Panasonic AG-7500 User manual

erating
ructions
asa VHS fa A
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625
Video Cassette Recorder
| -A
Model! acl LULU:
Panasonic
Before
attempting
to
connect,
operate
or
adjust
this
product,
please
read
these
instructions
completely.
VQT2882-1

FOR YOUR SAFETY >
CAUTION:
TO PREVENT FIRE OR SHOCK HAZARD AND
IMPORTANT
“Unauthorized recording of copyrighted television
programmes, films, video tapes and other materials
may infringe the right of copyright owners and be
contrary to copyright laws.”
ANNOYING INTERFERENCE, USE THE RECOM-
MENDED ACCESSORIES ONLY.
Be
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:
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ae
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ae
*
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4
Se ree
@ THIS APPARATUS MUST BE EARTHED.
To ensure safe operation the three-core lead supplied
(not for U.K. model) must be connected only into a
standard three-pin power point which is effectively
earthed through the normal household wiring.
Extension cords used with the equipment must be three-
core and be correctly wired to provide connection to
earth. Wrongly wired extension cords are a major cause
of fatalities.
Before connecting to the power supply, ensure that the
your local power supply.
The voltage selector can be adjusted, if necessary, by using
a screwdriver, but this adjustment must be made after
disconnecting the power cord.
m AC POWER CORD CONNECTION (AG-7500-B only)
The wires in the mains lead for this apparatus are
selector on the rear panel is selected to the same voltage as |:
‘
The fact that the equipment operates satisfactorily does
not imply that the power point is earthed and that the
coloured in accordance with the following code.
Important
installation is completely safe. For your safety, if in any
doubt about the effective earthing of the power point,
consult a qualified electrician.
EARTH
NEUTRAL
Mm DO NOT REMOVE PANEL COVER BY
UNSCREWING.
To prevent electric shock, do not remove cover. No user
serviceable parts inside. Refer servicing to qualified
service personnel.
Mains Lead
@
VOLTAGE
SELECTOR
SETTING
as
follows:
The power cord must be
disconnected from mains
before the voltage selector
setting is changed.
AG-7500 can be used on
either 110, 120, 220, or 240V
AC.
AG-7500-E is preset to 220V
at the factory. AG-7500-A
and -B are preset to 240V at
the factory.
marked by the letter E or by the safety earth symbol
coloured GREEN or GREEN-AND-YELLOW.
The wire which is coloured BLUE must be connected to
the terminal which is marked with the letter N or
coloured black.
The wire which is coloured BROWN must be connected
coloured red.
Remark:
This apparatus was produced to BS 800: 1983.
Dieses Modell entspricht der EG-Vorschrift (fur Funkst6rungsschutz) 82/499/EG.
La Société PANASONIC-FRANCE, importateur du matériel MATSUSHITA-JAPON déclare que cet appareil est conforme aux
prescriptions de la directive 76/889/C.E.E. modifiée par la directive 82/499/C.E.E.
Dit model is onderworpen aan de EEG-richtijn (ter voorkoming van radio-interferentie) 82/499/EEG.
Denne model opfylder EF direktiv 82/499/EF (for forebyggelse af radiointeferens).
La Societa PANASONIC ITALIA S.p.A., importatrice di questo prodotto, dichiara che questo apparecchio @ conforme alle
disposizioni della direttiva C.E.E./82/499 (D.M. 10 aprila 1984).
WARNING: TO PREVENT FIRE OR SHOCK HAZARD
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
& is the safety information.
As the colours of the wires in the mains lead of this x
apparatus may not correspond with the coloured |*
markings identifying the terminals in your plug proceed |:
The wire which is coloured GREEN-AND-YELLOW o
must be connected to the terminal in the plug which is |%
or |
to the terminal which is marked with the letter L or |4

TABLE OF CONTENTS
|
Outline: 4.055 ate eet terete 3
Features. <25.. casio avacens (iad iaacaiee tweak plore 4
Features (Continued) .......................008 5
Controls and their Functions ................... 8
Basic
Operation
of
AG-7500................
