FUNAI Service manual / Схема, сервісна інструкція Service manual & schematics

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Page 1

20^° CATV

Page 2

1. ON SCREEN ADJUSTMENT

Purpose:

To display character ON SCREEN correctly.

Symptom of Incorrect adjustment

Character ON SCREEN is incorrect position

Test Point	Adjustment Point	Mode	Input
	L22		SECAM Color Bar
Tape	Equipment		Spec
	SECAM Pattern Generator	See Reference N	lotes below.
	Oscilloscope (5mV/div, 10ms/div -AC)

Reference Notes:

1. Set the COLOR, CONTRAST and BRIGHT controls to center detent position.
2. Input SECAM Color Bar signal to Video In.
3. Indicate ON SCREEN (Bar shape) by PICTURE SELECT KEY.
4. Adjust L22 so that the distance between both ends of ON SCREEN and escussion become equal

2. CLOCK ADJUSTMENT

Purpose :

To adjust internal clock of microprocessor.

Symptom of Incorrect adjustment

Clock become slow and fast.

Test Point	Adjustment Point	Mode	Input
IC3 Pin 17	C143		SECAM Color Bar
IC3 Pin 20
Tape	Equipment		Spec


		(17)

	SECAM Pattern Generator	See Reference	Notes below.
	Frequency Counter

Reference Notes:

1. Connect Pins 17 and 20 of IC3 using a Diode as shown
2. Connect the AC cord.
3. Connect Frequency Counter to Pins 17 and 20 of IC3.
4. Adjust C143 for 87381. 3334±0.5Hz, reading on the frequency counter.

Note :

After adjustment, remove Diode.

3. BELL FILTER ADJUSTMENT (FOR SECAM)

Purpose:

To adjust the center frequency of SECAM Bell Filter.

Symptom of incorrect adjustment

The color will be reversed when the SECAM signal is entered.

Test Point	Adjustment Point	Mode	Input
IC5 Pin 18 (TP6) IC5 Pin 19 (GND) (TP2)	L12 (Bell Filter)		SECAM Color Bar
Таре	Equipment		Spec
	SECAM Pattern Generator Oscilloscope (5mV/div, 10µs/div -AC)	See Reference	Notes below.

Reference Notes:

1. Input SECAM Color Bar signal to Video In or RF (make sure to receive at the best syncronized point).
2. The CONTRAST, BRIGHT, COLOR control to center.
3. Connect oscilloscope as shown below.
4. Set oscilloscope to 10 : 1 probe, AC 5mV/div and Range 10µs/div.
5. Adjust L12 with core driver to flat waveform.

caution !

Do not use metal screw driver to avoid the parts are broken.

Note: L12 : TV Main CBA

Page 3

4. IDENT COIL ADJUSTMENT (FOR SECAM)

Purnose

To adjust the peak value of SECAM IDENT signal

Symptom of incorrect adjustment

The display is not colored when the SECAM signal is entered.

Test Point	Adjustment Point	Mode	Input
IC5 Pin 23 (TP1)	L10 IDENT COIL		SECAM Color Bar
IC5 Pin 19 (GND) (TP2)
Таре	Equipment		Spec
	SECAM Pattern Generator	See Reference No	tes below.
	Oscilloscope (0.2V/div, 5µs/div -DC)
	Digital Voltage meter

Deference Notes

1. Input SECAM Color Bar signal to Video In or RE (make sure to receive at the best syncronized point)
2. Set oscilloscope to 10 : 1 probe. AC 0.2V/div and Range 5us/div.
3. Set the ground (OV) scale to the bottom of screen
4 Turn the CONTRAST BRIGHT and COLOB control to center
5. Connect equipments as shown below
6. Adjust L10 with core driver to peak DC voltage.

