E-E Maximum Input Check - Sony DSR-25 Service Manual

DSR-25
(3) +4dB Check
Mode
Signal
Measurement Point
Measuring instrument
Specified Value
Note 1: 0 dBV = 1 Vrms
Note 2: 0 dBs = 0.775 Vrms
Switch setting
INPUT LEVEL select switch .......................... –10
Menu setting (AUDIO SET menu)
AUDIO MODE ................................................ FS32K
Checking method:
1) Enter 1 kHz, +8 dBs signal to the AUDIO INPUT terminal
(CH-1, 2).
2) Check that the output of AUDIO OUTPUT terminal (CH-1, 2)
satisfies the specified value.
3) Check that the audio level indication on the LCD monitor shows
"–22", "–20" or "–18".
STOP
Audio: 1 kHz, +8 dBs signal
AUDIO INPUT terminal
(CH-1, 2)
AUDIO OUTPUT terminal
(CH-1, 2)
Audio level meter
AUDIO OUTPUT terminal
CH1: –12 to –8 dBV
CH2: –12 to –8 dBV
LCD monitor display
"–22" or "–20" or "–18"

3. E-E Maximum Input Check

(1) –10dB Check
Mode
Signal
Measurement Point
Measuring instrument
Specified Value
Note: 0 dBs = 0.775 Vrms
Switch setting
INPUT LEVEL select switch .......................... –10
AUDIO INPUT mode select switch ................ VAR
Menu setting (AUDIO SET menu)
AUDIO MODE ................................................ FS32K
Checking method:
1) Enter 1 kHz, +18 dBs signal to the AUDIO INPUT terminal
(CH-1).
2) Measure the output waveform at the AUDIO OUTPUT termi-
nal (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
Signal
Measurement Point
Measuring instrument
Specified Value
Note: 0 dBs = 0.775 Vrms
Switch setting
INPUT LEVEL select switch .......................... –10
AUDIO INPUT mode select switch ................ VAR
Menu setting (AUDIO SET menu)
AUDIO MODE ................................................ FS32K
Checking method:
1) Enter 1 kHz, +30 dBs signal to the AUDIO INPUT terminal
(CH-1).
2) Measure the output waveform at the AUDIO OUTPUT 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 waveform.
4) For the CH-2, make a checking in the same manner.
5-68
STOP
Audio: 1 kHz, +18 dBs signal
AUDIO INPUT terminal
(CH-1, 2)
AUDIO OUTPUT terminal
(CH-1, 2)
Oscilloscope
No clip is found in the output
waveform.
STOP
Audio: 1 kHz, +30 dBs signal
AUDIO INPUT terminal
(CH-1, 2)
AUDIO OUTPUT terminal
(CH-1, 2)
Oscilloscope
No clip is found in the output
waveform.