Aiwa TV-FT2588 Service Manual

TV-FT2588

SHA, SHR

SERVICE MANUAL

COLOR TELEVISION

• This Service Manual contains the additional information “DISASSEMBLY
INSTRUCTIONS” and “ADJUSTMENT” for the model TV-FT2588 (SHA, SHR).
If requiring the other information, see Service Manual of TV-FT2588 (SHA, SHR),
(S/M Code No. 09-007-433-6R1)

S/M Code No. 09-008-433-6S1

SUPPLEMENT

DATA

DISASSEMBLY INSTRUCTIONS

1. REAR CABINET REMOVAL

(1) Remove eight screws 1, then remove the rear cabinet in

the direction of the arrow.
(See Figure1-1)

2. HIGH-VOLTAGE CAP (ANODE CAP) REMOVAL

Front cabinet

Rear cabinet

Figure 1-1

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

used pliers and bent the hook to remove the cap, the spring
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

Anode cap

Grip

CRT GND

Hook

CRT GND

CRT

Figure 2-1

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 the end of the screwdriver and ground

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.

– 2 –

CRT

Anode cap

Anode button

Hook

Figure 2-2

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

arrow 1 as shown in the figure, then lift the cap in the
direction of arrow 2 to release the hook on one side.
(See Figure 2-3)

Anode cap

(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.

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.

CRT

Hook

Left

CRT

Hook

Figure 2-3

Anode cap

CRT

Anode button

Hook

Figure 2-4

Anode cap

Right

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 (KS­650N).
Caution : Be careful that silicone grease does not enter

the anode button.

Figure 3-1

Anode button

Installation
section

– 3 –

Figure 3-2

(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

cap could turn and cause an installation defect.

(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.

High-voltage cable

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)

Figure 3-4

Figure 3-5

– 4 –

(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.

Anode button

Hook

Hook

Anode button

30°

Anode button

Hook

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 3-6

Anode button

– 5 –

Skirt

Figure 3-8

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

(1) Disconnect CN903 (CRT GND).
(2) Disconnect CN901, CN902
(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 (CN408).
(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)

CN802
(Degauss
cord)

NK C.B

CN901

CN902

CN903

Front cabinet

AUDIO C.B

MAIN C.B

CN408
(Speakers)

Figure 4-1

– 6 –

ADJUSTMENT

SET-UP FOR ADJUSTMENT 1. CRT ADJUSTMENT

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 Ω load.
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 V with 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.

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.

Approx. 0.7V

1 Vp-p

White (Approx.

Burst signal

75%)

Approx. 0.3V

Red

Magenta

Blue

Black

Cyan

Yellow

75% white

Green

TV display

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 75 Ω
load).

Approx.

0.3V

Before adjustment After adjustment

Color

Color
irregularity

irregularity

Fig. 1-1

– 7 –