14
Adjustment before Recording,
Playback and Editing .................. 16
Recording/Playback Using a
Video CAMCla tuo nsdn seca rdews 21
Editing
Using
the
AG-7500...............
22
Editing
Operation
(Assemble)
.................
23
Editing
Operation
(Insert)...................56
25
Editing
Operation
(Continued)
................
27
Connecting the Unit to a
Time
Base
Corrector..................0065
29
Connecting
the
Unit
to
a
Time Code Generator and Reader ...... 30
Connecting the Cables......................65. 30
Connecting
the
Cables
(Continued)..........
31
Using
Remote
Search
Controller
(Option)...
32
Editing
Using
Editing
Controller
(Option)
...33
Precaution
for
Handling
Unit..................
34
Conditions
Which
Are
Apt
to
Be
Mistaken
for
a
Malfunction
......................
0s
35
Video
Head
Clogging
....................ee
eee
85
Auto
OFF
LAMP
s.cn22e
ccc
oshtodeeaidiesveces
36
A
Word
about
the
Cassette
....................
36
Rack
Mount
Adaptor
(Option)..............
of
SPSCiCAtIONS
esis
aiaidxinsaasrdecenreeeviales
38
INSPECTION
>
Standard Accessory
®
S-VIDEO
Cable
(4P)
(VJA0510)
Optional Accessories
®
S-VIDEO
Cable
(4P)
(AG-C71A...5m)
(AG-C70A.
..3m)
®
Dubbing
Cable
(7P)
(AG-C65)
®
Editing
Controller
(AG-A750/AG-A650/NV-A500/
NV-A960)
®
Remote
Search
Controller
(NV-A505)
©
Remote
Controller
(AG-A600)
®
Rack
Mount
Adaptor
(AG-M750)
OUTLINE
The model AG-7500 Editing Video Cassette Recorder has
been developed for industrial applications, as well as for
schools and studios.
By the use of the S-VHS system, a sharp picture with high
resolution is obtained. Advanced editing and easy operation is
realized by the introduction of high reliability mechanisms
including the two-reel motor drive system, DD cylinder, and DD
capstan.
By connecting the AG-A750 Editing Controller to the AG-7500,
you can fully utilize the editing functions of the AG-7500 and
perform more accurate editing by automatic operation. You
can also create an editing system by connecting the unit to the
AG-A650, NV-A500 or NV-A960 Editing Controller.

FEATURES >
1. Amorphous heads and high quality picture
Picture quality has been improved by the use of the S-VHS
system and the amorphous heads. Resolution of over 400
lines and less noise are realized in the following
conditions.
eFM
carrier
frequency:
White
peak;
7
MHz
Sync tip; 5.4 MHz
einstallation
of
sub-emphasis
circuit
eWhite clip level: 210 %
eUse of S-VHS tape
2. Use of digital YC separator circuit
ePerfect YC separation is possible even in noncorrelating
portions.
Because of burst PLL system, non-standard signals can
be separated, too.
®As
digital
signals
are
process,
YC
can
be
separated
with
small
temperature
or
characteric
changes
by
a
stable
operation.
3. Time Code Editing
The unit allows the execution of time code editing when
this
unit
is
connected
to
the
AG-A750
Editing
Controller.
Synchronization is also possible at the Edit IN point by the
Capstan Override Connector.
4. High precision linear audio editing timing
When
insert
or
assemble
editing,
itis
possible
to
edit
at
the
linear
audio
editing
timing
of
+1
frame
with
respect
to
the
video
recording
timing.
(When
using
AG-A750.)
5. Automatic back space function
By the automatic back space function, video and audio
data without blank portions can be recorded by splicing.
6. H-aligned framing servo
Sometimes, when editing video signals conforming to the
CCIR
standard,
frame
phase
misalignment
or
horizontal distortion occurs between adjacent edited
portions. This unit employs a framing servo to align the
frames, thus eliminating such errors at the edit start and
end points.
7. Flying erase-based editing
The adoption of a “rotary erase head” makes it possible to
achieve top-grade electronic editing without noise or
frame mis-synchronization.
