Panasonic OmniVision PV-M2066 User manual

-1-
Combination-VCR
Simplified
Printed in Japan
PV-M2066
R
ORDER NO. MKS9603M316
B6
© 1996 Matsushita-Kotobuki Electronics Industries LTD.
All rights reserved. Unauthorized copying and distribution
is a violation of law.
ITEM SPECIFICATION
Head: 4 rotary heads helical scanning system
Input Level: VIDEO IN Jack (Phono type) 1.0 Vp-p 75
Ω unbalanced
Signal-to-Noise Ratio: SP: more than 43dB
LP/SLP: more than 41dB
Horizontal Resolution: Color/Monochrome: more than 230 lines
Head: Normal Mono: 1 stationary head
Hi-Fi Stereo: 2 rotary heads
Input Level: AUDIO IN Jack (Phono type) - 10dBV 50k Ω unbalanced
Output Level: AUDIO OUT Jack (Phono type) - 8dBV 1k Ω unbalanced
Frequency Response: Normal Mono: SP: 100Hz ~ 8kHz
LP: 100Hz ~ 6kHz
SLP: 100Hz ~ 5kHz
Hi-Fi Stereo: SP/LP/SLP: 20Hz ~ 20kHz
Signal-to-Noise Ratio: Normal Mono: SP: more than 42dB
LP/SLP: more than 40dB
Hi-Fi Stereo: SP/LP/SLP: more than 60dB
Wow and Flutter: Normal Mono: SP: Less than 0.2% WRMS
LP: Less than 0.3% WRMS
SLP: Less than 0.4% WRMS
Hi-Fi Stereo: Less than 0.015% WRMS
Broadcast Channels: VHF 2 ~ 13, UHF 14 ~ 69
CATV Channels: Midband A through I (14 ~ 22)
Video
ITEM SPECIFICATION
CATV Channels: Superband J through W (23 ~ 36)
Hyperband AA ~ EEE (37 ~ 64)
Lowband A-5 ~ A-1 (95 ~ 99)
Special CATV channel 5A (01)
Ultraband 65 ~ 94, 100 ~ 125
SP: 1-5/16 i.p.s (33.35mm/sec), LP: 21/32 i.p.s (16.67mm/sec),
SLP: 7/16 i.p.s (11.12mm/sec)
Record/Playback Time: 8 Hrs with 160min. type tape used in SLP mode
FF/REW Time: Less than 5min. (120min. type tape)
Tape width 1/2" (12.7mm) high density tape
20 inch measured diagonal 90 ° deflection
Source: 120V AC ± 10%, 60Hz ± 0.5%
Consumption: Approx. 110 watts (power on), Approx. 7 watts (power off)
EIA Standard (525 lines, 60 fields) NTSC Color Signal
41 ° F(5 ° C) ~ 104 ° F(40 ° C) (Temperature)
10% ~ 75% (Humidity)
21-1/8"(536mm) (W) X 21-3/16"(538mm) (H) X 19-1/16"(484mm) (D)
Approx. 54.0 lbs (24.5 kg)
Tape
Format
VCR
Tuner
Audio
GENERAL
VCR
SPECIFICATIONS
Weight and dimensions shown are approximate.
Specifications are subject to change without notice.
Tuner
Tape
Speed
Picture
Tube
DISPLAY
Power
Television
System
Operating
Condition
Dimension
Weight
Please use this manual together with the Service Manual for Order No. MKS9602M315
Model No. PV-M2046.

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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 advise 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 information by anyone else could result in serious injury or death.
VCR Plus+ and PlusCode are trademarks of Gemstar Development Corporation. The VCR Plus+ system is manufactured under
license from Gemstar Development Corporation.
Equipped with dbx
R
-TV Noise Reduction for true MTS reproduction. dbx
R
-TV Noise Reduction is required for good stereo
separation and audio fidelity.
TABLE OF CONTENTS
DIFFERENCES BETWEEN PV-M2066 and PV-M2046
I. COMPARISON CHART BETWEEN PV-M2066 & PV-M2046
Mechanical Replacement Parts List.............................................................................................................3
Electrical Replacement Parts List ................................................................................................................4
II. EXPLODED VIEW
4. Chassis Frame Section............................................................................................................................5
III. REPLACEMENT PARTS LIST
Electrical Replacement Parts List ................................................................................................................7
IV. SUMMARY
B. Helpful Service Notes and Cautions (please read)................................................................................15
V. ADJUSTMENT PROCEDURES
A. Mechanical Adjustment Procedures ......................................................................................................17
1. Disassembly of Cabinet Parts...........................................................................................................17
3. Adjustment Procedures.....................................................................................................................20
C. Electrical Adjustment Procedures .........................................................................................................21
3. Adjustment Procedures.....................................................................................................................21
VI. SCHEMATIC DIAGRAMS
Stereo Amp / Audio/Video Jack Schematic Diagram.................................................................................22
Main II Partial Schematic Diagram.............................................................................................................25
TV Main Partial Schematic Diagram ..........................................................................................................25
Hi-Fi Audio Schematic Diagram.................................................................................................................26
Hi-Fi Audio/Video Head Amp Schematic Diagram.....................................................................................31
Interconnection Schematic Diagram ..........................................................................................................34
VII. CIRCUIT BOARD DIAGRAMS
Stereo Amp C.B.A......................................................................................................................................37
Main Partial Circuit Board Diagram............................................................................................................37
Hi-Fi Audio/Video Head Amp C.B.A...........................................................................................................38
Hi-Fi Audio C.B.A.......................................................................................................................................39
Audio/Video Jack C.B.A.............................................................................................................................40
TV Main Partial Circuit Board Diagram ......................................................................................................40
Signal Waveform........................................................................................................................................41
VIII. BLOCK DIAGRAM
Hi-Fi Audio/MTS/SAP Black Diagram ........................................................................................................42

