JVC AV21BF5EES, AV21BF5ENS Service Manual

A
A
SERVICE MANUAL
COLOUR TELEVISION
AV21BF5ENS
AV21BF5EES
V21BF5ENS V21BF5EES
CONTENTS
SPECIFICATIONS
SAFETY PRECAUTIONS
FEATURES
MAIN DIFFERENCE LIST
SPECIFIC SERVICE INSTRUCTIONS
SERVICE ADJUSTMENTS
PARTS LIST
OPERATING INSTRUCTIONS
STANDARD CIRCUIT DIAGRAM
1
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・・・
・・・・・・
2 4 5 5 6 9
17
2-1
No.51879 Jan. 2002
A
V21BF5ENS
A
V21BF5EES

SPECIFICATIONS

ITEM
Content
AV21BF5ENS AV21BF5EES
Dimensions (WxHxD)
Weight
TV RF System
Colour System
Teletext System
Stereo System
Tuning System
Number Of C H memory position
Receiving Frequency
Intermediate Frequency
Colour Sub Carrier Frequency
Aerial Input Terminal
Power Input
Power Consumption
Picture Tube
High Voltage
Speaker
Audio Output
Input
Output
Input Terminal
Output Terminal
Remote Control Unit
TV Mode
Video Mode
VHF (VL)
VHF (VH)
UHF
CATV
VIF Carrier
SIF Carrier
Video
S/Video
Audio (L/R)
Video
Audio (L/R)
Rear Side
Front Side
Front Side
Rear Side
60 x 45 x 48 cm
22.2 kg
B/G B/G, D/K, K1
PAL PAL / SECAM
PAL / SECAM / NTSC 3.58 / NTSC 4.43
Fastext / Topt ext
A2 / NICAM
Frequenc y Synthesizer T uning System
100 ch
46.25MHZ ~ 168.25MHz
175.25MHz ~ 463. 25MHz
471.25MHz ~ 863. 25MHz
Super (S11-S20) & Hyper (S21-S41) bands receivable
38.9MHz
32.4MHz (6.5MHz)
32.9MHz (6.0MHz)
33.4MHz (5.5MHz)
PAL (4.43MHz), SECAM (4.43MHz), NTSC (3.58MHz/4.43MHz)
75 Ohm Unbalanc ed
AC 220 ~ 240V, 50Hz
95W(Max.)/73W (Avg.) Stand-by<5W
21 inch measured diagonally
27kV (in cut-off service mode)
57x160 mm oval type x2
8W +8W
1Vp-p, 75 Ohm
Y: 1Vp-p Positive C: 0.286Vp-p
500 mVrms, High Impedance
1 Vp-p, 75 Ohm
500 mVrms, Low Impedance
AV1 (Video/Audio/RGB)
AV2 (Video/Audio/S-VHS)
AV3 (Video/Audio)
Headphone jack (Stereo mini jack 3.5)
AV1 (Video/Audio)
AV2 (Video/Audio) (Selected TV, AV1 or AV3)
RM-C85, Battery size:AAA/R03 x 2
Design & specifications are subject to change without notice.
2
No.51879
A
A
■■■■
21-pin Euro connector (SCART socket) : AV-1 / AV-2
(P-P= Peak to Peak, S-W= Sync tip to white peak, B-W= Blanking to white peak)
Pin No.
Signal Designation Matching Value AV-1 AV-2
1 AUDIO R output 500mVrms(Nominal),Low impedance
2 AUDIO R input 500mVrms(Nominal),High impedance
3 AUDIO L output 500mVrms(Nominal),Low impedance
4 AUDIO GND
V21BF5ENS
V21BF5EES
(TV OUT)
○○
(TV OUT)
○○
(TV/LINE OUT)
(TV/LINE OUT)
5 GND (B)
6 AUDIO L input 500mVrms(Nominal), High impedance
7B input
FUNCTON SW
8
(SLOW SW)
9 GND (G)
10 - NC -
11 G input
12
- NC -
13 GND (R)
14 GND (YS)
15 R / C input
16 Ys input
17 GND(VIDEO output)
18 GND(VIDEO input)
19 VIDEO output
20 VIDEO / Y input
700mV
Low : 0-3V, High : 8-12V, High impedance
700mV
R : 700mV C : 300mV
Low : 0 – 0.4, High : 1 - 3V, 75
1V
1V
, 75
B-W
Ω○
, 75
B-W
Ω○
, 75
B-W
Ω
, 75
P-P
Ω
(Negative going sync), 75
S-W
(Negative going sync), 75
S-W
Ω○
Ω
Ω○
○○
○○
○○
○○
(R/C)
○○
○○
(TV)
(TV/LINE OUT)
NC
NC
NC
NC
(only C)
NC
21 COMMON GND
[
Pin assignment
]
No.51879
○○
3
A
V21BF5ENS
A
V21BF5EES

