Video Head systemDouble azimuth 6 heads, helical scanning.
Signal systemPAL
Frequency responseDVD (PCM 96 kHz): 8 Hz to 44 kHz, DVD (PCM 48 kHz): 8 Hz to 22 kHz, CD: 8 Hz to 20 kHz
Signal-to-noise ratioMore than 100 dB (ANALOG OUT connectors only)
Harmonic distortionLess than 0.008%
Dynamic rangeMore than 100 dB (DVD), More than 95 dB (CD)
Inputs (VCR)
Audio-6.0 dBm, more than 10 kΩ (SCART), -6.0 dBm, more than 47 kΩ (RCA)
Video1.0 V (p-p), 75 Ω, unbalanced (SCART/RCA)
Outputs (DVD)
VIDEO OUT1 Vp-p 75 Ω, sync negative
Audio output (digital audio)0.5 V (p-p), 75 Ω, RCA jack × 1
Audio output (analog audio)2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R) x 1/SCART (TO TV)
Outputs (VCR/DVD)
Audio-6.0 dBm, less than 1 kΩ (SCART)
Video1.0 V (p-p), 75 Ω, unbalanced (SCART)
• Designs and specifications are subject to change without notice.
• Manufactured under license from Dolby Laboratories. "Dolby", "Pro Logic" and the double-D symbol are trademarks of Dolby Laboratories.
• DTS and DTS Digital Out are trademarks of Digital Theater Systems, Inc.
• SHOWVIEW is a trademark of Gemstar Development Corporation. The SHOWVIEW system is manufactured under license from
Gemstar Development Corporation.(EF/ER/EU/EY/EZ models)
• VIDEO Plus+ and PlusCode are registered trademarks of Gemstar Development Corporation. The VIDEO Plus+ system is manufactured under license from Gemstar Development Corporation.(EK model)
1-2 (No.YD068)
Page 3
SECTION 1
r
PRECAUTION
1.1SAFTY PRECAUTIONS
Prior to shipment from the factory, JVC 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 compliance, it is equally
important to implement the following precautions when a set is
being serviced.
1.1.1 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 ( ) 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) Fuse replacement caution notice.
Caution for continued protection against fire hazard.
Replace only with same type and rated fuse(s) as specified.
(4) Use specified internal wiring. Note especially:
• Wires covered with PVC tubing
• Double insulated wires
• High voltage leads
(5) Use specified insulating materials for hazardous live parts.
Note especially:
• Insulation Tape
• PVC tubing
•Spacers
• Insulation sheets for transistors
•Barrier
(6) When replacing AC primary side components (transformers,
power cords, noise blocking capacitors, etc.) wrap ends of
wires securely about the terminals before soldering.
Consequently, when servicing these products, replace the
cathode ray tubes and other parts with only the specified
parts. Under no circumstances attempt to modify these circuits.Unauthorized modification can increase the high voltage value and cause X-ray emission from the cathode ray
tube.
(12) Crimp type wire connectorIn such cases as when replacing
the power transformer in sets where the connections between the power cord and power trans former primary lead
wires are performed using crimp type connectors, if replacing the connectors is unavoidable, in order to prevent safety hazards, perform carefully and precisely according to the
following steps.
• Connector part number :E03830-001
• Required tool : Connector crimping tool of the proper
type which will not damage insulated parts.
• Replacement procedure
a) Remove the old connector by cutting the wires at a
point close to the connector.Important : Do not reuse a connector (discard it).
cut close to connector
Fig.1-1-3
b) Strip about 15 mm of the insulation from the ends
of the wires. If the wires are stranded, twist the
strands to avoid frayed conductors.
15 mm
Fig.1-1-4
c) Align the lengths of the wires to be connected. In-
sert the wires fully into the connector.
Metal sleeve
Fig.1-1-1
(7) Observe that wires do not contact heat producing parts
(heatsinks, oxide metal film resistors, fusible resistors, etc.)
(8) Check that replaced wires do not contact sharp edged or
pointed parts.
