SAMSUNG SV-DVD40B, SV-DVD55 Service Manual Alignment & Adjustment

Samsung Electronics

2-1

2. Alignment and Adjustments

2-1 VCR Adjustment

1) X-Point (Tracking center) adjustment, “Head switching adjustment” and “NVRAM option setting” can be adjusted with remote control.

2) When replacing the Main PCB Micom (IC601) and NVRAM (IC605 ; EEPROM) be sure to adjust the “Head switching adjustment” and
“NVRAM option setting”.

3) When replacing the cylinder ass’y, be sure to adjust the “X-Point” and “Head switching adjustment”.

4) How to adjustment.

- Intermittently short-circuit the Test Point on Main PCB with pincers to the adjustment mode.

- If the corresponding adjustment button is pressed, the adjustment is performed automatically.

- If the adjustment is completrd, be sure to turn the power off.

2-1-1(a) Location of adjustment button of remote control

Fig. 2-1

OPEN/CLOSE

STANDBY/ON

OK

X-Point (Tracking Center) Adjustment ;

Head Switching Adjustment ;

NVRAM Option Setting ;

2-1-1 Reference

2-2

Alignment and Adjustments

Samsung Electronics

2-1-1(b) TEST location for adjustment mode setting

Fig. 2-2 Main PCB (Top View)

Short-Circuit for few seconds and release.

(Just one time)

Alignment and Adjustments

2-3

Samsung Electronics

2-1-2 Head Switching Point Adjustment

1) Playback the alignment tape.

2) Intermittently short-circuit the two Test Points on Main PCB while setting the adjustment mode. (See Fig. 2-2)

3) Press the “1, 0” buttons; remote control adjustment operates automatically. (See Fig. 2-1)

2-1-3 NVRAM Option Setting

1) Intermittently short-circuit the two Test Points on Main PCB. (See Fig. 2-2)

2)

Press the “1, 4” buttons on the remote control. The option setting is appears. (See Fig. 2-3)

3)

Select the option number (See table 2-1) of corresponding model with “ , , , ” buttons on the
remote control.

4) After selecting the option number is completed, press the “ ” button of remote control.
(If “ ” button is pressed, the selected number is changescolor. ; See Fig. 2-4)

5) Press the “ENTER” button of remote control again to store the option number.

6) Turn the Power off.

1) NVRAM Option is adjusted in the factory.

2) In case Main PCB Micom (IC601) and NVRAM (IC605 ; EEPROM) are replaced, be sure to set the corresponding option number of the
required model. (If the option is not set, the unit will operate.)

<Table 2-1 NVRAM Option Table>

CNG : OK SAVE : RETURN

01 02 03 04 05 06 07 08
09 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56
57 58 59 60 61 62 63 64
65 66 67 68 69 70 71 72

Fig. 2-3

MODELS OPTION NUMBERS

SV-DVD55/XEF 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 20, 21, 26, 32, 33, 34, 35, 36, 38, 40, 45, 47, 61, 63, 65, 69

SV-DVD55/XEU 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 27, 32, 34, 38, 40, 41, 45, 47, 61, 63, 65, 69

SV-DVD55/XEUI 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 25, 26, 32, 34, 38, 40, 43, 45, 47, 61, 63, 65, 69

SV-DVD55/XEG, XET 2, 4, 5, 6, 7, 9, 10, 11, 12, 13, 15, 32, 34, 36, 38, 40, 42, 45, 47, 61, 63, 65, 69, 72

SV-DVD55/XEC, XEE, XEN 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 32, 34, 36, 38, 40, 42, 45, 47, 61, 63, 65, 69, 72

SV-DVD55/XEB 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 20, 21, 26, 32, 33, 34, 35, 36, 38, 40, 42, 45, 47, 61, 63, 65, 69, 72

SV-DVD55/EUR, XEO 2, 4, 6, 7, 8, 9, 10, 11, 12, 13, 15, 20, 32, 33, 34, 36, 38, 42, 45, 47, 61, 63, 65, 69, 72

SV-DVD55/XEV 2, 6, 7, 8, 9, 10, 11, 12, 13, 15, 20, 21, 32, 33, 34, 36, 37, 39, 42, 45, 47, 54, 61, 63, 65, 69, 70

SV-DVD40/XEF 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 20, 21, 26, 33, 34, 35, 36, 38, 40, 45, 47, 61, 63, 65, 69

SV-DVD40/XEU 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 27, 34, 38, 40, 41, 45, 47, 61, 63, 65, 69

