6-63
HVR-M25J/M25U/M25N/M25E/M25P/M25C
7.
HEAD PHONE Check
Mode
E-E
Signal
Audio: 1 kHz, –6 dBs signal
AUDIO IN terminal (CH-1, 2)
Measurement Point
PHONES terminal (L, R)
Measuring instrument
Audio level meter
Oscilloscope
Specified Value
–14 to –10 dBs
Note:
0 dBs = 0.775 Vrms
Switch setting
1) AUDIO MODE (AUDIO SET menu) ......................... FS32K
2) AUDIO INPUT LEVEL switch ....................................... –10
3) AUDIO REC LEVEL control knob
............ The position at –10 dB Check of E-E Level Check
Checking method:
1) Enter 1 kHz, –6 dBs signal to the AUDIO IN terminal (CH-1).
2) Set the PHONE LEVEL control knob to the maximum.
3) Measure the output of PHONES terminal (L) at this time to
check that it satisfies the specified value.
4) Check with the oscilloscope that no clip is found in the output
waveform.
5) Connect a headphone to the PHONES terminal, and rotate the
PHONE LEVEL control knob from maximum to minimum.
6) Check at this time that the sound on L channel varies smoothly.
7) For the R channel, make a checking in the same manner.
8.
E-E Maximum Input Check
(1) –10dB Check
Mode
E-E
Signal
Audio: 1 kHz, +18 dBs signal
AUDIO IN terminal (CH-1, 2)
Measurement Point
AUDIO OUT terminal (CH-1, 2)
Measuring instrument
Oscilloscope
Specified Value
No clip is found in the output waveform.
Note:
0 dBs = 0.775 Vrms
Switch setting
1) AUDIO MODE (AUDIO SET menu) ......................... FS32K
2) AUDIO INPUT LEVEL switch ....................................... –10
Checking method:
1) Enter 1 kHz, +18 dBs signal to the AUDIO IN terminal (CH-
1).
2) Using an oscilloscope, measure the output waveform at the
AUDIO OUT terminal (CH-1), when the AUDIO REC LEVEL
control knob on the front panel is rotated toward rather throttle
side.
3) Check at this time that no clip is found in the output wave-
form.
4) For the CH-2, make a checking in the same manner.
(2) +4dB Check
Mode
E-E
Signal
Audio: 1 kHz, +30 dBs signal
AUDIO IN terminal (CH-1, 2)
Measurement Point
AUDIO OUT terminal (CH-1, 2)
Measuring instrument
Oscilloscope
Specified Value
No clip is found in the output waveform.
Note:
0 dBs = 0.775 Vrms
Switch setting
1) AUDIO MODE (AUDIO SET menu) ......................... FS32K
2) AUDIO INPUT LEVEL switch ......................................... +4
Checking method:
1) Enter 1 kHz, +30 dBs signal to the AUDIO IN terminal (CH-
1).
2) Using an oscilloscope, measure the output waveform at the
AUDIO OUT terminal (CH-1), when the AUDIO REC LEVEL
control knob on the front panel is rotated toward rather throttle
side.
3) Check at this time that no clip is found in the output wave-
form.
4) For the CH-2, make a checking in the same manner.
