Goldstar KI-14U71 Schematic
LG KI-14U71/72X
General Information
Also Covers
LG KI-20U71/72X
PV-71A Chassis
Matrix
Item See Model Book
Servicing Precautions ....................................................................... LG DI-28Z12 7
Purity & Convergence ....................................................................... LG DI-28Z12 7
Recommended Safety Parts
Item Part No. Description
112 2055-V1221B CPT A48QAD220X 03N7ND (+0.4) 20”
150 150-D02M COIL, DEGAUSSING, CU 20” 60T 15OHM
153 153-276A DY DCAM1-20PLAA 20”
170 170-851B LEAD SET ASSY, CPT EARTH (L=640) 20”
P851 174-225E CORD ASSY, POWER UK, 224A
IC801 0ISK670700B IC, STR/S6707 (LF.953) 9P (R5R6)
IC802 0ISH123200B IC, PC123 FY2 PHOTO COUPLER
JC803 0ISH123200B IC, PC123 FY2 PHOTO COUPLER
D801 0DD110009DB DIODE, RM11CV 1.2A/1000V 100A
D802 0DD110009DB DIODE, RM11CV 1.2A/1000V 100A
D803 0DD110009DB DIODE, RM11CV 1.2A/1000V 100A
D804 0DD110009DB DIODE, RM11CV 1.2A/1000V 100A
C801 OCQZVBK002A C, POLYESTER A.C 275V 0.1UF M
C802 OCQZVBK002A C, POLYESTER A.C 275V 0.1UF M
C813 181-120E C, ACT 4KV E 222M FL10
F801 0FT3151B53C FUSE TIME LAG, 3151MA 250 V 5.2X20 CY/DE SEMK
F851 131-096E FUSE MICRO 125V 4.0A
F852 131-096E FUSE MICRO 125V 4.0A
F853 131-096E FUSE MICRO 125V 4.0A
L801 150-F06F COIL, LINE FILTER SQE2424 19MH
L802 150-F06H COIL, LINE FILTER SQE2930 30MH
T801 151-A04D TRANSFORMER, EER4445 STR6707
FR701 0RF0561H609 R, FUSIBLE 5.6 1/2W 5
FR702 0RF0470J607 R, FUSIBLE 0.47 1W 5%
FR704 0RF0101H609 R, FUSIBLE 1.0 1/2W 5
FR854 0RF0101J607 R, FUSIBLE 1 1W 5%
R813 180-C02H R, CARBON COMPOSITE RC 1/2W 8.2M K
SW851 140-289A SWITCH, SDDF3PASP013 (GS-ALPS) TV8
TH801 163-051A THERMISTOR J5 03 P5 3D 140M 290S
T701 6174Z-6001C FBT FTMPN11-T6001C 20”
2055-V0744D CPT A34KPU02XX 31N7ND (+0.4) 14”
150-002B COIL, DEGAUSSING, CU 14” 42T 5.7OHM
153-113V DY DCAD2-14SNAB 14”
170-851A LEAD SET ASSY, CPT EARTH (L=460) 14”
174-225K CORD ASSY, POWER UK, L4=100
6174Z-6001E FBT FTMPN11-T6001E 14”
Mechanical Parts
Item Part No. Description
A00 412-183C DECK ASSY D-27 P (2HD MONO VCR)
A01 413-312H DRUM ASSY V-2CH (PAL2CH)
A02 225-361A BASE ASSY P2
A03 225-364A BASE ASSY P3
A04 386-394A ARM ASSY CLEANER
A05 3B6-405A ARM ASSY T/UP
A06 4811R-0004A BRACKET ASSY L/D MOTOR
A07 340-195A HOLDER ASSY PINCH
A08 333-331A LEVER ASSY F/R
A09 435-435A GEAR ASSY P2
A10 435-437A GEAR ASSY P3
A12 4510R-0007A LEVER ASSY TENSION
A13 328-075A BAND ASSY TENSION
A20 219-023A HOUSING ASSY D27
A21 340-010A HOLDER ASSY CST
A22 321-672A BRACKET ASSY SIDE (R)
001 413-315E DRUM SUB ASSY (P1)
002 414-209B MOTOR ASSY DRUM GVD-027B ALPS
OR
002 414-217B MOTOR ASSY DRUM E20XL20
003 311-011A CHASSIS ASSY D27
004 225-362A BASE SUB ASSY P2
006 225-368A BASE DRUM
007 0225-371A BASE ASSY A/C
Mechanical Parts Cont'd
Item Part No. Description