8. Dual audio channel-Dolby* NR system
Because there are two normal audio tracks, stereo or
bilingual programmes can be recorded and played back.
The sound quality is further improved due to the built-in
Dolby NR system.
* ‘Dolby’ and the double-D symbol are trademarks of Dolby Laboratories
Licensing Corporation.
* Noise reduction manufactured under license from Dolby Laboratories
Licensing Corporation.
9. Recording and playback of Hi-Fi sound
(HD sound) and assemble editing
You can record and play back HD Sound even without a
video input signal. You can also independently record a
total of four channels, that is, HD Sound (CH1/CH2) and
Normal Audio CH1/CH2.
10. JOG/SHUTTLE search function using dial
A programme segment on the tape can be rapidly and
accurately found by using the SHUTTLE search in which
the tape speed is varied between 0 and 10 times the normal
speed, or the JOG search in which the tape speed is varied
in accordance with the rotational speed of the dial.
11. Field still function
This function provides attractive still pictures with minimal
jitter.
12. Rack mounting possible due to front
loading
The unit is a cassette tape insertion type employing front
loading, hence it can be easily installed in an IEC standard
19-inch rack.
13. Editing and dubbing connectors
Special connectors designed for dubbing provide
improved picture quality when dubbing or editing
between video recorders.
14. Time code recording and playback
The EBU time code can be recorded and played back on
the audio CH2 track.
15. Independent editing
When the AG-7500 is used independently as an editor
and the edit start and end points are memorized in the tape
counter, editing automatically takes place between those
points.
16. System editing
An editing system can be configured by connecting the
AG-7500 to an Editing Controller.
eUp to three source (playback) units can be connected
simultaneously by using a Remote Search Controller
(NV-A505, option).
eit is possible to configure a system by connecting the
unit to the AG-A750, AG-A650, NV-A500 or NV-A960
Editing Controller (options).

FEATURES
(CONTINUED)
.
|
The S-VHS System has been designed to meet the critical demands of the Video
a= Vi S Information Age. This system incorporates technologies that provide high resolution and
= excellent picture quality with the VHS Video system, which is solidly established the
world over for industrial and home use.
The combination of this system with the newly developed S-VHS video cassette has
enabled epoch-making progress in picture clarity and detail. The system produces a
horizontal resolution of no less than 400 lines.
You can not only make recordings and playbacks of high quality pictures by using a
video cassette with the rl el but also enjoy recording and playback as before
with a cassette bearing the IS) mark.
Interchangeability of Video Recorders and Cassettes
During recording
S-VHS tape sas on this unit Recorded tape
posi 2 nn
iF
o
=
2
t
é 2/38 a le =O
Select the S-VHS selector
for either ON (S-VHS [erste \
mode) or OFF (VHS Saas
mode).
Recorded on this unit
Conventional VHS
Tape for recording Recorded tape
system
a
The recording is made by
VHS system regardless of
the position of the switch.
During playback
Recorded tape cesuctt .
ea) fe ® Plays back by automatically recog-
S-VHS CEE CSRS nizing the system recorded in the
se)" EEE tape.
ey
Recorded tape video recorder
VHS
©
Playback
picture
of
tapes
record-
ed by S-VHS system cannot be
[es 5 seen:
[9° Oss etwas

Comparison between S-VHS and VHS
As compared with the conventional VHS system, the
performance is remarkably improved as follows.
@ Frequency shift: 3.8 MHz ~ 4.8 MHz to 5.4 MHz
~7 MHz
@ FMluminance bandwidth: Approx. 3.2 MHz to approx. 5.5
MHz
e Resolution: Approx. 240 lines to more than
400 lines
However, when the band is widened, the S/N becomes inferior
accordingly. To prevent this deterioration, in the S-VHS
system, the following measures are incorporated.
e@ The sub-emphasis circuit is introduced in the preliminary
stage of the conventional main emphasis circuit.
@ AnS-VHS tape made of newly developed magnetic material
is used exclusively for the S-VHS.
