7-16
SRW-5000/5500
A
B
C
D
E
1
2
3
4
TP102
TP401
TP400
E400
TP301
TP200
TP201
E100
LV200
TP100
TP101
TC-104 Board (Side A)
4. LTC Erase Ratio Check
Measuring equipment: Audio signal generator
Audio analyzer
Band-pass filter (1 kHz)
Recording tape:
BCT-SR series
n
For this recording tape, prepare a blank tape erased using
the tape eraser, etc. in advence.
1.
Set the TC menu as follows:
[F6]
(REGENE SOURCE): ext-L
[F7]
(TCG MODE):
prst
2.
Feed the audio signal (1 kHz,
+
7 dBu) from the audio
signal generator to TIME CODE IN connector.
(0 dBu
=
0.775 V rms)
3.
Insert the recording tape, then record for 30 seconds.
(Record the audio signal to the time code track.)
4.
Disconnect the audio signal generator from TIME
CODE IN connector.
5.
Rewind the recorded portion by 15 seconds and insert
the no signal to the time code track by 15 seconds.
6.
Connect the audio analyzer through a 1 kHz band-pass
filter to TP102/TC-104(A-4).
GND: E100/TC-104(A-2)
7.
Play back the audio-signal-recorded portion in PLAY
mode. And then measure the PB level on the audio
analyzer.
Use this measurement value as the reference level (0
dB).
8.
Check the PB level on the audio analyzer while playing
back the no-signal-recorded portion in PLAY mode.
Specification:
_
40 dB or less
(Regard a level of the audio-signal-
recorded portion as 0 dB.)
CH-1
A
A
CH-1
3. LTC OA Check
Measuring equipment: Oscilloscope
Time code generator and reader
Recording tape:
BCT-SR series
n
For this recording tape, prepare a blank tape erased using
the tape eraser, etc. in advence.
1.
Connect the output of the time code generator to TIME
CODE IN connector.
2.
Connect and set the oscilloscope as follows:
CH-1: TP100/TC-104(A-1), DC 100 mV/DIV
GND: E100/TC-104(A-2)
TIME: 100
u
s/DIV
3.
Insert the recording tape.
4.
Check the level on the oscilloscope in REC mode.
Specification: A = 80
±
10 mV p-p
5.
Connect the LTC input of the time code reader to
TIME CODE OUT connector.
6.
Change the connection of oscilloscope as follows:
CH-1: TP102/TC-104(A-4)
GND: E100/TC-104(A-2)
7.
Play back the recorded portion at step 4 in PLAY
mode. And then check that the time code can be read
on the time code reader.
8.
Check each level on the oscilloscope while playing
back the recorded portion at step 4 in PLAY mode.
Specification: A
>
250 mV p-p
Oscilloscope
Oscilloscope