(9) When a power cord has been replaced, check that 10-15
kg of force in any direction will not loosen it.
Power cord
Fig.1-1-2
(10) Also check areas surrounding repaired locations.
(11) Products using cathode ray tubes (CRTs)In regard to such
products, the cathode ray tubes themselves, the high voltage circuits, and related circuits are specified for compliance with recognized codes pertaining to X-ray emission.
Connector
Fig.1-1-5
d) As shown in Fig.1-1-6, use the crimping tool to
crimp the metal sleeve at the center position. Be
sure to crimp fully to the complete closure of the
tool.
1.2
5
2
.0
5.5
Crimping tool
Fig.1-1-6
e) Check the four points noted in Fig.1-1-7.
Not easily pulled free
Wire insulation recessed
more than 4 mm
Crimped at approx. cente
of metal sleeve
Conductors extended
Fig.1-1-7
(No.YD068)1-3
Page 4
1.1.2 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.
(1) 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 1 below.
(2) Dielectric strength test
Confirm specified dielectric strength or greater between
power cord plug 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 Fig.1-1-11 below.
(3) Clearance distance
When replacing primary circuit components, confirm specified clearance distance (d), (d') between soldered terminals, and between terminals and surrounding metallic
parts. See Fig.1-1-11 below.
d
Chassis
d'
Power cord
primary wire
Fig.1-1-8
(4) Leakage current test
Confirm specified or lower leakage current between earth
ground/power cord plug prongs and externally exposed accessible parts (RF terminals, antenna terminals, video and
audio input and output terminals, microphone jacks, earphone jacks, etc.).
Measuring Method : (Power ON)Insert load Z between
earth ground/power cord plug prongs and externally exposed accessible parts. Use an AC voltmeter to measure
across both terminals of load Z. See Fig.1-1-9 and following Fig.1-1-12.
ab
Externally
exposed
accessible part
Z
V
c
A
Fig.1-1-9
(5) Grounding (Class 1 model only)
Confirm specified or lower grounding impedance between
earth pin in AC inlet and externally exposed accessible
parts (Video in, Video out, Audio in, Audio out or Fixing
screw etc.).Measuring Method:
Connect milli ohm meter between earth pin in AC inlet and
exposed accessible parts. See Fig.1-1-10 and grounding
specifications.
AC inlet
Earth pin
Exposed accessible part
MIlli ohm meter
Grounding Specifications
Region
USA & Canada
Europe & Australia
Grounding Impedance (Z
Z0.1 ohm
Z0.5 ohm
)
Fig.1-1-10
AC Line Voltage
100 V
100 to 240 V
110 to 130 V
110 to 130 V
200 to 240 V
Region
Japan
USA & Canada
Europe & Australia
Insulation Resistance (R
R 1 M /500 V DC
1 M R 12 M /500 V DC
R 10 M /500 V DC
)
Dielectric Strength
AC 1 kV 1 minute
AC 1.5 kV 1 minute
AC 1 kV 1 minute
AC 3 kV 1 minute
AC 1.5 kV 1 minute
(
Class
(
Class
Clearance Distance (d), (d'
d, d' 3 mm
d, d' 4 mm
d, d' 3.2 mm
d 4 m m
)
d' 8 m m (Power cord
d' 6 m m (Primary wire
)
Fig.1-1-11
AC Line Voltage
100 V
110 to 130 V
110 to 130 V
220 to 240 V
Region
Japan
USA & Canada
Europe & Australia
Load Z
1
0.15
1.5
2
50
Leakage Current (i)
i 1 mA rms
i 0.5 mA rms
i 0.7 mA peak
i 2 mA dc
i 0.7 mA peak
i 2 mA dc
a, b, c
Exposed accessible parts
Exposed accessible parts
Antenna earth terminals
Other terminals
Fig.1-1-12
NOTE :
These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.
)
)
)
1-4 (No.YD068)
Page 5
1.2Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
1.2.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
(No.YD068)1-5
Page 6
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1DIFFERENT TABLE OF FEATURE
The following table indicates main different points between models HR-XV28SEF, HR-XV28SEK, HR-XV28SER, HR-XV28SEU and
HR-XV28SEY/EZ.
