Aiwa NC3600 P4LRH Service Manual

NC3600 P4LRH

English

SERVICE MANUAL

VIDEO MECHANISM

S/M Code No. 09-995-333-1N1

DATA

VCR TEST TAPE INTERCHANGEABILITY TABLE

There are two types of the new allgnment tape CH-1B (for NTSC) and CH-2 (for PAL). On each tape four signals (1)-(4)
are recorded for the times and in the order shown below.

(1) : 8min. fi (2) : 2min. fi (3) : 5min. fi (4) : 5min.

The TTV-MP1 (for M-PAL), TTV-MS1 (for MESECAM) and TTV-S1 (for SECAM) allgnment tapes have the same
contents as the previous tapes.

Method

NTSC

Now in use TYPE

Model Contents *1

TTV-N1

TTV-NS1

TTV-N1E

TTV-NS6E

TTV-N2

TTV-N12
(SCV-1998)

TTV-N6
(TTV-N06T)

TTV-N7A

NTSC, Color bar,
1kHz, SP

NTSC, Color bar,
1kHz, SP

NTSC, Color bar,
1kHz, EP

NTSC, Color bar,
No sound, EP

NTSC, Stairsteps,
7kHz, SP

NTSC, Color bar,
1kHz, SP

NTSC, Mono scope,
7kHz, SP

NTSC, Stairsteps,
1kHz, SP, HiFi 400Hz

New TYPE

Model Contents *1

CH-1B(2)

CH-1B(4)
*2

CH-1B(1)

CH-1B(4)

CH-1B(3)

NTSC, Stairsteps,
1kHz, SP

No Changed.

NTSC, Color bar,
1kHz, EP

No Changed.

NTSC, Stairsteps,
7kHz, SP

NTSC, Color bar,
1kHz, EP

No Changed.

NTSC, Color bar,
No sound SP,
HiFi 400Hz

Application

PB-Y Level/General electrical ADJ.
Head ACE Height/Tilt ADJ.

For S-VHS (SQPB) check

Switching position ADJ.

For S-VHS (SQPB) check

Head ACE Azimuth ADJ.

FM Envelope ADJ.
X-V alue ADJ.

For total picture quality check (resolution, etc)

HiFi Audio PB Level ADJ.

Switching position ADJ.
PB-Y Level/General electrical ADJ.
Head ACE Height/Tilt ADJ.

Switching position. (LP Model)
FM Envelope ADJ. (LP Model)
X-Value ADJ. (LP Model)

HEAD ACE Azimuth ADJ.
FM Envelope ADJ. (SP Model)
X-Value ADJ. (SP Model)

For total picture quality check (resolution, etc)

HiFi Audio PB Level ADJ.

FM Filter ADJ.

PAL

TTV-P1

TTV-P1L

TTV-P2

TTV-P6
(TTV-N06T)

TTV-P7

TTV-P16

PAL, Color bar,
1kHz, SP

PAL, Color bar,
1kHz, LP

PAL, Stairsteps,
6kHz, SP

PAL, Monoscope,
6kHz, SP

PAL, Stairsteps,
1kHz, SP,
HiFi 1kHz

PAL, Color bar,
400Hz,
SP, HiFi 1kHz

CH-2(2)
* 3

CH-2(4)

CH-2(1)

CH-2(3)

PAL, Stairsteps,
1kHz, SP

PAL, Color bar,
1kHz, LP

PAL, Stairsteps,
6kHz, SP

No Changed.

PAL, Color bar,
No sound
SP, HiFi400Hz

No Changed.

* 1. Described in the order of color format. video signal. linear audio. tape speed and Hi-Fi audio.
* 2. Use CH-1B (1)-(3) with models used exclusively in the SP mode.
* 3. Use CH-2 (3) and (4) when it is necessary to observe the chroma signal.

