages are strictly forbidden.
For NW-E503/E505/E507, FM TUNER IC2001 is mounted.
The circuit operation of NW-E40X/E50X is the almost same as that of NW-E50/E70/E90. Refer to the following operation manual.
The different points are mentioned in this manual.
- NW-E75/E95 Operation Manual (Japanese): 9-879-148-01
- NW-E50/E70/E90 Operation Manual (English): 9-877-750-01
The different points are mentioned in this manual.
- NW-E75/E95 Operation Manual (Japanese): 9-879-148-01
- NW-E50/E70/E90 Operation Manual (English): 9-877-750-01
Copying is strictly prohibited
3
1. Power Control Circuit
1-1. Generated Voltages
Fig.1-1 shows the outline of the power supply circuit.
The following eight types of voltage are generated by this unit.
1. BATT+ voltage (Battery voltage)
This voltage is supplied from the battery during the battery driving.
2. UNREG voltage -> Charge Control IC501 (When the unit is not connected to PC: Battery voltage / When the unit is connected to PC: V_BUS voltage)
Driving voltage for +2.8V Regulator IC503/IC506 and +1.2V Regulator IC505.
3. VDD_AD2.3 voltage -> +2.3V Regulator IC509
This voltage is used inside SYSTEM CONTROLLER IC400 and is +2.3[V].
Driving voltage for HP AMP. IC301 (+2.3[V])
Driving voltage for HP AMP. IC301 (+2.3[V])
4. VDD_IO voltage -> +2.8V Regulator IC506
This voltage is used inside SYSTEM CONTROLLER IC400 and is +2.8[V].
Driving voltage for Organic EL Display Block
Driving voltage for NOR FLASH SRAM IC450
Driving voltage for NAND FLASH RAM IC461
Driving voltage for Organic EL Display Block
Driving voltage for NOR FLASH SRAM IC450
Driving voltage for NAND FLASH RAM IC461
(Actually, VDD_IO voltage is controlled by the control signal output from pin-174 [P13] of SYSTEM CONTROLLER IC400 shown in Fig.1-1.)
5. VDD_RTC2.8 voltage -> +2.8V Regulator IC503.
Driving voltage for RTC (Real Time Clock) IC401 (+2.8[V])
6. VDD_CORE voltage -> +1.2V Regulator IC505
This voltage is used inside SYSTEM CONTROLLER IC400 and is +1.2[V].
7. V_BUS voltage
This voltage is supplied from PC and is +5.0[V].
8. VDD_USB3.3 voltage -> Charge Control IC501
This voltage is used for the USB interface circuit inside SYSTEM CONTROLLER IC400 and is +3.3[V].
Copying is strictly prohibited
4
Fig.1-1 Power Control Circuit