LG RCT689H User manual

VCR+DVD RECORDER
SERVICE MANUAL
MODEL: RCT689H
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: RCT689H
SERVICE MANUAL
Website http://biz.lgservice.com
Internal Use Only
P/NO : AFN32896765 FEBRUARY, 2011

1-1
CONTENTS
SECTION 1 ........ SUMMARY
SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
SECTION 4 ........ MECHANISM OF VCR PART(D-37)
SECTION 5 ........ RV9 LOADER PART
SECTION 6 ........ REPLACEMENT PARTS LIST

1-2
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR
VCR+DVD RECORDER PRODUCTS .................................................................................................. 1-3
SERVICING PRECAUTIONS................................................................................................................... 1-4
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SERVICE INFORMATION FOR EEPROM IC SETTING................................................................. 1-5
UPGRADE THE MAIN & LOADER PROGRAM................................................................................ 1-6
UPGRADING I/O μ-COM SOFTWARE................................................................................................. 1-8
SPECIFICATIONS ....................................................................................................................................... 1-9

1-3
PRODUCT SAFETY SERVICING GUIDELINES FOR
VCR+DVD RECORDER PRODUCTS
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original design be
modified or altered without permission from LG Corporation. All components should
be replaced only with types identical to those in the original circuit and their physical
location, wiring and lead dress must conform to original layout upon completion of
repairs.
Special components are also used to prevent x-radiation, shock and fire hazard.
These components are indicated by the letter “x” included in their component desig-
nators and are required to maintain safe performance. No deviations are allowed
without prior approval by LG Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes into the
set is not delayed until the new service literature is printed.
CAUTION : Do not attempt to modify this product in any way. Never perform cus-
tomized installations without manufacturer’s approval. Unauthorized modifications
will not only void the warranty, but may lead to property damage or user injury.
Service work should be performed only after you are thoroughly familiar with these
safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended to alert
the service personnel to important safety information in the service
literature.
The lightning flash with arrowhead symbol within an equilateral trian-
gle is intended to alert the service personnel to the presence of non-
insulated “dangerous voltage” that may be of sufficient magnitude to
constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equilat-
eral triangle is intended to convey to the service personnel the follow-
ing fuse replacement caution notice:
CAUTION : FOR CONTINUED PROTECTION AGAINST RISK OF
FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock. After
the original service problem has been corrected, make a check of the following:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent
component shorts. This is especially important on items trans-ported to and from
the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields, strain
reliefs, power supply cords, and other hardware have been reinstalled per the
original design. Be sure that the safety purpose of the polarized line plug has not
been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign particles.
4. Check for physical evidence of damage or deterioration to parts and components,
for frayed leads or damaged insulation (including the AC cord), and replace if
necessary.
5. No lead or component should touch a high current device or a resistor rated at 1
watt or more. Lead tension around protruding metal surfaces must be avoided.
6. After reassembly of the set, always perform an AC leakage test on all exposed
metallic parts of the cabinet (the channel selector knobs, antenna terminals,
handle and screws) to be sure that set is safe to operate without danger of electri-
cal shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS
TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the
following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd
150V AC type capacitor between a known good earth ground water pipe, conduit,
etc.) and the exposed metallic parts, one at a time. Measure the AC voltage
across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the
AC plug by using a non-polarized adaptor and repeat AC voltage measurements
for each exposed metallic part. Voltage measured must not exceed 0.75 volts
RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit consti-
tutes a potential shock hazard and must be corrected immediately.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf
space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations where dew
is a factor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer should
also avoid the use of decorative scarves or other coverings that might obstruct
ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit must follow
the factory-approved mounting instructions. A product mounted to a shelf or
platform must retain its original feet (or the equivalent thickness in spacers) to
provide adequate air flow across the bottom. Bolts or screws used for fasteners
must not touch any parts or wiring. Perform leakage tests on customized installa-
tions.
5. Caution customers against mounting a product on a sloping shelf or in a tilted
position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small casters
across thresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that a forest of exten-
sions, sprouting from a single outlet, can lead to disastrous consequences to
home and family.

