Playing Level Check; E-E Level Check - Sony DSR-25 Service Manual

1. Playing Level Check

Mode PLAY
Signal Alignment tape: For audio check
Measurement Point AUDIO OUTPUT terminal
(CH-1, 2)
Measuring instrument Audio level meter
Oscilloscope
Specified Value 32 kHz mode section:
48 kHz mode section:
44.1 kHz mode EMP ON section:
44.1 kHz mode EMP OFF section:
Note: 0 dBV = 1 Vrms
Checking method:
1) Check that the play signal level satisfies the specified value.
2) Check with the oscilloscope that no clip is found in the output
waveform.
(NTSC: XH5-3/PAL: XH5-3P)
1 kHz signal must be outputted.
1 kHz signal level is +4 to +8
dBV.
7.35 kHz signal level is –2 to +2
dBV.
7.35 kHz signal level is +4 to +8
dBV.

2. E-E Level Check

(1) –10dB 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, –6 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".
(2) –2dB 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, +2 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".
5-67
STOP
Audio: 1 kHz, –6 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"
STOP
Audio: 1 kHz, +2 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"
DSR-25