Yamaha PX10, Руководство по обслуживанию, Страница: 38 / 148

38
PX10/PX8/PX5/PX3
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
speci
fi cations about the normal current.
Advance preparation
1. Connect 8 ohms load resistances for PX ampli fi er output
terminals.
2. Input 1kHz sine wave signal to PX ampli fi er.
3. Adjust ampli fi er outputs to 250W@8 Ω .
〈
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 ampli fi er.
5-4-7. /CLIP-A OFF
This is not tested for service inspection of PX ampli fi er.
5-4-8. /CLIP-B ON
This is not tested for service inspection of PX ampli fi er.
5-4-9. /CLIP-B OFF
This is not tested for service inspection of PX ampli fi 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 ampli fi er output
terminals.
2. Input 1kHz sine wave signal to PX ampli fi er.
3. Adjust ampli fi er outputs to 250W@8 Ω .
〈
Service inspection screen
〉
Left end
✽
is a selecting cursor.
The fault location at the time of FAIL
VSENSEA, VSENSEB, ISENSEA, ISENSEB