1-4
SERVICING PRECAUTIONS
CAUTION: Before servicing the VCR+DVD RECORDER
covered by this service data and its supplements and
addends, read and follow the SAFETY PRECAUTIONS.
NOTE: if unforeseen circumstances create conflict between
the following servicing precautions and any of the safety
precautions in this publications, always follow the safety pre-
cautions.
Remember Safety First :
General Servicing Precautions
1.Always unplug the VCR+DVD RECORDER AC power cord
from the AC power source before:
(1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2) Disconnecting or reconnecting any internal electrical
plug or other electrical connection.
(3) Connecting a test substitute in parallel with an electro-
lytic capacitor.
Caution : A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2.Do not spray chemicals on or near this VCR+DVD
RECORDER or any of its assemblies.
3.Unless specified otherwise in this service data, clean elec-
trical contacts by applying an appropriate contact cleaning
solution to the contacts with a pipe cleaner, cotton-tipped
swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication
of contacts is not required.
4.Do not defeat any plug/socket B+ voltage interlocks with
whitch instruments covered by this service manual might
be equipped.
5.Do not apply AC power to this VCR+DVD RECORDER
and / or any of its electrical assemblies unless all solidstate
device heat sinks are correctly installed.
6.Always connect the test instrument ground lead to an
appropriate ground before connecting the test instrument
positive lead. Always remove the test instrument ground
lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter
(500V)
to the blades of the attachment plug. The insulation resist-
ance between each blade of the attachment plug and acces-
sible conductive parts (Note 1) should be more than
1Mohm.
Note 1 : Accessible Conductive Parts include Metal panels,
Input terminals, Earphone jacks,etc.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field
effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.
1.Immediately before handling any semiconductor compo-
nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commer-
cially available discharging wrist strap device, which should
be removed for potential shock reasons prior to applying
power to the unit under test.
2.After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3.Use only a grounded-tip soldering iron to solder or unsol-
der ES devices.
4.Use only an anti-static solder removal device. Some solder
removal devices not classified as “anti-static” can generate
electrical charges sufficient to damage ES devices.
5.Do not use freon-propelled chemicals. These can generate
an electrical charge sufficient to damage ES devices.
6.Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum
foil,or comparable conductive material).
7.Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
Caution: Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
8.Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static elec-
tricity sufficient to damage an ES device.)

1-5
SERVICE INFORMATION FOR EEPROM IC SETTING
1. Press both “CLEAR” button on the Remocon and “ OPEN/CLOSE” button on the Front Panel about ±5
sec.
The picture on OSD will be as bellow :
2. To MOVE from OP1 (Option 1) to another option, press button on the Remote Control.
3. To CHANGE the option code, press button on the Remote Control.
4. To APPLY the option Code, after change the option press OK/Enter button on Remote Control.
5. To INITIALIZE the system, press “CLEAR” button on the R/C together with “ OPEN/CLOSE” on the Front
Panel about ±5 sec.
Note : This process will only clear the mapping channel and not delete data on HDD.
6. To exit from the option Code menu without Initialize the system, just turn off the power and then turn on
again.
OP1 : 0F 00000000
OP2 : 70 00000000 071102A
OP3 : 31 00000000
OP4 : 20 00000000
OP5 : 0A 00000000
OP6 : AA 00000000
OP7 : 44 00000000 Write : OK
OP8 : 05 00000000 Exit:MP
OP9 : EC 00000000 Move : < >
OPA : 00 00000000 Edit:
5
Checksum of Option : 0x1105
DVD read time : --- second
CD read time : 10 sec -- > OK

