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6-5

< Table 6-2 >

TDV-533

“ENV”

Ass’y Deck - Top Side

Chapter 14

Flat Waveform

(DVD Main PCB - Top Side)

(See Fig. 6-4)

(P/N: J-6090-135-A)

(See Fig. 6-3)

Fig. 6-4 Ass’y Deck (Top Side)

6-6

Needed to minimize the variations in Skew of the Pickup unit and to provide optimum match with the recorded signal on the Disc.

1) Connect an Oscilloscope to the “ENV” Test Point (See Fig. 6-3).
2) Connect Power, Open the Tray and Play CH. 14 which is in the TDV-533 Disc.

 ◆ Set the Oscilloscope Range as follows :

(Voltage ; 50mV/Div.,  Frequency ; 10m Sec.)

3) Adjust the Screws “A” and “B” (See Fig. 6-4) using a Hex screwdriver until you obtain a Flat Waveform and the picture is stable.

Then, go to Chapter 1 and make sure the Waveform is Flat here as well.
If not, you have to go back to Chapter 14 and adjust again.
If you cannot obtain a Flat waveform, then the unit is defective.

: The Deck must be in a horizontal position. Use both “A” and “B” screws to adjust.

Fig. 6-5 Envelope Waveform

Typical Waveform before Adjustment

Waveform after Correct Adjustment

6-7

The tape transport system has been adjusted precisely in the factory. Alignment is not necessary except for the
following :
1) Noise observed on the screen.
2) Tape damage.
3) Parts replacement in the tape transport system.

Lower flange height of tape guide is used as the reference for the transport adjustment.
To maintain the height of the tape guide and prevent damage, do not apply excessive force onto the main base.

Fig. 6-7 Tape Travel Diagram

CYLINDER ASS'Y

TAKE UP REEL DISK

#8 GUIDE POST

#9 GUIDE POST

SUPPLY REEL DISK

CAPSTAN

PINCH ROLLER

GUIDE ROLLER "T"

GUIDE ROLLER "S"

FULL ERASE HEAD

#3 GUIDE POST

TENSION POST

HEIGHT SCREW

TILT SCREW

X - POSITION

ADJUST SILT

AZIMUTH SCREW

POST TENSION

MAIN BASE

FE HEAD

CYLINDER ASS'Y

PINCH ROLLER

GUIDE ROLLER "S"

GUIDE ROLLER "T"

#8 GUIDE POST #9 GUIDE POST

CAPSTAN SHAFT

ACE HEAD

#3 GUIDE POST

Fig. 6-6 Location of Tape Transport Adjustment

6-8

When parts are replaced, perform the required adjustments by referring to procedures for the tape transport
system. If there are any changes to the tape path, first run a T-120 tape and make sure excessive tape wrinkle does not occur at the tape guides.

◆ If tape wrinkle is observed at the guide roller S, T, turn the guide roller S, T until wrinkle disappears.
◆ If the tape wrinkle is still observed at the tape guide, perform the tilt adjustment of the ACE head.

a.  ACE HEAD HEIGHT ADJUSTMENT

1) Run the alignment tape (Color bar) in the playback mode.
2) Observe surface of the audio head using a dental mirror.
3) Turn screw (C) clockwise or counterclockwise until the gap of lower tape edge and the lower edge of the control head is about 0.25mm. (Refer

to Fig. 6-8 and 6-9)

Fig. 6-8 Location of ACE Head Adjustment Screw

SCREW (A)

TLIT ADJUST

X-POSITION

ADJUSTING SLIT

SCREW (C)
HEIGHT ADJUST

SCREW (D)
X-POSITION LOCKING

SCREW (B)

AZIMUTH ADJUST

0  ~ 0 .25  mm 

AUDIO HEAD

VIDEO HEAD

CONTROL HEAD

Fig. 6-9 ACE Head Height Adjustment