Panasonic AG-DS850HP User manual

ORDER NO. VSD9605M201
Service
Manual
Panasonic
SVS
|
[li-lF
Editing Video Cassette Recorder
AG-DS850HP
Editing Video Cassette Player
AG-DS840HP
YP
lease
use
this
simplified
service
6
manual
with
the
service
manual
for
Model
AG-
DS850P_
Velume
1
(Order
No.
VSD9403M244),
Volume
2
(Order
No.
VSD9404M245)
and
Model
AG-DS840P
(Order
No.
VSD9411M264).
Also
please
refer
to
the
supplement
service
manual
for
AG-
DS850P
and
AG-
DSB40P.
© 1996 Matsushita Electric Industria! Co., Ltd. All right) reserved.
Unauthorized copying and distribution is a violation of hw.
Panasonic.

A WARNING
This
service
information
is
designed
for
experienced
repair
technicians
only
and
is
not
designed
for
use
by
the
general
public.
It
does
not
contain
warnings
or
cautions
to
advice
non-technical
individuals
of
potential
dangers
in
attempting
to
service
a
product.
Products
powered
by
electricity
should
be
serviced
or
repaired
only
by
experienced
professional
technicians.
Any
attempt
to
service
or
repair
the
product
or
products
dealt
with
in
this
service
manual
by
anyone
else
could
result
in
serious
injury
or
death.
INTRODUCTION
This
Simplified
Service
Manual
describes
the
changes
from
Panasonic
S-VHS
Hi-Fi
Video
Cassette
Recorder
“Player
model AG-DS850P“AG-DS840P
to
AG-DS850HP“AG-DS840HP.
It
contains
the
list
of
supplement
service
manuals
for
AG-DS850P/AG-DS840P
and
the
replacement
parts lists.
Please use this simplified Service Manual together with AG-DS850P Service Manuals
(Order No. VSD9403M244 (Vol. 1), VSD9404M245 (Vol. 2)), AG-DS840P Service Manual
(Order
No.
VSD9411M254)
and
Supplement
service
manuals
listed
later.
CONTENTS
INTRODUCTION
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1
SAFETY
PRECAUTIONS
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1.
AG-DS850P
SUPPLEMENTS
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3
2.
AG-DS840P
SUPPLEMENTS
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CECE
PPP
PPR
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5
3. EXPLODED VIEWS & REPLACEMENT PARTS LISTS «vvrrssrrsserrrrerrees PRT-1

SAFETY PRECAUTIONS
GENERAL GUIDELINES
1.
When
servicing
observe
the
original
lead
dress.
!f
a
short
circuit
is
found,
replac
all
parts
which
have
been
overheated
or
damaged
by
the
short
circuit.
.
After
servicing,
see
to
it
that
all
the
protectiv
devices
such
as
insulation
barriers,
insulation
papers
shields
are
properly
installed.
.
After
servicing
make
the
following
leakage
current
checks
to
prevent
the
customer
from
being
exposed
to
shock
hazards.
LEAKAGE CURRENT COLD CHECK
1
2.
TO
Unplug
the
AC
cord
and
connect
a
jumper
between
the
two
prongs
onthe
plug.
Measur
the
resistance
value,
with
an
ohm
meter,
between
the
jumpered
AC
plug
and
each
exposed
metallic
cabinet
part
on
the
equipment
such
as
screwhead
connectors,
contr
shafts,
etc.
When
the
exposed
metallic
part
has
a
return
path
to
the
chassis,
the
reading
shoulb
be
between
1IMQ
and5.2MQ.
When
the
exposed
metal
dose
not
have
a
return
path
to
the
chassis,
the
reading
must
be
©.
AC VOLTMETER
Hot-Check Circuit
COLD
WATER PIPE
(EARTH GROUND)
APPLIANCE’S
EXPOSED
METAL PARTS
15002 10W
Figure 1
LEAKAGE CURRENT HOT CHECK (See Figure 1)
1.
2:
Plug the AC cord directly into the AC outlet.
Do
not
use
an
isolation
transformer
for
this
check.
Connect
a
1.5K,
10W
resistor,
inparallel
with
0.15
u
F
capacitor,
between
each
exposed
metallic
part
on
the
set
an
a
good
earth
ground
such
as
a
water
pipe,
as
shown
in
Figure
1.
.
Use
an
AC
voltmeter,
with
1000
ohms/
volt
or
more
sensitivity,
to
measur
the
potential
across
the
resistor.
.
Check
each
exposed
metallic
part,
and
measure
the
voltage
at each point.
.
Reverse
the
AC
plug
in
the
AC
outlet
repeat
each
of
the
above measurements.
. The potantial at any point should not exceed 0.75 volts
RMS.
A
leakage
current
tester
(Simpson
Model
229
equivalent)
may
be
used
to
make
the
hot
checks,
leakage
current
must
not
exceed
1/2
milliamp.
In
case
a
measurement
is
outside
of
the
limits
specified,
there
is
a
possiblity
of
a
shock
hazard,
and
the
equipment
should
be
repaired
and
rechecked
before
it
is
returned
to
the
customer.
ELECTROSTATICALLY SENSITIVE( ES) DEVICES
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field-effect
transistors and semiconductor
“chip” components. The
following techniques should be used to help reduce the
incidence of component damage caused by static electricity.
1.
Immediately before handling any semiconductor
component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known
earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed
for potential shock reasons prior to applying power to the
unit under test.
. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
. Use only a grounded tip soldering iron to solder or
unsolder ES devices.
. Use only an anti-static solder removal device classified as
“anti-static” can generate electrical charges sufficient to
damage ES devices.
. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
. Do not remove a replacement ES device from its protective
package untilimmediately before you are ready to instal!
it. (most replacement ES devices are packaged with leads
electrically shorted together by conductive foam,
aluminum foil or comparable conductive material).
. Immediately before removing the protective material from
the leads of replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
CAUTION: Be sure no power is applied to the chassis or
circuit, and observe all otner asfety precautions.
. Minimize bodily motions when handling unpackaged
replacement ES devoces. (Otherwise harmless mother such
as the brushing together of your clothes fabric or the lifting
of your foor from a carpeted floor can generate static
electricity sufficient to damage an ES device).

