Power Supply - Sony DVP-NS300 Training Manual

Power Supply

The 5 th Generation power supplies have the following features:
•
No STANDBY circuit (Hard wire ON / OFF switch SW101).
•
Simple MAIN POWER SUPPLY circuit. Q101 = switching osc. Q102 / PC101 / IC301 = feedback.
•
Simple Stdby/Power ON controll.
Figure 3-1 shows a block diagram of the power supply:
HS15S1E BOARD: AEP, UK, AUS, E, EA, HK, KP, ME, RUS, SP, CH
(SEE PAGE 4-53)
HS15S1U BOARD: US, CND
(SEE PAGE 4-61)
HS15S1J BOARD: TW
(SEE PAGE 4-57)
SW101
POWER
F101
AC IN
L101
1
LINE
2
FILTER
CN101
Power ON Operation
The power supply circuitry before T101 (Primary) and after (Secondary) are explained. Refer to Figures 3-1 for
the block diagram. The load and additional regulators are shown in Figure 3-2.
Primary
After closing main switch SW101, oscillator circuit Q101 and the primary coils of T101starts. Regulation comes
from sampling the secondary +3.3 V at L611. The sample is sent to inverter/shunt regulator IC301, to the opto-
coupler PC101 and finally back to oscillator Q101.
EVER +3,3V from Q411 is switched via the other leg of SW101 and is applied to power ON LED D621 (RED)
drive. It is also applied to IC404/pin19 (not shown) as a P-DET signal. The output of IC404 controls the rest of
the power supply secondary circuit via the P-CONT line. EVER +3.3V powers IC404, IR remote receiver, cursor
stick and audio muting (all not shown).
Chapter 3 - Power Supply
US. CND. TW
EXCEPT
US. CND. TW
L102
LINE
FILTER
Q101, 102
OSC
EVER +3.3V
FIGURE 3-1 - POWER SUPPLY
D211 L211
D221 L221
L311
D311
P311
L611
D611
D413
T101
IC411
SHUNT
REG
L511
D511
IC301
SHUNT
REG
PC101
PHOTO
COUPLER
12
Q211
Q311
Q611
P611
Q411
+3.3V
D621 (ON/STANDBY)
REG
Q621, 622
LED DRIVE
Q712
POWER
CONTROL
3. Power Supply
SW
6 +11V
7
EVER +11V
13
+5V
12
SW
+3.3V
8
EVER
+3.3V
11
EVER
-11V
3
P-CONT
2
P-DET
1