Ad Value When The Protection Function Was Activated - Yamaha A-S701 Service Manual

Example:
To check the history for the 3rd most recent protection function, set the "SPEAKERS" knob to "OFF", the "BASS" and "TREBLE"
knobs to their top positions, the "LOUDNESS" knob to "FLAT", and the "BALANCE" knob to "L". (Fig. 8)
1.

AD value when the protection function was activated

At the same time that the protection history is indicated, the AD value when the protection function was activated is
indicated in binary code (BCD) using the "INPUT" indicators. (Fig. 9)
BASS:
AD value for the most recent protection function
TREBLE:
AD value for the 2nd most recent protection function
BALANCE:
AD value for the 3rd most recent protection function
LOUDNESS:
AD value for the 4th most recent protection function
* When checking the AD value when the protection function was activated, the "VOLUME" knob will automatically
move to the position when the protection function was activated. Do not operate any knob while this knob is moving.
* For functions If protection L/Rch or USB over current protection or if there is no protection history, all "INPUT"
indicators will be off since there are no AD values stored.
Indications for AD values of the abnormal voltage detected when a protection function is activated
LINE 3 LINE 2
7 6
2 = 128 2 = 64
0 0
0 1
1 0
1 0
1 1
Fig. 8
Fig. 9
"INPUT" indicators
Binary number (BCD) [Light up: 1, Off: 0]
LINE 1 OPTICAL COAXIAL
5 4 3
2 = 32 2 = 16 2
0 0
0 0
0 0
1 0
1 1
Fig. 10
CD TUNER
2 1
= 8 2 = 4 2 = 2
0 0 0
0 0 0
0 0 0
1 0 0
1 1 1
A-S701
Indication example
AD value
PHONO
0
2 =1 5V=255
0 0 /255
0 64 /255
0 128 /255
0 168 /255
1 255 /255
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