SV-DVD40/XEUI 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 25, 26, 34, 38, 40, 43, 45, 47, 61, 63, 65, 69

SV-DVD40/XEG, XET 4, 5, 6, 7, 9, 10, 11, 12, 13, 15, 34, 36, 38, 40, 42, 45, 47, 61, 63, 65, 69, 72

SV-DVD40/XEC, XEE, XEN 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 34, 36, 38, 40, 42, 45, 47, 61, 63, 65, 69, 72

SV-DVD40/XEB 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 20, 21, 26, 33, 34, 35, 36, 38, 40, 42, 45, 47, 61, 63, 65, 69, 72

SV-DVD40/EUR, XEO 4, 6, 7, 8, 9, 10, 11, 12, 13, 15, 20, 33, 34, 36, 38, 42, 45, 47, 61, 63, 65, 69, 72

SV-DVD40/XEV 6, 7, 8, 9, 10, 11, 12, 13, 15, 20, 21, 33, 34, 36, 37, 39, 42, 45, 47, 54, 61, 63, 65, 69, 70

Fig. 2-4

01 02 03 04 05 06 07 08
09 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56
57 58 59 60 61 62 63 64
65 66 67 68 69 70 71 72

PLEASE WAIT

2-4

Alignment and Adjustments

Samsung Electronics

2-2 DVD Adjustment

2-2-1 Location of Test Point

Fig. 2-5 Location of test Point (Main PCB - Top Side)

RIC1

RIC1

Alignment and Adjustments

2-5

Samsung Electronics

2-2-2(a) Adjustment Spec. and Test Point

2-2-2 Skew Adjustment

Test Disc Adjustment Spec. Test Point Adjustment Location

TDV-533 “ENV” Ass’y Deck - Top Side

Chapter 14 Flat Waveform (DVD Main PCB - Top Side) (See Fig. 2-6)

(See Fig. 2-5)

Fig. 2-6 Ass’y Deck (Top Side)

◆ Test Disc ; Service not Available

<Table 2-2>

2-6

Alignment and Adjustments

Samsung Electronics

2-2-2(b) SKEW Adjustment Method

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. 2-5).

2) Connect Power, Open the Tray and Play the TDV-533 Disc, Chapter 14.

◆ Set the Oscilloscope Range as follows :
(Voltage ; 50mV/Div., Frequency ; 10m Sec.)

3) Adjust the Screws “A” and “B” (See Fig. 2-6) 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.

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

    



     

Typical Waveform before Adjustment Waveform after Correct Adjustment

Fig. 2-7 Envelope Waveform

2-3 VCR Mechanical Adjustment

2-3-1 Tape Transport System and Adjustment Locations

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. 2-8 Location of Tape Transport Adjustment

Fig. 2-9 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

Alignment and Adjustments

2-7

Samsung Electronics

2-8

Alignment and Adjustments

Samsung Electronics

2-3-2 Tape Transport System Adjustment

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.

(1) ACE Head Assembly Adjustment

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. 2-10 and 2-11)

Fig. 2-10 Location of ACE Head Adjustment Screw

Fig. 2-11 ACE Head Height Adjustment

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

Alignment and Adjustments

2-9

Samsung Electronics

b. ACE HEAD TILT ADJUSTMENT

1) Playback a blank tape and observe the position of the tape at the lower flange of tape guide.

2) Confirm that there is no curl or wrinkle at the lower flange of tape guide as shown in Fig. 2-12 (B).

3) If a curl or wrinkle of the tape occurs, slightly

turn the screw (A) tilt adjust on the ACE head ass’y.

4) Reconfirm the ACE head height.

Fig. 2-12 Tape Guide Check

c. AUDIO AZIMUTH ADJUSTMENT

1) Load alignment tape (Mono scope) and playback the 7KHz signal.

2) Connect channel-1 scope probe to audio output.

3) Adjust screw (B) to achieve maximum audio level. (See Fig. 2-10)

(A) (B)

(BAD)

WRINKLE

(GOOD)

2-10

Alignment and Adjustments

Samsung Electronics

d. ACE HEAD POSITION (X-POINT) ADJUSTMENT

1) Playback the alignment tape (Color bar)

2) Intermittently short-circuit the two Test Points on Main PCB. (See Fig. 2-2)

3) Press the “0, 5” remote control buttons, then adjustment is operates automatically. (See Fig. 2-1)

4) Connect the CH-1 probe to “Envelope” the CH-2 probe to “H’D switching pulse” and then trigger to CH-1.

