Sony Handycam DCR-PC10, Service Manual

Page: 135 / 181

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3-7-2. Playback Level Check
Purpose: Check the playback level at each fs of 32kHz,
48kHz and 44.1kHz. Check also the de-
emphasis characteristics at 44.1kHz.
Mode VTR PB
Signal Audio check reference tape
(XH5-3 : NTSC, XH5-3P : PAL)
Measurement Point Right and left channels of AUDIO
VIDEO OUT/HEADPHONES jack
Measuring Instrument Audio level meter and frequency
counter
Specification Value 32kHz mode segment :
1 kHz 3.0 ± 3.0 dBs
48 kHz mode segment :
1 kHz 3.0 ± 3.0 dBs
44.1 kHz mode segment :
The 7.35 kHz signal level at EMP ON
is lower than that at EMP OFF by –6
± 2 dBs.
Check procedure:
Order Procedure
1 Confirm that the playback signal level satisfies the
specification value.
Switch settings:
Headphone volume button (ME-4850 switch block) .......................
9th position decreased from MAX (8th position increased from MIN)
(Check on the EVF or LCD).
3-7-3. EXT MIC Input Gain and L/R Balance Check
Mode Camera mode record
Signal 1 kHz – 44 dBs signal : MIC (I/O
board-1 jig) jack left and right
channels
Measurement Point AUDIO VIDEO OUT/
HEADPHONES jack, left and right
channels
Measuring Instrument Audio level meter
Specification Value Output level of L and R channels =
–7.5 ± 3 dBs
Level difference between L and R
channels = 2 dBs or less
Note 1: Set SW1 on I/O board-1 jig to MIC.
Note 2: Impose a 47 k
Ω
resistance to the left AUDIO VIDEO
OUT/HEADPHONES jack, and turn the power ON from
OFF.
Check procedure:
Order Procedure
1 Input the 1 kHz – 44 dBs signal to the MIC (I/O
board-1 jig) jack left and right channels.
2 Confirm that the signal levels and level difference
between the L and R channels satisfies the
specification value.
3-7-4. EXT MIC Input Separation Check
Mode Camera mode record
Signal 1kHz – 44 dBs signal : MIC (I/O
board-1 jig) jack right channel only.
(Connect the left channel of the MIC
(I/O board-1 jig) with GND).
Measurement Point AUDIO VIDEO OUT/
HEADPHONES jack, right channel
Measuring Instrument Audio level meter
Specification Value – 40 dBs or less (IHF-A filter on, 20
kHz low-pass filter on)
Note 1:
Set SW1 on I/O board-1 jig to MIC.
Note 2:
Impose a 47 k
Ω
resistance to the left AUDIO VIDEO
OUT/HEADPHONES jack, and turn the power ON from
OFF.
Check procedure:
Order Procedure
1 Connect 1kHz, – 44 dBs signal to the right channel
only of the MIC (I/O board-1 jig). (Connect the left
channel of the MIC (I/O board-1 jig) with GND.)
2 Confirm that the signal level of the left channel of
the AUDIO VIDEO OUT/HEADPHONES jack
satisfies the specification value.
3-7-5. EXT MIC Input Distortion Factor Check
Mode Camera mode record
Signal 1kHz – 44 dBs signal : MIC (I/O
board-1 jig) jack left and right
channels
Measurement Point AUDIO VIDEO OUT/
HEADPHONES jack, left and right
channels
Measuring Instrument Distortion level meter
Specification Value 0.4 % or less (20 kHz LPF on)
Note 1: Set SW1 on I/O board-1 jig to MIC.
Note 2:
Impose a 47 k
Ω
resistance to the left AUDIO VIDEO
OUT/HEADPHONES jack, and turn the power ON from
OFF.
Check procedure:
Order Procedure
1 Input the 1kHz – 44 dBs signal to the MIC (I/O board-
1 jig).
2 Confirm that the distortion factor satisfies the
specification value.