LG MT- 42PZ12 Service Manual page 10

If the deviation of High Light occur, operate the adjustment
of Low Light and High Light again.
(Expectation average adjustment data : B-Cut & R-
Cut=6±2, R-Gain/G-Gain=25±3)
(7) Exit adjustment mode using A/V button.
6. Adjustment of AFT-VCO COIL
6-1. Preparation for Adjustment
(1) Connect the equipment for measuring as below.
(2) Setting equipment for measuring.
RF Signal generator
System ADJ.Point
B/G,D/K/I,SECAM-L X106
SECAM-L' VR101
V Multimeter or Oscilloscope
ST-BY 5V:P001
5V
TP112(IF VCC)
TP103
Power-
X106
Supply
5V
(VCO)
4.7 Kohm
VR101
S3
Q110
TP111
S2
100 ohm
* Output of Power Supply = DC 5V
* Oscilloscope range = set 0.5V/div., 5msec/Div.(using scope)
6-2. Adjustment 38.9MHz IF(B/G, D/K, I, L, M)
(1) Input the signal of the signal generater(38.9MHz) to
TP105(IC102 pin 7) through 0.01uF(103) capacitor.
(2) S1 : OFF, S2 : ON, S3 : OFF
(3) Adjust voltage of the TP103 to 2.5
X106.
6-3 Adjustment L VCO(Adjustment
SECAM-L ) --> Only SECAM L model
(1) After changing the signal of the signal generater to
34.25MHz, input the signal to TP102(IC102 pin 11) through
0.01uF(103) capacitor.
(2) S1 : ON, S2 : OFF, S3 : ON
(3) Adjust voltage of the TP103 to 2.5
VR101.
7. Adjustment AGC
7-1 Preparation for Adjustment
(1) Connect the signal of PAL-B/G 05ch. to Antenna jack.
(2) Connect Multi meter to point(J150) of AGC adjustment.
7-2 Adjustment
Adjustment the voltage of Multi meter to 2.4
changing VR102.
Frequency
Modulation
38.9
OFF
34.25
OFF
1
IC102
TDA4474
0.01uF
24
TP105
7
38.9MHz
34.25MHz
11 TP102
VR102(AGC)
13
TP110
16 15
100 ohm
S1
(STB MAIN)
0.1V by adjusting
0.1V by adjusting
8. OPTION TABLE
8-1 Funtion of Line Service
(1) • Enter to SVC mode by using SVC button on the remote
control.
•To enter to the SVC mode,press the "OK" button on RZ-
BA10 local key ond "OK" button on the remote control
simultaneously.
• In MZ-42PZ10 only,press the "INPUT" button and "OK"
button on remote control to enter to SVC mode.
(2) Select the item by using the Quick View(Yellow) button.
(3) After adjusting,restore adjusted item in EEPROM by using
"OK" button and use the CYAN button to cancel the
Level
adjusted condition.
80dBuV
(4) Select the program directly and input the data of option by
using the number button.
80dBuV
(5) Line SVC-0(Hitrun&W/B Adj.mode)=> VSC EEPROM
• H/T RUN:OFF,WHITE,RED,GREEN,BLUE,OFF
• A/C SRT:Auto Cutoff
• R/G/B Fine 16,R/G/B Gain 3,R/G/B Cutoff 100
(6) Line SVC-1(Phase&Position Adj.mode)=> VSC EEPROM
• Phase 15,H-Pos 32,V-Pos 32,Auto Position
(7) VSC CXA2101 Adj.mode)=> VSC EEPROM
(B/G,D/K,I,L)
BC 7
(SECAM-L')
RC 7
RG 10
GG 10
BG 10
SUB-CON 3
SUB-BRI 49
(8) STB CXA2101 Adj.mode)=> STB EEPROM
BC 7
RC 7
RG 31
GG 31
BG 31
SUB-CON 3
SUB-BRI 50
(9) SOUND Adj.mode => VSC EEPROM
FP
NP
SP
SC VOL
0.1V by
TB VOL
- 10 -
SUB-COL 15 GYB 5
ST 7 GMM 5
SUB-SHP 1 BLK 15
CTI 0 PRE 1
RYR 6 DCT 1
GYR 10 DPI 2
RYB 9 VTC 2
HWI 2
SUB-COL 0 GYB 5
SUB-HUE 14 GMM 0
SUB-SHP 0 BLK 15
CTI 1 PRE 1
RYR 6 DCT 0
GYR 10 DPI 0
RYB 9 VTC 2
HWI 2
MT-42PZ12
14
80
25
83
118
DCO 1
HDT 0
SFO 1
DCO 0
HDT 0
SFO 1
CON 23
BRI 31
COL 31
HUE 31
SHP 35
MZ-42PZ12
28
120
25
68
115