Yamaha PX10 Service Manual page 38

PX10/PX8/PX5/PX3
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5-4-5. I-SENSE OUTIA,OUTIB
Contents When the output current of amplifier with rated
load is normal, it inspects automatically that the
value of the OUTIA or OUTIB register of DP200 is
judgment within the range. Refer to the following
specifi cations about the normal current.
Advance preparation
1. Connect 8 ohms load resistances for PX amplifi er output
terminals.
2. Input 1kHz sine wave signal to PX amplifi er.
3. Adjust amplifi er outputs to 250W@8Ω.
〈 Service inspection screen 〉
Left end✽is a selecting cursor.
The fault location at the time of FAIL
ISENSEA, ISENSEB
5-4-6. /CLIP-A ON
This is not tested for service inspection of PX amplifi er.
5-4-7. /CLIP-A OFF
This is not tested for service inspection of PX amplifi er.
5-4-8. /CLIP-B ON
This is not tested for service inspection of PX amplifi er.
38
) 5-4-9. /CLIP-B OFF
This is not tested for service inspection of PX amplifi er.
5-4-10. V-SENSE,I-SENSE Calibration
Contents This inspection is divided into every A and B, and is
performed.
When the output voltage of amplifier without load
and the output current of amplifier with rated load
are normal , the calibration of the value of the
OUTVx and OUTIx registers of DP200 are carried
out simultaneously, and each correction value is
calculated automatically. The each correction value
is saved as in the fl ash memory.
(x = A or B)
Advance preparation
1. Connect 8 ohms load resistances for PX amplifi er output
terminals.
2. Input 1kHz sine wave signal to PX amplifi er.
3. Adjust amplifi er outputs to 250W@8Ω.
〈 Service inspection screen 〉
Left end✽is a selecting cursor.
The fault location at the time of FAIL
VSENSEA, VSENSEB, ISENSEA, ISENSEB