Head Phone Check - Sony DSR-25 Service Manual

7. HEAD PHONE Check

Mode STOP
Signal Audio: 1 kHz, –6 dBs signal
Measurement Point HEAD PHONE terminal (L, R)
Measuring instrument Audio level meter
Specified Value –21 to –15 dBV
Note 1: 0 dBs = 0.775 Vrms
Note 2: 0 dBV = 1 Vrms
Switch setting
INPUT LEVEL select switch .......................... –10
Menu setting (AUDIO SET menu)
AUDIO MODE ................................................ FS32K
Checking method:
1) Enter 1 kHz, –6 dBs signal to the AUDIO INPUT terminal
(CH-1).
2) Set the HEADPHONE LEVEL control knob to the maximum.
3) Measure the output of HEADPHONE terminal (L) at this time
to check that it satisfies the specified value.
4) Connect a headphone to the HEADPHONE terminal, and ro-
tate the HEADPHONE LEVEL control knob from maximum
to minimum.
5) Check at this time that the sound on L channel varies smoothly.
6) For the R channel, make a checking in the same manner.
AUDIO INPUT terminal
(CH-1, 2)
5-71
DSR-25