LG DC593W User manual

CONTENTS
SECTION 1 . . . .SUMMARY
SECTION 2 . . . .CABINET & MAIN CHASSIS
SECTION 3 . . . .ELECTRICAL
SECTION 4 . . . .MECHANISM
SECTION 5 . . . .REPLACEMENT PARTS LIST

SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ........................... 1-3
SERVICING PRECAUTIONS .................................................................................................. 1-4
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SPECIFICATIONS ...................................................................................................................... 1-5
LOCATION OF CUSTOMER CONTROLS ........................................................................................1-6

1-3
Prior to shipment from the factory, the products are strictly inspected to conform with the recognized product
safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such com-
pliance, it is equally important to implement the following precautions when a set is being serviced.
•Precautions during Servicing
1. Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and
certain parts of the product. When performing service, be sure to read and comply with these and other
cautionary notices appearing in the operation and service manuals.
2. Parts identified by the symbol and shaded (
Y ) parts are critical for safety.
Replace only with specified part numbers.
Note : Parts in this category also include those specified to comply with X-ray emission standards for
products using cathode ray tubes and those specified for compliance with various regulations
regarding spurious radiation emission.
3. Use Specified internal wiring. Note especially:
1) Double insulated wires
2) High voltage leads
4. Use specified insulating materials for hazardous live parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers
4) Insulation sheets for transistor
5. Observe that wires do not contact heat producing
parts (heatsinks, oxide metal film resistors, fusible
resistors, etc.)
6. Check that replaced wires do not contact sharp edged
or pointed parts.
7. 1) When a power cord has been replaced, check
that A mark is made on the cord, under strain,
near the aperture, and the flexible cord is
subjected 100 times to a pull of 40N for a duration
of 1 second each.
2) During the test, the cord shall not be displaced by
more than 2mm
8. Also check areas surrounding repaired locations.
9. The internal wiring is secured so as not to approach the heating parts and high voltage parts by its shape.
So, these wires must be restored to its former state.
IMPORTANT SAFETY PRECAUTIONS
Fig. 1
Power Code
or Power Cord

1-4
Fig. 3
SAFETY CHECK AFTER SERVICING
Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and
wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified
values in order to verify compliance with safety standards.
•Insulation resistance test
confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed
parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone
jacks, earphone jacks, etc.) See table below.
•Dielectric strength test
Confirm specified dielectric strength or greater between power cord prongs and exposed accessible parts of
the set (RF terminals, antenna terminals, video and
audio input and output terminals, microphone jacks,
earphone jacks, etc.) See table below.
•Clearance distance
When replacing primary circuit components, confirm
specified clearance distance (d), (d') between sol-
dered terminals, and between terminals and sur-
rounding metallic parts. See table below.
Table 1 : Ratings for selected areas
* Class II model only.
Note. This table is unofficial and for reference only. Be sure to confirm the precise values for your particular
country and locality.
•Leakage Current test
Confirm specified or lower leakage current between B(earth ground, power cord plug prongs) and externally
exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, micro-
phone jacks, earphone jacks, etc.)
Measuring Method: (Power ON)
Insert load Z between B(earth ground, power cord
plug prongs) and exposed accessible parts. Use an
AC voltmeter to measure across both terminals of
load Z. See figure and following table.
Table 2:Leakage current ratings for selected areas.
Note. This table is for IEC member only. Be sure to confirm the precise values for your particular country and
Note. locality.
Chassis
d
a
Primary circuit terminals
Exposed
accessible
part Z
Load AC Voltmeter
Earth Ground,
Power cord plug prongs
B
Fig. 2
AC Line Voltage
AC Line Voltage
100 to 130 V
200 to 240 V
*100 to 130 V
*200 to 240 V
Europe
Australia
Europe
Australia
Other terminals
Antenna earth
terminals
i E0.7m A peak
i E2m A DC
i E0.7m A peak
i E2m A DC
F10 MΩ/500 V DC 4kV 1 minute
F6mm(d)
F8mm(d)
(a Power cord)
Region Load Z Leakage Current(i) Earth Ground
(B) to :
Region Insulation
Resistance
Dielectric
Strength Clearance
Distance(d),(d)
2kΩ
50kΩ

