Aiwa TV-SA2055 Bedienungsanleitung

SERVICE MANUAL

DATA

COLOR TELEVISION

TV-SA2055

S/M Code No. 09-00B-431-5S1

SUPPLEMENT

•This Service Manual contains the additional information “DISASSEMBLY

INSTRUCTIONS” and “ADJUSTMENT” for the model TV-SA2055 (KE).

If requiring the other information, see Service Manual of TV-SA2055 (KE),

(S/M Code No. 09-005-431-5R1).

– 2 –

Anode cap

CRT GND

Hook CRT

CRT GND

Grip

DISASSEMBLY INSTRUCTIONS

1. REAR CABINET REMOVAL

Figure 1-1

2. HIGH-VOLTAGE CAP (ANODE CAP) REMOVAL

2-1. Cautions before Removing

Discharge the anode voltage

(1) The anode voltage is not discharged completely from the

CRT of this unit even after the power is turned off. Be

sure to discharge the residual anode voltage before

removing the anode cap.

Do not use pliers

(2) Do not use pliers, etc. to remove the anode cap. If you

usedpliersandbentthehooktoremovethecap,thespring

characteristics of the hook could be lost, and when

reinstalled, the cap would come off from the CRT anode

button easily, causing an accident.

Do not turn the anode cap

(3) If the anode cap is turned in the direction of its

circumference, the hook is likely to come off.

2-2. Anode Cap Removal

Discharge the anode voltage. (See Figure 2-1)

(1) Connect a flat-bladed screwdriver to the CRT GND via

an alligator clip.

(2) Use a tester to check theendofthescrewdriverandground

of the TV for continuity.

(3) Touch the hook with the end of the screwdriver.

Caution : Be careful not to damage the anode cap.

(4) Turn over the anode cap.

Caution : Be careful not to damage the anode cap.

Figure 2-1

Figure 2-2

Front cabinet

Rear cabinet

Anode cap

CRT

Hook

Anode button

(1) Remove four screws 1and three screws 2,thenremove

the rear cabinet in the direction of the arrow.

(See Figure1-1)

–3 –

(5) Push the anode cap with your thumb in the direction of

arrow 1as shown in the figure, then lift the cap in the

direction of arrow 2to release the hook on one side.

(See Figure 2-3)

(6) Turn over the anode cap on the side where the hook was

released and pull out the cap in the direction opposite to

that on which the cap was pushed. (See Figure 2-4)

Caution : Do not pull out the anode cap straight up.

:Do not pull the cap forcibly. After removing

the cap, check that the hook is not deformed.

Figure 2-3

3. ANODE CAP REINSTALLTION

Observe the cautions carefully so that no accident occurs

due to a defect in installing the anode cap and so it does

not come off.

3-1. Caution before Reinstalling

Never turn the anode cap after installing it

Never re-use the hook when it has been deformed

(1) If the anode cap is turned after it is installed, it may come

off. Therefore, arrange the high-voltage cable before

attaching the anode cap. (See Figure 3-1)

(2) If you have attached the anode cap before arranging the

high-voltage cable, arrange the cable carefully so the cap

does not turn.

3-2. Anode cap reinstallation

(1) Use a clean cloth moistened slightly with alcohol to clean

the installation section. (See Figure 3-2)

Caution : Check that the installation section is free from

dust, foreign matter, etc.

(2) Coat the anode cap installation circumference with an

appropriate amount of the specified silicone grease (KS-

650N).

Caution : Be careful that silicone grease does not enter

the anode button.

CRT CRT

Anode cap

Hook Hook

Anode cap

Hook

Anode button

CRT

Left Right

Anode cap

Anode button

Installation

section

Figure 2-4

Figure 3-1

Figure 3-2

–4 –

(3) Eliminate twisting, etc. of the high-voltage cable and

arrange it so that no twisting occurs. (See Figure 3-3)

Caution : If the cable is not arranged correctly, the anode

capcould turnandcauseaninstallationdefect.

(4) Turn over the rubber cap symmetrically on the left and

right. (See Figure 3-4)

Caution : Take great care not to damage the anode cap.