CALITION

Do not use metal screw driver to avoid the parts are broken

Note

5. B-Y DEMODULATE COIL ADJUSTMENT (FOR SECAM)

Durnosa

To adjust the level of B-V color difference signal

Symptom of incorrect adjustment The B G and B will be unbalanced

Test Point	Adjustment Point	Mode	Input
IC5 Pin 60 (TP5)	L15		SECAM Color Bar
IC5 Pin 19 (GND) (TP2)
Таре	Equipment		Spec
	SECAM Pattern Generator	See Reference Notes below.
	Oscilloscope (10µV/div, 5µs/div -
	AC)

Reference Notes

1 Input SECAM Color Bar signal to Video In or BE (make sure to receive at the best syncronized point).

2 Set oscilloscope to 10 1 probe AC 10uV/div and Bange 5us/div.
3. Set the ground (OV) scale to the bottom of screen.
4. Turn the CONTRAST, BRIGHT and COLOR control to center.
5 Connect oscilloscope as shown below
6 Adjust 1 15 with core driver to meet same level with @ (blanking) and ① (white) as following drawing.

CAUTION !

Do not use metal screw driver to avoid the parts are broken.

Noto

Page 4

6. B-Y DEMODULATE COIL ADJUSTMENT (FOR SECAM )

Purpose:

To adjust the level of B-Y color difference signal

Symptom of incorrect adjustment

The R, G and B will be unbalanced.

Test Point	Adjustment Point	Mode	Input
IC5 Pin 62 (TP4)	L16 B-Y DEMODULATE COIL		SECAM Color Bar
IC5 Pin 19 (GND) (TP2)
Таре	Equipment		Spec
	SECAM Pattern Generator Oscilloscope (10mV/div, 5µs/div - AC)	See Reference Notes below.

Reference Notes:

1. Input SECAM Color Signal to Video In or RF (make sure to receive at the best syncronized point).

2. Set oscilloscope to 10 : 1 probe, AC 10mV/div and Range 5µs/div.

3. Set the ground (OV) scale to the bottom of screen.

4. Turn the CONTRAST, BRIGHT, COLOR control to center.

5. Connect oscilloscope as shown below.

6. Adjust L16 with core driver to meet same level with a (blanking) and i (white) as following drawing.

CAUTION !

Do not use metal screw driver to avoid the parts are broken

Note:

L16 : TV Main CBA

7.1 H DELAY LINE ADJUSTMENT

Purpose:

To get correct 1H delay line when the PAL signal is entered.

Symptom of incorrect adjustment

The Anti-PAL signal part is colored when the Philips pattern is entered. Each scanning line is colored on the color bar.

Test Point	Adjustment Point	Mode	Input
IC5 Pin 62 (TP4)	VR9		Philips Pattern
IC5 Pin 19 (GND) (TP2)	L14
Таре	Equipment		Spec
	Pattern Generator	See Reference I	Notes below.
	Oscilloscope

Reference Notes:

1. Input Philips Pattern.
Connect oscilloscope to TP2 (GND) and TP4 (or Synchronize the oscilloscope externally through the D14 anode.)
3. Adjust VR9, L14 so that the amplitude at Anti-PAL signal part becomes minimum (no color) and the waveform at the Color Bar part is not seen in double ("Venetian Blind" does not appear at the Color Bar signal part).

Note:

VR9, L14 : TV Main CBA

Anti-PAL Signal

Page 5

8. V. SIZE, H. SIZE and H. POSITION ADJUSTMENT

Purpose:

To get correct vertical height of screen image

Symptom of Incorrect adjustment.

Vertical height of screen image may not be properly displayed.

Test Point	Adjustment Point	Mode	Input
	VR11 (V-SIZE)		Monoscopic Pattern
	L27 (H.SIZE)
	VR13 (H. POSITION)
Таре	Equipment		Spec
	Monoscope	90% +5/0

Reference Note:

Adjust VR11 and VR13 and L27 so that vertical size, horizontal size and horizontal position of the Monoscopic Pattern will be 90% of display size and the circle is round and placed on the center of the screen.

Note

L27, VR11, VR13 : TV Main CBA

9. CUT OFF ADJUSTMENT

Purpose:

To adjust the beam current of R, G, B and screen voltage

Symptom of incorrect adjustment

White Color may be reddish, greenish or bluish.

When the screen voltage is too high, the scanning line is appeared on the screen.