2

Top bracket

Cassette holder
assembly

Door open lever

FL cassette
guide assembly

2. MECHANICAL ADJUSTMENT

2-1. LOCATION OF MECHANISM PARTS

Head cleaner

Drum brush

Cylinder
assembly

FE head
S slider

Tension lever

S brake
Band brake

ACE head

No. 8 guide cap

Pinch roller

Loading motor

T slider

No. 9 guide lever

FL cam gear

T brake

T real table

S reel table
FL arm lever

Idle lever assembly

FL drive slider

Center gear
assembly

Fig-2-1-1 Upper side

Fig-2-1-2 Upper side

3

Capstan motor

Worm gear holder

T loading lever
assembly

Worm wheel

Reel belt

Joint gear 1

Joint gear 2
Cam slider

S-VHS switch

Pinch drive lever

2-2. SERVICE TOOL LIST

S loading lever
assembly

Loading drive gear

Tension drive lever

Up/down lever

Holder clutch
assembly

Fig-2-1-3 Rear side

Alignment tape

Torque cassette Post height adjustment screwdriver
(SRK-VHT-103-404) (SV-TG0-030-000)

4

2-3. ALIGNMENT TAPES FOR ADJUSTMENT

Mechanism PAL
Adjustment item SP/LP 2/4 head
FM envelope TTV-P2L

Slant Commercially available tape

A/C head Height TTV-P1 (TTV-P1L)

Azimuth TTV-P2
X value TTV-P2 (TTV-P2L)
RG post slant Commercially available tape
Tape back-tension SRK-VHT-103

2-4. GUIDELINE OF MAJOR PARTS REPLACEMENT

• The replacement periods that are shown below, indicate the guide line only, and are the life of the individual parts.

• The following guideline is compiled on the assumption the mechanism is used under the standard operating conditions
(i.e., normal temperature and normal humidity.) The replacement periods change depending on the operating
environments, method of use and running hours.

• Life of head assembly (cylinder) is especially heavily affected by the operating conditions.

Parts name

Tension post
S/T slant guide post
Impedance roller
Guide post No. 8
Capstan
Guide post No. 9
Guide post No. 3
S/T guide roller

Tape run mechanism

Head assembly
(cylinder)
FE head
ACE head
Pinch roller
Capstan motor
Loading motor
Reel belt
Clutch gear assembly

Drive mechanismOthers

Idle lever assembly
Band brake
Slip ring assembly

500

3

3

3

3

3

3

3

3

1000

3

3

0

3

0

0

3

0

0

0

0

0

1500

3

3

0

3

0

0

3

0

0

0

0

0

Table 2-4-1

Guideline of time

2000

2500

3

3

0

0

0

0

0

0

0

0

0

0

3

3

0

0

0

0

0

0

0

0

0

0

0

0

3000

3

0

0

0

0

0

0

0

0

0

0

0

0

3500

3

0

0

0

0

0

0

0

0

0

0

0

0

4000

3

0

0

0

0

0

0

0

0

0

0

0

0

4500

3

0

0

0

0

0

0

0

0

0

0

0

0

5000

• Cleaning shall be

3

• After cleaning, wait

• Use the specified oil for

0

• When lubricating a part,

0

0

0

0

0

0

0

0

0

0

0

Remarks

performed using a
cotton swab or cotton
cloth moistened with
alcohol.

until the cleaned parts
are dried completely
before using a video
cassette tape.

lubrication.

apply only one or two
drops of oil after
cleaning the part with
alcohol.

3: Cleaning
0: Check the part. Replace when the part needs replacement.

*: Impedance roller is used in some models, but not used in some other models.

5

2-5. MECHANISM CHECK PROCEDURE

Do the loading motor rotate

and the worm wheel rotate

when the main power is

turned on without

inserting a cassette?

Does the FL cam gear

rotate clockwise by approx.

15 degrees and return immediately

when the above operation

is performed?

Does the capstan motor

rotate when the cassette holder

is pressed without inserting

a cassette?

Does the T reel table rotate

when the above operation

is performed?

When a cassette whose record

safety tab is not broken, is inserted,

is the tape remaining amount

displayed and is the tape

stopped at the playback

position?

Motor and sensor systems are OK.

Loading motor has
abnormality.

Tape start sensor has
abnormality.

Capstan motor has
abnormality.

Reel belt and reel system
have abnormality.

