7
DR-BT50
SECTION 3
DIAGRAMS
For schematic diagrams.
Note:
• All capacitors are in
µ
F unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
%
: indicates tolerance.
•
C
: panel designation.
•
A
: B+ Line.
• Power voltage are dc 3.7 V and fed with regulated dc
power supply from battery terminal.
• Voltages are dc with respect to ground under tolerances.
no mark
: STANDBY
(
)
: AC ADAPTOR IN
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
: AUDIO
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
Caution:
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
Pattern face side:
Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
For printed wiring boards.
Note:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
a
: Through hole.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• IC101 (CXN1450-2ABL), IC401 (WM8711LGEF/R) and IC451
(uPD78F0500FC(S)-AA3-A) on MAIN board cannot be replaced
individually.
Replace it with “MAIN BOARD, COMPLETE”.
• The voltage of IC101 and IC451 cannot be measured.
•
MAIN board is four-layer pritnted board. However, the patterns of
layer 2 and 3 have not been included in this diagrams.
IC203 XC6219B282MR
1
VIN
VSS
2
CE
3
VOUT
5
4
NC
R1
R2
-
+
ON/OFF
CONTROL
EACH
CIRCUIT
CURRENT
LIMIT
VOLTAGE
REFERENCE
• IC Block Diagram
Summary of Contents for DR-BT50 - Stereo Bluetooth Headset
Page 19: ...19 DR BT50 MEMO ...
