Sony NW-E403 / NW-E405 / NW-E407 / NW-E50 / NW-E503 / NW-E505 / NW-E507 / NW-E70 / NW-E90 Service Manual ▷ View online
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CHARGE CONTROL IC501 outputs status signals shown in Table.2-4 while charging. In this unit, only XSTAT1 signal is used. This means that System Controller IC400
monitors if IC501 is charging or not.
Table.2-4 Status signal
IC501 Pin-2 [XSTAT1]
IC501 Pin-3 [XSTAT2]
Status
L
L
When pre-charging
L
Open
When normal-charging
Open
L
When the charging operation terminates
Open
Open
Error Status
Battery is not connected
Detecting the abnormal temperature
Detecting the timer fault
Etc.
Table.2-5 Monitoring the charging operation by SYSTEM CONTROLLER IC400
IC400 Pin-85 [PF4]
Status
L
When charging
H
When the charging operation terminates
Table.2-6 Charging Current
Power Source
Pre-charging
(Until BATT voltage becomes 3[V])
(Until BATT voltage becomes 3[V])
Constant-Current Charging
Remark
USB (500mA – Permit)
Approx. 50mA
Approx. 430mA
Varies depending on conditions. The left
values are when connecting with PC
without transferring data
values are when connecting with PC
without transferring data
USB (100mA – Permit)
Approx. 50mA
Approx. 90mA
Varies depending on conditions.
Note:
The actual charging current of USB charge varies depending on the system conditions. It will be as follows.
[Each VBUS limit current] – [Current consumed by the system] = [Actual charging current]
[Each VBUS limit current] – [Current consumed by the system] = [Actual charging current]
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Fig.2-1 Charging Circuit
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3. Playback Circuit
3-1. Operation during Playback
Playback Circuit is shown in Fig. 3-1.
1. System Controller IC400
System Controller IC400 outputs analog signals; L-ch from pin-134 [AOUTL] and R-ch from pin-133 [AOUTR].
System Controller IC400 outputs analog signals; L-ch from pin-134 [AOUTL] and R-ch from pin-133 [AOUTR].
2. HEADPHONE AMPLIFIER IC301
The L-ch and R-ch analog signals that are output from SYSTEM CONTROLLER IC400 are output from the HEADPHONES JACK J301 via HEADPHONE AMPLIFIER IC301.
The HEADPHONE AMPLIFIER IC301 has the power switch function and MUTE function etc. Table.3-1 shows the power control by SYSTEM CONTROLLER IC400.
The L-ch and R-ch analog signals that are output from SYSTEM CONTROLLER IC400 are output from the HEADPHONES JACK J301 via HEADPHONE AMPLIFIER IC301.
The HEADPHONE AMPLIFIER IC301 has the power switch function and MUTE function etc. Table.3-1 shows the power control by SYSTEM CONTROLLER IC400.
Table.3-1 Power control by SYSTEM CONTROLLER IC400
Description of terminal
IC400 pin-146 [PQ0]
Turning “on” and “off” the POWER SWITCH function inside HEADPHONES AMPLIFIER IC301
(H: “ON”, L: “OFF”)
(H: “ON”, L: “OFF”)
IC400 pin-147 [PQ1]
Reset signal for HEADPHONES AMPLIFIER IC301 (L:RESET)
IC400 pin-148 [PQ2]
MUTE control signal for HEADPHONES AMPLIFIER IC301 (H:MUTE)
In addition, IC301 corresponds to 2 Inputs and 1 Output. In NW-E50X series, FM Tuner IC2001 is mounted. And analog signals output from IC2001 are input to HP Amp.
IC301. System Controller IC400 controls which analog signals is output from IC301 by outputting the serial command to IC301. IC400 also controls BEEP by sending the
serial command to IC301.
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Fig.3-1 playback Circuit
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