Yamaha DSP-AX620 Service Manual

DSP-AX620
DSP-AX620
28
■ AMP CHECK
● Confirmation of Idling Current
1) No signal applied.
2) Non-loaded condition.
3) Aging is not neccessary.
Test Point
R145
R150
R165
R155
R160
Rating (DC)
0.1mV—10mV
Note
Item
MAIN L
MAIN R
CENTER
REAR L
REAR R
If the measured voltage exceeds 10.1mV, cut
the lead wire of R105(L ch), R112(R ch),
R133(C ch), R119(RL ch) or R126(RR ch) and
then check again if each measured value
satisfies the rating.
* Confirm that the idling current is 0.2mV — 15mV after 60 minutes.
Note)
• If R105(L ch), R112(R ch), R133(C ch), R119(RL ch) or R126(RR ch) have already been
cut off and idling current does not flow, reconnect R105(1kΩ), R112(1kΩ), R133(1kΩ),
R119(1kΩ) or R126(1kΩ).
• Q101, Q102, Q103, Q104 and Q105 are transistors for temperature correction. Apply silicone
grease to the contact surface with the heat sink.
Cut OFF
R105 (L ch)/R112 (R ch)/
R133 (C ch)/R119 (RL ch)/
R126 (RR ch)
0.1mV — 10mV (DC)
0.1mV — 10mV (DC)
R145 (L ch)
R150 (R ch)
R165 (C ch)
R155 (RL ch)
R160 (RR ch)
● Test Point
MAIN [1] P.C.B.

Yamaha DSP-AX620 Specifications

General

Brand	Yamaha
Model	DSP-AX620
Category	Amplifier
Language	English