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41

1) After completing Step 5-1.(Preliminary Adjustment), check

that the tape passes around the Take-up Guide and Pinch
Roller without folding or curling at the top or bottom.

(1) If folding or curling is observed at the bottom of the

Take-up Guide then slowly turn the Tilt Adjustment
Screw(C) in the clockwise direction.

(2) If folding or curling is observed at the top of it then

slowly turn the Tilt Adjustment Screw(C) in the
counterclockwise direction.

Check the RF envelope after adjusting the A/C Head, if the
RF waveform differs from Fig. C-5-4, performs Precise
Adjustment to flat the RF waveform.

• Oscilloscope
• Alignment Tape(SP)
• Screw Driver(+) Type 5mm

• Audio output jack

• Play an Alignment Tape

1kHz, 7kHz Sections

• Azimuth Adjustment Screw(A)
• Height Adjustment Screw(B)

1) Connect the probe of the oscilloscope to Audio Output

Jack.

2) Alternately adjust the Azimuth Adjustment Screw(A) and

the Tilt Adjustment Screw(C) for maximum output of the
1kHz and 7kHz segments, while maintaining the flattest
envelope differential between the two frequencies.

• Oscilloscope
• Alignment Tape(SP only)
• Screw Driver(+) Type 5mm

• CH-1: PB RF Envelope
• CH-2: NTSC: SW 30Hz

PAL: SW 25Hz

• Head Switching Output

Test Point

• RF Envelope Output Test

Point

• Play an Alignment Tape

1) Release the Automatic Tracking to run long enough for

tracking to complete it’s cycle.

2) Loosen the Fixed Mounting Screw and move the Base

Assembly A/C Head in the direction as shown in the dia-
gram to find the center of the peak that allows for the max-
imum waveform envelope.
This method should allow the 31

µ

m Head to be centrally

located over the 58

µ

m tape track.

3) Tighten the Base Assembly A/C Head mounting Screw.

CH-1 CH-2

42

• T-160 Tape
• T-120 Tape

• Be sure there is no tape jamming or curling at

the begining, middle or end of the tape.

• Run the CUE, REV, Play mode at the

beginning and the end of the tape.

1) Confirm that the tape runs smoothly around the roller

guides, Drum and A/C Head Assemblies while abruptly
changing operating modes from Play to CUE or REV.
This is to be checked at the begining, middle and end
sections of the tape.

2) Confirm that the tape passes over the A/C Head

Assembly as indicated by proper audio reproduction and
proper tape counter performance.

• Oscilloscope
• Alignment Tapes
• Blank Tape
• Post Height Adjusting Driver
• Screw Driver(+) Type 5mm

• CH-1: PB RF Envelope
• CH-2: NTSC: SW 30Hz

PAL: SW 25Hz

• Head Switching Output

Test Point

• RF Envelope Output Test Point

• Play the Blank Tape
• Play an Alignment Tape

• Guide Roller Precise

Adjustment

• Switching Point
• Tracking Preset
• X-Value

Play a blank tape and check for tape curling or creasing around
the Roller Guide. If there is a problem then follow the procedure
4. "Guide Roller Height" and 5. "Audio Control(A/C) Head
Adjustment".

≤

• Oscilloscope
• Alignment Tapes(with 6H

3KHz Color Bar Signal)

• Stop Watch

• RF Locking Time: Less than 5

sec.

• Audio Locking Time:Less than 

10sec

• CH-1: PB RF Envelope
• CH-2: Audio Output
• RF Envelope Output Point
• Audio Output Jack

• Play an Alignment Tape

(with 6H 3kHz Color Bar 
Signal)

Play an Alignment Tape then change the operating mode to
CUE or REV and confirm if the unit meets the above listed
specifications.

1) CUE is the forward search mode (FF)
2) REV is the backward search mode (REW)
3) Refer to the Play mede

CH1 CH2

≤

≤≤

43

The following faults can be remedied by cleaning and oil-
ing. Check the needed lubrication and the conditions of
cleanliness in the unit.
Check with the customer to find out how often the unit is
used, and then determine that the unit is ready for inspec-
tion and maintenance. Check the following parts.

Color beats

Dirt on Full-Erase Head

a

Poor S/N, no color

Dirt on Video Head

Vertical or
Horizontal jitter

Dirt on Audio/Control Head

Dirt on Pinch Roller

If locations marked with 

a

do not operate normally after

cleaning, check for wear and replace.
See the EXPLODED VIEWS at the end of this manual as
well as the above illustrations and see the Greasing (Page
45, 46) for the sections to be lubricated and greased.

a

a

a

a

Dirt on Video Head

Dirt on tape transport system

Low volume,

Sound distorted

Tape does not run.

Tape is slack

a

In Review and
Unloading (off mode),
the tape is rolled up
loosely.

Clutch Assembly D35
torque reduced

Cleaning Drum and
transport system

Fig. C-9-3

F/E Head

Video Head

A/C Head

Pinch Roller

Belt Capston

Clutch

Assembly D35

44

The recording density of a VCR(VCP) is much higher than
that of an audio tape recorder. VCR(VCP) components must
be very precise, at tolerances of 1/1000mm, to ensure com-
patibility with the other VCRs. If any of these components are
worn or dirty, the symptoms will be the same as if the part is
defective. To ensure a good picture, periodic inspection and
maintenance, including replacement of worn out parts and
lubrication, is necessary.

Schedules for maintenance and inspection are not fixed
because they vary greatly according to the way in which the
customer uses the VCR(VCP), and the environment in which
the VCR(VCP) is used.
But, in general home use, a good picture will be maintained
if inspection and maintenance is made every 1,000 hours.
The table below shows the relation between time used and
inspection period.

(1) Grease : Kanto G-311G (Blue) or equivalent
(2) Isopropyl Alcohol or equivalent
(3) Cleaning Patches
(4) Grease : Kanto G-381(Yellow) 

(1) Cleaning video head

First use a cleaning tape. If the dirt on the head is too
stubborn to remove by tape, use the cleaning patch. Coat
the cleaning patch with Isopropyl Alcohol. Touch the
cleaning patch to the head tip and gently turn the
head(rotating cylinder) right and left.
(Do not move the cleaning patch vertically. Make sure
that only the buckskin on the cleaning patch comes into
contact with the head. Otherwise, the head may be dam-
aged.)
Thoroughly dry the head. Then run the test tape. If lso-
propyl Alcohol remains on the video head, the tape may
be damaged when it comes into contact with the head
surface.

(2) Clean the tape transport system and drive system, etc, by

wiping with a cleaning patch wetted with Isopropyl
Alcohol.

1

It is the tape transport system which comes into contact
with the running tape. The drive system consists of those
parts which moves the tape.

2

Make sure that during cleaning you do not touch the tape
transport system with excessive force that would cause
deformation or damage to the system.