008 523-833A HEAD FE HVFHU0010AK ALPS
010 225-365A BASE SUB ASSY P3
012 225-399A BASE ASSY BRUSH
013 386-395A ARM CLEANER
014 324-835B HOLDER ASSY CLEANER
015 386-392A ARM ASSY TENSION
020 442-640A SPRING TENSION
021 456-070A REEL S27
022 456-071A REEL T27
025 340-00BA HOLDER BAND (C)
026 4510R-0005A LEVER TENSION SSB
030 338-112B BRAKE ASSY SM (VF2025)
031 338-1140 BRAKE ASSY TM (VP2025)
032 442-655A SPRING MB
033 338-116A BRAKE ASSY TS
034 442-654A SPRING TS
035 316-019A BODY PRISM LED
036 257-071A PLATE UP
040 435-441A GEAR PINCH CAM
041 435-440A GEAR PINCH
042 435-439A GEAR CNT
043 386-404A ARM SUB ASSY T/UP
044 442-650A SPRING T/UP
045 321-669A BRACKET L/D MOTOR
046 414-199B MOTOR ASSY L/D
047 4422R-0001A WORM L/D MOTOR
048 437-020A WORM WHEEL
050 4261R-0002A ARM ASSY PINCH(D/C)
051 340-073A HOLDER SUB ASSY PINCH
052 225-374A BASE TENSION
053 333-332A LEVER F/R
054 442-645A SPRING F/R
055 442-649A SPRING PINCH
056 333-334A LEVER ASSY P2
057 386-398A ARM F/R
060 435-436A GEAR P2
061 442-647A SPRING P2
062 333-336A LEVER ASSY P3
063 435-438A GEAR P3
064 442-648A SPRING P3
065 435-442A GEAR P/S
066 3300R-0087A PLATE SLIDER
070 337-007B CLUTCH ASSY S27
071 337-008A CLUTCH ASSY T27
072 386-396A ARM ASSY IDLER
073 442-644A SPRING UP/D
074 434-173A ROLLER ASSY GUIDE
074 434-173C ROLLER ASSY GUIDE
075 4470R-0022A GEAR CAM L/D
076 556-252B SWITCH MODE S/W (D27), HMU0840-01, HOSI
077 435-432B GEAR PULLEY
080 442-656A SPRING H1
081 435-443A GEAR H1
082 333-339A LEVER H1
083 435-444A GEAR H-2
084 414-201B MOTOR GVC-027B CAPSTAN D-27 ALPS
085 321-696A BRACKET CAPSTAN, D27
086 452-062A BELT CAPSTAN
090 4810R-0043A BRACKET CAM (B/T)
091 333-333A LEVER JOG
092 435-434A GEAR JOG
093 442-646A SPRING JOG
094 338-110A BRAKE ASSY CAP
095 333-338A LEVER TAB
096 442-652A SPRING TAB
100 257-072A PLATE TOP
101 386-407A ARM ASSY F/L
102 340-011A HOLDER SUB ASSY CST
103 321-671A BRACKET HOLDER (R)
104 333-341A LEVER STOPPER (R)
105 465-039A OPENER LID
106 386-410A ARM RELEASE
110 442-660A SPRING RELEASE
111 442-659A SPRING STOPPER
112 477-058A RUBBER GRIP
113 321-673A BRACKET SUB ASSY (R)
114 435-445A GEAR CAM F/L
115 435-446A GEAR CONNECT
116 435-447A GEAR WORM
120 333-342A LEVER SWITCH
121 442-661A SPRING SWITCH
122 257-074A PLATE COVER
123 384-143A GUIDE CST
OR
123 384-151A GUIDE CST27
126 465-040A OPENER DOOR
130 257-075A PLATE GROUND
131 340-062A HOLDER ASSY PRISM
401 1MPK0261418 PAN HEAD MACHINE SCREW +, - D2.6 L4.0 MSWR3/FZY
405 1MDC0262818 PAN HEAD MACHINE SCREW P/WASH+ D2.6 L12 MSWR3/FZY
406 1MEC0302018 PAN HEAD MACHINE SCREW S/W+ D3.0 L6.0 MSWR3/FZY
408 1MBC0302418 BINDING HEAD MACHINE SCREW + D3.0 L8.0 MSWR3/FZY
411 353-046B SCREW SPECIAL (3X8 FZMY)
421 1MPC0302618 PAN HEAD MACHINE SCREW +! D3.0 L10.0, MSWR3/FZY
