Diagrams - Sony NW-E8P Service Manual

Description of each Mode ( : indication on display)
LCD check Check the condition of indication by all display is lit or not.
Bx key : check start
Flash memory bad block check OK : FL OK The back light turns on
NG : FL NG The back light turns on and off
AVLS key : select the destination
AR J (AEP, E).
Bx key : Enter the destination
Destination setting
OK : WT OK The back light turns on
NG : WT NG The back light turns on and off
Display t LC45
Contrast adjustment
R
contrast value (Initial value : 45)
>, . key : Select the contrast value.
Bx key : Enter the contrast value.
Normally, do not perform this adjustment.
Low voltage check Low voltage detection check
OK : LB OK The back light turns on
NG : LB NG The back light turns on and off
Battery high voltage detection check
High DC detection check OK : HD OK The back light turns on
NG : HD NG The back light turns on and off
Battery low voltage detection check
Low DC detection check OK : LD OK The back light turns on
NG : LD NG The back light turns on and off
The regulated DC power supply voltage supplied to USB connector on checking each voltage value.
OK NG
Low voltage check 0.9V 1.0V or more
High DC detection check 7.0V or more 6.0V or less
Low DC detection check 4.0V or less 5.0V or more
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1 / W or less unless otherwise
4
specified.
• : B+ Line.
• Power voltage is dc 1.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground in
playback mode.
no mark : PLAY
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
J
: DIGITAL
F
: ANALOG
* Replacement of IC710 used in the set requires a spe-
cial tool.
• The voltage and waveform of CSP (chip size package)
cannot be measured, because its lead layout is different
form that of conventional IC.
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B) pattern face are indicated.
Parts face side: Parts on the parts face side seen from the
(Side A) parts face are indicated.
• Main board is six-layer printed board.
However, the patterns of layers 2 to 5 have not been
included in this diagrams.
* Replacement of IC710 used in the set requires a spe-
cial tool.
• Lead Layouts
surface
Lead layout of
conventional IC
CSP (chip size package)
9 9
SECTION 5

DIAGRAMS

Waveforms
z
— MAIN SECTION —
1
1Vp-p
22.5792MHz
VOLT/DIV : 0.5 V AC
IC701 <zb/ XTO
TIME/DIV : 0.2 nsec
— POWER SECTION —
2
2.8Vp-p
VOLT/DIV : 1 V AC
Q902 D
TIME/DIV : 20 µsec
3
3Vp-p
VOLT/DIV : 1 V AC
IC901 5 EXT
TIME/DIV : 20 µsec
4
2.2Vp-p
10 µ sec
VOLT/DIV :1 V AC
Q903 D
TIME/DIV : 5 µsec
NW-E8P