1-6
UPGRADE THE MAIN & LOADER PROGRAM
1. MAKING UPGRADE DISC MAIN SW AND
LOADER SW
1) Do Physical format as ISO9660 or JOLIET file
system
2) Don’t care about the CD Volume label
3) Write Main SW file and Loader SW file on
Root
Main SW file name is :
- LG_RC600_UPDATE_PAL.ROM
Loader SW file name is :
- DvdS620.rs6
- YASMS620
2. UPGRADE MAIN S/W
1) Insert Upgrade DISC into the Set
2) Press “DVD” button on the Remocon
3) After Disc Reading, CD Data Inspection Process.
OSD like below :
4) If CD Data inspection OK, there will be mes-
sage on OSD as below :
5) Press “PLAY” button to update S/W and another
button to cancel.
6) Main S/W under updated.
Do not turn off the power during updating proc-
ess...!
7) If updating succeed, tray disc will be opened.
Take the disc and turn off the power.
8) Turn on the power, and check the Main S/W
Version.
3. UPGRADE LOADER S/W
1) Insert Upgrade DISC into the Set
2) Press “DVD” button on the Remocon
3) After Disc Reading, CD Data Inspection Process.
OSD like below :
4) If CD Data inspection OK, there will be message
on OSD as below :
And Disc tray will be opened. Take off the disc

1-7
5) Press “PLAY” button to update S/W and another
button to cancel.
6) Loader S/W under updated.
Do not turn off the power during updating proc-
ess...!
If updating succeed, after completed there will
be message :
Power will be automatically turn off.
7) Turn on the power and check the Loader S/W
Version.
4. S/W VERSION INFORMATION
1) Press the “HOME” button on the Remocon
2) Select “EASY MENU” --> Select “SETUP”
3) Select menu
'General -> TV Aspect -> 16:9 Wide'
4) Press button number 1 - 3 -9 - 7 - 1 - 3 - 9 -
Enter on the Remocon
The picture on TV screen as below :

1-8
UPGRADING I/O μ-com SOFTWARE
1. MAKING UPGRADE CD
1) Prepare “io_micom_update.hex” File.
2) Make Data CD with Your Burning Tool.
2. UPGRADING SEQUENCE
1) Insert Your Upgrading CD.
2) There will be displayed Update Disc OSD and Request Pressing Play Key. Then Press Play Key!
---> If Displayed CD Data Inspection Fail Message, Loader does not Read CD Data. So, Insert Again CD
or Burn Other CD(have no defect).
3) Progressing OSD will be displayed. And Current Version and New Version Number will be displayed after
a while.
Tray will be Opened automatically. Removed Update disc.
Also, request pressing Play Key. Then Press Play Key!
4) Upgrading Progress will be displayed.
5) If Upgrading Progress Succeed, Turn Off Power automatically.
6) When You Turn On Power after a while, Recorder will be Start New Version Program.
* After Upgrading Program, Turn Off Power And Re-Start Recorder.
New Program will be applied At That Time. Please Don’t Forget.

1-9
SPECIFICATIONS
• GENERAL
Power requirements AC 200 ~ 240V, 50/60Hz
Power consumption 23W
Dimensions (approx.) 430 X 78.5 X 260mm (w x h x d) without foot
Net weight (approx.) 4.2kg
Operating temperature 5°C to 35°C
Operating humidity 5% to 90 %
Television system PAL B/G, SECAM D/K, color system
Recording format PAL
• RECORDING
Recording format DVD Video Recording, DVD-VIDEO
Recordable media DVD-RW, DVD-R, DVD+RW, DVD+R,
Recordable time DVD (4.7GB): Approx. 1 hour (XP mode), 2 hours (SP mode),
4 hours (LP mode), 6 hours (EP mode), 14 hours (MLP mode)
Video recording format
Sampling frequency 27MHz
Compression format MPEG2 (VBR supported)
Audio recording format
Sampling frequency 48kHz
Compression format Dolby Digital
• PLAYBACK
Frequency response DVD (PCM 48kHz): 8Hz to 22kHz,
CD: 8Hz to 20kHz
DVD (PCM 96kHz): 8Hz to 44kHz
Signal-to-noise ratio More than 100dB (AUDIO OUT connector)
Harmonic distortion Less than 0.008% (AUDIO OUT connector)
• INPUTS
Dynamic range More than 95dB (AUDIO OUT connector)
ANTENNA IN Antenna input, 75 ohms
VIDEO IN 1.0Vp-p 75 ohms, sync negative, RCA jack x 2
AUDIO IN 2.0Vrms more than 47 kohms, RCA jack (L, R) x 2
DV IN 4 pin (IEEE 1394 standard)
• OUTPUTS
VIDEO OUT 1Vp-p 75Ω, sync negative, SCART x 2
COMPONENT VIDEO OUT (Y) 1.0V(p-p), 75Ω, sync negative, RCA jack x 1,
(PB)/(PR) 0.7V(p-p), 75Ω, RCA jack x 2
Audio output (digital audio) 0.5V(p-p), 75Ω, RCA jack x 1
Audio output (optical audio) 3V(p-p), 75Ω, Optical connector x 1
Audio output (analog audio) 2.0Vrms (1kHz, 0dB), 600Ω,
RCA jack (L, R) x 1 / SCART x 2

