JVC AV28S2EKGR User manual

No.51777
AV28S2EKGR / AV28S2EKBL
AV28S2EIGR / AV28S2EIBL
1COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
Mar. 2001
AV28S2EKGR / AV28S2EKBL
AV28S2EIGR / AV28S2EIBL
SERVICE MANUAL
COLOUR TELEVISION
BASIC CHASSIS
JK

A
V28S2EKGR / AV28S2EKBL
A
V28S2EIGR / AV28S2EIBL
SERVICE ADJUSTMENTS
BEFORE STARTING SERVICE ADJUSTMENT
1. There are 2 ways of adjusting this TV: One is with the
REMOTE CONTROL UNIT and the other is the conventional
method using adjustment parts and components.
2. The setting (adjustment) using the REMOTE CONTROL
UNIT is made on the basis of the initial setting values. The
setting values which adjust the screen to the optimum
condition can be different from the initial setting values.
3. Make sure that connection is correctly made to AC power
source.
4. Turn on the power of the TV and measuring instrument for
warming up for at least 30 minutes before starting adjustment.
5. If the receive or input signal is not specified, use the most
appropriate signal for adjustment.
6. Never touch parts (such as variable resistors, transformers and
condensers) not shown in the adjustment items of this service
adjustment.
7. Preparation for adjustment (presetting):
Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT:
zSetting position
PICTURE MODE (VSM) NORMAL
SLEEP TIMER OFF
BALANCE CENTER
ECO OFF
ZOOM PANORAMIC
MEASURING INSTRUMENT AND FIXTURES
1. DC voltmeter (or digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator) [PAL / NTSC]
4. Remote control unit
ADJUSTMENT ITEMS
٨Checking items.
٨Adjustment of FOCUS.
٨IF circuit adjustment.
٨VSM preset setting.
٨VIDEO / CHROMA circuit adjustment.
٨DEFLECTION circuit adjustment.
٨H. BLANKING ADJUSTMENT.
٨AUDIO circuit adjustment. (Do not adjust)

A
V28S2EKGR / AV28S2EKBL
A
V28S2EIGR / AV28S2EIBL
BASIC OPERATION SERVICE MENU
1. TOOL OF SERVICE MENU OPERATION
Operate the SERVICE MENU with the REMOTE CONTROL UNIT.
2. SERVICE MENU ITEMS
With the SERVICE MENU, various settings (adjustments) can be made, and they are broadly classified in the following items of settings
(adjustments):
(1) 1. IF 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 This mode adjusts the setting values of the IF circuit.
(2) 2.V/C 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 This mode adjusts the setting values of the VIDEO / CHROMA circuit.
(3) 3.AUDIO 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 This mode adjusts the setting values of the multiplicity SOUND circuit.
(4) 4.DEF 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 This mode adjusts the setting values of the DEFLECTION circuit for each aspect mode given below.
REGULAR (50/60Hz)
PANORAMIC (50/60Hz)
14:9 ZOOM (50/60Hz)
16:9 ZOOM (50/60Hz)
16:9 ZOOM SUB TITLE (50/60Hz)
FULL (50/60Hz)
(5) 5.VSM PRESET 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 This mode adjusts the initial setting values of COOL,NOMAL and WARM.
(VSM : Video Status Memory)
(6) 6.VPS 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 This mode shows the monitor of the VPS and PDC.(Do not adjust).
(VPS : Video Program System, PDC : Program Delivery Code)
(7) 7.AUTO PROGRAM 㨯㨯㨯㨯㨯㨯㨯㨯㨯 By turning the power switch on, you can get the state of AUTO PROGRAM. (Do not adjust)
3. BASIC OPERATION OF SERVICE MENU
(1) How to enter SERVICE MENU
Press the INFORMATION key and the MUTING key of the
REMOTE CONTROL UNIT simultaneously, and the
SERVICE MENU screen of Fig. 1 will be displayed.
(2) Selection of SUB MENU SCREEN
Press one of keys 1㨪7 of the REMOTE CONTROL UNIT
and select the SUB MENU SCREEN (See Fig. 3), form the
SERVICE MENU.
SERVICE MENU ψSUB MENU
1. IF
2. V / C
3. AUDIO
4. DEF.
5. VSM PRESET
6. VPS
7. AUTO PROGRAM
Names of key
i
ii
i
ٕ
ٕ
ٕ
ٕ
INFORMATION
MUTING
FUNCTION UP/DOWN
MENU
FUNCTION -/+
key
OK
NEME OF REMOTE CONTOROL KEY
SERVICE MENU
1. IF 2. V/C
3. AUDIO 4. DEF
5. VSM PRESET 6. VPS
7. AUTO PROGRAM (OFF)
1-7 : SELECT : EXIT
Fi
g
.1
Fig.2
SERVICE MENU