SAFETY PRECAUTIONS

1. The design of this product contains special hardware, many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical t o those us ed in the original circuits. Service should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the products should not be made. Any design alterations or additions will void the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting theref rom.
3. Many electric al and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can t he protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the parts list of Service manual.
components having such features are identified by shading on the schematics and by ( manual.
have the s ame safety characteristics as the recommended replacement part shown in the parts list of S ervice manual may cause shock, fire, or other hazards.
The us e of a substitute replacement which does not
) on the parts list in Service

Electrical
4.
Don't short between the LIVE side ground and ISOLATED (NEUTRAL) side ground or EARTH side ground when repairing.
Some model's power circuit is partly different in the GND. The differenc e of the GND is shown by the LIVE side GND, the ISOLATED(NEUTRAL) side GND and EARTH side GND. Don't short between the LIVE side GND and ISOLATED(NEUTRAL) side GND or EARTH side GND and never measure with a measuring apparatus (oscilloscope etc.) the LIVE side GND and ISOLATED(NEUTRAL) side GND or EARTH side GND at the same time. If above note will not be kept, a fuse or any parts will be broken.
5. If any repair has been made to the chassis, it is recommended that the B1 setting should be checked or adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).
6. The high voltage applied to the picture tube must conform with that specified in Servic e manual. E xcessive high voltage can cause an incr ease in X-Ray emission, arcing and possible component damage, therefore operation under excessive high voltage conditions should be kept to a minimum, or should be prevented. If s evere arcing occurs, remove the AC power immediately and determine the cause by visual inspection (incorrect installation, cracked or melted high voltage harness, poor soldering, etc.). To maintain the proper minimum level of soft X-Ray emission, components in the high voltage circuitr y including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the c omplete product.
7. Do not check high voltage by drawing an arc. Use a high voltage meter or a high voltage probe with a VT VM. Discharge the picture tube before attempting meter connection, by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10k: 2W resistor to the anode button.
8. W hen service is required, observe the original lead dress. Extra precaution should be given to assure c orrect lead dress in the high voltage circuit area. Where a short circuit has occ urred, those components that indicate evidence of overheating should be replaced. Always use the manufacturer's replacement components.
9.
Isolation Check (Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal c abinet, screwheads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electr ic al shock.
(1)
Dielectric Strength Test
The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V AC (r.m.s.) for a period of one second.
(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance
rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a period of one second.) This method of test requires a test equipment not generally found in the s ervice trade.
(2)
Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Using a "Leakage Current T ester", measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any leakage curr ent must not exceed
0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC (r.m.s.).
Alternate Check M ethod
zzzz
Plug the AC line cord directly into the AC outlet (do not use a line isolation transf ormer during this check.). Use an AC voltmeter having 1000 ohms per volt or more sensitivity in the following manner. Connect a 1500: 10W resistor paralleled by a 0.15PF AC-type capacitor between an exposed metal part and a known good earth ground (water pipe, etc.). Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a retur n path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). However, in tropical ar ea, this must not exceed 0.3V AC ( r.m.s.). This corresponds to 0.2mA AC (r.m.s.).
AC VOLTMETER
0.15μF AC-T YPE
1500
GOOD EARTH GROUND
:
(HAVING 1000 OR MORE SENSITIVITY)
10W
/V,
:
PLACE THIS PROBE ON EACH EXPOSED METAL PART
4
No.51879
A
A

FEATURES

V21BF5ENS
V21BF5EES
1. It is a remote controlled c olor television.
2. 100 programs from VHF, UHF bands or cable channels can be preset.
3. It can tune cable channels.
4. Controlling the TV is very easy by its menu driven s ystem.
5. It has two Euroconnector s ockets f or external device (such as video recorder, video games, audio set, etc.)
6. Front AV Input available.
7. Stereo sound syst ems (German + Nicam) ar e available.
8. Full function Teletext (F astext, Toptext).
9. It is possible to connect headphone.
10. Direct channel access.
11. APS (Automatic Programming System).
12. All programs can be named.
13. Forward or backward automatic tuning.
14. Automatic sound mute when no transmission.
15. 5 minutes after the broadcasting (closedown), the TV switches itself automatic ally to stand-by mode.

MAIN DIFFERENCE LIST

MODEL No.
Parts Name
MAIN PWB VE-20073855 VE-20073865
AV21BF5ENS AV21BF5EES
F CARTON BOX VE-20074340 VE-20074390
INST BOOK VE-50021021 VE-50021020
RATING LABEL VE-20074339 VE-20074389
TV RF system B/G B/G, D/K, K1
Colour system (TV MODE)
PAL PAL / SECAM
No.51879
5
Loading...
+ 11 hidden pages