@ The use of the amorphous heads ensures high quality
pictures.
©@ VHS System
Colour
signal
© S-VHS System
Colour
signal
'
i1 2
I;
|
|
627kH2z
3
Approx.
S.SMHz
———1 Frequency
Resolution more
than approx. 400 lines
High Quality Picture
Incorporation of detail enhancer
During VHS mode a picture with fine details, such as ripples on
the surface of water ora womans long flowing hair, tends to be
reproduced flat. The detail enhancer circuit enhances the
high-frequency signals (more than 1.5 MHz) of such pictures
before they are recorded, thus enabling every detail to be
reproduced clearly (4 dB up).
HD (high-dynamic) System
This unit records audio using the following two formats:
@ Hi-Fi sound: An FM format employing a dedicated
rotary audio head permits high quality
sound recording and reproduction.
This is the same format as that used ina
conventional video recorder.
® Normal audio:
<Compatibility with conventional recording methods>
This unit can record tapes in the conventional (normal) mode,
enabling tapes recorded on it to be reproduced on a
conventional machine.
The unit can also reproduce tapes recorded on a conventional
machine.
@ Independent dedicated audio head installed
on rotary cylinder
The audio of a video tape which was formerly recorded
using a fixed head is recorded on this unit using an audio
head mounted on a rotary cylinder. The video is recorded
over the audio using a dedicated video head. This
completely new format (Figs. 1 and 2) is called a high-
dynamic system (for creating superior sound quality).
Search head (R”)
Rotary erase head
Video recording/
playback head (L)
(Amorphous head)
Dedicated rotary
audio head (R)
Rotary erase head
Dedicated rotary
audio head (L)
Video recording/-
playback head (R)
(Amorphous head)
Search head (R’)
<Rear view>

@
Use
of
newly
developed
audio
processing
IC
A
newly
developed
Hi-Fi
sound
IC
processes
the
audio
input
signals
at
the
optimum
level
without
deterioration.
As
a
result,
the
dynamic
range
has
been
increased
from
the
conventional
value
of
80
dB
to
90
dB,
making
for
impressive
dynamic
sound.
©
Deep
layer
audio
recording
which
does
not
interfere with the video signal
The
dedicated
audio
heads
record
a
wide
frequency
band
FM
signal
on
a
deep
layer
of
the
tape.
The
video
signal
is
recorded
over
the
audio
signal
using
a
completely
different
azimuth
angle
for
the
video
head.
As
a
result,
even
though
the
recording
position
is
the
same,
the
audio
and
video
signals
are
recorded
clearly
and
without
mutual
interference.
(Figs.
2
and
3)
©
Deep
layer
recording
as
seen
on
the
cross-section
of
the
tape
Dedicated
—— audio head
Dedicated video
recording head
Base film
Audio signal
(recorded on deep layer of tape)
Video signal
(recorded
on
surface
layer
of
tape)
©
Track
pattern
of
deep-layer
recording
(outline)
Normal audio track
CH2
ae — CH1
MMMM
VICHUASUUUUIGUGAUEONLUTGSERHAEUHUDOUUUUUTUUEUUUO
eve
UU
Video track
+
Hi-Fi sound
track
@
Incorporation
of
switching
noise
reduction
circuit
An
electronic
switching
circuit
and
an
active
filter
have
been
incorporated
in
the
noise
reduction
section
which
is
the
heart
of
the
audio
circuit.
Also
audio
capacitors
and
low-noise
resistors
are
used
in
the
level
sensor
section.
Asa
result,
noise
which
is
generated
when
the
audio
head
(Hi-Fi
head)
is
switched
has
been
greatly
reduced,
making
for
highly
linear,
pure,
clear
Hi-Fi
sound.
Audio Head Switched Timing
This unit Conventional system
<Switching noise>
Jog/Shuttle Search
@ Incorporates double DD reel motor
The tape runs smoothly in the forward and reverse
directions, and the mechanism has good response.
