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ORDER NO. VRD9712040B8
Service Hints Video Cassette Recorder
Z-MECHANISM CHASSIS
C 1998 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.
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.
INTRODUCTION
This service hint contains actual repair service result which will allow service personnels to understand and
service Z Mechanism, have been got the repair data of Z Mechanism occurred in the market actually.
We expect it will help you to provide the quick and accurate repair service to the customers' VTR mounted
Z mechanism.
REMARKS
As mentioned in INTRODUCTION, this service hint have been published by Z Mechanism getting actual repair
service data occurred in the market.
Therefore, we expect you will send us the similar repair data for any kinds of models with your cooperation in
order to publish the useful technical informations like service hint.
CONTENTS
Z Mechanism phase alignment and checking points ------------------------------------------------- 1
Phenomenon : Cassette tape is not inserted / Tape tangles --------------------------------------- 2
Phenomenon : Cassette tape is not inserted / Cassette tape is ejected ------------------------ 3
Phenomenon : Cassette tape can not ejected / Abnormal sound in FF/REW mode --------- 4
Phenomenon : Tape is not running / Abnormal sound in Playback mode ---------------------- 5
Phenomenon : Cassette tape is not inserted / Loading is not done ------------------------------- 6
Phenomenon : Tape slack (Self-Test Indication Display F05) -------------------------------------- 7
Phenomenon : Cassette tape can not be ejected ------------------------------------------------------ 8
Phenomenon : Blue back in Playback mode (No picture or noisy picture) ---------------------- 9
Phenomenon : A tape is not inserted / Noisy picture in REV mode ------------------------------- 10
Phenomenon : Tape is not running (Capstan does not rotate) ------------------------------------- 11/12
Self-Test Indication Display F05 or H02
Z Mechanism phase alignment and checking points
There are 4 phase alignments in Z Mechanism. 3 phase alignments have to be done
in Eject position and 1phase alignment has to be done in Cassette down position.
The phase alignments are able to be checked at the following 4 points.
1. Position switch (Mode Switch)
Rotate Position switch until it reaches to click position.
2. Main cam gear
Adjust the hole of Main cam gear and the penetration hole of Mechanism chassis.
3. Loading rack
Adjust the hole that sets the position of Loading rack and the penetration hole of
Mechanism chassis.
4. Wiper arm and Drive rack
Adjust the hole of Drive rack and the gear hole of Wiper arm.
Position switch Main cam gear
Click position of Position switch The hole of Main cam gear and the penetration
(Check the phase alignment in Eject mode) hole of Mechanism chassis
(Check the phase alignment in Eject mode)
Loading rack Wiper arm and Drive rack
The Hole of loading rack and the penetration Assign the hole of Drive rack and the hole of
hole of Mechanism chassis Wiper arm on the straight line.
(Check the phase alignment in Eject mode) (Check the phase alignment in Cassette down
position)
In disassembly and assembly of Z Mechanism, there are 3 phase alignments at gear portion and 4
phase alignments related to arm and lever.
1. Main cam gear 4. Take up / Supply loading arm 6. Conversion lever, P5 arm, Main lever
2. Position switch 5. Drive main arm 7. Drive rack arm
3. Loading rack
-1-
Phenomenon : Cassette tape is not inserted / Tape tangles
Diagnosis and Disposal
Checking Judgement Disposal
Cassette tape does not Break-down of the plastic Replacement of Main
move to Cassette down portion in Main shaft shaft (VXP1730)
position
Tape tangles Deformation of Side plate Replacement of Side
or out of gear phase alig- plate (R) unit (VXA5740)
nment in Wiper arm and
Drive rack
Parts location
Top Plate Remove of Cassette holder unit
Cassette holder plate 1. Remove Top Panel and Front panel unit.
Remove 2 screws located at both left and
right side of Top Panel and Top Panel.
Unlock 4 tabs located at the top of Front
panel unit and 3 tabs located at the bottom
of Front panel unit. Remove Front panel unit.
2. Remove Top plate.
Unlock 4 tabs located at both left and right
side of Top plate softly and remove Top plate.
3. Remove Cassette holder plate.
Keep pressing 2 stoppers on Cassette holder
plate and press Cassette holder plate to the
Main shaft rear of VTR and remove it from left and right
side plate unit.
