Panasonic Z-Mechanism Service Manual

ORDER NO. VRD9802005C2

Video Cassette Recorder

Panasonicml

Z-MECHANISMCHASSIS

I

INTRODUCTION

The Z-Mechanism chassis are built in several Panasonic VHS Video Cassette
Recordersfrom NV-SD and NV-HD series in 1998.

WARNING

A

This service information isdesigned 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
IJroductor

Dt’OdUCtSdealt with in this service information by anyone else could result in serious injury or death.

.

(@1998 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of

law,

Panasonic

CONTENTS

1.

OUTLINE OF ZMECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1-1.

Thetapetransportpath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1-2.

Cassetteholderunit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1-3.
1-4.

ZMechanismComponents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

FLOWCHARTOF LOADING MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

REMOVALOFCASSEITETAPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.

2-1. Removalofcompulsoryloading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2-2. Removalofmanual operation ofMaincam gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

REMOVALOFCASSETTE HOLDER UNIT& MECHANISM Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3,

3-1. Removal ofCassetteholder unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3-2. RemovalofMechanismchassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

DISASSEMBLY/ASSEMBLYMETHOD FORMECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.

4-1. Disassemblyofmechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4-2. Assemblyandphaseadjustment ofmechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4-3. Assemblyofmechanismchassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

PartsAccess Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

MECHANICALADJUSTMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5.

5-1. Tension postposition adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5-2. Backtensionadjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5-3.

5-4. Tapeinterchangeabilityadjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Servicing Fixtures&Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

6.

SELF-TESTINDICATION DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

SERVICE INFORMATION DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7.
7-1.

7-2. TurningonService information Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7-3.
7-4.
7-5.

7-6. Timingchartfrom ModeSWto Systemcontrol lo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

SYSTEM CONTROLCIRCUIT &MECHANISM CONTROLCIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

8.

8-1. STOP3Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

8-2.

8-3. SupplyandTake-upSensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

8-4. SafetyTabSwitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

8-5. DewSensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8-6. Settingtimeforeach mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8-7. OperationofshortCUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8-8. Loading/Unloading Mechanism lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8-9. Cassetteloading/unloadinglock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

8-10. Reel lockoperation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

8-11. Cylinderlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

8-12. Modetransition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

8-13. Poweron reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

8-14. Lineartimecounteroperation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

8-15. Tapespeed inCUE/REVmode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

8-16. Automaticfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

8-17. CUE/REVlockmode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

8-18. FR(Forward/Reverse) search mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

8-19. FF/REWspeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

8-20. FF/REWtime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

EXPLODEDVIEWS &REPLACEMENT PARTS LIST

9.

9-1. MECHANICAL REPLACEMENT PARTS SECTION

Reel brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

NumberofGearPhaseAlignment Pointand Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

P2and P3postsadjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5-4-(I). P2ANDP3 POSTSADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5-4-(2). ADJUSTMENTOFP4 POST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5-4-(3). HEIGHTADJUSTMENT OFA/C HEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5-4-(4). FINE-ADJUSTMENTOF A/CHEAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5-4-(5). ADJUSTMENTOFX-VALUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5-4-(6). FINE-ADJUSTMENT OFX-VALUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

PurposeofService information Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

UseofService Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Service Information Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

TestMode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Stand-byintheSTOP3position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

1. OUTLINEOFZ MECHANISM

‘2’os’Fv=R’3’osT

1-1. The tape transport path

(1)

Mechanism Chassis
Aluminium Chassis has been changed to sheet metal (Thickness: 1.2 mm).

(2)

Capstan position (Cassette-in method/Capstan-in method)
The Tape does not touch the Cassette tape so that the rationalization has been promoted such
as Reel gear pinch up/down mechanism has been deleted.

Deletion of PI post

(3)

FE Head has been installed Limiter so that PI post has been deleted.

(4)

A/C Head base combined with P4 post
A/C Head has been combined with P4 post on the same base.
Change of NC head base type

(5)

The change of the angle winding the tape on A/C head has been reduced by the construction of
A/C head base has been changed from the revolution type to slide base type.
Improvement of P5 post

(6)

P5 post operation has been changed by non-adjustable of the Height and the Tilt adjustment so
that the specification has been improved.