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TV Operation
I C.B.A.
Operation II
C.B.A.
VCR Main
C.B.A.
UHF/VHF Tuner
/TV Demodulator Unit
Mechanism
Chassis and
Cassette Up
Ass'y
Frame
TV Main C.B.A.
Frame
Insulated material
(See Note Item 1)
Cassette Up Ass'y
Power
Supply Ass'y
Power
Supply Ass'y
VCR Main
C.B.A.
TV Main
C.B.A.
P1201
Screw (S-3) Stereo Amp
C.B.A.
Support Angle -R
How to place the Stereo Amp C.B.A.:
How to place the Power Supply Ass'y:
B. HELPFUL SERVICE NOTES AND CAUTIONS (Please read)
IV. SUMMARY
ServicingtheVCRSectionandtheTVSection
1. Service Position (1)
Service Position (1) is used for checking and replacing
Mechanical and Electrical parts.
TopositiontheVCRUnitforservicingasshowninFig.2-1,use
the following procedure.
1) Remove Back Cover by removing 7 Screws (S-1) in Fig.
D2, Page 18.
2) Disconnect Degaussing Coil Connector, Speaker Lead
Ass'y P4604, P4605, A/V Jack Connector P4203 and
Earphone Jack Connector P4602 in Fig. D3, Page 18.
3) If necessary, release all cords from Clamper on CRT
C.B.A.
4) CarefullyremoveVCRUnitfromTVCavityandplaceVCR
UnitinthedirectionshowninFig.2-3,Page1-11,included
in PV-M2046 Service Manual.
5) Disconnect connector P4502 on Hi-Fi Audio C.B.A. Then
remove the Stereo Amp C.B.A. by releasing 3 Clampers
from Top Shield Plate Ass'y in Fig. D6, Page 19.
6) RemovetheTopShieldPlateAss'ybyremoving5Screws
(S-3) in Fig. D6.
7) Remove Operation I, II C.B.A.s by releasing 6 Locking
Tabs (L-1) in Fig. D5, Page 18.
8) DisconnectconnectorP801 andremove2Screws(S-11).
Then remove Power Supply Ass'y by disconnecting
connector P1201 in Fig D6.
9) Disconnect3connectorsP201,P202 and P203 ontheTV
Main C.B.A. in Fig. D7, Page 19. (See Note Item 2 Page
1-9, included in PV-M2046 Service Manual.)
10) Remove the TV Main C.B.A. by releasing 4 Locking Tabs
(L-2) and A/C Cord from the frame in Fig. D7.
11) Remove2 Screws(S-4),Screw(S-5),Screw(S-6),Screw
(S-12) and Chassis Angle in Fig. D8, Page 19.
12) Remove VCR Chassis Unit by releasing Locking Tab
(L-3) from the frame in Fig. D8 .
13) Reconnect 3 connectors P201, P202 and P203 betwen
the TV Main C.B.A. and the VCR Main C.B.A.
14) Place the Stereo Amp C.B.A. to Support Angle -R with a
Screw(S-3)asshowninFig.2-1.Thenreconnectconnector
P4502.
15) Carefully place the VCR Chassis Unit and the TV Main
C.B.A. as shown in Fig. 2-1. (See Note Item 1 Page 1-9,
included in PV-M2046 Service Manual.)
16) Remove Screw (S-7) and Screw (S-8) in Fig. D9, Page
19.
17) Disconnect connector P6002 on the VCR Main C.B.A.
coming from the Safety Tab SW. in Fig. D9.
18) OpentheMechanismChassisandtheCassetteUpAss'y.
19) Placethe Power SupplyAss'yon theVCRMain C.B.A. as
showninFig.2-1.Thenreconnectthe2connectorsP1201
and P801.
20) Place the jumper between TP6001 and GND.
21) After servicing, make sure that all wires and leads are
placed in their original position.
Fig. 2-1