Figure 3-3

(5) Fit your forefinger over the projection at the center of the

cap and hold the cap between your thumb and middle

finger. (See Figure 3-5)

High-voltage cable Anode cap

Figure 3-4

Figure 3-5

–5 –

(6) Apply the hook on one side to the anode button as shown

on the figure. (See Figure 3-6)

Caution : Check that the hook is held securely.

(7) Apply the hook on the other side to the anode button as

shown in Figure 3-7.

(8) Pull the anode cap slightly with the rubber cap turned

over and visually check that the hook is engaged securely.

(9) Release your hand from the rubber cap of the anode cap.

Caution : Cover the anode cap so that it does not lift.

(10) Hold the skirt of the andoe cap slightly to improve the

close contact between the cap and CRT.

(11) Check that the anode cap is in close contact with the CRT.

(See Figure 3-8)

Figure 3-8

Figure 3-7

Figure 3-6

Anode button

Skirt

Hook

Anode button

Hook

Anode button

Hook

30°

–6 –

4. NK C.B. (PWB, NK) REMOVAL

Figure 4-1

(1) Disconnect CN553 (CRT GND).

(2) Disconnect CN551, CN552

(3) Remove the NK C.B. in the direction of arrow 1.

(See Figure 4-1)

5. MAIN C.B (PWB, MAIN) REMOVAL

(1) Remove connector (CNA900).

(2) Remove connector (CN801).

(3) Remove connector (CN802).

(4) Pull out the MAIN C.B. in the direction of the arrow 2

(See Figure 4-1).

CN801

(Power Cord)

Front cabinet

MAIN C.B

CNA900

(Speakers)

CN553

NK C.B

CN552

CN551

CN802

(Degauss

cord)

–7 –

Color bar signal of a pattern generator

PRECAUTIONS BEFORE STARTING ADJUSTMENT

Satisfy the following setting conditions before starting adjustment.

• Allow warm-up of 20 minutes or longer. (Do not turn off during

warm-up.)

• Set all picture quality controls of users' setting to initial set-up,

unless otherwise specified.

• Picture quality reset

1. Select "Picture" on the screen menu and press enter button.

2. Select "Normal" and press enter button.

3. Select "Reset" and press enter button.

• Set the pattern generator’s output level to 1.0Vp-p (across 75Ω

load).

Because the video signal output from a pattern generator is used as

the adjustment signal input during adjustment, the video signal

output from the pattern generator must conform with the

specifications. Measure the output waveform across 75 Ωload.

Confirm that the synchronizing signal has an amplitude of about

0.3 V, the video signal portion has an amplitude of about 0.7 V and

the burst signal has an amplitude of about 0.3 Vwith flat envelope.

Confirm that ratio of the burst signal amplitude and the red signal

amplitude is 0.30 : 0.66. If the output signal does not conform with

the specifications, calibrate the pattern generator. (Refer to pattern

generator operation manual.)

Use the LEADER: LCG 404 for the pattern generator.

Fig. 1-1

Approx.

0.3V

Approx. 0.3V

Burst signal

1 Vp-p

White (Approx.

75%)

Approx. 0.7V

Yellow

Cyan

Green

Magenta

Red

Blue

Black

75% white

TV display

1-1. Precautions

(1) Receive the white raster signal, and then perform aging for at

least 20 minutes.

(2) Demagnetize the area surronding the CRT with a degausser

before making adjustments.

(3) Set the picture quality for each mode to the factory setting.

(4) Position the front screen facing the east as much as possible.

1-2. Purpose

(1) Beam landing adjustment (purity magnet)

Set the left/right balance of beam landing. If there is a

discrepancy in this adjustment, a color irregularity will occur.

After completion of the landing adjustment, it is necessary to

perform convergence adjustment.

Color

irregularity

Color

irregularity

Before adjustment After adjustment

ADJUSTMENT

SET-UP FOR ADJUSTMENT 1. CRT ADJUSTMENT

–8 –

(2) Beam convergence adjustment (4-pole magnet)

Align the R beam with the B beam. The G beam does not

move with this adjustment.

RR/B

Align the R beam with the B beam

Fig. 1-2

(magenta)

(4) The composition of each magnet is as shown in Fig. 1-4.

In making adjustments, rotate the lock ring clockwise (looking

from the CRT’s back screen) and disengage.