426 1MPC0302018 PAN HEAD MACHINE SCREW +! D3.0 L6.0 MSWR3/FZY
427 353-054B SCREW MINIATURE
428 353-221A SCREW M3-L15
500 354-080F WASHER STOPPER
504 354-001B WASHER P.S D3.1XD6X0.5T
511 354-080C WASHER STOPPER D26XD5X0.5T
518 354-128A WASHER STOPPER D1.7XD4.5X0.5T
519 354-128B WASHER STOPPER D2.5XD9X0.5T
Adjustments
Notes;
(Adjustments must be performed by the
following procedures)
1. It is recommended that an isolation transformer be used when servicing this chassis to
prevent electric shock and damage to test
equipment.
2. The ac line voltage must be maintained at
230 vac, +- 10%, 50/60 hz.
3. Prior to making any adjustments, the receiver
must be operated for 10 minutes.
1. DECK ADJUSTMENT
1. Deck Transit System Adjustment
1-1. Necessary Instruments
1) TAPE for SP (4HD), Normal (2HD)
2) Oscilloscope
3)10:1 Probes 2EA
4) Adjustment Driver
(P2, P3, X-distance (NUT), Audio (NUT)
control)
5) RMS Meter (Audio Level Meter)
1-2. Preliminary Steps
1) Connect CH 1 of the oscilloscope to J439 (H/
SW) on the main PCB. Trigger on this
channel.
2) Connect CH 2 of the oscilloscope to J218
(RF) on the main PCB. Monitor this waveform
when preceding with step 4.
3) Play an alignment tape.
4) When the auto Trk caption appears on
screen, press the TRK up (+) button on the
RCU to initialize the manual tracking feature.
5) If manual tracking differs from auto tracking,
precede with steps 1-3 (RF Linearity) and 1-4
(X-Distance Adj.).
1-3. RF linearity check and adjustment
1) Adjust P2 & P3 so that the RF ENVELOPE
waveform is maximum and stabilized.
2) Check if the ENVELOPE waveform is at its
maximum size by pressing TRK UP(+) and
DOWN (-) button one step.
1-4. X-Distance Adjustment
1) Turn the Cone Screw of the DECK left or right
so that the HF waveform is maximum.
2) Check if the RF waveform satisfies the
linearity by pressing TRK UP (+) and DOWN
(-) button one step.
CAUTION: If the RF waveform becomes
maximum with the Cone Screw more than 2
turns, its out of adjustment. (2 turns; 720O)
1-5. Audio Level Check and Adjustment
1) Connect “+” terminal of RMS Meter (Audio
Level Meter) to J233 on MAIN PCB AUDIO
OUT and “-” terminal to GND, respectively.
2) Play the 1khz and 7khz segments on the
alignment tape and confirm if the spec is meet
in item #3. If not adjust the azimuth screw to
meet this spec.
3) Audio Level Spec: 1KHz; 0.5 ± 0.1Vrms
6KHz; 1K ± 1.5dB
2. CIRCUIT ADJUSTMENT
1. PG Adjustment
1-1. Necessary Instruments
1) Alignment tape SP
2) Oscilloscope
3) 10 :1 Probe
1-2.Adjustment
1) PLAY exclusive use of SP tape. (2HD:
NORMAL TAPE)
2) Connect CH 1 of the Oscilloscope to J439 (H/
SW) on the MAIN PCB and VOL/DIV to 1V
Range and Trigger the Oscilloscope.
3) Connect CH 2 of the oscilloscope to J454
(Video Out) on the main PCB and set the
VOL/DIV to 500mV Range.
