Toshiba P600DL service manual DMD Driver PCB

ELECTRIC CIRCUIT EXPLANATION

2. DMD Driver PCB

The processed digital signal is sent from the RGB/Control PCB to the DMD Driver PCB via the 96-pin digital signal cable. The TI driver IC controls to signal supplied to the DMD through frame memory buffers.

3.Power Supply PCB

The power supply consists of two sections, Power Factor Control and DC-DC conversion. Incoming AC is rectified and supplied to the PFC converter where the resulting power factor is 1.

The output of the PFC circuit is 370V DC and this is supplied to the main and standby DC-DC converters and also the Lamp Ballast.

The outputs of the main DC-DC converter are +12V and +4V, the outputs of the standby DC-DC converter are +12V and +5V.

Over-voltage protection is triggered when the +4V supply rises above +6.3V. SCR201 is controlled by ZD201 and this triggers the protection circuit.

Short circuit protection of the +12V and +4V lines is monitored by IC101 pin3 and the +12V and +5V standby lines are monitored by IC104 pin5

4.Lamp Ballast PCB

The Philips® 120W UHP lamp is driven by Philips ballast power supply, input voltage is 370V DC and high voltage trigger and lamp supplies are output.

5.RS232C Control PCB

RS232C control signals and remote control from optional CT90000 are accepted, if both are connected CT90000 has priority.

6.Video PCB

Accepts PAL/NTSC composite video signal and has a buffered output for loop-through.

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