Side plate (R) unit
4. Remove Left and Right side plate unit.
Remove Connection spring of Drive gear and
remove 3 red screws and remove Left and
right side plate unit.
5. Remove Main shaft and replace it.
Broken
The plastic portion in Main shaft is broken so that Cassette holder unit can not advance.
-2-
Phenomenon : Cassette tape is not inserted/Cassette tape is ejected
Diagnosis and Disposal
Checking Judgement Disposal
Cassette tape floats Deformation of Drive rack Replacement of Drive
during loading arm located under Main rack arm (VML3165)
cam gear
Parts location
Connection spring
Loading motor Main cam gear On Mechanism unit
1. Remove Mechanism unit.
-Remove 5 screws that fix Mechanism unit.
-Disconnect some connectors.
-Remove Mechanism unit.
2. Remove Pinch arm unit.
-Unlock the tab of Opener piece and
remove Opener piece.
-Remove Pinch arm unit.
3. Remove Loading motor unit.
Unlock 3 tabs of Loading motor unit and
remove Loading motor unit.
Pinch arm unit 4. Remove Main cam gear.
Remove Snap washer located at the bottom
of Mechanism chassis and remove main cam
gear.
5. Remove Drive rack arm.
Rotate Drive rack arm to the counterclock-
wise and remove Drive rack arm.
Then replace Drive rack arm.
Drive rack arm
* The mechanism phase alignment has to be done.
Adjust the hole of Main cam gear and the penetration hole of Mechanism chassis.
Adjust the hole that sets the position of Loading rack and the penetration hole of mechanism
Chassis.
Remarks
Snap washer is very hard so that take care the disassembly of Snap washer during
removing Main cam gear.
-3-
Phenomenon : Cassette tape can not ejected
Abnormal sound in FF/REW mode
Diagnosis and Disposal
Checking Judgement Disposal
Mis-function of Mechani- The rotation of Centre Replacement of Centre
sm or abnormal sound in clutch unit is heavy clutch unit (VXP1850 or
Mechanism VXP1732) No. of Centre
clutch unit is different
depend on the model No.
Parts location
On Mechanism unit
1. Remove Mechanism unit.
-Remove 5 screws that fix Mechanism unit.
-Disconnect some connectors.
-Remove Mechanism unit.
2. Remove centre clutch located at the bottom
of Mechanism chassis.
-Remove Capstan belt and Washer and
remove centre clutch unit while pressing
conversion lever B to the bottom.
Washer Centre clutch unit After confirming the rotation of Centre
clutch unit individually, replace it.
Conversion gear spring
Conversion gear
Conversion lever B
Remarks
Centre clutch unit failure is thought. When rotate Centre clutch unit individually, the
rotation of Centre clutch unit is uneven.
-4-
Phenomenon : Tape is not running
Abnormal sound in playback mode
Diagnosis and Disposal
Checking Judgement Disposal
Tape running is abnormal Engagement between Replacement of Idler arm
or Abnormal sound in Idler arm unit and Centre unit (VXL2792)
Mechanism unit clutch unit is not so good.
Parts location
Bottom of Mechanism unit On Mechanism unit
1. Remove Mechanism unit.
-Remove 5 screws that fix Mechanism unit.
-Disconnect some connectors.
-Remove Mechanism unit.
2. Remove Centre clutch unit located at the bottom
of Mechanism chassis.
-Remove Capstan belt and Washer.
Washer -Remove Centre clutch unit while pressing
Centre clutch unit Conversion lever B to the bottom.
3. Remove Idler arm unit.
Remove Conversion gear and Conversion gear
spring and remove Idler arm unit.
Idler arm unit
Conversion gear
Conversion gear spring
Conversion lever B
Remarks
Engagement of gear of Idler arm unit is bad.
-5-
Phenomenon : Cassette tape is not inserted / Loading is not done
Diagnosis and Disposal
Checking Judgement Disposal
Loading is not done -Roller post is not fixed Replacement of Take up
-Take up loading arm is loading arm (VXL2670)
out of position
Parts location
On mechanism unit
1. Remove Mechanism unit.
-Remove 5 screws that fix Mechanism unit.
-Disconnect some connectors.
-Remove Mechanism unit.
