JVC SR-VS30U Service Manual page 18

Item Conditions
15 Checking Signal input:
MPX filter LINE IN
effect Input level:
Maximum
16 Checking Operation mode:
peak REC/PAUSE
indicator Input frequency:
calibration 1 kHz
Signal input:
LINE IN
LINE OUT: -4 dBs
(Indicator reads at 0
position)
1-18 (No.MB061)
Adjustment and Confirmation
1. Connect an electronic voltmeter and
oscilloscope to the LINE OUT terminals.
2. Set the INPUT volume to the maximum
position.
Supply 1 kHz and 19 kHz signals reference
level to the LINE IN terminals respectively in
record/pause mode.
While recording monitor the 1 kHz and 19 kHz
signals respectively, confirm that level
difference between 19 kHz signal to 1 kHz
signal is more than 30 dB.
1. Connect an electronic voltmeter to the LINE
OUT terminals.
2. Supply the 1 kHz reference signal (-4 dBs) to
the LINE IN terminals.
3. While rising the input signal level at the LINE
4. OUT so that each peak indicator is turned on
with the output level specified on the light.
Standard value Adjust point
19 kHz level:
-30 dB (including
18.99 to 19.01 kHz)
lower than 1 kHz
signal
Signal level
Indicator
(LINE OUT)
- 30 - 34 dBs 5 dB
- 20 - 24 dBs 4 dB
- 15 - 19 dBs 3 dB
- 12 - 16 dBs 3 dB
- 10 - 14 dBs 2 dB
- 8 - 12 dBs 2 dB
- 6 - 10 dBs 2 dB
- 4 - 8 dBs 1 dB
- 2 - 6 dBs 2 dB
0 - 4 dBs 2 dB
+ 2 - 2 dBs 2 dB
+ 4 0 dBs 2 dB
+ 6 + 2 dBs 2 dB
+ 8 + 4 dBs 2 dB