2 ] Power Supply Circuit - Brother PT-D600 Service Manual

[ 2 ] Power Supply Circuit

As shown in the figure below, the power supply circuit uses two linear regulators and
one Boost regulator.
For linear regulator, one is S-816A33AMC-BAIT2U that stabilizes the battery output
(VBT) to supply the 3.3BV power (3.3V ±2%) to the CPU and all keys.
The other is R1190S033D-E2-FE that stabilizes the battery output (VBT) to supply the
3.3VCC power (3.3V ±2%) to the LCD module, Flash Rom, SRAM and all logic
circuits except CPU and all keys.
For Boost regulator, it is TPS61160DRV that stabilizes the battery output (VBT) to
supply the VBLH (min 16.152V) to the Backlight LEDs.
The power supply circuit is so designed that batteries supply power to the memories
to retain their contents even if the specified AC adapter being connected to this
machine is unplugged from the wall socket.
-AC adapter (12V 2A)
DC_ jack
AD-E001 **
-Battery 1.5V×6 9V
AA ALKALINE LR6
AA Ni-MH HR6
VBT
Figure 2.2-3 Power Supply Circuit
II - 13
VBLH
Boost
regulator IC
3.3BV
3.3V linear
regulator IC
3.3VCC
3.3V linear
regulator IC
VH
VH control circuit
FET
-LED for backlight
-CPU
-Reset IC
-ON/OFF key
-AC adapter detection circuit
-FROM
-SRAM
-Thermal head
-LCD module
-All keys (except ON/OFF key)
-Side sensor, color sensor, cutter sensor
and cover open sensor
-All temperature sensors
-Logic IC for USB function circuit
-Tape feed motor drive
-Thermal head
-Cutter motor drive