Daewoo DWP-28W2ZZF Service Manual download pdf (Page 66)

Appendix Service manual WP-795

- 39 -

- When the DC supply voltage reaches (2.4V +0.6V ) =3.0V, Q510 starts conducting but as the Q511

base-emitter voltage is the same as the collector-emitter voltage of the saturated Q510, Q511 switches

off and no voltage reaches I501 pin 60.

- If the DC supply voltage decreases below 3 V, Q510 switches off immediately. Q511 starts conducting,

pulling I501 pin 60 high.

At the same time, it discharges the reset capacitor C501. Discharging this capacitor is necessary to

garantee a defined reset pulse duration.

2-9-2 TV normal run and stand-by mode operations

Depending on remote control commands, I501 microcontroller part pin 63 (power) is set to:

- high for normal run mode

- low for stand-by mode

2-9-2-1 TV on normal run mode

2-9-2-1-1 I501 microcontroller part pin 63 (power) effect

I501 microcontroller part pin 63 (power) is connected to the following circuit:

1 2 ... 61 62 63 64 65 66 67 68 69 70

No comments

Daewoo DWP-28W2ZZF Service Manual Page 66