DOWNLOAD Panasonic AG-TL750E / AG-TL750B Service Manual ↓ Size: 11.71 MB | Pages: 90 in PDF or view online for FREE

2-1

(1) When using the soldering iron, be sure to disconnect the

power cord of the main unit from the AC outlet beforehand.

(2) Pay attention not to damage the wires when connecting/

disconnecting the connectors.

(3) Do not touch the parts around the adjustment point because

of wrongly specifying the defective point.

(4) Pay special attention not to injure claws, etc. by accident

during the repair operation.

(5) When mounting the cassette housing assembly, set the unit

exclusively to the mechanism assembly position.  (Refer to
Section 2.3.2.)

(6) When remove any slit washers, replace them new one.

When the unit malfunctions with the cassette tape being left
loaded and the cassette tape cannot be ejected, remove the
cassette tape in the following manner:
(1) Be sure to disconnected the power cord and remove the

top cover.

(2) For unloading, rotate the loading motor in the main deck

assembly manually toward you.  At this time, unload the
tape by rotating the capstan motor clockwise and winding
the tape so that the grease does not come into contact with
the slackened tape.

(3) When the tape comes to the position where the pole base

assemblies (supply side, take–up side) and guide arm as-
sembly are hidden by the cassette shell, stop rotating the
capstan motor, and check that the tape is fully wound up.

(4) When the capstan motor is further rotated counterclockwise,

the cassette housing is ejected, then the cassette tape may
be removed.

Loading motor

Guide arm assembly

Poll base assembly

Capstan motor

Alignment tape (SP)

VFK1741

Alignment tape

VFK1742

Cassette torque meter

VFK1744

A/C head position bit

VFK1745

Roller driver

VFK1746

Grease

VFK1748 / VFK1749 / VFK1750

Oil

VFK1751

Parallel check plate (0.05)

VFK1747

• Interchangeability adjustment
• PB switching point adjustment.

6 kHz

VHS SP
Stairstep

Video Signal

Audio Signal

Applications

• X-value adjustment

6 kHz

VHS SP
Stairstep
(1 field per 5 frame does not contain video and audio)

Video Signal

Audio Signal

Applications

2-2

Control cam

Lever assembly

Guide arm assembly

Pinch roller arm assembly

A/C head

Cleaner roller
assembly

Upper drum assembly

Inertia plate
Inertia roller

Guide rail

Control plate

Tension arm assembly

Tension band assembly

Reel disk (S)
Slit disk (S)

Slide plate

Reel disk (T)
Slit disk (T)

Full erase head

Guide roller (S)
Guide flange (S)

Pole base assembly (S)

Clutch unit (S)

Idler arm 
assembly

Clutch unit (T)

Brush assembly

Capstan motor

Guide roller (T)
Guide flange (T)

Loading motor

Motor pulley

Belt (Loading)

Pole base 
assembly (T)

Belt (Capstan)

Rotary encoder

Worm gear 
assembly

Capstan motor

Capstan brake arm 
assembly

Rotor assembly
Stator assembly
Drum assembly

Belt (Housing) 

Pulley assembly

2-3

This reference chart is based on the following status (see notes*
below) and the service life (maintenance interval) may greatly
differ depending on the environmental or using conditions.  If
the maintenance check is not performed correctly, the service

life shown in the following chart will be greatly reduced and it
could affect the other units.  However, it is recommended that
rubber parts are replaced every three years as these could be
affected by aging.

*Notes:
  • Maintenance period is calculated assuming that the unit is continuously used in the 12H recording mode.

For this reason, maintenance must be performed at a shorter interval than above when the unit is used in an operation condition in
which the mode is frequently changed (such as VHS recording mode or Sensor REC mode).

  • Read the drum hour meter for an indication of the service life (maintenance interval).

every 4000 hours every 8000 hours

every 500 hours

Part Name

Symbol No. of Part

and it appears in

Standard Service Period (Operation Hours)

Remarks

: Cleaning        : Check and replacement if required        Replacement

: Lubrication to the shaft

Other

Drive system

Tape transport system

Cate-
gory

 1

TAPE TRANSPORT PART

 2

GUIDE FLANGE (S, T)

 3

FULL ERASE HEAD

 4

POLE BASE ASSEMBLY (S)

 5

POLE BASE ASSEMBLY (T)