When a tape is ejected
even though it is wound up
or when tape is stopped
during unloading, the reel
sensor has abnormality.
When the mechanical
operation is found not
normal, the cam switch
has abnormality.

YES

NO

NO

NO

NO

NO

YES

YES

YES

YES

When a trouble is suspected to be caused by mechanism
from the contents of the defect symptoms, follow the
troubleshooting flow chart as shown, and locate the cause
of trouble by the procedure as shown.

2-5-1. Outside Appearance Check

1) Check if there exists any foreign materials or
not inside the VTR.

2) Check if the cylinder and the guides of the
tape run mechanism are stained or not.

2-5-2. Checking Motor and Sensors

Check if motors and sensors (including the control
circuit) have any abnormalities or not, by
following the flow chart.

2-5-3. Trouble Analysis Using the Service Mode

This model has the service mode. The service
mode provides the function to display the status
when trouble occurs. Use the service mode to
analyze cause of trouble.
Refer to the SERVICE MODE section of the
manual for the procedure to display the data and
for the contents of the service mode.

Fig-2-5-1

6

2-5-4. HOW TO OPERATE THE MECHANISM

(MODE TRANSITION) BY MANUAL
OPERATION

1) Remove the worm gear holder using tweezers
and remove the worm gear.

Note: To check the Review, Stop 2, Fast forward/Rewind

modes, rotate the mechanism I the unloading direction
and stop the mechanism where the above described marks
are aligned, and then check the mechanism.
There can be a case that the stop position of a mechanism
by the cam switch and the position where marks are
aligned, can be different due to play and variation of gear.
When you want to operate a mechanism after cassette
holder is removed, be sure to press down the tension drive
lever as shown in Fig-2-5-4 after the S and T sliders start
moving and until the T slider comes to the AC head
position.

Press it down

Worm gear holder

While pressing down the lock levers R and L of the
cassette holder by hand, rotate the worm wheel in the
clockwise direction. Then the mechanism can enter the
loading modes by manual operation.
When the triangle (3) mark of the FL drive slider and the
triangle (3) mark of the FL cam gear are aligned as
shown in Fig-2-5-3, the mechanism can enter the
following mechanism positions.

I

Power OFF

2

R

Review

2

P

Play

2

S1

Stop 1

2

FL drive slider

Press the craw down

Fig-2-5-2

S2

Stop 2

2

FR1

Fast forward/Rewind 1

2

FR2

Fast forward /Rewind 2

2

FL cam gear

Tweezers

Tension lever

Tension drive lever

Fig-2-5-4

2) On replacement of the defective parts
When a specific part is found defective and needs to
be replaced, note the following points.

• Pay special attention when replacing the mechanical
parts that need phase adjustment.
Pay special attention for the parts installation mode
and phase-alignment marks, and others.

• For the parts that need greasing and lubrication, coat
the parts with proper amount of grease or oil as
specified to the specific point. Be careful so that
grease or oil must not splashed to any other parts.
After greasing or lubrication, install the mechanism
into the product, turn on the main power and confirm
proper operation of the mechanism.

Worm wheel

Fig-2-5-3 Position mark (Play position)

Move the mechanism to the status in which the trouble
has occurred, by manual operation as shown above.
Check status of the mechanism in the status in which the
trouble has occurred.

3) Confirmation after repair work is completed.
When the repair work is completed (especially when
replacement and/or adjustment of mechanical parts
are performed), be sure to confirm operation and
movement of mechanical parts and mechanism
before installing the mechanism back into the
machine. Then turn on the main power and operate
the machine to confirm the correct operation of the
machine.

Note: When any repair work is performed and

mechanical parts are replaced in order to
solve the trouble of “Mechanical parts are
broken or phase-adjustment”, and when the
same (or similar) trouble occurs during the
operation check after the main power is
turned on, the main cause (mechanical or
electrical circuit) of the trouble may exist
in other locations. Please check the other
assemblies and blocks too.

