12.2 CABLE DIAGRAM
ITEM: PART NO: DESCRIPTION: CODE:
A 9JB30017144 CONN ASSY 8P 30CM W/FERRRITE (TMM)ROHS
B 9JB30018384 CNAS 5P/150 SIS W/C+BRT UL1007AWG24
C 9JB30018953 POWER CORD SAFE ASSY.(1.8MT W/FTZ)-ROHS
D 9JB30016836 CNAS 6P/230 SIS W/C+BRT+FER UL1007AWG24
E 9JB30022665 CNAS 11P/150 DVD SIS W/DC UL1007#26 ROHS
13 CIRCUIT DESCRIPTION
13.1 POWER SUPPLY
-Socket PL2 is the 220VAC input.
-Socket PL3 is used for the power button on the front panel.
-3.15A fuse F1 is used to protect the device against short circuit.
-Voltage is rectified by using diodes D1, D2, D3 and D4. Using capacitor C33 (47?f) a DC voltage is
produced. (310- 320VDC).
- The current in the primary side of the transformer TR2 comes to the SMPS IC (TNY267P). It has a built-
in oscillator, over current and thermal protection circuitry and runs at 133kHz. It starts with the current from
the primary side of the transformer and follows the current from the feedback winding.
- Voltages on the secondary side are as fo llows: 12 Volts at pin11 at C42, 5 Volts at C40,3.3 Volts at C38,
-22Volts at C44,-12 Volts at D22.
-D14 TL431 is a constant current regulator. TL431 watches the 5 volts and supplies the required current to
IC2. There are a LED and a photo transistor in IC2. The LED inside the IC2 transmits the value of the
current from D25 to phototransistor. Depending on the current gain of the phototransistor IC3 keeps the
voltage on the 5-volt-winding constant.
--22 Volts is used to feed the VFD (Vacuum Fluorescent Display) driver IC on the front panel.
1155 |
ACEC
SHARP
