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Daewoo DSJ4720 Manual

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Explanation for circuit operation
No. Position Kind Purpose Current Remark
1 T802 200V CRT AMP B+ 80mA
2 T802 135V HIGH VOLTAGE B+ 900mA F/B LINE
3 T802 12V GENERAL PURPOSE 600mA
4 T802 9V GENERAL PURPOSE 1000mA
5 T802 5V GENERAL PURPOSE 400mA
6 T802 5V GENERAL PURPOSE 750mA
7 T802 6.3V HEATER B+ 650mA
8 T803 +25V SUB-DY AMP B+ 900mA F/B LINE
9 T803 -25V SUB-DY AMP B+ 900mA
10 T803 30V GENERAL PURPOSE 100mA
11 T803 +7.5V GENERAL PURPOSE 100mA
12 T803 -12V GENERAL PURPOSE 300mA
13 T803 +15V AUDIO AMP B+ 2000mA
14 T803 -15V AUDIO AMP B+ 2000mA
15 T801 5V STAND-BY B+ 500mA
No. Position Kind Purpose Current Remark
<Table 1-1> The second power supply
< TABLE 1-1 > The second power supply
2-4 Explanation for power supply operation
1) Power supply and STAND-BY power
The voltage via a bipolarity power code (PC801) goes through a line filter area composed of
EMI filter (L801, L802, L827), X-capacitor (C801, C802, C803) and Y-capacitor (C804,
C805), is rectified and smoothed (C-806) in bridge diode (D801 -D804).
This voltage provides a power for STAND-BY trans (T-801) and TOP232P of STAND-BY
power IC (I801) and the second TRANS supplies a STAND-BY power for U-COM.
2) Main power start
When the U-COM supplies a PWR SWITCH ON signal for Q801 base via PA802 connector, a
positive terminal relay (RLY1) starts and AC power is rectified and smoothed (C809, C816) in
a bridge diode (D-808) via a Y-capacitor (C-811, C812).
The voltage before smoothing supplies a starting voltage for No.4 terminal of STR-F6656
(I802, I803) via (R809+R817) and (R823+R824).
When STR-F6656 starts, the voltage via a coil bead (L825, L826) goes to coil P of trans and
then to drain (Pin No.3) of internal power MOSFET of STR-F6655. The voltage flowing in coil
D supplies a power for terminal No.4 of trans STR-F6656.
Then, a current flows via R813 and R818 without going through (R809+R817) and
(R823+R824). That is, (R809+R817) and (R823+R824) supplies a current only at starting.
3) Specification of STR-F6656
The STR-F6656 is a power MOSFET and control IC built-in Fly-back type of Hybrid IC for
switching power.
The feature of this IC is a Quasi-Resonance associated operation IC that the number of parts
added to external is small, various protection functions (protection from overcurrent,
overvoltage and overheat) are offered and a power loss decreases by lowering an originating
frequency at STABD-BY.
… 16 …


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