2. Replacement of Take up loading arm.
-Unlock the tab of Take up loading arm
located at the bottom of Mechanism chassis
and remove Take up loading arm.
-Replace Take up loading arm. When mount
Take up loading arm, the arrow mark
mentioned on the gear of Take up loading
arm has to be adjusted to the gear of
Take up loading arm Supply loading arm.
Tab of Take up loading arm
* The Mechanism phase alignment has to be done.
Adjust the hole of Main cam gear and the penetration hole of Mechanism chassis.
Adjust the hole that sets the position of loading rack and the penetration hole of Mechanism
chassis.
Remarks
The tab of Take up loading arm loosens and Take up loading arm is not fixed to the pin
so that Take up loading arm get out of position.
-6-
Phenomenon : Tape slack (Self-Test Indication Display F05)
Diagnosis and Disposal
Checking Judgement Disposal
Cassette tape is floating Cassette tape is not Replacement of Supply
in cassette down position engaged with Supply reel reel table (VDR0346)
table (Engagement of
cassette tape with Supply
reel table is bad)
(Tape is not wound)
Parts location
On Mechanism unit
1. Remove Mechanism unit.
-Remove 5 screws that fix Mechanism unit.
-Disconnect some connectors.
-Remove Mechanism unit.
2. Remove Cassette holder unit.
Remove Connection spring of Drive gear
and remove 3 red screws and then remove
Cassette holder unit.
3. Remove Tension arm unit and Supply reel
table
Remove Tension spring. Unlock the tab
of Tension arm projection located at the
bottom of Mechanism chassis and remove
Tension band Tension arm unit and Supply reel table.
Supply reel table Then replace Tension arm unit and Supply
Tension Arm unit reel table.
Tension spring
Remarks
The engagement with gear portion of Supply reel table and cassette tape is bad so that
cassette tape is not set to the regular position.
-7-
Phenomenon : Cassette tape can not be ejected
Diagnosis and Disposal
Checking Judgement Disposal
Unloading is not done Release of Tension band Replacement of tension
or deformation of Tension arm (VXL2793)
arm
Parts location
On Mechanism unit
1. Remove Mechanism unit.
-Remove 5 screws that fix mechanism unit.
-Disconnect some connectors.
-Remove Mechanism unit.
2. Remove Cassette holder unit.
Remove Connection spring of Drive gear and
remove 3 red screws.
Then remove Cassette holder unit.
3. Remove Tension arm unit and Supply reel
table.
Remove Tension spring. Unlock the tab of
Tension arm projection located at the bottom
Supply reel table of Mechanism chassis and remove Tension
arm unit and Supply reel table.
Tension arm unit Then replace tension arm unit and Supply
reel table.
Tension spring Tension band
Remarks
Tension band comes off Supply reel table and tape is not wound.
-8-
Phenomenon : Blue back in playback mode
(No picture or noisy picture)
Diagnosis and Disposal
Checking Judgement Disposal
A/C Head condition Clog of A/C Head or Cleaning of A/C Head or
A/C Head failure replacement of A/C Head
(VED0412)
Parts location
A/C Head
1. Remove Top Panel.
Remove 2 screws that locate on both left
and right side of Top Panel and Top Panel.
2. Clean the surface of A/C Head.
3. Replace A/C Head.
Remove 1 screw that fix A/C Head and
replace A/C Head.
* The tape running adjustment has to be done
after replacing A/C Head.
The other phenomenon
- Playback picture is disarranged and playback audio mutes.
- Repeat LP mode and SP mode.
- No function of counter.
Remarks
Since A/C Head is clogged and control signal is not detected, above phenomenon appears.
(Control signal is not detected so that blue back appears.)
-9-
Phenomenon : A tape is not inserted
Noisy picture in REV mode
Diagnosis and Disposal
Checking Judgement Disposal
Cassette tape does not Bend of P5 arm Replacement of P5 arm
move to cassette down (VXL2677)
1. Cassette tape catch in
cassette holder unit
Noisy picture in 2. Tape running is
playback mode unstable.
* The phenomenon varies depend on the degree of the bend of P5 arm.
Example : Noisy picture
Parts location
On Mechanism unit
1. Remove mechanism unit.
-Remove 5 screws that fix Mechanism unit.
