Circuit Descriptions
6-2
•
Advantages and disadvantages of linear power supply
1) Advantages : Little noise because the output
waveform of transformer is sine wave.
2) Disadvantages :
1
Additional margin is required because Vs is chan-
ged (depending on power source). (The regulator
loss is caused by margin design).
2
Greater core size and condensor capacity are ne-
eded, because the transformer works on a single
power frequency.
6-1-1 (b) S.M.P.S. (Pulse width modulation method)
v
Vreg
Vout
0
t
Change by common power
Regulator loss
Fig. 6-5
•
Terms
1) 1st : Common power input to 1st winding.
2) 2nd : Circuit followings output winding of transformer.
3) f (Frequency) : Switching frequency (T : Switching cycle)
4) Duty : (Ton/T) x 100
Transformer
Vout
(Np)
(Vp)
Switch
Vs switch
I switch
Vin
ON/OFF Control
+
–
+
–
+
+
+
–
(Vs)
(Ns)
REGULATOR
Fig. 6-6
Summary of Contents for DV-P303U
Page 29: ...Reference Information 2 22 MEMO ...
Page 31: ...Product Specification 3 2 MEMO ...
Page 49: ...5 14 Disassembly and Reaasembly MEMO ...
Page 69: ...Circuit Descriptions 6 20 MEMO ...
Page 79: ...Troubleshooting 7 10 MEMO ...
Page 80: ...8 1 8 Exploded View 8 1 Cabinet Assembly 8 2 Deck Assembly Page 8 2 8 3 ...
Page 82: ...8 3 Exploded Views 8 2 Deck Assembly 107 906 ...
Page 83: ...Exploded Views 8 4 MEMO ...
Page 85: ...9 2 Replacement Parts List MEMO ...
Page 87: ...PCB Diagrams 1 11 1 Main COMPONENT SOLDER SIDE ...
Page 88: ...PCB Diagrams 2 11 2 Jack ...
Page 89: ...PCB Diagrams 3 11 3 Key 11 4 Deck ...
Page 90: ...12 1 12 Wiring Diagram ...
Page 91: ...Wiring Diagram 12 2 MEMO ...
Page 93: ...Schematic Diagrams 13 2 13 1 Power ...
Page 94: ...Schematic Diagrams 13 3 13 2 Main Micom ...
Page 95: ...Schematic Diagrams 13 4 13 3 Servo ...
Page 96: ...Schematic Diagrams 13 5 13 4 Video ...
Page 97: ...Schematic Diagrams 13 6 13 5 Audio ...
Page 98: ...Schematic Diagrams 13 7 13 6 RF ...
Page 99: ...Schematic Diagrams 13 8 13 7 ZiVA ...
Page 100: ...Schematic Diagrams 13 9 13 8 DSP ...
Page 101: ...Schematic Diagrams 13 10 13 9 Front Micom VFD Display ...
Page 102: ...Schematic Diagrams 13 11 13 10 Key ...
Page 103: ...Schematic Diagrams 13 12 13 11 Deck ...
Page 104: ...Schematic Diagrams 13 13 13 12 Remote Control ...
Page 105: ...Schematic Diagrams 13 14 MEMO ...