1-5
SPECIFICATIONS
DVD PART
Power supply AC 110~240 V, 50/60 Hz
Power consumtion 23W
Mass 3.0kg(6.6lbs)
External dimensions 430 x 88 x 247 (W x H x D)
Signal system PAL 625/50, NTSC 525/60
Laser Semiconductor laser, wavelength 650nm
Frequency range (digital audio) 4 Hz to 20 kHz
Signal-to-noise ratio (digital audio) More than 100 dB (EIAJ)
Audio dynamic range (digital audio) More than 95 dB (EIAJ)
Harmonic distortion(digital audio) 0.008%
Wow and flutter Below measurable level (less than +0.001%(W.PEAK)) (EIAJ)
Operations Temperature : 5˚C(41˚F) to 35˚C(95˚F),
Operation status : Horizontal
OUTPUTS
Video outputs 1.0V(p-p), 75Ω, negative sync., RCA jack x 1
S video outputs (Y)1.0V(p-p), 75Ω, negative sync.,Mini DIN 4-pin x 1
(C)0.3V(p-p), 75Ω
Component video output (Y) 1.0 V (p-p), 75 Ω, negative sync., RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 Ω
Audio output(digital audio) 0.5V(p-p), 75Ω, RCA jack X 1
Audio output(optical audio) Optical connector x 1
Audio output(analog audio) 2.0Vrms (1kHz, 0dB), 330Ω, RCA jack (L, R) x 1
VHS PART
Video Head System Double azimuth 4 heads, helical scanning
RF Modulator UHF 28-68 (Adjustable)
Tape format Tape width 12.7 mm (0.5 inch)
Timer 24 hours display type
*Designs and specifications are subject to change without notice.
*Weight and dimensions shown are approximate.

1-6
LOCATION OF CUSTOMER CONTROLS
FRONT
OPEN/CLOSE
button
POWER button
PAUSE/STEP
button
SKIP/SCAN
Rewind/FF buttons
STOP
button
Disc tray
PLAY button
Display window
Remote sensor
Video IN
jack Audio IN
(L/R)
jack
DVD to VHS
Copy button
DVD or VHS
mode button
DVD or VHS
mode indicator
Cassette
Compartment
Channel
Programme
Selectors
RECORD
button
EJECT
button
TITLE VCR PROG. CD REC
VCD
AB
DVD
ST
ALL MP3
-R W
BIL PR
SAP CH
AM
SP
LP
EP
CHP/TRK TIMER
REC HI-FI
DVD indicator
CD REC indicator
PROGRAM indicator
Repeat playback
mode indicators
Chapter/Track number indicator
Video CD indicator
Angle icon indicator
Total playing time/elapsed time indicators
Title number indicator
Stereo indicator
REAR
AUDIO OUT (L/R) jacks
POWER CORD
COAXIAL DIGITAL AUDIO OUT jack
COMPONENT VIDEO OUT jacks
AUDIO IN (L/R)/VIDEO IN
jacks
AERIAL
AUDIO
OUT
AUDIO
VHS
IN
DVD/VHS
OUT
DVD/VHS
TO TV
AERIAL
VIDEO
VIDEO OUT
R
L
R
Y
Pb
Pr
COAXIAL
DIGITAL
AUDIO OUT
COMPONENT
VIDEO OUT
VIDEO OUT jackRF.OUT
INDICATOR PANEL

1-7
POWER button
TV/VCR button
DVD MODE button
CLK/CNT/DISPLAY
button
SELECT/ENTER button
SETUP button
***TITLE button
PAUSE/STE button
BACKWORD button
SUBTITLE button
SUBTITLE button
ANGLE button
C.LOCK button
REPEAT/ez REPEAT
button
OPEN/CLOSE button
VHS MODE button
OUTPUT SELECT button
*DISC MENU button
** ARROW buttons
AV button
STOP button
REC/ITR button
FORWARD button
PROGRAM button
CLEAR button
NUMBER buttons
MARKER-SEARCH buttons
RETURN button
ZOOM button
RANDOM/CM SKIP button
A-B/SPEED button
SHOWVIEW button
REMOTE CONTROL
***TITLE BUTTON
USE THE TITLE BUTTON TO DISPLAY
THE TITLE SCREEN INCLUDED ON DVD
VIDEO DISCS. TO OPERATE A MENU
SCREEN, FOLLOW THE INSTRUCTIONS
IN “USING A TITLE MENU”(PAGE 46).
*DISC MENU BUTTON
USE THE DISC MENU BUTTON TO DISPLAY
THE MENU SCREEN INCLUDED ON DVD
VIDEO DISCS. TO OPERATE A MENU
SCREEN, FOLLOW THE INSTRUCTIONS IN
“USING A DVD MENU”(PAGE 46).
** DIRECTIONAL ARROW BUTTONS
(UP, DOWN, LEFT, RIGHT) FOR USE IN HIGH-
LIGHTING A SELECTION ON A GUI MENU
SCREEN, TITLE AND MENU SCREEN.

