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AUDIO CIRCUIT ADJUSTMENT.
CHECKING
OF E-E LEVEL
AC milli-voltmeter
Measuring
instrument
E-E or REC mode
Mode
1kHz, —3.8dBs (at 21pin jack)
input signal
AUDIO OUT jack
Test point
—3.8 ± 3dBs (at 21pin jack)
Specification
1. Feed the audio signal shown in table to the left
channel of the AUDIO IN jack.
2. Connect anAC milli-voltmeterto the left channel of the
AUDIOOUTjackandrightchannel o ftheAUDIOOUT
jack.
3. Makesurethatthe milli-voltmeter readsspecialvalue.
CHECKING OF LINEAR AUDIO PLAYBACK
LEVEL
AC milli-voltmeter
Measuring
instrument
Playback
Mode
Alignment tape.(VROCPSV)
Cassette
AUDIO OUT jack
Test point
7.8+42% (at21pin jack)
Specification
1. Connect an AC milli-voltmeter to the AUDIO OUT
jack.
2. Playback theAlignment t ape(VROCPSV)
3. Make sure that the audio output level is as specified.
CHECKING
OF ERASE
OSCILLATION
FREQUENCY
Oscilloscope
Measuring
instrument
Record
Mode
Full erase
Test point
T651
Control
70 ± 5kHz, 40Vp-p or greater
Specification
1. Put the unit in record
2. Connect an oscilloscope across thefull 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
ADJUSTMENT
OF RF AGC CIRCUIT
DC voltmeter and VHF signal
Measuring
instrument
generator
RF signal at El 2-CH (by VHF sig-
Mode
nal generator)
(EBU colour bar signal at 87.5%
modulated.)
TP1552 (Sic.)
Test point
TP1554 (GND)
VRIOI
Control
5.3 ± o.2V
Specification
Receive the E12 channel signal(colour bar signal at
I
87.5% modulated.) at Input field strength: 56dBgV
of antenna
terminal.
Connect a DC voltmeter to test points shown in table.
2.
3. AdjustVRIOI (AGCcontrol)in the IFpack so thatthe
voltage be specified.
13
vc-M29GWM49GM
VC-M26SM/M46SM
VC-M261SM/M461SM
VOLTAGE
AND
head
mode.
AGC
control
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