Toshiba TDP-MT700 Manual de servicio - Página 16
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MT700 Service Manual
The DAD1000 will generate DMD reset signals MBRST[0..15] as well as
VCC2 (7.5V) for DMD chip.
4. Motor Controller SH6742:
The DDP1010 electronics support driving three phase, 12 poles, Y
configuration, brushless DC color wheel motor. The DDP1010 electronics
use a combination of back EMF from motor and the CWINDEX signal to
frequency and phase lock the color wheel revolution to 2.5 times of VSYNCZ
rate.
4.1.2.1. Fan control
In this projector, there are four fans for cooling the system.
i.
Fan 1 (Main Fan): for cooling the lamp, light pipe and color wheel
ii.
Fan 2 (Blower): for cooling the lamp,
iii.
Fan 3 (Power Fan): for cooling the power module and ballast
iv.
Fan 4 (DMD Fan): for cooling the DMD chip
1. Fan controller MAX6660:
The four fan controllers are used for controlling the four fans independently.
Each fan has a FANSPIN output to each fan controller. The fan controller
can use this signal to detect if the fan is spinning or not. If the fan stops, the
CPU will turn off the DMD RESETZ and PWRGOOD signals, then the DMD
system and Lamp will be turned off.
2. Thermal sensor on lamp box:
The thermal sensor on the lamp box is used for detecting temperature
around the Lamp box.
3. Intake thermal sensor:
The intake thermal sensor will sense the intake temperature. The CPU will
read temperature from the fan controller. The CPU will compare temperature
of lamp box sensor and temperature of intake sensor, then control the speed
of fans. If temperature is out of limit, the CPU will turn off the projector
system.
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