Audio Level Indication Check; Recording And Playing Check - Sony DSR-50P Service Manual

3. Audio Level Indication Check

Mode STOP
Signal Audio: 1 kHz, 0 dBu signal
AUDIO INPUT terminal
(CH-1 to 4)
Measurement point Audio level indication on the front
panel
Measuring instrument (Indication on LCD monitor and on
display window of the set)
Specified value LCD monitor:
All level meters light up and a red
LED on the right side of meter lights
up.
Display window of the set:
All level meter light up and the
OVER indicator on the meter lights
up.
Note: 0 dBu = 0.775 Vrms/balance
Switch setting
DISPLAY (LCD OFF/OFF/ON) switch ...... ON
DISPLAY (MENU/TC/AUDIO) switch ...... AUDIO
VIDEO INPUT SELECT switch ................. VIDEO (except DV)
AUDIO INPUT SELECT switch (CH-1 to CH-4) ................. LINE
AUDIO INPUT LEVEL CONTROL switch (CH-1 to CH-4) .... –20
Menu setting (AUDIO SET menu)
AUDIO MODE ...................... FS32K
LIMITER ................................ OFF
Checking method:
1) Enter 1 kHz, 0 dBu signal to the AUDIO INPUT terminal (CH-
1).
2) Set the REC level mode switch (CH-1) on the front panel to
"MANU", and rotate the REC level adjusting knob to the
maximum position (clockwise).
3) At this time, check that the CH-1 level meters on the LCD
monitor all light up, and a red LED on the right side of meter
lights up.
4) Set the METER switch on the front panel to "CH1/2".
5) At this time, check that the CH-1 level meters on the display
window of the set all light up, and the OVER indicator on the
meter lights up.
6) For the CH-2, 3 and 4, perform checking in the same manner.

4. Recording and Playing Check

Mode
Signal
Measurement point
Measuring instrument
Specified value
Switch setting
DISPLAY (LCD OFF/OFF/ON) switch ...... ON
DISPLAY (MENU/TC/AUDIO) switch ...... AUDIO
VIDEO INPUT SELECT switch ................. VIDEO (except DV)
AUDIO INPUT SELECT switch (CH-1 to CH-4) .............. LINE
AUDIO INPUT LEVEL CONTROL switch (CH-1 to CH-4) .... –20
Menu setting (AUDIO SET menu)
AUDIO MODE ...................... FS32K
LIMITER ................................ OFF
Checking method:
1) Enter 1 kHz, 0 dBu signal to the AUDIO INPUT terminal (CH-
1).
2) Set the REC level mode switch (CH-1) on the front panel to
"MANU".
3) Rotate the REC level adjusting knob so that 0 dB on the CH-1
level meter on the LCD monitor lights up and a red LED on
the right side of meter does not light up.
4) At this time, check that the rotating angle of the REC level
adjusting knob is within 1 division from the center.
Note: Hence, do not rotate the REC level adjusting knob unless
otherwise specified, as this set position (rotating angle) of the
REC level adjusting knob is required in other checking items.
5) Perform recording continuously for about 30 seconds, and play
the recorded part.
6) Check that the output level on CH-1 satisfies the specified
value.
7) Observing the output waveform on CH-1 with the oscilloscope,
check that no clip is found.
8) Check that the playback sounds at the changed speed are
outputted, when the recorded part is cued/reversed.
9) For the CH-2, 3 and 4, perform checking in the same manner.
5-92
REC and PLAY
Audio: 1 kHz, 0 dBu signal
AUDIO INPUT terminal
(CH-1 to 4)
Video: Color bar
VIDEO IN terminal
AUDIO OUTPUT terminal (CH-1 to 4)
Audio level meter, Oscilloscope
REC level adjusting knob:
Within 1 division from the center.
Output level: +6 to +10 dBV
Output waveform: No clip
When the recorded part is cued/
reversed, the playback sounds at the
changed speed must be outputted.