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TV Main
C.B.A.
VCR Main
C.B.A.
CRT C.B.A.
Stereo
Amp C.B.A.
A/V Jack
C.B.A.
Clamper
Speaker -R
Speaker -L
P4604
Deflection
Yoke
Connector
P801
Flyback
Transformer
Degaussing Coil Connector
Clamper Clamper
Clamper
Frame
Top Shield
Plate Ass'y
P6002
Anode Cap
Deflection Yoke
P354
Degaussing Coil
Grounding Wire
Safety Tab SW
P6001
P203
P201
P202
Operation I
C.B.A.
Clamper
45°
+
-
Red
White +
-White
Red
Note:
No lead wires or flat cables should
touch any heating parts or the Heat
Sink Plate of IC451, IC801, or Q551.
P4602
P4605
Hi-Fi Audio
C.B.A.
Power Supply
Ass'y
P4502
P4203
P204
P1201
(To P1001
on the Power
Supply Ass'y)
Wire and Lead Position Diagram
After servicing, make sure that all wires and leads are placed in their original position.
It is important for the best operation of the unit.
Fig. 5

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DISASSEMBLY METHOD
1 Back Cover D2 7(S-1) -
2 VCR Unit D3, P354, Anode Cap,
D4 P4203, P4602, P4604,
P4605, CRT C.B.A., 1
DeflectionYoke Connector,
Degaussing Coil Connector
3 CRT Unit D3 4(S-2) 2
4 Operation I D5 P6001, 6(L-1) -
and Operation
II C.B.A.s
5 Power Supply D6 (S-11), P1201, P801 -
Ass'y 2(L-4) 3
6 Stereo D6 P4502 -
Amp C.B.A.
7 Top Shield D6 5(S-3) -
Plate Ass'y
8 TV Main D7 P201, P202, P203, P204, 4
C.B.A. 4(L-2)
9 VCR Chassis D8 2(S-4), (S-5), (S-6), (S-12), 5
Unit Chassis Angle, (L-3)
10 VCR Main D9 (S-7), (S-8), P6002, -
C.B.A. P2501, P3501
11 Cassette Up D10 2(S-9), 2(S-10) 6
Ass'y
12 Mechanism D10 --------------------------- 7
Chassis
Step
/Loc.
No. Part Remove
Fig.
No.
1. DISASSEMBLY OF CABINET PARTS
DISASSEMBLY FLOWCHART
This flowchart indicates the disassembly steps of the cabinet
partsandtheP.C.Boardsinordertogainaccesstothe item(s)
to be serviced. When reassembling, perform the step(s) in the
reverse order.
Caution : Disconnect AC Plug before disassembly.
Fig. D1
A. MECHANICAL ADJUSTMENT PROCEDURES
V. ADJUSTMENT PROCEDURES
Note
A
BC
D
How to read chart shown above :
A : Order of steps in Procedure
When reassembling, perform the step(s) in the reverse
order.
These numbers are also used as the identification
(location) No. of parts in Figures.
B : Part to be removed or installed.
C : Fig. No. showing Procedure or Part Location.
D : Identificationofparttoberemoved,unhooked,unlocked,
released, unplugged, unclamped, or unsoldered.
2(S-1)=2 Screws(S-1); 3(L-1)=3 Locking Tabs(L-1)
Back Cover
1
CRT
Unit
3Operation
I and
Operation
II C.B.A.s
4
VCR Unit
2
Mechanism Chassis
12
Cassette Up Ass'y 11
VCR Main C.B.A.
Stereo
Amp
C.B.A.
6
TV Main C.B.A.8
VCR Chassis Unit
9
Top Shield Plate Ass'y7
Power
Supply
Ass'y
5
10

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Fig. D2
Rear View 1 Back Cover
(S-1)
(S-1)
2 VCR Unit
VCR Unit
Holes (A)
Guide Tabs (A)
Bottom view of VCR Unit
Hole (B)
Tabs (B)
Hole (B)
Fig. D4
TV CRT C.B.A.
Anode Cap
3 CRT Unit
(S-2)
2 VCR Unit
P354 (S-2)
Deflection Yoke
Connector
Degaussing
Coil Connector
P4605 P4602 P4604
P4203
Fig. D3
4 Operation II
C.B.A.
4 Operation I
C.B.A.
(L-1) P6001 (L-1)
Fig. D5