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
1. EXPLODED VIEWS ................................................................................................................2-2
1. Cabinet and Main Frame Section ...........................................................................................2-2
2. Packing Accessory Section....................................................................................................2-4

2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
330
452
452
A43
A00
A42
A26
A46
A46-1
A49
280
276
260
285
465
467
300
457
463 463
457
320
250
462
462
462
284
283
DG601
457
A
5
4
3
2
1
BCD

2-3
•Cabinet and Main Frame Section
S AL LOCA.NO PART NO(LG) DESCRIPTION SPECIFICATION REMARKS
ASSEMBLY SECTION
A42 3501R-4942A BOARD ASSEMBLY LV-DV82
A43 3721R-F249F PANEL ASSEMBLY,FRONT FRONT (DC593NW)
A46 3501R-4938H BOARD ASSEMBLY DC593NW
A46-1 6871R-2199A PWB(PCB) ASSEMBLY,TOTAL 2002 DVD+VCR KOR
A49 3501R-4941A BOARD ASSEMBLY LV-DV72 TIMER ASSY
PARTS SETION
250 3110R-P009A CASE TOP(DVD+VCR)
260 3210R-0067A FRAME MAIN(DVD+VCR) NSP
276 4930R-0298A HOLDER,SHELF TIMER PWB(D+V)
280 3720R-F189B PANEL,VIDEO FRONT(DC593W 402AF 8167 A2271G NSP
283 3580R-V028B DOOR,CASE CST (HF380 11255 A2271G HOT 1M
284 442-681A SPRING DOOR
285 3580R-T049A DOOR,CASE TRAY (DVD+VCR)
300 6410RKHJ02A POWER CORD JL-004S H03VVH2-F 2X0.75MM COR
320 3720R-D050B PANEL,VIDEO BACK(DC593W RCA TU W/O S 51)
330 3140R-0042A CHASSIS MAIN(DVD+VCR)
SCREW
452 353-051A SCREW SPECIAL
457 353-051E SCREW SPECIAL (3X12)
462 353-085E SCREW,DRAWING + 3 D4.0 L10.0 MSWR3/FZMCW-2
463 353-051B SCREW SPECIAL
465 353-046K SCREW SPECIAL (3X10 B.K)
467 353-051G SCREW,DRAWING + 2 D3.0 L8.0 MSWR3/FN TB ROUN

2.Packing Accessory Section
BATTERY
808
PACKING SHEET
804
PACKING
OPTIONAL PARTS
803
806
813
OWNER'S MANUAL
RF CABLE
810 CABLE SET ASS'Y
801
REMOCON
900
BOX CARTONX
802
PACKING
803
811
812
PHONO CORD 1WAY
PHONO CORD 2WAY
2-4
•Packing Accessory Section Part List
S AL LOCA.NO PART NO(LG) DESCRIPTION SPECIFICATION REMARKS
801 3835RP0074J INSTRUCTION ASSEMBLY DC593NW
802 3890R-H769H BOX DC593NW AA4HJL
803 3920R-E045A PACKING,CASING DC-N72 0.02 80 EPS 4 714 1428
804 3858R-S001A SHEET (MECH) LDPE 600M 630MM 0.5 VCR_DVD NSP
806 6850R-CAA26 CABLE,COAXIAL 1200M/M PAL-PAL DOUBLE SHIELD
808 534-008C BATTERY,MANGANESE AAAM(R03) SEOTONG 1-5 V - 1PA
811 6611R1G001A PLUG ASSY 1WAY YELLOW GLOBAL
812 6611R2G001A PLUG ASSY 2WAY RED/WHITE GLOBAL
900 6711R1P042A REMOTE CONTROLLER ASSEMBLY N6 NOR DC953W LG

