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37
TEST POINTS
The output signals from the Hi-Fi audio heads and video heads are available at the front panel test points. Connect an oscilloscope to
Tape-to-head contact
these test points to check the VCR's performance and condition.
Connection
Items to be checked
Standard waveform
Tape running stability
Inferior RF after head replacement
e "+" triggered
Hi-Fi audio head output
To input terminal of
:
oscilloscope
RF recording level
A-RF e-
To external trigger terminal
D-PULSE oH
of oscilloscope
Nie
To ground terminal of
oscilloscope
Video head output
V-RF ©—e
input termina! of
oscilloscope
ane)
To external trigger terminal
of oscilloscope
a
nd
terminal of
ono
}—
peciisecoge
Use
a 10:1 probe
CH-1
CH-2
Compatibility of tape pattern
Tape-to-head contact
Tape running stability
Tracking
Video signal recording level
Abnormality in RF
CH2
oe
e "+" triggered
AUTOMATIC EQUALISER
To prevent deterioration of the luminance signal frequency caused by worn heads, or when using tapes with different signal
characteristics or that have been over-played, the BR-S622E incorporates an automatic equaliser (AUTO EQ) circuit which functions
in the S-VHS mode. The reference signal to operate this circuit is added to one H line of the vertical blanking time. Prior to shipment,
the BR-S622E is preset to add the reference signal to line 11. If VITC (Vertical Interval Time Code) or VITS (Vertical Interval Test
Signal) is inserted in this line, these signals will be erased. If you do not want these signals erased, consult a JVC service agent.
NOTE:
The AUTO EQ circuit does not function if the reference signal reading position differs from the position of the reference signal added in
recording. It will also malfunction if VITC or VITS is recorded at the reference signal reading position.
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