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Old 17th November 2006, 06:44 PM   #1
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Default bias for pioneer a400?

any info., 5mv? 10mv?

service manual?, thanks
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Old 17th November 2006, 06:47 PM   #2
lineup is offline lineup  Sweden
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Default Re: bias for pioneer a400?

Quote:
Originally posted by lt cdr data
any info., 5mv? 10mv?

service manual?, thanks
What output transistors?
What resistance have emitter resistors to those?
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Old 17th November 2006, 09:07 PM   #3
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ok, I have a schematic, but no info. as to bias,

2sc3298 and 2sa1306

emitter resistors are 0.33 ohm.

cheers...
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Old 17th November 2006, 09:53 PM   #4
AKN is offline AKN  Sweden
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Hi lt cdr data,

Quote:
2sc3298 and 2sa1306
These transistors are drivers, not output transistors.
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Old 18th November 2006, 02:23 PM   #5
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oops, bit hard to read...

they are 2sc3281 and 2sa1302
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Old 18th November 2006, 04:06 PM   #6
jkeny is offline jkeny  Ireland
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Here's the schematic http://www.hifiengine.com/library_mo...ted_model=A400

John
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Old 18th November 2006, 09:46 PM   #7
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Hi to all

In the schematic the indications for voltage drop across the emitter resistors is :
13.5 mV for the 2SC emitter resistor
12.5 mV for the 2SA emitter resistor

With .33 Ohms emitter resistor the idle current is about 40 mA.
Warmest regards

Vittorio
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Old 18th November 2006, 10:02 PM   #8
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Here is the partial schematic
Attached Files
File Type: pdf pioneer_a400_a400x_schem.pdf (96.8 KB, 98 views)
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