7

2-5-5. How To Eject A Videocassette Manually

Attach an adhesive tape

Attach an adhesive tape

Cassette retainer
block

Cassette retainer
block

Because one of the screws that fix the mechanism
deck to the chassis, is located beneath the cassette,
the mechanism deck cannot be removed while a
videocassette exists inside the mechanism deck.
If a videocassette cannot be ejected even though
the EJECT button is pressed, remove the
videocassette by the following procedure.

1) Remove the work gear holder and the worm
gear by referring to section 2-6-6. Rotate the
worm wheel in the direction of the arrow
(unloading direction, Fig-2-5-5) with a
screwdriver.

2) When the S and T sliders start unloading,
insert a precision (watch) screwdriver into the
long slot on the bottom panel as shown in Fig­2-5-6 so that the loosened tape must not get
oily or must not get greasy. Using the
precision (watch) screwdriver, rotate the
pulley of the clutch gear assembly in the
direction of the arrow when viewed from the
bottom. Rotate the worm wheel to take up the
tape onto a reel table.

Note: • Stand the machine in the upright

position when removing a videocassette
manually as shown in Fig-2-5-6 and as
described in this section in order to
protect a tape.

• If a mechanism is locked and if a
videocassette cannot be ejected when
through the worm wheel is rotated,
remove by breaking the cassette
retainer block as shown in Fig-2-5-7.

2-5-6. How To Check Various Mechanism

Modes without Inserting A Videocassette

1) Attach a blind tapes on the right and left of the
cassette holder so that the sensor light should
not reach the start sensor and to the end
sensor. (Fig-2-5-7.)

2) Release both of the right and left lock levers
of the cassette holder so that the cassette
holder can be moved down and slotted in.

3) When cassette down is performed, rotating
speed of the S reel table increases. If rotation
of the S reel table is stopped, the mechanism
starts loading. (If rotation of the S reel table is
not stopped, eject will be activated.)

4) When loading is completed, rotate with hand
the reel table that is opposite side of the
presently rotating reel table.

5) In this state of mechanism, various modes can
be checked now.

Note: When the reel table that is opposite side of

the rotating reel table is turned by hand
during playback, fast forward/rewind
modes so that the reel pulse should not be
sent, the auto eject is activated or the main
power is turned off.

Front side

Rear side

When viewed form the rear side

FL cam gear

Worm
wheel

Fig-2-5-7

Fig-2-5-5

Pulley

Fig-2-5-6

8

2-6. REPLACING THE MAIN PARTS

Cassette holder assembly

Lock lever

Boss A

Groove C

Groove D

Boss B

FL arm lever

2-6-1. Door Open Lever

1) Rotate the door open lever in the direction of
the arrow, and remove the claw of the door
open lever that has been inserted in the hole
on the left bottom of the right side of the
mechanism deck.
Then remove the door open lever from the
door open lever shaft and for the door open
lever guide by raising the door open lever.

Door open lever guide

Door open lever shaft

Door open
lever

Claw

FL cassette

guide assembly
Write-protection lever
(Playback only machines
do not have the write­protection lever)

4) Replace the FL cassette guide assembly with
the new FL cassette guide assembly.

5) After the FL cassette guide assembly is
replaced, assemble the mechanism by
reversing the disassembling procedure.

Lock lever

Guide groove

Worm wheel

Claw

Fig-2-6-2

Claw

Fig-2-6-1

2) Replace the door open lever with a new door
open lever.

3) After the door open lever is replaced,
assemble the mechanism by reversing the
disassembling procedure.

Note: Attach the door open lever in a manner so

that it is located inside the guide.

2-6-2. FL Cassette Guide Assembly

1) Remove the door open lever. (Refer to 2-6-1.)

2) Press the lock levers that are located on both
sides of the cassette holder assembly and
release the lock. Move the cassette holder
assembly until it reaches the vertical shift
position of the guide groove. Remove the
lamp board in the case that your machine has a
lamp board.

Note: When the cassette holder assembly is

cannot be moved smoothly, rotate the
worm wheel clockwise.

2-6-3. Cassette Holder Assembly

1) Remove the door open lever. (Refer to 2-6-1.)

2) Remove the FL cassette guide assembly.
(Refer to Section 2-6-2.)