1-10
MEMO

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS..................................................................................................................................... 2-2
1. CABINET AND MAIN FRAME SECTION ................................................................................................. 2-2
2. DECK MECHANISM SECTION [RV9(DR-11A)]....................................................................................... 2-3
3. DECK MECHANISM SECTION (D37(N)) ................................................................................................. 2-4
4. PACKING ACCESSORY SECTION ......................................................................................................... 2-7

2-2
469
272
SMPS
BOARD
A47
469
A00
470
457
457
300
250
462
462
465
330
320
260
261
261
261
465
284
286
285
281
275
469
472
274
VCR BOARD
469
469
469
323
A46
A
CABLE8
C
D
A50A50
A
KEY
BOARD
280
463
C
D
B
F
DVD & LOADER
BOARD
CABLE6
CABLE5
CABLE4
HDMI
BOARD E
E
F
CABLE7
A54
A54A
253
A43
452
B
469
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION
469
283
A44

2-3
2. DECK MECHANISM SECTION [RV9(DR-11A)]
Main C.B.A
1018
10191045
1431
1437
1025
1432
1432
A006
1002
A001
A52
1020
1439
1046
1047
1011
1013
1017
1433
1026
1016
1015
1012
1030
1038
1432
1036
1001
1003
DVD & LOADER
BOARD
CABLE6
CABLE5
1043
1041
1041
A005

2-4
3. DECK MECHANISM SECTION (D37(N))
3-1. Front loading mechanism section
100
A21
A23
A24
032
109
A22
054A
054
115
116
110
112 113 114
103 105
102
106
107

2-5
3-2. Moving mechanism section (1)
008
011
031
079
017
032
024
406
031
021
028
029
026
A03
027
022
003
004
006
007
014
015
009
409
013
016
012
OPTIONAL PART
A01
405

2-6
3-3. Moving mechanism section (2)
052
517
061
056
518
052A
055
410
032
077
076
078
060
051
064
A11
A12
067 066
065
068
069
070
023
080
058

2-7
4. PACKING ACCESSORY SECTION
BATTERY
808
BAG
804
PACKING
803
806 CABLE(COAXIAL)
BOX CARTON
802
PACKING
803
801 INSTRUCTION ASSEMBLY
REMOCON
900