4) Set TIME/DIV of oscilloscope to 50 us Range.
5) Adjust VR01 so that V-sync Falling Edge of
Video signal become 412usec ± 20usec.
2. Normal REC Bias Level Adjustment
2-1. Necessary Instruments
1) Blank tape for Recording
2) RMS Meter
2-2. Adjustment
1) Set the TV/VCR to A/V input mode.
2) Insert a tape and press REC button.
3) Connect RMS Meter’s (+), (-) to R401 on
MAIN PCB.
4) Adjust VR401 so that the RMS Meters
indicator become within 2.6mV ± 0.05mV.
3. Focus Voltage Adjustment
1) Receive the cross hatch pattern.
2) Press the PICTURE button to set the
Standard ON condition.
3) Adjust Focus control knob so that the focus of
center & circumference to be best.
4. Screen Adjustment
1) Press TV/AV button and select AV mode.
2) Adjust SCREEN control until the retrace line
is visible and return until the retrace line is
invisible.
How to get into SVC mode when you don’t
have SVC Remote Controller.
Push the “0K” Key on the user’s Remote
Controller and local “0K” button at the same
time.
5. VCO Adjustment
1) Select channel 0.
2) Input PAL Digital pattern (175.25MHzI.
LG KI-14U71/72X
Adjustments Cont’d
3) Press SVC Key on the Service Remote
Controller to get into SVC mode and press PR
+/- Key to select VCO.
4) Press VOL +/- Key until OK is displayed on
the screen.
6. LCO Adjustment
1) Select channel 99.
2) Input SECAM-L’ pattern (55.75MHz).
3) Press SVC Key on the Service Remote
Controller to get into SVC mode and Press
PR +/- Key to select LCO.
4) Press VOL +/- Key until OK is displayed on
the screen.
7. RF AGC Adjustment
1) Input PAL DIGITAL PATTERN.
2) Connect DMM to AGC (J232) test point on
the Main PCB.
3) Press SVC Key on the Service Remote
Controller to get into SVC mode and press PR
+/- Key to select AGC.
4) Press VOL +/- Key until DMM reads the data
on the table.
Note: When adjusting 2 TUNER Model, select
BOOSTER OFF from MENU.
8. White Balance Adjustment
1) Input a signal which lower half is black and
upper half is white.
2) Set the picture at standard on.
3) Press SVC Key on the Service Remote
Controller to get into Service mode.
4) Press PR ±/- Key to select BG, RG.
Press VOL +/- Key until X=281±3, Y=288±3.
GG is fixed data at 32 so, do not adjust GG
data.
9. Deflection Data Adjustment
1) Input PAL Digital Pattern.
2) Press SVC Key on the Service Remote
Controller and select LINE SERVICE 2 mode.
3) Press PR ±/- Key to select an adjustment
mode.
4) Press VOL +/- Key to adjust data.
5) Vertical SLOPE adjustment
i) Select V-SLP mode with PR +/- Key.
ii) Press VOL +/- Key until the horizontal center
line of the large circle coincides with Blanking
Line.
6) Vertical amplitude adjustment
i) Select V-AMP mode with PR +/- Key.
ii) Press VOL +/- Key until the upper and lower
end of the large circle reach 5 mm inside from
the effective area of CPT.
7) Vertical Shift Adjustment
i) Select V-SFT mode with PR +/- Key.
ii) Press VOL +/- Key until the horizontal center
coincides with the vertical sign slot mark of
CPT.
8) Horizontal Shift Adjustment
i) Select H-SFT mode with PR +/- Key.
ii) Press VOL +/- Key until the vertical center
coincides with the horizontal sign slot mark of
CPT.
9) Vertical S-Correction Adjustment
i) Select S-COL mode with PR +/- Key.
ii) Press VOL +/- Key until the grid of Cross
Hatch Pattern is even all over the screen.
Fault Finding Guides (TV)
LG KI-14U71/72X
Fault Finding Guides (VCR)
LG KI-14U71/72X
Exploded Parts Views
(See Parts List)
CRT Diagram (14”)
Main Diagram (2) Table
LG KI-14U71/72X
AV S/W Diagram
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