43
4.2. Power AMP (MAIN UNIT)
No sound is output.
The protector operates.
Is the power transistor open or short-
circuited?
2SB1560/2SD2390
Is the emitter resistance of the power
transistor open?
0.47 Ω
Is the base resistance of the power
transistor open?
4.7 Ω
Is the trimmer potentiometer between the
base of the power transistor open?
1k Ω
Is other transistor trouble?
Is other resistance trouble?
Turn on the power, check that voltage of the section is normal and that idling electric current is
flowing.
Replace the power transistor.
Replace the transistor.
Replace the resistance.
Replace the emitter resistance.
Replace the base resistance.
Replace the trimmer potentiometers.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
Summary of Contents for AVR-S510BT
Page 8: ...Personal notes 8 ...
Page 49: ...49 LEVEL DIAGRAM AVR S518BT X520BT X518CI LEVEL1 DIAGRAM ...
Page 50: ...50 AVR S518BT X520BT X518CI LEVEL2 DIAGRAM ...
Page 51: ...51 AVR S518BT X520BT X518CI LEVEL3 DIAGRAM ...
Page 52: ...52 AVR S518BT X520BT X518CI LEVEL4 DIAGRAM ...
Page 53: ...53 AUDIO BLOCK DIAGRAM AVR S518BT X520BT X518CI ANALOG AUDIO DIAGRAM ...
Page 55: ...55 VIDEO BLOCK DIAGRAM AVR S518BT X520BT X518CI VIDEO BLOCK ...
Page 56: ...56 POWER BLOCK DIAGRAM AVR S518BT X520BT X518CI VCC DIAGRAM ...
Page 89: ...89 CS497024CVZ DIGITAL IC741 ...
Page 92: ...92 CS42528 CQ DIGITAL IC744 CS42528 Block diagram ...
Page 93: ...93 CS42528 Terminal Functions ...
Page 95: ...95 NJU72340A DIGITAL IC761 NJU72340A Terminal Functions ...
Page 102: ...102 MX25L1606EM2I 12G USB IC904 MX25L1606EM2I 12G Terminal Functions BD82065FVJ USB IC905 ...
Page 104: ...104 2 FL DISPLAY FLD 018BT021GINK FRONT FL101 PIN CONNECTION GRID ASSIGNMENT ...
Page 105: ...105 ANODE CONNECTION ...