Adjustment Point	Mode	Input
VR1, VR3, VR4		White Scale
SCREEN VR		(APL 100 %)
Driver VR
Equipment		Spec
Pattern Generator	See Reference	Notes below.
	Adjustment Point VR1, VR3, VR4 SCREEN VR Driver VR Equipment Pattern Generator	Adjustment Point Mode VR1, VR3, VR4 SCREEN VR Driver VR Equipment Pattern Generator See Reference

Reference Notes:

1. Input White Scale (APL 100%). Set sub-brightness VR to center.
2. Turn the SCREEN VOL control fully counterclockwise to minimum position.
3. Set Driver VR, VR2 and VR5 to center.
4. Set Service Switch (SW1) to ON position.
5. Slowly turn the SCREEN VOL to a point where either one of RED, GREEN or BLUE (horizontal bar) just illuminates.
6. Turn each VR1 (BLUE), VR3 (GREEN) and VR4 (RED) control to get white horizontal bar
7. Turn off the Service Switch. (R. Drive-VR5 and B. Drive-VR2 are set to the center position)

Note:

VR1-VR5 : TV CRT CBA SCREEN VR, Driver VR : TV MAIN CBA

10. WHITE BALANCE ADJUSTMENT

Purpose

To mix red, green and blue beams correctly for pure white.

Symptom of Incorrect adjustment

White becomes bluish or reddish.

Test Point	Adjustment Point	Mode	Input
	VR1, VR2,		White Signal
	VR3, VR4,		(APL 100 %)
	VR5
Таре	Equipment		Spec
	Pattern Generator	See Reference Notes below.
	Color Analyzer

Reference Notes:

1. Input APL 100% white
2. After aging for 20-30 minutes, demagnetize the tube surface (CRT) with a demagnetizer.
Set Color Analyzer to the CHROMA mode, and after zero point calibration, bring the optical receptor into close contact with the center on the tube surface (CRT). Then, adjust R. Drive (VR2) and B. Drive (VR5) so that the respective chroma temperatures become 8000 °K 10 MPCD. (x : 0.300 / y : 0.290)
4. Turn Service Switch ON.
At this time, check that the horizontal line is white. If the horizontal line is not white, adjust the B. CUT OFF (VR1) and R. CUT OFF (VR4) to get white horizontal bar. G. CUT OFF (VR3) should be fixed without adjusting.
6. Turn Service Switch OFF, and using the color analyzer, check that the color temperature read is preset value.
7. Repeat steps 3, 4, 5 and 6 above, and adjust so that the settings of color temperature and horizontal line are at their best.
Note 1: Be sure the tube surface faces east.
Note 2: Make this adjustment under European magnetic field. (Vertical : 0.44G / Horizontal : 0.18G).
Note 3: Already adjusted SUB BRIGHT, V-SIZE, H. SIZE, H. POSITION, CUT OFF and 1H DELAY LINE.
Note 4: The allowable range during color temperature adjustment should be ±5% Max.

Note:

VR1-VR5 : TV CRT CBA

Page 6

11 SUB BRIGHT ADJUSTMENT

Purpose:

To get proper brightness.

Symptom of incorrect adjustment

Proper brightness cannot be obtained by adjusting the Bright Control

Test Point	Adjustment Point	Mode	Input
-	VR12 (SUB. BRT)		Gray Scale
Таре	Equipment		Spec
-	Pattern Generator	See Reference	Notes below.

This portion starts to glitter

Reference Notes

1. Input the 8-step graduated Grav Scale
2. Set CONT VR and BRIGHT VR to center.
3. Adjust VR12 to a point where the one level higher than the black-level starts flashing. (2nd level from the right)
4 If you have Color Analyzer, proceed to next step
5. Fit the receiver of Color Analyzer to the portion on the screen where is described in step 3 and adjust VB12 to be obtained V=0.5 ±0.2 / -0.1ft-l

Note

VR12 · TV Main CBA

12. FOCUS ADJUSTMENT

Purpose:

To get correct focus.