1. AG-DS850P SUPPLEMENTS
Bulletin . Effective
No Sub ject from
VSD9410S8250 Correction of Service Manual
VSD9410S251 | 2 Change of Parts Number a
VSD94108251 3 Change of EP-ROM(Ver Up) DAT...
VSD9410S8251 4 Change of Parts List DAT...
VSD94108251 5 Change of Screw DAT...
VSD94108251 6 Change of Parts Number E4T...
VSD9410S251/ 7 Improvement of Temp. Chara. & H.Noise on Chroma EAT...
VSD94108251 8 Improvement of S-VHS Deviation (fo) Adjustment EAT...
VSD9410S251 9 Reduction of Fan Motor Noise EAT...
VSD9410S251; —:10 Prevention of Screws Contacting the Capstan EAT...
VSD9410S251; 11 Elimination of Part E4T...
VSD9410S252; 12 Change of TBC (1) ©. B.A | FAT...
VSD94108252 13 Change of VIDEO |/0 C. B. A FaT...
VSD94108252 14 Change of SERVO/SYSCON C. B. A FAT...
VSD94108253 15 Elimination of Deleted Parts FAT...
VSD9410S253 | 16 Improvement of Video Monitor Output Signal F4aT...
VSD94108253| 17 __—«(|Change of Parts Number FAT...
VSD9410S253 18 Change of EP-ROM (Ver. Up) Ae
1VSD9410S253/ 19 (Countermeasure of One Frame Editing Fa...
VSD9410S253
VSD94108253 23 Expansion of Y/C Timing Adjustment Range G47...
VSD9410S253 24 _‘|Change of IC
VSD9410S253 25 Change of EP-ROM (Ver. Up) G4...
VSD9410S8253! 26 [Accidental Erasure of Y-DNR Latch G47...
VSD9410S254 2] Transistor Change HAT...
VSD9410S8255 28 Change of IC H47...
VSD94108255 29 Expansion of Carrier Balance Adjustment Range H4T...
VSD94108255 30 Countermeasure of No Picture or Black Streaking H4T...
VSD9410S256| 31 Countermeasure of Random Sparkling Noise Har...
VSD9410S256 32 Change of Specification for Adjustment H47...
VSD94108257 33 Change of Parts List 147...
VSD94108257 34 Change of EP-ROM (Ver. Up) {| 147...
VSD9410S258 35 {Addition of Connector 147...
VSD9410S258 36 Countermeasure for Color Change l47...
VSD94108258 37 Change of IC Jat...
VSD9410S258 38 Improvement of Distortion of Hecdphones Output (Mod1) J4y...
VSD9410S258| 39 | Improvement of Distortion of Hecdphones Output (Mod2) i ee
VSD9410S258 40 Improvement of One Frame Editing Jay...
VSD94108258 41 Countermeasure for Black output in Jog Mode | Jal...
VSD9410S258 42 _|Countermeasure for Accidental Latch of Y-DNR Jy...
VSD9412S259 43 Change of Mechanical Parts C47...
VSD9501S286 44 Change of TBC (1) C. B.A K41...
VSD9501S286 45 Reduction of Jitter K4]. ..
VSD95018286 46 Countermeasure for Flicker | K4l..
VSD9501S286| 47 __—s[Reduction of Skew at Edit Point K47. ..
VSD9501S286 48 [Expansion of SYSTEM SC PHASE ADJ. Range LAT...
VSD9501S286 49 Addition of ACK Function & Improvement of Y Signal Chara LAT ..
VSD9501S286 90 _|Change of Mechanical Parts E. EAL os