@ Variable speed playback by microprocessor
control
By using the shuttle dial, the playback speed can be varied
according to the angle of rotation of the dial, and by using
the jog dial, the playback speed can be varied according to
the direction and speed of rotation of the dial. This is
useful for frame alignment when searching for the editing
points.
Flying Erase (rotary erase) Head
This head is installed ahead of the recording head on the rotary
head cylinder. In other words, because only the track on which
the recording is to be made is erased by the erase head, there is
no noise or over-erasure, and clean simple recording and
insert editing can be done without any colour stripe beat being
produced.
Also, each rotating head is controlled by a microprocessor,
resulting in improved accuracy during editing.
Portion corresponding Portion corresponding
to beginning of recording to end of recording
— Tape travel direction| Signal has been
erased, hence blank
portion appears
Old recorded
portion
Newly recorded
portion
Erasing method
Newly recorded portion
Full erase using
fixed erase head
Colour strip
to overwriting of new
recording on old
—— Tape travel direction
Rotary erase head
Picture is joined cleanly
Flying erase due to
rotary head
Newly
recorded recorded
portion portion
Newly recorded portion

<_ CONTROLS AND THEIR FUNCTIONS
Upper Panel
4 5 6 mee @
-———— of] ere oo
be | coro
SI (pees
aes ol
j—__—_] |
16
acs]
Middle
Panel
ifs
ner
ee
Lower Panel
i) Audio (CH1) Level Meter
The meter indication can be switched between Normal/
HD by means of Audio Monitor Selector @.
Audio (CH2) Level Meter
The meter indication can be switched between Normal/
HD by means of Audio Monitor Selector @. If you set
Audio CH2 Selector @ (Rear Panel) to the “TIME CODE”
side, you cannot use normal audio CH2. In this case, if you
set Audio Monitor Selector @ to the “NORM” side, the
audio (CH2) level meter will indicate the existence of a
time code signal if present.
weds
Hormel
tcl
pauses
3] Video Level/Tracking Meter
When the unit-is in the playback mode, this meter
functions as a tracking meter. in other modes, it functions
as a video input level meter.
4] Cassette Holder
6 Eject Button
Press this button to remove the cassette tape.

eee
nS
@
®
HD REC Switch
ON:
HD
sound
and
normal
sound
are
recorded.
OFF:
Only
normal
sound
is
recorded.
HD REC IINPUT Selector
NORM:
—
Normal
input
signal
is
recorded
on
HD
track.
HD:
HD
input
signal
is
recorded
on
HD
track.
NOTCH Selector
Normally
use
the
selector
in
the
“OFF”
position.
Place
this
selector
to
“ON”,
when
playing
back
S-VHS
tapes
recorded
on
other
VTRs
or
when
chrominance
noise
appears
in
the
luminance
signal
(Y/C
signal
is
not
separated
completely).
eWhen
the
tapes
recorded
through
the
S-VIDEO
input
connector
or
recorded
on
the
AG-7500
are
played
back,
set
the
selector
to
the
“OFF”
position.
More
clear
picture
can
be
obtained.
Frame Servo Selector
OFF:
Recording
or
editing
input
signals
other
than
CCIR
standard
signals.
Set the selector to this position when
performing insert editing or assemble editing
onto a tape that has been recorded using a
VTR which does not have a frame servo
function.
When the selector is put in this position,
Frame Lock lamp @ will go out.
FRAME:
_
Recording
or
editing
CCIR
standard
signals.
When
the
frame
servo
is
applied,
Frame
Lock
lamp
@
will
light.
COLOUR:
Recording
or
editing
CCIR
PAL
COLOUR
signals.
When
the
colour
frame
servo
is
applied,
Frame
Lock
lamp
@
will
light.
Audio Limiter Switch
By
setting
this
switch
to
the
“ON”
position,
you
can
record
the
Normal
Audio
signal
without
distortion
even
if
the
audio
input
momentarily
exceeds
the
reference
level.
(Normal
Audio
recording
only)
Audio Mix Rec Selector
TO
CH1:
Normal
CH1
and
CH2
inputs
are
mixed
and
recorded
on
normal
CH1
audio
track.