-Disconnect some connectors.
-Remove Mechanism unit.
2. Remove Main lever and P5 arm.
Unlock 2 tabs that fix LED prism and
1 tab that fix the projection on Mechanism
chassis while lifting the left side of Main
lever a little and remove Main lever and P5
arm. Then replace Main lever and P5 arm.
Main Lever P5 Arm
* The Mechanism phase alignment has to be done.
Adjust the hole of Main cam gear and the penetration hole of Mechanism chassis.
Adjust the hole that sets the position of Loading rack and the penetration hole of Mechanism
chassis.
Remarks
The plastic portion of P5 arm is broken or P5 arm is bent.
- 10 -
Phenomenon : Tape is not running (Capstan does not rotate)
Self-Test Indication Display F05 or H02
Diagnosis and Disposal
NV-HD670A/EA/BD, HD620A/EA/AM/EU/BD, HD625AM, SD570AM/EU
Checking Judgement Disposal
Cap.R/F (Capstan rotation Confirmation of the voltage Replacement of Capstan
direction control) at pin 7 of for Hole element at pin 9 of unit (VEK8239)
IC0201 in Capstan drive IC0201 and Motor driving The inside of IC0201 is
circuit (Cap.ED/S at pin 10 voltage at pin 22, 24 and 25 broken and IC0201 is being
of IC6001) of IC0201 supplied with Capstan unit
as one unit
NV-SD320AM, SD420A/EA/SA/EU
NV-SD270A/EA/SA, SD225AM/AMJ/EU, SD220AM/AMJ/A/SA, SD210SA
Checking Judgement Disposal
Cap.R/F (Capstan rotation Confirmation of the voltage Replacement of Capstan
direction control) at pin 7 of for Hole element at pin 9 of unit (VEK8024)
IC0201 in Capstan drive IC0201 and Motor driving The inside of IC0201 is
circuit (Cap.ED/S at pin 10 voltage at pin 22, 24 and 25 broken and IC0201 is being
of IC6001) of IC0201 supplied with Capstan unit
as one unit
NV-HD620BR/PM, SD420AR/BR/PM
Checking Judgement Disposal
Cap.R/F (Capstan rotation Confirmation of the voltage Replacement of Capstan
direction control) at pin 7 of for Hole element at pin 9 of unit (VEK8239)
IC0201 in Capstan drive IC0201 and Motor driving The inside of IC0201 is
circuit (Cap.R/F at pin 12 voltage at pin 22, 24 and 25 broken and IC0201 is being
of IC6001) of IC0201 supplied with Capstan unit
as one unit
The other phenomenon
Capstan runs away so that cassette tape can not be ejected or VTR is placed to CUE mode
even though VTR is set in SP playback mode.
- 11 -
Parts location
Bottom of Mechanism
1. Remove Top Panel and Front Panel unit.
-Remove 2 screws located at both left and
right side of Top Panel and Top Panel.
-Remove 7 tabs located at top and bottom of
Front Panel unit and Front Panel unit.
2. Remove Mechanism unit.
-Remove 5 screws that fix Mechanism unit.
-Disconnect some connectors.
-Remove Mechanism unit.
3. Replacement of Capstan unit.
-Unlock the tab of Opener piece and remove
Screws Capstan unit Opener piece. Remove Pinch arm unit.
-Remove 3 screws that mount Capstan unit
Top of Mechanism at the top of Mechanism unit.
Remove 2 screws that mount Capstan unit
at the bottom of Mechanism unit.
Remove Capstan unit and replace capstan
unit.
Concerning more detailed disassembly method,
refer to Service Manual for Z Mechanism
(Order No. VRD9612M129)
Screws Opener piece
Tab of Opener piece
Pinch arm unit
Checking point
The requirement condition to be driven Capstan of IC0201
1. Cap R/F (Capstan rotation direction control) at pin 7 of IC0201 has to be Low voltage.
2. VCC at pin 28 of IC0201 has to be 5V.
3. Motor voltage at pin 19 of IC0201
4. Torque voltage at pin 10 of IC0201
5. Current detection at pin 23 of IC0201
6. Hole element at pin 9 of IC0201
- 12 -
MATSUSHITA ELECTRIC
Printed in Japan
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