Self-Diagnostic Function - Yamaha A-S701 Service Manual

■ SELF-DIAGNOSTIC FUNCTION

This unit has self-diagnostic functions that provides the following functions.
• Indication of firmware version
• Indication of "AUTO POWER STANDBY" switch status
• Indication and checking of protection information
• Factory preset
● Starting Self-Diagnostic Function
1. Press the "z" (power) switch to turn off this unit. (Fig. 1)
2. Connect the power cable of this unit to the AC outlet. (Fig. 1)
3. Set the "SPEAKERS" knob to the "OFF" position. (Fig. 1)
Note: Since factory preset is reserved by turning off this unit when the "SPEAKERS" knob is set to the "A" position, set
the "SPEAKERS" knob to the "OFF" position before starting the self-diagnostic function mode.
Set the "BASS", "TREBLE" and "BALANCE" knobs to the top positions. (Fig. 1)
4.
Note: Be sure to set the "BASS", "TREBLE" and "BALANCE" knobs to the top positions. These positions are stored when the
self-diagnostic function mode is started, and software corrections are made to the top position for each selector.
In addition, the self diagnostic function mode cannot be started if the top positions for the knobs are off by more than
± 5% of the 2.5 V input voltage.
Set the "LOUDNESS" knob to the "FLAT" position. (Fig. 1)
5.
Press the "z" (power) key to turn on this unit. (Fig. 1)
6.
Press the "z" (AMP) key on the remote control to set this unit to standby. (Fig. 2)
7.
Repeat pressing the "PURE DIRECT" key 6 times within 15 seconds. (Fig. 1)
8.
Press the "z" (AMP) key on the remote control to turn on this unit. (Fig. 2)
9.
This unit starts the self-diagnostic function mode.
"BASS" , "TREBLE" , "BALANCE" knobs
Power cable
AC outlet
" " (Power) switch
Keys of this unit
"LOUDNESS" knob
"SPEAKERS" knob
Fig. 1
Key on Remote control
"PURE DIRECT" key
A-S701
" " (AMP) key
Fig. 2
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