OFF:
Normal
CH1
and
CH2
are
recorded
separately.
Audio Output Selector
NORM:
Normal
Audio
is
output
from
Audio
Output
Jacks
@.
HD:
If
HD
Sound
is
recorded,
HD
Sound
will
be
output.
If
HD
Sound
is
not
recorded
on
the
tape,
Normal
Audio
will
be
automatically
output
from
Audio
Output
Jacks
@.
Image Selector
NORM:
Normally
place
the
selector
in
this
position.
DETAIL:
More
clear
picture
will
be
obtained
than
“NORM”.
However,
the
S/N
becomes
inferior.
EDIT:
Place
the
selector
to
this
position
when
editing.
However,
the
S/N
of
both
source
and
editor
VTRs
becomes
inferior.
@® Sync Selector
This
selector
is
used
when
recording
or
playing
to
select
one
of
two
types
of
sync
signals
(normal
or
external).
(See
Page
18.)

DO000000
OD00"
CAPSTAM
OVERRIDE
eo a
-f-
@ Fan Motor
@
Auto
Back
Space
Selector
At
“ON”,
spliced
recording
with
out
blank
on
the
picture
can
be
done
in
REC
PAUSE
mode.
©
Controller
Select
When
using
an
optional
editing
controller
or
remote
controller,
set
this
selector
to
a
position
corresponding
to
the
controller
used.
©
Time
Code
Input
Jack
Connect
this
terminal
to
the
output
terminal
of
a
time
code
generator
when
you
wish
to
record
time
code
signals.
Set
the
Audio
CH2
Selector
@
to
“TIME
CODE”.
6
Video
Mode
Selector
Used
to
avoid
mistaken
operation
with
the
colour/black
&
white
automatic
selector
circuit.
B/W: The unit is forcibly set to black & white mode.
AUTO:
Distinguishes
automatically
between
Black
&
White
and
Colour
video
input
signals
or
playback
video
signals.
However,
depending
on
the
signal,
select either
“B/W”
or
“COLOUR?”
if
the
automatic
selector
circuit
does
not
operate
properly.
COLOUR:
The
unit
is
forcibly
set
to
colour
mode.
© Video Input Connector
Connect the video signal to be recorded, such as a video
camera, to this terminal.
@
Audio
CH2
Selector
When
recording
or
playing
back
a
time
code
signal,
set
this
switch
to
the
“TIME
CODE’
side.
When
the
selector
is
set
to
this
side,
you
cannot
use
CH2.
© Sync Input Connector
Connect this connector to a composite sync signal from
a reference sync signal generator when synchronizing
the unit with an external reference sync signal.
®To connect advance sync from TBC.
© Video Output Connector
Connect this toa TV Monitor, video recorder, or time base
corrector.
@ Edit Automatic Stop Selector
By putting this selector in the “ON” position, the VTR will
automatically stop in the event that a servo disturbance
occurs during editing.
@ DOC Output Connector
When it is connected, a dropout detection RF signal will be
output. Connect this to the DOC Input terminal of a time
base corrector.
@ Time Code Output Jack
Connect this jack to the input jack of a time code reader
and play back time code signals.
Set the Audio CH2 Selector @ to “TIME CODE”.
© Audio Monitor Output Jack
You can obtain the audio output selected by Audio
Monitor Selector @ from this terminal.
® Capstan Override Jack
Use this jack when connecting with the Editing Controller
AG-A800.
Connect this jack to the CAP OVERRIDE Jack of the
AG-A800 when synchronizing the capstan with the
recorder (or player) during editing.
© Remote Control Connector
When you wish to operate the unit from a remote location,
connect the optional Remote Search Controller NV-A505
to this Connector. Aiternatively, when you wishtoperform -
editing, connect an optional Editing Controller
(AG-A750, AG-A650, NV-A500 or NV-A960).
© Dubbing Input Connector
Using the optional 7P dubbing cable (AG-C65), connect
this to the Dubbing Output Connector of the source
(playback). Note that you cannot connect this to the
dubbing connector of a 3/4” VTR.