A
V28S2EKGR / AV28S2EKBL
A
V28S2EIGR / AV28S2EIBL
SUB MENU 7. AUTO PROGRAM
(Do not adjust)
7. AUTO PROGRAM (OFF)
7. AUTO PROGRAM (ON)
COOL
NORMAL
WARM
1. BRIGHT
2. CONT.
3. COLOUR
4. SHARP
5. HUE
6. R DRIVE
7. B DRIVE
1. CUT OFF
2. DRIVE
3. BRIGHT
4. CONT.
5. COLOUR
6. HUE
7. BLACK OFFSET
8. SHARP (Do not adjust)
9. PURITY (Do not adjust)
1. CONC LIMIT
2. A2 ID THR
3. ALC
4. BASS
5. TREBLE
1. V-SHIFT
2. V-SIZE
3. SUBTITLE
4. H-CENT
5. H-SIZE
6. EW-PIN
7. TRAPEZ
8. EW.COR.L
9. EW.COR.H
10. V.S-COR
11. V-LIN
12. H-BLK-R
13. H-BLK-L
14. V-EHT(Do not adjust)
15. H-EHT(Do not adjust)
16. EHT-GAIN(Do not adjust)
Fig. 3 SUB MENU SCREEN
SERVICE MENU
SERVICE MENU
1. IF 2. V/C
3. AUDIO 4. DEF
5. VSM PRESET 6. VPS
7. AUTO PROGRAM (OFF)
1-7 : SELECT : EXIT
SUB MENU 5. VSM PRESET
VSM PRESET NORMAL
1.BRIGHT ***
- + : STORE : EXIT
OK
VCO (CW)
**
****
** .
..
.**
****
**
MHz
TOO HIGH
ABOVE REFERENCE
JUST REFERENCE
BELOW REFERENCE
TOO LOW
: EXIT
SUB MENU 6. VPS (Do not adjust)
VPS
VPS = 0000H(- - -)
PDC 8 / 30 / 1 = 0404H
: EXIT
V/C
1. CUT OFF (R) ****
(G) ****
(B) ****
- +
: STORE : EXIT
OK
SUB MENU 2. V/C
PAL
AUDIO
- + : STORE : EXIT
OK
SUB MENU 3. AUDIO (Do not adjust)
1. CONC LIMIT 0AH
C AD BITS = ********
DEF PANORAMIC
**
****
**
Hz
1. V-SHIFT ***
(**)
- +
: STORE : EXIT
OK
SUB MENU 4. DEF
SUB MENU 1.IF (VCO)

A
V28S2EKGR / AV28S2EKBL
A
V28S2EIGR / AV28S2EIBL
(3) Method of Setting
1) Method of Setting
1.IF
[VCO]
Ԙ1 Key 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 Select 1.IF.
ԙThe VCO (CW) screen will be displayed in yellow when the AFC voltage is at a certain level and in blue when it is at other levels.
ԚINFORMATION Key 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 Return to the SERVICE MENU screen.
2) Method of setting
2.V/C, 3.AUDIO, 4.DEF and 5.VSM PRESET.
Ԙ2㨪5 Key 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 Select one from 2. V/C, 3. AUDIO, 4. DEF and 5. VSM PRESET.
ԙFUNCTION UP/DOWN Key 㨯㨯㨯㨯㨯 Select setting items.
ԚFUNCTION -/+ 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 Set (adjust) the setting values of the setting items.
(Use the number keys of the REMOTE CONTROL UNIT for setting of WHITE BALANCE.
For the setting, refer to each item concerned.)
ԛMENU Key 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 Memorize the setting value.
(Before storing the setting values in memory, do not press the CH, TV, POWER ON / OFF key -
if you do, the values will not be stored in memory.)
ԜINFORMATION Key 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 Return to the SERVICE MENU screen.
3) Method of setting
6.VPS and 7.AUTO PROGRAM.
6.VPS 㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 This mode displayed monitor of VPS systems. (Do not adjust)
7.AUTO PROGRAM㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯㨯 When the MAIN POWER is turned on with the state of AUTO PROGRAM ON, you get a mode
that initializes every existing set value including language selection. Because this mode is set
at the factory upon completion of the adjustment, you need not to use it for service. (Do not
adjust in this mode.)
(4) Release of SERVICE MENU
1) After completing the setting, return to the SERVICE MENU, then again press the INFORMATION key.

AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
No.51777 No.51777 2-3 2-4
BLOCK DIAGRAM
EXT-1
EXT-2
EXT-3
IC101
AV SW
TV_V
AV SEL PWB
V/Y/C/L/R3
Y OUT
TU001
TUNER
C OUT
IC601
POWER
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SIDE
CONTROL
PWB (1/2)
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POWER & DEF PWB
L4/R4
FRONT CONTROL
PWB
MAIN PWB
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AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
No.51777 No.51777
2-5 2-6
CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM
MAIN PWB ASS'Y (1/2)
SJK-1911A-U2(AV28S2EKGR/EKBL)
SJK-1711A-U2(AV28S2EIGR/EIBL)
1911A-U2 1711A-U2
DIFFERENT LIST
V

AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
No.51777 No.51777 2-7 2-8
MAIN PWB ASS'Y (2/2)
SJK-1911A-U2
(AV28S2EKGR/EKBL)
SJK-1711A-U2
(AV28S2EIGR/EIBL)
1911A-U2 1711A-U2
DIFFERENCE LIST

AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
No.51777 No.51777
2-9 2-10
POWER & DEF PWB CIRCUIT DIAGRAM
POWER & DEF. PWB ASS'Y
SJK-2511A-U2
250
250
250
.0028
.011
1/4W
FR
QQH0089-002-I2
4.7 1/2W FR
16.9K
.047 AC275V

AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
No.51777 No.51777 2-11 2-12
AV SEL. PWB CIRCUIT DIARAM
AV SEL PWB ASS'Y
SJK0S911A-U2(AV28S2EKGR/EKBL)
SJK0S711A-U2(AV28S2EIGR/EIBL)
1.5

AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
No.51777 No.51777
2-13 2-14
FRONT CONTROL PWB CIRCUIT DIAGRAM SIDE CONTROL PWB CIRCUIT DIAGRAM
FRONT CTRL PWB ASS'Y
SJK-8511A-U2 SIDE CTRL PWB ASS'Y
SJK-8551A-U2

AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
AV28S2EKGR
AV28S2EKBL
AV28S2EIGR
AV28S2EIBL
No.51777 No.51777 2-15 2-16
CRT SOCKET PWB CIRCUIT DIAGRAM
CRT SOCKET PWB ASS'Y
SJK-3511A-U2