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ORDER NO. VRD9802005C2

, ServiceManua Video Cassette Recorder
Panasonicml
Z-MECHANISMCHASSIS

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

.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 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'OdUCtS with in this service information by anyone else could result in serious injury or death.
dealt

q " (@1998 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying and

Panasonic distribution is a violation of law,
CONTENTS
1. OUTLINE OF ZMECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-1. Thetapetransportpath ................................................................ 1
1-2. Cassetteholderunit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 e
1-3. Reel brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-4. NumberofGearPhaseAlignment Pointand Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ZMechanismComponents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FLOWCHARTOF LOADING MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. REMOVALOFCASSEITETAPE ............................................................. 6
2-1. Removalofcompulsoryloading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2-2. Removalofmanual operation ofMaincam gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3, REMOVALOFCASSETTE HOLDER UNIT& MECHANISM Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3-1. Removal ofCassetteholder unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3-2. RemovalofMechanismchassis .......................................................... 8
4. DISASSEMBLY/ASSEMBLYMETHOD FORMECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4-1. Disassemblyofmechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4-2. Assemblyandphaseadjustment ofmechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4-3. Assemblyofmechanismchassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
PartsAccess Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5. MECHANICALADJUSTMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5-1. Tension postposition adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5-2. Backtensionadjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 a
5-3. P2and P3postsadjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5-4. Tapeinterchangeabilityadjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
Servicing Fixtures&Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
a
6. SELF-TESTINDICATION DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7. SERVICE INFORMATION DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7-1. PurposeofService information Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7-2. TurningonService information Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7-3. UseofService Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7-4. Service Information Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7-5. TestMode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7-6. Timingchartfrom ModeSWto Systemcontrol lo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8. SYSTEM CONTROLCIRCUIT &MECHANISM CONTROLCIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8-1. STOP3Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8-2. Stand-byintheSTOP3position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 e
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 a
9. EXPLODEDVIEWS &REPLACEMENT PARTS LIST
9-1. MECHANICAL REPLACEMENT PARTS SECTION
1. OUTLINE OF Z MECHANISM
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.
(3) Deletion of PI post
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.
(5) Change of NC head base type
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.
(6) Improvement of P5 post
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

`2'os'Fv=R'3'osT
TENSION P"
1-2. Cassette holder unit
(1)Cassette-in operation
The Rack drive 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 of the cassette insertion Z Mechanism: Approximately 400gm.,
K Mechanism: Approximately 600gm.)
The tooth pitch of Worm gear which has been extended against the previous model, is located
on the Motor so that Worm gear can be reversed. Consequently, the Motor rotates before the
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 L groove 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.
1-3. Reel brake
(1) Supply Reel Brake is used for Tension Regulator which is composed of the conventional Main
brake and the soft brake function.
(2) Take-up Reel Brake is used as Band Brake unit in order to correspond with Supply Reel Brake.
x Tension Regulator performance:
This is composed of Tension regulator and brake. The tape always is given the tension against
the advance direction by Tension band.
(3) Construction of Supply reel tension regulator
Comparison of the construction with the conventional model

2
I Z Mechanism K Mechanism
Tension Arm Shaft Resin Tension arm
Bearing construction
Tension Band Felt less Lumiller Felt Lumiller
Braking method Tension regulator Main & soft brake

Operating mode and necessary function

Mechanismmode I Necessary function Operation
Cassette down Prevention of the tape slag Soft brake
(Soft brake)
Completion of Loading Prevention of the tape slag Tension regulator
(Soft brake)
REV Prevention of in Play mode Tension regulator
to REV mode (Soft brake)
PLAY. FF Back tension adjustment Same as the conventional
STOP Main brake function Tension regulator

(4) Construction of Take-up brake
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 Function Band
EJECT-MID Soft brake On
REV Soft brake On
PLAY Release of brake off
STOP Brake On
FF/REW Release of brake off
1-4. Number of Gear Phase Alignment Point and Replacement Parts

Number of Gear Phase-Alignment Point
G2 Mechanism 12 Alignment Points
G Mechanism 12 Alignment Points
K Mechanism 6 Alignment Points
Z Mechanism 4 Alignment Points
Number of Replacement Parts"(including the Screw and Washer)
G2 Mechanism Approx.170 Pieces
I
G Mechanism Approx. 150 Pieces
K Mechanism Approx. 100 Pieces
Z Mechanism Approx. 70 Pieces

3
Z Mechanism Components

Main cam gear

Pinch arm

Drive rack arm

lit

Take-up brake arm unit

Take-up reel table

Conversion lever A

BOITOM VIEW

,,

SS brake arm
-Take-uploadingarm

Supply loadingarm

Centerclutch

ConversionIeverB

4
FLOW CHART OF LOADING MECHANISM

q1
LOADING MOTOR MAIN CAM GEAR

PINCH ARM UNIT --

CASSITE HOLDER UNIT DRIVE RACK ARM --

SS BRAKE ARM UNIT --

MAIN LEVER
I
S,T INCLIND
T LOADING GEAR S LOADING GEAR
(P2, P3 POST)

q