5) Insert the (-) driver into the X-Point adjustment hole and adjust it so that envelope waveform is maximum.

Test point : TP2 (Audio Output)

TP3 (Envelope)
TP4 (H’D S/W -Trigger)
TP5 (Control Pulse)

Fig. 2-13 Location of Test point (Main PCB-Top View)

AUDIO OUTPUT

CONTROL PULSE

HEAD SWITCHING

ENVELOPE

(2) Linearity adjustment (Guide roller S, T adjustment)

1)

Playback the Mono Scope alignment tape (SP mode).

2) Observe the video envelope signal on an oscilloscope (triggered by the video switching pulse).

3) Make sure the video envelope waveform (at its minimum) meets the specification shown in Fig. 2-14.
If it does not, adjust as follows :

Note :

a=Maximum output of the video RF envelope.
b=Minimum output of the video RF envelope at the entrance side.
c=Minimum output of the video RF envelope at the center point.
d=Maximum output of the video RF envelope at the exit side.

4) If the section A in Fig. 2-15 does not meet the specification, adjust the guide roller S up or down.

5) If the section B in Fig. 2-15 does not meet the specification, adjust the guide roller T up or down.

Fig. 2-14 Envelope Waveform Adjustment

a

a b c d
c,b,d/a

63%

b

c

d

Fig. 2-15 Adjustment Points

AB

A B

H'D SWITCHING PULSE

ENVELOPE

Alignment and Adjustments

2-11

Samsung Electronics

2-12

Alignment and Adjustments

Samsung Electronics

6) Play back the Mono Scope alignment tape (SP mode).

7) Connect an oscilloscope CH-1 to the “Envelope” and CH-2 to the “H’D SW Pulse” for triggering.

8)

Turn the guide roller heads with a flat head ( ) driver to obtain a flat video RF envelope as shown in Fig. 2-16.

Fig. 2-16 Guide Roller S, T Height Adjustment

IDEAL ENVELOPE

S HEIGHT TOO HIGH

S HEIGHT TOO LOW

T HEIGHT TOO HIGH

T HEIGHT TOO LOW

GUIDE ROLLER S

GUIDE ROLLER T

(3) Check Transitional Operation from RPS to Play

Check transition from RPS mode to play mode : Using a pre-recorded SP tape, make sure the entry side of enve­lope comes to an appropriate steady state within 3 seconds (as shown in Fig. 2-17).
If the envelope waveform does not reach specified peak-to peak amplitude within 3 seconds, adjust as follows :

1) Make sure there is no gap between the supply roller lower flange and the tape.
If there is a gap, adjust the supply guide roller again.

2) Change operation mode from the RPS to the play mode (again) and make sure the entry side of envelope rises
within 3 second.

ENTRANCE SIDE ENVELOPE

Fig. 2-17 Video Envelope Rising when Operation mode Changes from RPS to Play Mode

(4) Envelope Check

1) Make recordings on T-120 (E-120) and T-160 (E-180) tape.
Make sure the playback output envelope meets the specification as shown in Fig. 2-18.

2) Play back a self recorded tape (recording made on the unit using with T-120 (E-120).
The video envelope should meet the specification as shown in Fig. 2-18.
In SP mode, (A) should equal (B).
If the head gap is wide, upper cylinder should be checked.

A

B

Fig. 2-18 Envelope Input and Output Level

(5) Tape Wrinkle Check

1) Run the T-160 (E-180) tape in the playback, FPS, RPS and Pause modes and observe tape wrinkle at
each guide.

2) If excessive tape wrinkle is observed, perform the following adjustments in Playback mode :

◆ Tape wrinkle at the guide roller S, T section : Linearity adjustment.

◆ Tape wrinkle at tape guide flange : ACE head assembly coarse adjustment.

Alignment and Adjustments

2-13

Samsung Electronics

2-14

Alignment and Adjustments

Samsung Electronics

2-3-3 Reel Torque

1) The rotation of the capstan motor causes the

holder clutch ass’y to rotate through the belt pulley.

2) The spring wrap PLAY/REV of holder clutch ass’y drives the disk reel S, T through gear idler by rotation of
gear center ass’y.

3) Brake is operated by slider cam at FF/REW mode.

4) Transportation of accurate driving force is done by gears. (Gear Center Ass’y)

Note : If the spec. does not meet the followings specifications, replace the holder clutch ass’y and then recheck.

MODE TORQUE g/cm GAUGE

PB 42 ± 11

Cassette Torquemeter

RPS 145 ± 30

Cassette Torquemeter

<Table 2-4>