Audio System Adjustments; Playback Level/Indicator Check; E-E Level Check; Recording/Playback Check (Audio Lock Mode) - Sony DSR-20MD Service Manual

3-6. AUDIO SYSTEM ADJUSTMENTS

Unless spesified otherwise, set the switches as follows.
AUDIO NODE (Menu display) ..................................... Fs48k
INPUT SELECT .......................................................... VIDEO
AUDIO MONITOR ..................................................... CH-1/2
REC LEVEL L, R ......................................................... Center
Note 1: Set AUDIO MODE at the SET UP menu of the menu
screen.
Connection of Equipment
Pattern generator
VIDEO OUT
Audio level meter
Audio
or distortion meter
VIDEO INPUT
generator
VTR
600 Ω
47 kΩ
Attenuator
AUDIO INPUT AUDIO OUTPUT
Input to both L and R
channels simultaneously
600 Ω : 270 (1-249-410-11) +330 (1-249-411-11)
47k Ω : 1-249-437-11
Fig. 5-3-33.

1. Playback Level/Indicator Check

Mode Playback
Signal Audio check reference tape
Measurement point Audio output terminal (Left and Right)
Measuring Instrument Audio level meter and frequency counter
32 kHz mode:
1 kHz signal should be output
48 kHz mode:
1 kHz signal level should be
+6 ± 2 dBv (+8.2 ± 2 dBs)
44.1 kHz mode EMP ON:
Specified Value
7.35 kHz signal level is –6 ± 1 dB
for 1 kHz signal level in 48 kHz mode
44.1 kHz mode EMP ON:
7.35 kHz signal level is 0 ± 1 dB
for 1 kHz signal level in 48 kHz mode
NS AUDIO lamp should be lit
Note: 0 dBv = 1 Vrms
0 dBs = 0.775 Vrms
Checking method:
1) Check that the playback signal level satisfies the specified
value.

2. E-E Level Check

Mode E-E (LINE 1 input)
Audio: 1 kHz –6 dBv (–3.8 dBs) Signal
Audio input terminal (Left and Right)
Signal
Video: Color bar signal
Video input terminal
Measurement point Audio output terminal (Left and Right)
Measuring Instrument Audio level meter
Specified Value –6 ± 3 dBv (–3.8 ± 3 dBs)
Checking method:
1) Check that the 1 kHz signal level satisfies the specified value.
2) Check that the number in the segment of the level meter (fluo-
rescent display tube) that is lit is between 8 and 12 for both the
L and R channels.

3. Recording/Playback Check (Audio Lock Mode)

Mode Recording/Playback (LINE input)
Signal Audio: no signal
Video:
Color bar Video input terminal
Measurement point
Display data of page: 5, address: 00
of the adjusting remote commander
Measuring Instrument
1 After playback pause, the changes in the
data after 5 frames have been sent
continuously must be in the following
order.
Specified Value "D4"t"D6" t"D6" t"D6" t"D6"
t"D4" (NTSC)
"D8" t"D8"t "D8"t "D8"t "D8"
t "D8" (PAL)
2 NS AUDIO lamp should be lit.
Note 1: Check that the AUDIO MODE (menu screen) is Fs48k.
Note 2: Send the frames using front panel button.
Checking method:
1) With no audio signal being input, record the color bar signal
for about 1 minute.
2) Playback the recorded part, and set the playback pause mode.
3) Select page: 5, address: 00 using the adjusting remote com-
mander.
4) Send the frames, so that the display data for page: 5, address:
00 is D4. (NTSC)
5) Send 5 frames continuously, and check that the display data of
page: 5, address: 00 changes in the order specified.
6) Exit the playback pause mode, playback the recorded part, and
check that the NS AUDIO lamp (front panel) is off.
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3-7. ARRANGEMENT DIAGRAM FOR ADJUSTMENT PARTS

RP-228 BOARD (SIDE A)
CN101 CN102
30 1 30 1
RP-228 BOARD (SIDE B)
CL812
CL813
CL815
CL816
POWER BLOCK (U-2)
CN12
11 1
2 20
CN775
1 19
CN771
10 9
2
1
CN11
CN10
1 8 1
9
5-88