- Eeprom EDIT screen automatically appears if
replacing Eeprom.
- Setup option data using the cursor Up/Down key
of a remote control.
(Setup upon BOM depending on OPT0~OPT5
model)
Since an initial remote control is set to LG for LG
model, appropriately set optiona data using the
cursor Up/Down key.
2. EEPROM WRITED AND EEPROM INITIAL
- Writes data on EEPROM by using REMOCON
"OK" + FRONT PLAY KEY FOR MORE THAN 5
SECONDS.
3. PG ADJUST
1) Payback the SP standard tape
2) Press the "OK" key on the Remote controller
and the "PLAY" key on the Front Panel the
same time, then it goes in to Tracking initial
mode.
3) Repeat the above step(No.2), then it finishes
the PG adjusting automatically.
4) Stop the playback, then it goes out to PG
adjusting mode after mony the PG data.
4. BUYER SELECTION
- Font ejection key + open/close key for more than
5 seconds.
- Option code is displayed in TV
- First byte of OPTO is changed whenever front
eject key + open/close key.
- JVC remote conroller No.0.
(No.YD068)1-7
Page 8
2.3SERVICE INFORMATION FOR EEPROM (DVD)
POWER ON
DVD LOGO Status (NO Disk status)
DETECT NEW EEPROM
(OPTION EDIT SCREEN)
Remote control
Pause key 1 4 7 2 in order.
Press number 0~9, Press charater
A~F (1~6 for a while)
Use arrow key ( ) to move
to approprite position and make
changes
NTSC model does not have VCR option and use DVD option B~F as VCR option. (only DVD exist)
PAL model has another separate VCR option. (Both VCR and DVD exist)
1-8 (No.YD068)
Page 9
SECTION 3
DISASSEMBLY
This service manual does not describe DISASSEMBLY.
(No.YD068)1-9
Page 10
SECTION 4
ADJUSTMENT
4.1POSITION DRAWING OF DECK MECHANISM PARTS (VCR)
Top View
9
2
6
11
1
33
14
15
7
35
4
3
5
10
8
12
18
16
17
19
13
15
Bottom View
20
21
24
21
24
23
22
30
NOTE : Assembly order is a reverse of
disassembly order.
(1) For assembly, check the assembly mode is accurate.
(2) Parts firstly disassembled indicate parts firstly disassembled
in disassembly of related parts.
1-10 (No.YD068)
Page 11
4.2DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM (VCR)
Drum Assembly
Cable Flat
1. Disassembly of Drum Assembly
(Figure A-1)
1) Separate cable flat from the Drum FPC and the Capstan
Motor.
2) Release 3 screws (S1) on the bottom side of the chassis,
and separate the drum assembly.
3) Release the hooks (H1, H2) and separate both the holder
FPC and the Cap FPC (disassemble if necessary).
(S1)
H2
Fig. A-1
Cautions in assembly of FPC
Holder FPC
(S1)
(S1)
Cap, FPC
H1
Holder FPC
Cap FPC
Drum FPC
Assembly shape seen in the reverse direction
(No.YD068)1-11
Page 12
Plate Top
(Fig. A-2-1)
(H4)
(B')
Arm Assembly F/L
(Fig. A-2-5)
Lever Assembly S/W
(Fig. A-2-6)
(B)
(C)
Holder Assembly CST
(Fig. A-2-2)
(E)
(E)
1-12 (No.YD068)
Fig. A-2
Gear Assembly Rack F/L
(Fig. A-2-3)
Opener Door
(Fig. A-2-4)
(A)
(H3)
(B)
Page 13
2. Disassembly of Plate Top (Fig. A-2-1)
1) Separate the right part while leaning back the (B) part of
the plate top toward the arrow direction.
2) Separate the left part while leaning back the (B f) part of
the plate top toward the arrow direction.
(Tool used: Tool such as (-) driver, auger, etc with pointed
or flat end)
CAUTIONS
Assemble while pressing the (C), (C') part after corresponding them as in drawing.