2-8
MEMO

3-1
SECTION 3
ELECTRICAL
CONTENTS
OVERALL WIRING DIAGRAM...................3-2
VCR PART
ELECTRICAL
ADJUSTMENT PROCEDURES .................3-3
1. SERVO ADJUSTMENT ...............................3-3
VCR ELECTRICAL
TROUBLESHOOTING GUIDE....................3-4
1. POWER (SMPS) CIRCUIT ..........................3-4
2. SYSTEM/KEY CIRCUIT...............................3-8
3. SERVO CIRCUIT .........................................3-9
4. Y/C CIRCUIT..............................................3-11
5. HI-FI CIRCUIT............................................3-13
6. TUNER/IF CIRCUIT ...................................3-14
WAVEFORMS................................................3-16
1. AUDIO BLOCK
(WHEN 1kHz SIGNWAVE IS OUTPUT) ....3-16
BLOCK DIAGRAMS ....................................3-19
1. POWER (SMPS) BLOCK DIAGRAM.........3-19
2. SYSTEM BLOCK DIAGRAM .....................3-21
3. A/V CODEC BLOCK DIAGRAM ................3-23
4. HI-FI BLOCK DIAGRAM ............................3-25
5. AVCP BLOCK DIAGRAM ..........................3-27
6. TUNER BLOCK DIAGRAM........................3-29
7. VIDEO SIGNAL BLOCK DIAGRAM...........3-31
8. AUDIO SIGNAL BLOCK DIAGRAM ..........3-33
CIRCUIT DIAGRAMS ..................................3-35
1. POWER (SMPS) CIRCUIT DIAGRAM ......3-35
2. TUNER CIRCUIT DIAGRAM .....................3-37
3. AVCP CIRCUIT DIAGRAM........................3-39
4. HI-FI CIRCUIT DIAGRAM..........................3-41
5. SYSTEM CIRCUIT DIAGRAM...................3-43
6. I/O MICOM CIRCUIT DIAGRAM ...............3-45
7. I/O JACK CIRCUIT DIAGRAM...................3-47
8. HDMI CIRCUIT DIAGRAM
(HDMI MODEL ONLY)...............................3-49
9. VIDEO/AUDIO CODEC, MSP
CIRCUIT DIAGRAM...................................3-51
10. KEY CIRCUIT DIAGRAM...........................3-53
• CIRCUIT VOLTAGE CHART ...................3-55
PRINTED CIRCUIT BOARD
DIAGRAMS.....................................................3-61
1. VCR P.C.BOARD.......................................3-61
2. SMPS P.C.BOARD ....................................3-65
3. HDMI P.C.BOARD .....................................3-65
4. KEY P.C.BOARD ......................................3-67
VDR PART
VDR ELECTRICAL
TROUBLESHOOTING GUIDE..................3-71
1. NO COMPONENT VIDEO SIGNAL
WHEN PLAYING DISC..............................3-71
2. NO COMPOSITE SIGNAL
WHEN PLAYING DISC..............................3-72
3. NO TV, EXTERNAL INPUT
VIDEO SIGNAL..........................................3-73
4. WHEN PLAYING DISC,
NO AUDIO OUTPUT (IN VCR BOARD)....3-74
5. NO OPTICAL/DIGITAL OUTPUT...............3-75
6. SYSTEM CIRCUIT PART (DISPLAY
“HELLOW” ON THE WINDOW).................3-76
WAVEFORMS................................................3-77
1. SYSTEM BLOCK .......................................3-77
2. DV BLOCK (TPA±, TPB±) .........................3-79
3. USB BLOCK (D±) ......................................3-80
BLOCK DIAGRAMS ....................................3-81
1. VDR SET TOTAL BLOCK DIAGRAM........3-81
2. VDR MAIN H/W BLOCK DIAGRAM ..........3-83
3. DVD POWER BLOCK DIAGRAM..............3-85
4. AUDIO IN/OUT BLOCK DIAGRAM ...........3-87
5. VIDEO IN/OUT BLOCK DIAGRAM............3-89
6. DV1394, USB BLOCK DIAGRAM..............3-91
CIRCUIT DIAGRAMS ..................................3-93
1. MPEG CIRCUIT DIAGRAM .......................3-93
2. DDR, LATCH, FLASH, RESET
CIRCUIT DIAGRAM...................................3-95
3. DV1394, INTERFACE CON
CIRCUIT DIAGRAM...................................3-97
4. RF IC, MOTOR DRIVE IC
CIRCUIT DIAGRAM...................................3-99
5. DSP CIRCUIT DIAGRAM ........................3-101
• CIRCUIT VOLTAGE CHART ...............3-103
PRINTED CIRCUIT BOARD
DIAGRAMS...................................................3-105
1. VDR & LOADER P.C.BOARD .................3-105