3) Move the cassette holder assembly to the
front.

4) Remove the cassette holder assembly from the
right side of the mechanism deck as follows:
Pull the right side of the cassette holder
assembly to the front so that the two bosses A
and B on the right side of the cassette holder
assembly, can be removed from the grooves C
and D of the mechanism deck. Then, while
releasing the lock lever in the right, raise the
cassette holder assembly obliquely and
remove the cassette holder assembly from the
right side of the mechanism deck.

3) While pressing in the craws on the both sides
of the FL cassette guide assembly inside,
remove the FL cassette assembly by raising it
up.

Fig-2-6-3

9

5) Replace the cassette holder assembly with the
new cassette holder assembly.

6) After the cassette holder assembly is replaced,
assemble the mechanism by reversing the
disassembling procedure.

Boss of mechanism
deck

Worm wheel

FL cam gear

Note: Attach the cassette holder assembly while

releasing the lock lever.

2-6-4. FL Arm Lever

1) Remove the door open lever. (Refer to section
2-6-1.)

2) Remove the FL cassette guide assembly.
(Refer to section 2-6-2.)

3) Remove the cassette holder assembly.
(Refer to section 2-6-3.)

4) Remove the FL arm lever as follows: Pull the
left claw of the FL arm lever in the direction
of the arrow A, and remove the FL arm lever
from the boss of the mechanism deck. Pull
the FL arm lever from its left side to the front
and remove the FL arm lever.

Claw

Boss of mechanism
deck

Joint gear metal bracket

6) Turn the mechanism deck upside down.

7) Remove one screw from the joint gear metal
bracket, and remove the joint gear metal
bracket.

8) Remove the joint gear 2.

Screw

Joint gear 1

Boss hole

Screw

FL drive slider

Fig-2-6-5

Joint gear metal bracket

Boss hole

FL arm lever

FL drive slider

Boss

Fig-2-6-4

5) Replace the FL arm lever with a new FL arm
lever.

6) After the FL arm lever is replaced, assemble
the mechanism by reversing the disassembling
procedure.

Note: Attach the FL arm lever so that boss of the

FL arm lever enters into the groove of the
FL driver slider.

2-6-5. FL Drive Slider, Joint Gear 2, FL Cam

Gear and Joint Gear 1

1) Remove the door open lever. (Refer to section
2-6-1.)

2) Remove the FL cassette assembly. (Refer to
section 2-6-2.)

3) Remove the cassette holder assembly. (Refer
to section 2-6-3.)

4) Remove the FL arm lever. (Refer to section 2­6-4.)

5) Remove the FL drive slider.
Remove the FL drive slider as follows: Slide
the FL drive slider slightly to the front in order
so that the boss of the mechanism deck is
aligned to the portion where the slider groove
becomes wider (boss hole). Pull the FL drive
slider from the boss and remove the FL slider.

Joint gear 2

Fig-2-6-6

9) Remove the FL cam gear.

10) Remove the joint gear 1.

11) Replace the parts with the new parts.
Coat the following area of the new parts with
grease. (Refer to Fig-2-6-7 to Fig-2-6-11.)

The shaded portion should
be coated with grease

Fig-2-6-7 FL drive slider (Super-V dash mechanism)

10

The shaded portion should
be coated with grease

13) Attach the FL cam gear so that the marking on
the FL cam gear is aligned to the center of the
worm wheel.

FL cam gear

Marking

Fig-2-6-8 Joint gear 1

Two holes

The shaded portion should
be coated with grease

Fig-2-6-9 FL cam gear (Playback only machines)

12) To attach the joint gear 1, attach it so that cut­out of the gear is directed toward the FL cam
gear.

Worm wheel

Fig-2-6-11

14) To attach the joint gear 2, align the marking
on the joint gear 1 with that on the cam slider.

Joint gear 1

Align the markings

Align the markings

Joint gear 2

Cam slider

Fig-2-6-12

Cut-out of the gear

15) After parts are replaced, assemble the
mechanism by reversing the disassembling
procedure.

Joint gear 1

Fig-2-6-10

11