(C')
(C)
(B')
(B)
3. Holder Assembly CST (Fig. A-2-2)
1) Firstly separate the left part from the groove on the (D)
part of chassis while moving the holder assembly CST
toward the arrow direction.
Holder Assembly CST
(D)
Chassis
4. Disassembly of Gear Assembly
Rack F/L (Fig. A-2-3)
1) Separate the hook (H3) while leaning ahead the hook (3)
after moving the gear assembly rack F/L toward the arrow
(A) direction.
2) Separate the gear assembly rack F/L toward the arrow (B)
direction.
CAUTIONS
For the assembly, correspond the gear part of gear assembly
rack F/L to the gear drive.
Gear Rack F/L
Gear Drive
5. Opener Door (Fig. A-2-4)
1) Separate the opener door ahead from the guide hole of
chassis while turning it clockwise.
6. Arm Assembly F/L (Fig. A-2-5)
1) Firstly separate the left part of the arm assembly F/L from
the groove of chassis while pushing the arm assembly F/L
toward the arrow direction.
2) Separate the right part from the groove of chassis.).
2) Separate the right part from each groove of chassis
CAUTIONS
Assemble by inserting the left part after firstly inserting the
(E) part of the holder assembly CST into the groove on the
(E') part of chassis.
7. Lever Assembly S/W (Fig. A-2-6)
1) Separate the lever assembly S/W while pushing it toward
the arrow direction after removing the hook (4) on the left
side of chassis.
Chassis
(H4)
(No.YD068)1-13
Page 14
Base Assembly A/C Head
(Fig. A-3-5)
(A)
Arm Assembly Cleaner
(Fig. A-3-3)
(A)
(S5)
(H5)
Gear Wheel
(Fig. A-3-2)
Motor Assembly L/D
(Fig. A-3-1)
Head F/E
(Fig. A-3-4)
(C1)
(S4)
Fig. A-3
8. Motor Assembly L/D (Fig. A-3-1)
1) Take the connector (C1) connected to the Capstan motor
PCB out.
2) Remove a screw (S4) of the chassis (S4) and step back ward, and disassemble it while holding it up.
9. Gear Wheel (Fig. A-3-2)
1) Release the hook (H5) of the gear wheel and disassemble
it upward.
1-14 (No.YD068)
10. Arm Assembly Cleaner (Fig. A-3-3)
1) Separate the (A) part of Fig. A-3-1 from the embossing of
chassis, and hold it up while turning it anti-clockwise.
11. Head F/E (Fig. A-3-4)
1) Separate the (A) part of the head F/E from the embossing of chassis, and hold it up while turning it anti-clockwise.
12. Base Assembly A/C Head (Fig. A-3-5)
1) Release a screw (S5) and disassemble while holding it up.
Page 15
Arm Assembly Tension
(Fig. A-4-2)
Spring Tension
(H7)
Reel T
(Fig. A-4-3)
Reel S
(Fig. A-4-3)
(H8)
Spring Tension
Fig. A-4
Brake Assembly T
(Fig. A-4-1)
(H6)
13. Brake Assembly T (Fig. A-4-1)
1) Release the spring tension from the lever spring hook
(H6).
2) Disassemble the brake assembly T while holding it
upward.
14. Arm Assembly Tension (Fig. A-4-2)
1) Release the spring tension the hook (H7) from the arm
assembly tension.
2) After releasing the hook (H8) of the base tension, separate
it while holding it up.
CAUTIONS
Spring used for both brake assembly T and arm assembly
tension is used (2EA used).
15. Reel S/Reel T (Fig. A-4-3)
1) Disassemble the reel S/ reel T while holding it up (compa rison between Reel S and Reel T)
Reel SReel T
(No.YD068)1-15
Page 16
(Fig. A-5-2)
(B)
Opener Lid
Arm Assembly Pinch
(Fig. A-5-3)
(C)
Base Assembly P4
(Fig. A-5-1)
(A)
(C)
(H9)
Arm T/up
(Fig. A-5-4)
Chassis
16. Base Assembly P4 (Fig. A-5-1)
1) Release the (A) part of the base assembly P4 from the
embossing of chassis.
