4.2. Power AMP
No sound is output.
The protector operates.
Is the power transistor open or short-
circuited?
2SB1647/2SD2560
Is the emitter resistance of the power
transistor open?
0.47Ω
Is the base resistance of the power
transistor open?
22Ω
Is the trimmer potentiometer between the
base of the power transistor open?
1kΩ
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
YES
103
Summary of Contents for IN-Command AVR-X4000
Page 8: ...Personal notes 8...
Page 19: ...Personal notes 19...
Page 64: ...Personal notes Personal notes 64...
Page 110: ...Personal notes 110...
Page 164: ...Personal notes Personal notes 164...
Page 170: ...R5F3650KNFB DIGITAL IC231 170...
Page 181: ...AK5358BET DIGITAL IC451 AK5358BET Pin Function 181...
Page 194: ...2 FL DISPLAY FLD 17 BT 40GINK FRONT FL601 PIN CONNECTION GRID ASSIGNMENT Y2 q 194...
Page 195: ...ANODE CONNECTION 195...