NW-HD1 - Sony Audio Service Manual (repair manual). Page 11

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11
NW-HD1
5-2-3. Frequency characteristic check
“20 Hz/20 kHz/100 Hz/10 kHz   0 dBs   L-ch/R-ch” audio signal is
outputted.
Checking method:
1. Enter the audio test mode.
2. Press the 
 
 key to display major item, and press the  
M   m
key to select the “AUDIO”.
3. Press the 
 
 key to display minor item, and press the  
M   m
key to select the “F 1”.
4. Press the 
 Bx 
 key, “START” is displayed and “20 Hz   0 dBs
L-ch/R-ch” audio signal is outputted.
5. Press the [SET UP] key, return to minor item selection screen.
6. Press the  
M   m   key to select the “F 2”.
7. Press the 
 Bx 
 key, “START” is displayed and “20 kHz   0 dBs
L-ch/R-ch” audio signal is outputted.
8. Press the [SET UP] key, return to minor item selection screen.
9. Press the  
M   m   key to select the “F 3”.
10. Press the 
 Bx 
 key, “START” is displayed and “100 Hz   0 dBs
L-ch/R-ch” audio signal is outputted.
11. Press the [SET UP] key, return to minor item selection screen.
12. Press the  
M   m   key to select the “F 4”.
13. Press the 
 Bx 
 key, “START” is displayed and “10 kHz   0 dBs
L-ch/R-ch” audio signal is outputted.
14. Press the [SET UP] key, return to minor item selection screen.
    AUDIO
LCD display
    F 1
LCD display
    START
LCD display
    F 2
LCD display
    START
LCD display
    F 3
LCD display
    START
LCD display
    F 4
LCD display
    START
LCD display
5-2-4. Channel separation check
“1 kHz   0 dBs   L-ch/1 kHz   0 dBs   R-ch” audio signal is outputted.
Checking method:
1. Enter the audio test mode.
2. Press the 
 
 key to display major item, and press the  
M   m
key to select the “AUDIO”.
3. Press the 
 
 key to display minor item, and press the  
M   m
key to select the “SEP LR”.
4. Press the 
 Bx 
 key, “START” is displayed and “1 kHz   0 dBs
L-ch” audio signal is outputted. In this state, Each time [MODE]
key is pressed, V-SUR switch is performed.
5. Press the [SET UP] key, return to minor item selection screen.
6. Press the  
M   m   key to select the “SEP RL”.
7. Press the 
 Bx 
 key, “START” is displayed and “1 kHz   0 dBs
R-ch” audio signal is outputted. In this state, Each time [MODE]
key is pressed, V-SUR switch is performed.
8. Press the [SET UP] key, return to minor item selection screen.
5-2-5. Maximum output check
“1 kHz   0 dBs   L-ch/R-ch   VOLUME: 30” audio signal is outputted.
Checking method:
1. Enter the audio test mode.
2. Press the 
 
 key to display major item, and press the  
M   m
key to select the “AUDIO”.
3. Press the 
 
 key to display minor item, and press the  
M   m
key to select the “MAXOUT”.
4. Press the 
 Bx 
 key, “START” is displayed and “1 kHz   0 dBs
L-ch/R-ch   VOLUME: 30”  audio signal is outputted. In this
state, Each time [MODE] key is pressed, AVLS ON/OFF switch
is performed.
5. Press the [SET UP] key, return to minor item selection screen
    AUDIO
LCD display
    SEP LR
LCD display
    START
LCD display
    SEP RL
LCD display
    START
LCD display
    AUDIO
LCD display
    MAXOUT
LCD display
    START
LCD display
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