 6

A/C HEAD ASSEMBLY

 7

CAPSTAN SHAFT

 8

PINCH ROLLER ARM ASSEMBLY

 9

GUIDE ARM ASSEMBLY

10

UPPER DRUM ASSEMBLY

11

DRUM ASSEMBLY

12

CAPSTAN MOTOR

13

TENSION BAND ASSEMBLY

14

CLUTCH UNIT (S)

15

CLUTCH UNIT (T)

16

BELT

17

MAIN BRAKE (S) ASSEMBLY

18

MAIN BRAKE (T) ASSEMBLY

19

SUB BRAKE (S) ASSEMBLY

20

SUB BRAKE (T) ASSEMBLY

21

CAPSTAN BRAKE ARM ASSEMBLY

22

IDLER ARM ASSEMBLY

23

REEL DISK (S)

(SPACER)

24

REEL DISK (T)

25

SLIT DISK (S)

26

SLIT DISK (T)

27

WORM GEAR ASSEMBLY

28

CONTROL CAM

29

PULLEY ASSEMBLY

30

CONTROL PALTE

31

SLIDE PLATE

32

LOADING ARM ASSEMBLY (S)

33

LOADING ARM ASSEMBLY (T)

34

LOADING MOTOR

35

MOTOR PULLEY

36

BRUSH ASSEMBLY

37

CLEANER ROLLER ASSEMBLY

38

ROTARY ENCODER

39

CASSETTE HOUSING ASSEMBLY

   –

2.3.19

2.3.11

2.3.18

2.3.18

2.3.12

   –

2.3.6

2.3.20

2.3.3

2.3.9

2.3.8

2.3.7

2.3.10

2.3.10

2.3.13/2.3.14

2.3.23

2.3.23

2.3.17

2.3.16

2.3.8

2.3.15

2.3.10/16000h replacement

2.3.10/16000h replacement

2.3.24/16000h replacement

2.3.24/16000h replacement

2.3.27/16000h replacement

2.3.22/16000h replacement

2.3.26/16000h replacement

2.3.10

2.3.23

2.3.25

2.3.25

2.3.21

2.3.21

2.3.4

2.3.5

2.3.22/16000h replacement

1.1

       – 

-26

-82

-112

-113

-108

       –

-107

-106

-6B

-6

-72

-89

-104

-105

-38, 70, 78

-91

-93

-92

-94

-123

-103

-95, 96, 97, 

98

-99, 100, 101

-35

-36

-122

-51

-102

-52

-65

-114

-115

-118

-119

-12

-8

-84

-52

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 4

M 2

   
   

    

   
   
   

2-4

Periodical cleaning of the tape transport system is desirable.
Therefore, perform cleaning when a set is brought in for repairs
or maintenance.  Contamination of the video heads, tape guides
and brush can reduce playback picture quality and in extreme
cases, even damage the tape.
(1) To clean the video heads, press a quality moistened paper

gently against the upper drum with fingertip and turn the
drum counterclockwise by hand.

(2) For cleaning of the tape transport mechanism parts other

than the upper drum, use a close weave cloth or cotton swab
dipped in alcohol.

(3) After cleaning, be sure to check that the cleaned points are

completely dry before loading the video tape.

It is not necessary to periodically lubricate oil or grease, apply
lubrication to the new parts only when replacing them.  If there
is oil or grease at points which come into contact with the re-
placed parts, wipe it off and lubricate again.
(1) For the points where oil or grease is to be applied, refer to

the mechanism assembly exploded view diagram 

M 4 .  For

oil/grease to be used, refer to Table 2-2-2.

Classification

Name

Part No.

Symbol in

Exploded View

Grease Mal Temp SH-P    VFK1748      AA

Grease Dry Surf VFK1749 CC

Grease Fuloil GB-TS-1       VFK1750         DD

Oil Cosmo Hydro HV56

VFK1751 

                BB

(2) Grease is not required for a replacement cassette housing

assembly, as this has been applied at the factory.

This locates the mechanism assembly positions where parts
removal and reassembling are performed.

Remove the cassette housing assembly (refer to Section 1.1
“DISASSEMBLY OF MAJOR  PARTS”), and rotate the mode
motor so that the control cam positioning hole comes to the
chassis hole on the main deck assembly.  In this status, the unit
is set at the mechanism assembly position.

1

(1) Remove the screw 

1

 and remove the brush assembly.

(2) Remove the inertia roller and the inertia plate.
(3) Remove the two screws 

2

 and remove the upper drum

assembly.

Positioning hole

Control cam

Inertia roller

Brush 
assembly

Upper drum assembly

Flywheel

Hole “B”

Hole “A”

1

2