Yamaha PX10, Service Manual, Page: 37 / 148

37
PX10/PX8/PX5/PX3
5-4. DP200 (IC601)
5-4-1. I2C Bus
Contents Via I2C Bus which is a communication path with a
microcomputer, it inspects automatically using the
register of DP200.
Advance preparation None.
〈
Service inspection screen
〉
Left end
✽
is a selecting cursor.
The fault location at the time of FAIL
I2C Bus (SCL-DP2, SCA-DP2)
5-4-2. OCPA Flag PROTA_N
This is not tested for service inspection of PX ampli fi er.
5-4-3. OCPB Flag PROTB_N
This is not tested for service inspection of PX ampli fi er.
5-4-4. V-SENSE
(
OUTVA,OUTVB
)
Contents When the output voltage of amplifier without load
is normal, it inspects automatically that the value
of the OUTVA or OUTVB register of DP200 is
judgment within the range.
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