3-1
SECTION 3
ELECTRICAL
CONTENTS
OVERALL BLOCK DIAGRAM.................................................................................................................3-2
VCR PART
ELECTRICAL TROUBLESHOOTING GUIDE ....................................................................................3-3
1. POWER(SMPS) Circuit ............................................................................................................................3-3
2. SYSTEM/KEY CIRCUIT............................................................................................................................3-6
3. SERVO CIRCUIT ......................................................................................................................................3-7
4. OSD CIRCUIT ...........................................................................................................................................3-9
5. Y/C CIRCUIT ...........................................................................................................................................3-10
6. Hi-Fi CIRCUIT .........................................................................................................................................3-14
7. Tuner/IF CIRCUIT ...................................................................................................................................3-17
BLOCK DIAGRAMS..................................................................................................................................3-19
1. Power (SMPS) Block Diagram..............................................................................................................3-19
2. TU/IF, NICAM & A2 Block Diagram ......................................................................................................3-21
3. Y/C Block Diagram ................................................................................................................................3-23
4. NORMAL AUDIO Block Diagram ..........................................................................................................3-25
5. Hi-Fi Block Diagram(Hi-Fi PART) .........................................................................................................3-27
6. SYSTEM Block Diagram .......................................................................................................................3-29
CIRCUIT DIAGRAMS ...............................................................................................................................3-31
1. Power (SMPS) Circuit Diagram ............................................................................................................3-31
2. TU/IF, NICAM & A2 Circuit Diagram.....................................................................................................3-33
3. A/V Circuit Diagram...............................................................................................................................3-35
4. Hi-Fi Circuit Diagram.............................................................................................................................3-37
5. SYSTEM Circuit Diagram......................................................................................................................3-39
•WAVEFORMS ...........................................................................................................................................3-41
•CIRCUIT VOLTAGE CHART ....................................................................................................................3-43
PRINTED CIRCUIT DIAGRAMS ...........................................................................................................3-45
1. MAIN P.C.BOARD...................................................................................................................................3-45
2. KEY P.C.BOARD ....................................................................................................................................3-47
3. CLOCK P.C.BOARD ...............................................................................................................................3-47
DVD PART
ELECTRICAL TROUBLESHOOTING GUIDE ..................................................................................3-49
1. µ-COM CIRCUIT .....................................................................................................................................3-49
2. MPEG CIRCUIT ......................................................................................................................................3-51
3. RF/Servo CIRCUIT .................................................................................................................................3-52
BLOCK DIAGRAMS..................................................................................................................................3-56
1. DVD Overall Block Diagram .................................................................................................................3-56
2. RF/CD DSP/DVD DSP/DVD SERVO Block Diagram ...........................................................................3-57
3. Audio Block Diagram ............................................................................................................................3-58
4. MPEG Block Diagram............................................................................................................................3-59
5. µ-COM Block Diagram...........................................................................................................................3-60
CIRCUIT DIAGRAMS ...............................................................................................................................3-61
1. DVD DSP Circuit Diagram.....................................................................................................................3-61
2. DRIVE & RF Circuit Diagram ................................................................................................................3-63
3. MPEG Circuit Diagram ..........................................................................................................................3-65
4. Audio DM & 5.1CH Circuit Diagram .....................................................................................................3-67
5. µ-COM/Expander Circuit Diagram........................................................................................................3-69
6. Jack Circuit DIAGRAM..........................................................................................................................3-71
•WAVEFORMS ...........................................................................................................................................3-73
•CIRCUIT VOLTAGE CHART ....................................................................................................................3-75
PRINTED CIRCUIT DIAGRAMS ...........................................................................................................3-79
1. MAIN P.C.BOARD (TOP VIEW)..............................................................................................................3-79
1. MAIN P.C.BOARD (BOTTOM VIEW) .....................................................................................................3-81

OVERALL WIRING DIAGRAM
3-2
PMC01
CFG
12VA(CAP)
5.2VA
CAP REV'H'
I-limit
MOTOR GND
GND
12VA(DRUM)
CAP CTL
LD IN
DFG/FG
DRUM CTL
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
PMD02
Vcc(HF)
RF
DVD_LD
DVD_PD
VOL(DVD)
GND
VC_INPUT
Vcc(HF)
F
E A
D C
B
F(+)
T(-)
T(+)
F(-)
Vcc
GND
CD_LD
CD_PD
VOL(CD)
1 2 3 4 5 6 7 8 9
10
11
12 13 14 15 16 17 18 19 20 21 22 23
1 2 3 4 5 6 7 8 9
10
11
12 13 14 15 16 17 18 19 20 21 22 23
PM601
GND
FLD CLK
FLD ENA
FLD DATA
REMOCON
KEY RETURN KEY RETURN
5.3VA
FD(-)
FD(+)
-27VA
GND
1 2 3 4 5 6 7 8 9
10
11
12
1 2 3 4 5 6 7 8 9
10
11
12
PM401
A.LN 'R'
A.LN'L'
GND
V.IN
GND
1 2 3 4 5
1 2 3 4 5
PMD03
CLOSE_SW
FM+
OPEN_SW
LM+
LM-
FM-
GND
A1 A3 A2
VH+
H3+
LIMIT_SW
GND
H3-
H2+
H2-
H1+
H1-
VH-
1 2 3 4 5 6 7 8 9
10
11
12 13 14 15 16 17 18 19 20
1 2 3 4 5 6 7 8 9
10
11
12 13 14 15 16 17 18 19 20
P3D02
CTL(+)
CTL(-)
A/E(+)
A/E(-)
A.REC
A.PB
1
2
3
4
5
6
1
2
3
4
5
6
GND
FULL ERASE
P3D03
1
2
1
2
DVD V.IN
GND
DVD A.IN'L'
GND
DVD A.IN'R'
GND
DVD RESET
DVD ENA
DVD CLK
DVD DATA IN
DVD DATA OUT
GND
PVD02P8D01
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
5.3VA
8VA
GND(M)
REG12V
3.3V
3.3V
5V
5V
GND
2.5V
GND
GND
PVD01P1D01
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
GND
GND
5.3VA
KEY RETURN
DVD FLD
VCR LED
GND
GND
PM602PM603
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
DECK MD
MPEG
BOARD
TIMER
BOARD
KEY BOARD
VCR