Order No
Bulletin
No
51
Sub ject
Elimination of CAC Y/C Timing Adjustment
52
t
Effective
from
Improvement of Low Video Signal Recording
93
Countermeasure of Holizontal Line
54
Improvement of Video Frequency Response
55
Change of Part
56
Improvement of Cassette Compartment
57
Correction of Service Manual
98
Countermeasure of P.C. Board Crack
59
Change of IG
VSD9506S201|
60
Change of EP-ROM (Ver. Up)
VSD9506S201
61
Change of Microcomputer
VSD95068215|
62
(Countermeasure of Y-DNR Mulfunction
VSD95068215
63
Change of EP-ROM(Ver. Up)
VSD9506S215 |
64
Improvement of the Motor Drive Circuit
VSD95068215
65
Prevention of Sync-generator Mul function
VSD9506S216
66
Change of Microcomputer
VSD95068216
67
Prevention of Audio No Recording
VSD95068217
68
Change of Capaciror
VSD9605S206
VSD9605S206
VSD9605S207
69
Change of Part
Inprovement of Picture Quality
Countermeasure of Time code Mulfunction
Change of SERVO & SYSTEM CONTROL C. B.A.
Change of TBC (1) C.B.A.
Change of Head Amp C. B. A

2.
AG-DS840P
SUPPLEMENTS
Bul
letin
;
Effective
Order
No
No
Sub
ject
<com
VSD9410S256
4
Countermeasure
of
Random
Sparkling
Noise
ie
VSD9410S256
2
Change
of
Specification
for
Adjustment
H4T.
.
VSD9410S258
3
Addition
of
Connector
(AT...
VSD94108258
4
Countermeasure
for
Color
Change
147...
VSD9410S258
5
Change
of
IC
J4T..
VSD94108258
6
Improvement
of
Distortion
of
Hecdphones
Output
(Mod1)
JAT..
VSD9410S258
7
Improvement
of
Distortion
of
Hecdphones
Output
(Mod2)
L4T..
VSD94108258
8
_|Improvement
of
One
Frame
Editing
JAT.
.
VSD9410S258
9
Countermeasure
for
Black
output
in
Jog
Mode
JAT...
VSD9410S258
10
Countermeasure
for
Accidental
Latch
of
Y-DNR
|
JA4T..
VSD94128259
11.
{Change
of
Mechanical
Parts
CAT...
VSD9501S286
12
Change
of
TBC
(1)
C.
B.
A
KAT.
.
VSD9501S286
13
Reduction
of
Jitter
KAT..
VSD9501S286
14
Countermeasure
for
Flicker
KAT..
VSD9501S286
15
Reduction
of
Skew
at
Edit
Point
K4T..
VSD95018286
16
Expansion
of
SYSTEM
SC
PHASE
ADJ.
Range
K4T...
VSD9501S286
17
Improvement
of
Y
Signal
characteristics
KAT...
VSD9501S286
18
Change
of
Mechanical
Parts
LAT...
VSD95018286
19
Elimination
of
CAC
Y/C
Timing
Adjustment
ee
VSD9501$286
20
Countermeasure
of
Holizontal
Line
LAT...
VSD9501S286
21
Improvement
of
Video
Frequency
Response
LAT...
VSD9501S294
23
Improvement
of
Cassette
Compartment
C5T...
VSD95068201
24
Countermeasure
of
P.C.Board
Crack
BST...
VSD95068201
25
Change
of
IC
BST...
VSD95068201
26
Change
of
EP-ROM
(Ver.
Up)
BST...
VSD95068201
ai
Change
of
Microcomputer
|
BST...
VSD9506S8215|
28
Countermeasure
of
Y-DNR
Mul
function
BOT...
VSD95068215
29
Change
of
EP-ROM(Ver.
Up)
BOT...
VSD9506S215|
30
_—i|
Improvement
of
the
Motor
Drive
Circuit
BST...
VSD95068215
31
Prevention
of
Sync-generator
Mul
function
BOT...
VSD95068217
32
Change
of
Capaciror
BOT...
VSD95068219
33
Change
of
Part
DST...
VSD95068220
34
Inprovement
of
Picture
Quality
E57...
VSD9605$206|
37
Change
of
SERVO
&
SYSTEM
CONTROL
C.B.
A.
b
EST.
3
VSD9605S206
38
E57...
t
Change of TBC (1) C.B.A.

