DR-BT1/BT1K
4
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 (Headset) or dc 1.2 V (Adap-
tor) and fed with regulated dc power supply from battery
terminal.
• Voltages are dc with respect to ground under tolerances.
no mark
: STANDBY
(
)
: TALKING
<
>
: 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.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• MOD2 (bluetooth module), IC7 (+2.8V REG) on HEADSET board
cannot be replaced individually.
Replace it with “HEADSET BOARD, COMPLETE”.
• MOD1 (bluetooth module) on ADAPTOR board cannot be replaced
individually.
Replace it with “ADAPTOR BOARD, COMPLETE”.
• MOD2 (bluetooth module), IC7 (+2.8V REG) on HEADSET board
cannot be replaced individually.
Replace it with “HEADSET BOARD, COMPLETE”.
• MOD1 (bluetooth module) on ADAPTOR board cannot be replaced
individually.
Replace it with “ADAPTOR BOARD, COMPLETE”.
•
HEADSET board is four-layer pritnted board.However, the patterns
of flayer 2 and 3 have not been included in this diagrams.