Symptom of incorrect adjustment:

Blurred image is shown on the display

Test Point	Adjustment Point	Mode	Input
	Focus VR (FBT)		Monoscopic Pattern
Tape	Equipment	Spec
	Monoscope	Clear picture

Reference Note:

Set both Contrast and Brightness controls to the middle position prior to the adjustment. Note

Focus VR (FBT) : TV Main CBA

13 TELETEXT AD ILISTMENT Purnose:

To syncronize TELE TEXT signal

Symptom of incorrect adjustment

TELETEXT is not displayed synchronously

Test Point	Adjustment Point	Mode	Input
IC501 Pin 28	L502		SECAM Color Bar
Таре	Equipment		Spec
	SECAM Pattern Generator DC Voltage Meter	See Reference Notes below.

Reference Notes

1. Input SECAM Color Bar signal to Video Input or RF (make sure to receive at the best syncronized point) 2. Set to TEXT mode by TEXT / MIX KEY

3. Adjust L502 so that the DC Voltage IC501 Pin 28 of between and GND becomes DC2.5V.

caution !

The shield case of TEXT PCB connects the ground copper patterns of Main PCB, after removing the shield cases so. make sure to connect the solder holes of the shield case by wives for properly servicing.

Page 7

11. SCHEMATIC DIAGRAM

11-1

Page 8

TELETEXT PCB

Page 9

12. WAVEFORMS

Point : A 1Div : 5ms 1Div 20V

Point : E 1Div 20us 1Div = 50V

Point : I 1Div - 20us 1Div - 2V

Point : M 1Div :: 20us 1Div := 2V

Point : Q 1Div = 20us 1Div = 50V

Point : B 1Div = 20us 1Div = 5V

Point : F 1Div = 10us 1Div = 100V

Point : J 1Dív = 20us 1Dív = 2V

Point : N 1Div = 20us 1Div = 2V

Point : R 1Div = 20us 1Div = 0.1V

Point : C 1Div = 20us 1Div = 250V

Point : D 1Div : 20us 1Div : 2V

Point : G 1Div = 20us 1Div = 0.5V

Point ∶ H 1Div ∞ 20us 1Div ← 0.5V

Point : K 1Div = 5ms 1Div = 0.5V

Point : L 1Dív = 20us 1Dív = 2V

Point : O 1Div = 20us 1Div = 50V

Point : P 1Div 20us 1Div 50V

Page 10

13. VOLTAGE CHARTS

(unit: V)

Input Signal : Color bar Signal Tone Volume : MAX.

(unit: V)
	E	С	В
Q1	9.07	5.1	9.07
Q2	4.12	9.08	4.71
Q 3	0	9.08	22.6m
Q 4	4.25	11.97	4.93
Q 5	0	11.16	55m
Q6	2.18	9.73	2.78
Q7	6.96	11.98	7.64
Q 9	0	4.6	-0.9
Q12	0	39.3	0.4
Q13	0	120	-0.18
Q14	3.55	159.3	3.84
Q15	3.44	154.2	3.83
Q16	3.51	154.7	3.83
Q17	0	5.07	36.6m
Q18	0	3.88	20.2m
Q19	0	1.25	0.42
Q20	0	1.6	0.42
Q21	5.74	0	5.07
Q22	0	3	0.43
Q23	0	8.17	0.38
Q24	9.05	0	9.07
Q25	9.06	8.94	8.3
Q26	0	0	9.06
Q27	0	9.01	0
Q28	0	0	0.64
Q29	0	9.03	0
Q30	0	0.13	0.8
Q31	0	0.26	0
Q32	0	0.26	0
Q33	0	0.26	0
Q34	4.03	0	3.37
Q35	0	1.7	0.55


		Е	С	В
Q37	P/S	0	0	0
	N	0	0	0.6
Q38	P/S	0	6.28	0
	N	0	0	0.6
Q39	P/S	5	0	5.9
	N	5.48 ·	1.47	4.85
Q40	P/S	5	0	4.42
	Ν	5.45	0	5.91
Q41	P/S	0	11.9	53.8m
	Ν	0	0	0.6
Q42		3.4	0	2.72
Q43		0	53.8m	0.72
Q44	Р	0	4.78	0
	S	0	10.1	0
	Ν	0	0	0.6
Q46		0	52.9m	0.75
Q501		2.81	4.93	3.52