Exploded Views & Parts Lists

NOTES
1. © Be sure to make your orders of replacement parts according to this list.
@®'<R>' in Remark column indicates recommended parts.
@'<M>' in Remark column indicates needed in the periodical maintenance.
2. IMPORTANT SAFETY NOTICE
Components identified by '<!>* have special characteristics imporant for safety.
When replacing any of these components, use only the original ones.
Meaning of symbol '<!>" on this pants list is exactly the same as symbol LNon Schematic and Circuit
Board Diagrams.
3, Unless otherwise specified ;
All resistors are in (Q), K=1,000Q, M=1,000kQ.
All capacitors are in (F), U=10*F, P=10'? F.
4. ITEM NUMBERS WITH CAPITAL LETER E
Item numbers with capital leter E (Example:€1, &2,...) in RefNo. column mean that the pars are
listed with the E item numbers in the exploded views.
5, The main assembled parts are shown below C.B.A. marked with ‘MS.
6. When ordering parts, use parts No. only form Part No. column.
7. Printed circuit board assembly with mark.(RTL) is no longer available after discontinuation of the
product.
8. Abbreviations for parts ;
-- NAME -- -- DESCRIPTION --
C.CAPACITOR CERAMIC CAPACITOR
C.CAPACITOR CH CERAMIC CHIP CAPACITOR
E.CAPACITOR ELECTROLYTIC CAPACITOR
G.CAPACITOR GLASS CAPACITOR
M.CAPACITOR MICA CAPACITOR
P.CAPACITOR PLASTIC FILM CAPACITOR
§.CAPACITOR SEMI-CONDUCTOR CAPACITOR
T.CAPACITOR TANTALUM CAPACITOR
TRIMMER TRIMMER
C.RESISTOR CARBON RESISTOR
F.RESISTOR FUSE RESISTOR
M.RESISTOR METAL OXSIDE RESISTOR
M.RESISTOR CH METAL OXSIDE CHIP RESISTOR
S.RESISTOR SOLID RESISTOR
V.RESISTOR VARIABLE RESISTOR
W.RESISTOR WIRE WOUND RESISTOR
COMBI. TR-R TRANSITOR-RESISTOR COMBINATION PARTS
COMBI. R-R RESISTOR-RESISTOR COMBINATION PARTS
COMBI. C-R-L CAPACITOR-COIL COMBINATION PARTS
C.B.A.
CIRCUIT
BOARD
ASSEMBLY
|
See sete, oe ce ete es ee ees es
SERVICING FIXTURE & TOOL LIST
ee
z |_|
| |
VEMBO80HOFP | VHS ALIGNMENT TAPE RETAINING RING REMOVER I
VFKO329
POST
ADJ.
SCREWORIVER
1
(30m/4nm)
VFKO132 BACK TENSION METER 1 | (T2-H7-UM) HEX. WRENCH SET
(TENTELOMETER, MOLYTONE GREASE
MADE IN U.S.A.) S.C.R. GREASE
VFKO191 POST ADJ. PLATE HEAD CLEANING STICK
DIAL TORQUE GAUGE
PLASTIC CLAMPER ONLY
ADAPTOR FOR VFK0133
REEL TABLE HEIGHT GAUGE
TENSION POST ADJ. FIXTURE
TENSION SENSOR ADJ. FIXTURE | 1 |
H-POSITION ADJ. SCREWDRIVER
FINE ADJ. SCREWDRIVER
(3am PHI)
POST HEIGHT ADJ. FIXTURE
L TYPE SCREWDRIVER
FAN TYPE TENSION GAUGE
EXTENDER BOARD 100P
EXTENDER CODE 13P
EXTENDER OODE 40P
EXTENDER BOARD 64P
PRT —-1

EXPLODED VIEWS ~—s PACKING PARTS SECTION
PACKING CASE
PACKING CASE
CUSHION (LEFT TOP)
CUSHION (RIGHT TOP)
CUSHION (LEFT BOTTOM)
CUSHION (RIGHT BOTTOM)
PAD
OPERATING INSTRUCTIONS
OPERATING INSTRUCTIONS

1. CHASSIS PARTS SECTION
Ke Zz
5
a
se} QD
2
ly ao
REV TENSION
PRT -3