Sony Walkman NW-HD1 Service Manual page 11

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.
key to display major item, and press the M m
2. Press the
,
key to select the "AUDIO".
LCD display
AUDIO
key to display minor item, and press the M m
3. Press the
,
key to select the "F 1".
LCD display
F 1
4. Press the key, "START" is displayed and "20 Hz 0 dBs
Bx
L-ch/R-ch" audio signal is outputted.
LCD display
START
5. Press the [SET UP] key, return to minor item selection screen.
6. Press the M m key to select the "F 2".
LCD display
F 2
7. Press the key, "START" is displayed and "20 kHz 0 dBs
Bx
L-ch/R-ch" audio signal is outputted.
LCD display
START
8. Press the [SET UP] key, return to minor item selection screen.
9. Press the M m key to select the "F 3".
LCD display
F 3
10. Press the key, "START" is displayed and "100 Hz 0 dBs
Bx
L-ch/R-ch" audio signal is outputted.
LCD display
START
11. Press the [SET UP] key, return to minor item selection screen.
12. Press the M m key to select the "F 4".
LCD display
F 4
13. Press the key, "START" is displayed and "10 kHz 0 dBs
Bx
L-ch/R-ch" audio signal is outputted.
LCD display
START
14. Press the [SET UP] key, return to minor item selection screen.
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".
LCD display
AUDIO
key to display minor item, and press the M m
3. Press the
,
key to select the "SEP LR".
LCD display
SEP LR
4. Press the key, "START" is displayed and "1 kHz 0 dBs
Bx
L-ch" audio signal is outputted. In this state, Each time [MODE]
key is pressed, V-SUR switch is performed.
LCD display
START
5. Press the [SET UP] key, return to minor item selection screen.
6. Press the M m key to select the "SEP RL".
LCD display
SEP RL
7. Press the key, "START" is displayed and "1 kHz 0 dBs
Bx
R-ch" audio signal is outputted. In this state, Each time [MODE]
key is pressed, V-SUR switch is performed.
LCD display
START
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".
LCD display
AUDIO
key to display minor item, and press the M m
3. Press the
,
key to select the "MAXOUT".
LCD display
MAXOUT
4. Press the key, "START" is displayed and "1 kHz 0 dBs
Bx
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.
LCD display
START
5. Press the [SET UP] key, return to minor item selection screen
NW-HD1
Ver 1.1
11