(- )
	IC1	IC2	IC4	IC7	IC8	IC10
1	7.64	5.28	11.97	40.5	11.97	0
2	86m	3.51	7.8	0.34	5.3	13.55
3	86m	3.51	88.6m	-0.1	0	27.9
4	4.67	3.51	6.33	25	11.35	0.9
5	0	0	0	-1.06	5.6	0.76
6	3.15	5.11		0	5.86	27.6
7	11.96	5.11	6.98	-0.46	0	1.3
8	3.15	5.11		0.19	5.19
9	3.72				12.24
10				391

(unit: V)
	IC6	IC9	IC4	IC7	IC14	IC503
1	12.25	15.3	5.28	12	0	4.94
2	0	0	0	0	32.5	0
3	6.07	12	5.17	9		48.9

IC3 3.35 22 5.1 2.62 23 2.62 24 З 4 2.62 25 0 26 5 80.6m 3.87 0 27 5.07 6 5.25 3.09 28 8 0 29 3.08 2.5 0 9 30 10 3.5 3.5 31 2.47 32 2.63 12 3.5 33 5.16 13 5.1 34 14 5.2 35 5.09 15 5.2 36 4.57 16 5.2 37 74m 17 5.1 38 39 28.5m 18 5.2 27m 19 5.25 40 5.26 20 21 5.25 41 5.26 0 42 5.26

	IC501	IC502
1	1	4.98
2	3.58	2.42
3	3.58	0
4	4.98	1.35
5	4.92	0.8
6		1.3
7	0	1.35
8		0
9	4.98	2.4
10	0	1.35
11	0.12	2.19
12	4.57	2.33
13	4.97	0
14	0	4.58
15	0.25
16		4.96
17	5.25	0.12
18	5.25	0
19	0.25	0
20	0.25	0.25
21	4.98
22	0.25
23	0.25
24	0
25	2.26
26	2.26
27	2.51
28	2.5

	IC5
	PAL	SECAM	NTSC		PAL	SECAM	NTSC
1	8.52	8.46	8.53	33	7.13	7.13	7.13
2	7.95	7.88	7.91	34	3.61	3.61	3.61
3	8.5	8.44	8.48	35	1.2	1.2	1.2
4	6.5	5.8	6.51	36	7.69	7.69	7.68
5	6.5	5.8	6.51	37	5.99	5.96	5.98
6	11.97	11.97	11.97	38	6.93	6.93	6.93
7	3.4	3.4	3.4	39	2.31	2.31	2.31
8	6.52	5.82	6.54	40	9.07	9.07	9.07
9	6.52	5.83	6.54	41	3.84	3.94	3.84
10	5.93	5.93	67m	42	3.85	3.91	3.83
11	5.81	2.26	2.26	43	3.85	3.85	3.83
12	5.16	5.22	5.16	44	5.16	5.16	5.16
13	5.15	5.22	5.16	45	5.06	5.08	5.07
14	7.64	7.77	10.1	46	5.08	5.08	5.07
15	5.94	5.94	5.94	47	7.21	7.21	7.2
16	10.42	10.42	10.53	48	3.23	3.23	3.23
17	3.45	3.45	3.45	49	7.16	7.16	7.16
18	4.39	4.39	7.26	50	0	0	0
19	0	0	0	51	7.26	7.26	7.25
20	4.77	4.77	4.77	52	0	0	0
21	67.2m	118m	1.9	53	0	0	0
22	11.33	5.22	5.23	54	0	0	0
23	5.34	11.33	5.24	55	5.26	5.26	5.26
24	5.77	5.7	5.8	56	3.14	3.14	3.14
25	4.63	4.75	4.7	57	5.8	5.8	5.8
26	3.21	3.21	3.21	58	4.7	4.7	4.7
27	5.76	4.56	10.9	59	3.87	3.93	3.7
28	3.21	3.21	3.21	60	6.01	6.01	6.02
29	0.88	0.88	0.89	61	11.95	11.95	11.95
30	7.92	8.3	7.3	62	6	6	6
31	6.6	6.6	6.6	63	11.95	11.95	11.95
32	6.56	5.56	6.57	64	7.97	7.97	7.97

P ······ PAL system S ······ SECAM system N ····· NTSC system