3-3
ELECTRICAL TROUBLESHOOTING GUIDE
VCR PART
1. Power(SMPS) CIRCUIT
NO 5.3VA.
Replace the F101.
(Use the same Fuse)
Is the F101 normal?
Is the R101
normal?
Is the BD101
normal?
NO
NO
NO
NO
NO
NO
NO
Replace the
BD101.
Replace the R101.
Is the D102
normal?
Check or Replace
the D102.
Replace the D112.
Replace the IC102.
Replace the D110.
YES
YES
YES
YES
YES
YES
YES
YES
Is Vcc(8.5~21V) sup-
plied to IC101 Pin7?
NO
Is the D112 normal?
Is there about 2.5V
at the IC102 Vref?
Is the D110 normal?
Check the Main PCB
5.3VA/5.0V Line short?
(1) No 5.3VA (SYS/Hi-Fi/TUNER)
NO 12VA.
Check or Replace
the D110.
Is the Vcc(13V) supplied to (+)
terminal in D115 and D117?
Check or Replace
the Motor Vcc.
Is the Vcc(12V) supplied to (-)
terminal in D115 and D117?
NO
NO Replace the D115,
D117.
YES
YES
YES
(2) No 12VA (TO CAP, DRUM MOTOR)
NO 5.2VA.
5.3VA Line Check.
Is 5.3VA put into
the Q116 Emitter?
Is about 5V put into
the Q116 Base?
Is the Q115 Base
“H”?
NO
NO Check the Power
Control.
NO
Check or Replace the Q115,
R160, R161, R162, D122.
YES
YES
YES
Check or Replace
the Q115/Q116
YES
(3) No 5.2V (SYS/Hi-Fi/TUNER)

3-4
NO 5V.
5.3VA Line Check.
Is 5.3VA put into
the Q113 Emitter?
Is about 5V put into
the Q113 Base?
Is the Q115 Base
“H”?
NO
NO
NO
Check the Power
Control.
Check or Replace the Q115,
R157, R158, R159, D121.
YES
YES
YES
YES
Check or Replace
the Q113/Q115
(4) No 5V (TO DVD)
No REG 5V.
5.3VA Line Check.
Is 5.3VA put into the
Q117 Collector?
Check or Replace the Q117,
R167, ZD105, C162.
Is 33V put into the
Q117 Base?
NO
NO Check 33V Line.
YES
YES
YES
(5) No REG 5V (AVCP)
No 33V.
Check the Power
Control.
Is Q115 Base “H”?
Check or Replace
Q114, R154, R155.
NO
YES
YES
(6) No 33V (TUNER)
No REG 12V.
Check or Replace
D110.
Is 13V put into the
Q112 Collector?
Is 33V put into the
Q112 Base?
NO
Check 33V Line.
NO
YES
YES
Check or Replace the Q112,
ZD103, R153, C151.
YES
(7) No REG 12V