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(S-6)
Chassis Angle
9 VCR
Chassis
Unit
(S-4)
(S-5)
(L-3)
(S-12)
P201
P202
P203
8 TV Main
C.B.A.
(L-2)
(L-2)
(L-2)
P204
6 Stereo
Amp C.B.A.
(S-3)
(S-3)
(S-3)
P801
7 Top Shield
Plate Ass'y
(S-3)
Clamper
(S-3)
Clamper
(S-11) 5 Power Supply
Ass'y
P4502
(L-4)
P1201
Fig. D6
Fig. D8
Fig. D7
P3501
P2501
(S-7)
10 VCR Main C.B.A.
P6002
(S-8)
Fig. D9

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11 Cassette Up
Ass'y
12 Mechanism
Chassis
(S-9)
(S-10) (S-10)
Fig. D10
Reference <Notes> in Chart, Page 17:
1. ToremoveVCRUnitfromTVCavity,proceedwithfollowing
step,
1) LiftuptherearsideofVCRUnitslightlytoraiseTabs(B).
2) Slide VCR Unit out as far as you can.
3) PushupfrontsideofVCRUnitfromunderneathinorder
to raise 2 Guide Tabs (A) into place.
4) Pull VCR Unit all the way out from TV Cavity.
When reinstalling;
EnsurethattheVCRUnitismountedallthewaytothefront.
2. Place unit face down on a soft cloth before removing the
CRT Unit.
3. WhenremovingtheShieldCaseofthePowerSupplyAss’y,
twist and straighten 2 Locking Tabs (L-4) on the Power
Supply Ass’y in Fig. D6. Then remove the Shield Case by
pulling it away from the Power Supply Ass’y.
4. WhendisconnectingorconnectingconnectorsP201,P202
and P203, work with care not to break them.
5. When removing the VCR Chassis Unit, refer to Note Item
3, Page 1-9, included in PV-M2046 Service Manual.
6. When reinstalling the Cassette Up Ass'y, mechanical
adjustment (alignment) should be performed for proper
operation.Please referto“HOWTOINSTALLCASSETTE
UP ASS'Y ONTO MECHANISM CHASSIS” Page 2-28,
included in PV-M2046 Service Manual.
7. WhenreinstallingtheMechanismChassistotheVCRMain
C.B.A.,referto“Removal/InstallationofMechanismChassis
totheVCRMainC.B.A.,”Page1-18,includedinPV-M2046
Service Manual.
3. ADJUSTMENT PROCEDURES
REPLACEMENT OF UPPER CYLINDER
UNIT
1. REMOVAL OF UPPER CYLINDER UNIT
WorkwithextremecarewhenremovingorreplacingtheUpper
Cylinder Unit. Do not touch Video Heads during servicing.
1. Remove 2 Screws with Washers (A) and gently lift the
Upper Cylinder Unit from the shaft, refer to Fig. M2.
Fig. M2
Screws with Washers (A)
3. REPLACEMENT OF UPPER CYLINDER
UNIT
1. Install the Upper Cylinder Unit carefully so that the hole in
theUpperCylinderUnitisproperlymatchedtoalignthehole
ontheUpperCylindertothecenteroftheindentationonthe
D.D. Cylinder. For details on the installation position, refer
to Fig. M4.
Fig. M4
Upper
Cylinder
D.D.
Cylinder
Hole
Indentation

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C. ELECTRICAL ADJUSTMENT PROCEDURES
2. Tighten 2 Screws with Washers (A) shown in Fig. M4.
3. Clean the Upper Cylinder with a deerskin swab (Head
Cleaning Stick) saturated with Ethanol.
Note :
Upon completion of replacement, perform “TAPE
INTERCHANGEABILITY ADJUSTMENT,” Page 2-14,
especially “HORIZONTAL POSITION ADJUSTMENT
OF A/C HEAD,” Page 2-16, included in PV-M2046
Service Manual.
3. ADJUSTMENT PROCEDURES
TV STEREO AMP SECTION
SEPARATION ADJUSTMENT
Purpose:
To separate the L and R Channels of Stereo Signal.
Symptom of Misadjustment:
TheLandRChannelsofStereoSignalwillnotbeseparated
properly resulting in no stereophonic effect.
TP ADJ. MODE INPUT
TP4207 R9001 STOP (ANTENNA INPUT TERMINAL)
MTS (ONLY L CH)
300Hz±5Hz
14% or 7% Modulating
TAPE M.EQ. SPEC.
OSCILLOSCOPE Refer to Descriptions
MTS/SAP SIGNAL below
GENERATOR
Note :
TP4207 : Hi-Fi Audio C.B.A.
R9001 : VCR Main C.B.A.
1. Connect the RF OUTPUT of the MTS/SAP Signal
Generator to the Antenna Input Terminal.
2. Connect the Oscilloscope to TP4207(R CH).
3. Adjust R9001 on the VCR Main C.B.A. so that the signal
level is at minimum as shown in Fig. E5.
10mV 1ms
TP4207(R CH)
Minimum
Fig. E5