Z Mechanism tape transport path in REV mode

TENSION P“

1-2. Cassette holder unit

(1)Cassette-in operation

The Rackdrive arm drives Main Cam gear by inserting the cassette tape. Consequently, Position
switch detects the cassette-in mode so that Loading motor drives. The mode goes to the Stop

mode from the Cassette-in through the Loading mode.

@) The parts quantity reduction of Cassette holder unit.

(Z Mechanism: 21 pieces, K Mechanism: 36 pieces)
a. Release lever has been installed in Right Side Plate.
b. Cassette guide has been installed in Front Panel unit.
c. Safety lever spring is made by the resin.
d. Opener lever has been changed into the single opener type.
e. One side of Side Plate unit is hung on Chassis in order to fix it.

@ Improvement of the cassette insertion

(The force ofthe cassette insertion Z Mechanism: Approximately 400gm.,

The tooth pitchof Worm gearwhich hasbeen extended against the previous model, is located
on the Motor so that Worm gear can be reversed. Consequently, the Motor rotates before the

K Mechanism: Approximately 600gm.)

1-3.

insertion spring (the combined spring) is working when the cassette tape is inserted, so that
the repelled force of the insertion spring has been reduced as differing from the present
model.

@ Small-sized Cassette holder unit (Thinned unit)

a. The Wiper arm method which has been adopted, assigned Wiper arm between Cassette

Holder Plate and Side Plate so that the small-sized of the width has been realized.

b. To prevent the increment of parts quantity such as Safety Iever is used for Pre-open

mechanism shown in the present model, and the small-sized unit has been realized by
inclining one portion of the Lgroove in Side Plate.

c. The part of driving change-over is located in the nearest to the center of Reel so that the

depth size is compacter.

Reel brake

(1)

Supply Reel Brake is used for Tension Regulator which is composed of the conventional Main

brake and the soft brake function.

Take-up Reel Brake is used as Band Brake unit in order to correspond with Supply Reel

(2)

Tension Regulator performance:

x

This is composed of Tension regulator and brake. The tape always is given the tension

Brake.

against

the advance direction by Tension band.

Construction of Supply reel tension regulator

(3)

Comparison ofthe construction with the conventional model

2

I

Z Mechanism

K Mechanism

Tension Arm Shaft

Bearing construction

Tension Band

Braking method

Operating mode and necessary function

Mechanismmode

Cassette down

Completion of Loading

REV

PLAY. FF
STOP

(4)

Construction of Take-up brake

Resin

Felt less Lumiller

Tension regulator

I Necessary function

Prevention of the tape slag
(Soft brake)
Prevention of the tape slag
(Soft brake)
Prevention of in Play mode

to REV mode (Soft brake)

Backtension adjustment
Main brake function

Tension arm

Felt Lumiller
Main & soft brake

Operation

Soft brake

Tension regulator

Tension regulator

Same as the conventional
Tension regulator

Take-up brake is used Band brake as well as Supply brake depend on corresponding with Band

brake is adopted at the Supply Side.

Mechanism mode

EJECT-MID

REV

PLAY

STOP

FF/REW

1-4. Number of Gear Phase Alignment Point and Replacement Parts

Number of Gear Phase-Alignment Point

G2 Mechanism

G Mechanism

K Mechanism
Z Mechanism

Number of Replacement Parts”(including the Screw and Washer)

Function

Soft brake
Soft brake

Release of brake

Brake

Release of brake

12Alignment Points
12Alignment Points

6 Alignment Points
4 Alignment Points

Band

On
On

off

On

off

G2 Mechanism

G Mechanism

K Mechanism
Z Mechanism

I

3

Approx.170 Pieces
Approx. 150 Pieces
Approx. 100 Pieces

Approx. 70 Pieces

FLOW CHART OF LOADING MECHANISM

LOADING MOTOR

MAIN LEVER

I

l+TBRAKEARM UNITI

+ CONVERSION LEVERA I

T LOADING GEAR

CASSITE HOLDER UNIT

S LOADING GEAR

SS BRAKE ARM UNIT

S,T INCLIND

(P2, P3 POST)

MAIN CAM GEAR

PINCH ARM UNIT

DRIVE RACK ARM

—

—

—

Supplv

Inadinn mmr

Motorcoupling

Wormgear

Wormwheelgear

A

Centergear

Take-uploadinggear

\ Pincharmunit

\

,Loading rack

T

—.

Main-lever

Loafingmotor

Y

P,armunit-n

,.

,, w

..

...

b

...

/

gear

IT

5