3-5
NO -29VA.
Check or Replace
D108.
YES
(8) No -29VA
NO 8VA.
Check or Replace
the D110.
Is Vcc(13V) supplied to
(+) terminal in D114?
Is the Q115 Base
“H”?
Is Vcc(12V) supplied
to IC106 Pin1?
NO
NO Check or Replace
the D114.
NO Check the Power
Control.
YES
YES
YES
Check or Replace
IC106, R170, C154.
YES
(9) No 8VA
NO 3.3VA.
Is Vcc(4V) supplied
to IC103 Pin1?
YES
Is the Q115 Base
“H”?
YES
Check or Replace
IC103, R156, C153.
YES
(10) No 3.3V
Check or Replace
the D111.
NO
NO Check the Power
Control.
NO 2.5VA.
Is Vcc(4V) supplied
to IC104 Pin1?
YES
Is the Q115 Base
“H”?
YES
Is Vcc(3.3V) supplied
to IC104 Pin2?
YES
Check or Replace
D119, C159.
YES
(11) No 2.5V
Check or Replace
the D111.
NO
NO Check the Power
Control.
NO Check or Replace
the IC104.

3-6
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
(2) The unstable loading of a Cassette tape
Auto Stop
Does the SW30 waveform
appear at the IC501
Pin24?
Do the T-UP Reel Pulses
appear at the IC501 Pin4?
Is 12V applied to the
PMC01 Pin8?
Check the Drum Motor
signal.
Does 5.2V appear at the
RS501?
Check the Q116 Power
Circuit.
Refer to “SMPS DRUM
12 Volt Trouble Shooting”.
Is 5.3V applied to the
R544 ?
Refer to SMPS 5.3VA
troubleshooting.
Check the IC501
Pins74, 75, 76, 77.
Do T/UP Reel Pulses
appear at the Q514
Base terminal ?
Replace the T/UP Reel
Sensor (RS501).
Check the CST SW and
the peripheral circuitry.
Replace the IC501.
The unstable loading of a
Cassette tape
Does the “H”signal appear
at the IC501 Pin57 during
inserting the CST ?
Does the “L”signal appear
at the IC501 Pin19 during
inserting the CST?
Check the Deck
Mechanism.
Caution : Auto stop can occur because Grease or Oil is dried up
YES
YES
YES NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO NO
YES
YES YES

3-7
3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
Does the Noise level of the
screen change
periodically?
Do the CTL pulses appear
at the IC501 Pin37?
Is adjusting the height of
the CTL Head accurate?
Readjust the height of the
CTL Head.
Replace the IC501.
Refer to “When the Y signal
doesn’t appear on the
screen in PB Mode”.
Does the CFG waveform
appear at the IC501
Pin40?
On tracking do the CTL
pulses move?
Does the Video Envelope
waveform appear at the
IC501 Pin12?
Replace the IC501.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
(2) When the Drum Motor
(2) doesn’t run. Do the DFG Pulses appear
at the PMC01 Pin11?
Replace the Cap M.
Aren’t the foil patterns and
the Components between
IC501 Pin 38 and PMC01
Pin11 short?
Replace the IC501.
Refer to “(2)
No 12VA of Power section”
Do the Drum PWM Pulses
appear at the IC501
Pin26?
Aren’t the foil patterns and
the Components between
IC501 Pin26 and PMC01
Pin12 short?
Do the DFG Pulses appear
at the IC501 Pin38?
Do the Drum PWM Pulses
appear at the IC501
Pin26?
Aren’t the connecting patterns and the Components
between IC501 Pin26 and PMC01 Pin11 short?
When the Drum Motor
doesn’t run,
Does 12V appear at the
PMC01 Pin8?
Does 2.8V appear at the
PMC01 Pin12?
Check the connector
(PMC01) and the Drum
Motor Ass’y.
NO
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES

3-8
Does the CFG signal appear at the
PMC01 Pin1?
Does the PWM signal appear at the
IC501 Pin25?
Does 2.8V appear at the PMC01?
Check the PMC01 and the Capstan
Motor Ass’y.
Does the Capstan PWM signal appear at
the IC501 Pin25?
Aren’t the foil patterns and Components
between IC501 Pin25 and PMC01
Pin9 short?
Does the CFG signal come into the
IC501 Pin40?
Aren’t the foil patterns and Components
between IC501 Pin 25 and PMC01
Pin9 short?
2. SERVO CIRCUIT
(3) When the Capstan Motor doesn’t run,
NO
NO
NO
YES
YES
YES
When the Capstan Motor doesn’t run,
Does 12VA appear at the PMC01?
YES
Replace the IC501.
YES
NO
NO
YES
Refer to “SMPS(CAPSTAN/12Volt)
Trouble Shooting”.
Aren’t the foil patterns and component
between IC501 Pin40 and PMC01
Pin1 short?
Check the Capstan Motor Ass’y.
NO