Be careful not to loose the lock ring too much. If the magnet

assembly has become shifted during adjustments, secure it to

the position in Fig. 1-4.

(3) Beam convergence adjustment (6-pole magnet)

With a 4-pole magnet align the G beam with the alreadyaligned

R/B beam.

R/B

RGB

(magenta)

(white)

Align the G beam with the R/B beam

Fig. 1-3

CRT DY

DY lock screw Purity 4-pole 6-pole Lock ring

NK C.B

Magnet assembly

Fig 1-4

Magnet assembly

lock screw

–9 –

(1) Receive the green raster signal from the pattern generator.

(2) Loosen the magnet lock screw, and shift the magnet assembly

backward (toward the neck).

(3) Loosen the DY lock screw, and shift the DY deflecting yoke

backward (toward the neck).

(4) After opening the two purity magnets to the same angle, adjust

the color width of the bands on both sides of the screen so that

they are equal. (refer to Fig. 1-5 (a)).

RGB

Fig 1-5 (a)

As shown in Fig. 1-5 (b), the purity magnet functions in

relation to the electron beam.

(5) Gradually shift the deflecting yoke toward the front (toward

the CRT funnel). Stop movement at the point when the screen

has become completely green.

SNNS

NS SN

Fig 1-5 (b)

(6) Also, verify the respective monochromatics of red and blue.

(7) While looking at the screen, adjust the tilt of the deflecting

yoke and tighten the DY lock screw.

(8) Shift the magnet assemblytothefront(towardtheCRT funnel),

stopmovementbeforetheadjustmentpositionandthentighten

the magnet lock screw.

At this time, be careful not to shift the position of the purity

magnet.

R=B

As there is occurrence of convergence distortion after

completing the landing adjustments, be sure to carry out

convergence adjustments.

If the color irregularities in the screen’s corner section are

not improved, correct them with the landing magnet. After

using the landing magnet, be sure to demagnetize the CRT

with degausser and verify that there is no occurrence of color

irregularity. (refer to Fig. 1-6)

Landing magnet: 81-JTI-710-010

(two-sided adhesive tape) : 80-XVI-218-010 Cushion

Cushion

Landing magnet

Since the landing magnet is polarized,

check the screen’s improvement through

rotation, not only by position.

Fig 1-6

1-3. Beam Landing Adjustment

–10 –

Make adjustments on the convergence with 4-pole and 6-pole

magnets. Operate each magnet in relation to the electron beam as

showninFigs.1-7and1-8.When performing this adjustment, verify

whether there is distortion in the focus adjustment. If necessary,

carry out adjustments again.

BGR

Fig 1-7

Fig 1-8

In Fig. 1-7, two 4-pole magnets are stacked together so as to be of

the same polarity. Move the B and R beams to their respective

direction, by rotating the two 4-pole magnets together. By adjusting

the opening of the two magnets, it is possible to adjust the amount

of the beam’s movement.

Perform this adjustment after completion of adjustment 1-4.

(1) Shake the deflecting yoke up, down to the right and left, and

adjust any discrepancies in the screen’s surroundings.

(2) Insert wedges in three locations in the gap between the

deflecting yoke and the surface of the CRT funnel in order

to secure the deflecting yoke. (Refer to Fig. 1-9)

Position of wedge

Fig. 1-9

Wedge

Wedge Wedge

In Fig. 1-8, the two 6-pole magnets are stacked together so as to be

of the same polarity. Move the B and R beams to their respective

direction, by rotating the two 6-pole magnets together. By adjusting

the opening of the two magnets, it is possible to adjust the amount

of the beam’s movement.

(1) Receive the dot pattern signal from the pattern generator.

(2) Pay attention to the center of the screen, and perform

adjustments with two 4-pole magnets so that the R beam and

B beam are perfectly aligned and become a magenta color.

(Refer to Fig. 1-2)

(3) In the same way, pay attention to the screen, and perform

adjustments with a 6-pole magnet so that the magenta beam

and G beam are aligned and become a white dot.

(Refer to Fig. 1-3)

(4) After adjustments are completed, secure all magnets with the

lock link. (Refer to Fig. 1-4)

GRB

1-4. Beam Center Convergence Adjustment 1-5. The Surrounding Convergence Adjustment

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