80
4.2. Power AMP (7CH AMP B'D)
No sound is output.
The protector operates.
Is the power transistor open or short circuit?
2SB1647/2SD2560
Is the emitter resistance of the power
transistor open?
0.47Ω
Is the base resistance of the power
transistor open?
22Ω
Is trimmer potentiometer between the base
of the power transistor open?
1kΩ
Is the zener diode and diode which are
connected with the base of a power
transistor short-circuited?
MTZJ4.7B
1SS133
Is other transistor trouble?
Is other resistance trouble?
Turn on 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.
Replace the Zener diode and the diode.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
Summary of Contents for AirPlay AVR-3311CI
Page 46: ...46 Personal notes Personal notes ...
Page 150: ...Personal notes Personal notes 150 ...
Page 157: ...157 R5F3650KNFB HDMI U5500 ...
Page 164: ...164 IS42S32200E6TL HDMI U1602 IS42S32200E6TL Block diagram ...
Page 173: ...173 AK4424ET HDMI U3800 U3801 AK4424ET Block Diagram ...
Page 174: ...174 AK5358BET HDMI U3802 AK5358BET Pin Function ...
Page 178: ...178 HY27UF081G2A TPCB Block Diagram ...
Page 187: ...187 NJW1194A AUDIO IC3007 IC3011 BLOCK DIAGRAM ...
Page 188: ...188 2 FL DISPLAY FLD 19 ST 03GINK FRONT FL601 PIN CONNECTION GRID ASSIGNMENT ...
Page 189: ...189 ANODE CONNECTION ...
Page 216: ...216 Personal notes ...