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AUDIO CIRCUIT
CHECKING
OF E-E LEVEL -
| AC milli-voltmeter
Measuring
-instrument.
'E-E/Record
1kHz, -8.0dBs (at RCA type jack)
1kHz,-3.80Bs (at 21pin type jack)
Input signal
AUDIO OUT jack
—8.0 + 2dBs (at RCA type jack)
- | +3.8 + 2dBs (at 21pin type jack)
1. Connect an oscilloscope to the AUDIO OUT jack.
2. Feed the audio signal shown in table to the AUDIO IN
jack.
.
.
3. Put the unit
in E-E or recording mode.
|
4. Make sure that the output level is value shown in
CHECKING OF AUDIO PLAYBACK LEVEL
AC milli-voltmeter
Playback
Alignmenttape.(VROCPSV) (1kHz
level conrtol signal.)
AUDIO OUT jack
+2dBs
—9 "jan, (at RCA type jack)
Measuring
instrument
Input signal
Test point
Specification
+20Bs
Specification
—7.8 ~saps (at 21 pin type jack)
1. Playback the Alignment tape. (VROCPSV 1kHz level
audio signal)
2. Connect an AC milli-voltmeter to the AUDIO OUT
jack.
3. Make sure that the output level is value shown in
table.
CHECKING OF AUDIO RECORD LEVEL
AC milli-voltmeter
Record/playback
1kHz, -8.0dBs (at RCA type jack)
1kHz, -3.8dBs (at 21pin type jack)
AUDIO OUT jack
—8.0 + 3dBs (at RCA type jack)
—3.8 + 38dBs (at 21pin type jack)
Measuring
instrument
Input signal
Test point
Specification
36
1. Connect:an AC milli-voltmeter to the: AUDIO, OUT
jack. -
:
2. Feed the audio signal shown in table to the AUDIO'IN
'jack.
|
"e
3. Make the self-recording and playback of the signal.
table.
CHECKING OF ERASE VOLTAGE AND OS-
CILLATION FREQUENCY
|
' Measuring
instrument
Mode
Oscilloscope
Record
|
Full erase hea
Test point
Control
Specification
70 + 5kHz, 40Vp-p or greater
1. Put the unit in recording mode. -
a
2. Connect an oscilloscope across the full erase head.
3. Make sure the erase voltage across the full erase
head is approx. 40Vp-p or more and frequency is 70
+ 5kHz.
RF CIRCUIT
ADJUSTMENT OF RF AGC CIRCUIT
DC voltmeter and VHF signal
. generator
RF signal at E12-CH (by VHF sig-
nal generator)
(EBU colour bar signal at 87.5%
modulated.)
Measuring
instrument
Mode
Test point
TP1552 (Sig.}
TP1554 (GND)
VROO1 AGC control
2.55+0.1V
1. Receive the E12 channel signal(colour bar signal at
87.5% modulated.) at Input field strength: 70dBuV
of antenna terminal.
2. Connect a DC voltmeter to test points shown in table.
3. Adjust VROO1 (AGC control) inthe IF pack so that the
voltage be specified.
Control
Specification
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