77
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?
0.47
Ω
Is the base resistance of the power
transistor open?
22
Ω
Is trimmer potentiometer between the base
of the power transistor open?
1k
Ω
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
fl
owing.
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
Содержание AVR-2311
Страница 5: ...5 DIMENSION 344 434 16 155 171 21 4 20 7 54 7 214 5 338 9 381 44 2 102 18 5 34 5 266 ...
Страница 15: ...15 Personal notes ...
Страница 46: ...46 Personal notes Personal notes ...
Страница 151: ...151 R5F3650KNFB HDMI U5500 ...
Страница 156: ...156 IS42S32200E6TL HDMI U1602 IS42S32200E6TL Block diagram ...
Страница 165: ...165 AK5358BET HDMI U3802 AK5358BET Pin Function ...
Страница 178: ...178 2 FL DISPLAY FLD 19 ST 03GINK FRONT U101 PIN CONNECTION GRID ASSIGNMENT ...
Страница 179: ...179 ANODE CONNECTION ...