2) Hold the base assembly P4 up while turning it anti-clock wise.
17. Opener Lid (Fig. A-5-2)
1) Release the (B) part of the opener lid from the embossing
of chassis.
2) Disassemble the opener lid upward while turning it anticlo ckwise.
1-16 (No.YD068)
Fig. A-5
18. Arm Assembly Pinch (Fig. A-5-3)
1) Hold the arm assembly pinch up.
19. Arm T/up (Fig. A-5-4)
1) Turn the arm T/up to release the anchor jaw (H9) part of
chassis and then hold it upward.
CAUTIONS
For the assembly, check the (C) part of the arm assembly
pinch is assembled as in drawing.
- REVERSE THE MECHANISM.
Page 17
Suppoter Capstan
(Fig. A-6-1)
Motor Capstan
(L1)
Lever F/R
(Fig. A-6-4)
Belt Capstan
(Fig. A-6-2)
(Fig. A-6-3)
Washer(W1)
Clutch Assembly D37
(Fig. A-6-5)
(L1)
(S6)
Fig. A-6
20. Supporter, Capstan (Fig. A-6-1)
1) Turn the supporter and Capstan by 90 deg. clockwise
with a driver for disassembly.
21. Belt Capstan (Fig. A-6-2) /
Motor Capstan (Fig. A-6-3)
1) Separate the belt Capstan.
2) Undo 3 screws (S6) on the bottom side of chassis and dis assemble it upward.
Chassis
22. Lever F/R (Fig. A-6-4)
1) Release the locking tab (L1) and then disassemble it
upward.
23. Clutch Assembly D37 (Fig. A-6-5)
1) Remove the washer (W1) and then disassemble it
upward.
(No.YD068)1-17
Page 18
(H10)
(Fig. A-7-2)
(W2)
Gear Cam
Washer (W2)
(H11)
Gear Sector
(Fig. A-7-3)
Gear Cam Hole(B)
Gear Cam Hole(C)
Gear Drive Hole(A)
Gear Drive
(Fig. A-7-1)
Lever Brack
(Fig. A-7-8)
(L2)
Chassis
Brake Assembly Capstan
(Fig. A-7-4)
(Fig. A-7-5)
(Fig. A-7-6)
(B)
(Fig. A-7-7)
3 6
Plate Slider
Lever Tension
Lever spring
Base Loading
Fig. A-7
24. Gear Drive (Fig. A-7-1)/Gear Cam (Fig. A-7-2)
1) Remove the washer (W2) and then disassemble the
gear drive.
2) Release the hook (H10) of the gear cam and then disas semble it upward.
CAUTIONS
For the assembly, adjust both the gear driver hole (A) and
the gear cam hole (B) straightly and then correspond the
gear cam hole (C) to the chassis hole.
25. Gear Sector (Fig. A-7-3)
1) Release the hook (H11) of the gear sector and then hold
the gear sector upward.
26. Brake Assembly Capstan (Fig. A-7-4)
1) Release the locking tab (L2) on the bottom side of the
plate slider and then disassemble it upward.
27. Plate Slider (Fig. A-7-5)
1) Disassemble the plate slider while holding it up.
28. Lever Tension (Fig. A-7-6)
1) Release the lever tension from the guide (A) of chassis
while turning it anti-clockwise.
2) Disassemble the lever tension while holding it up.
29. Lever Spring (Fig. A-7-7)
1) Release the (B) part of the lever spring from the guide
(A) of chassis while turning it anti-clockwise.
2) Disassemble the lever tension while holding it up.
30. Lever Brake (Fig. A-7-8)
1) Disassemble the lever brake while holding it up.
For the assembly, check the holes of both the gear assembly P2 and the P3 are adjusted straightly, and then correspond the gear section groove (A) to the plate slider hole (B).
(B)
(A)
Base Assembly P2
(Fig. A-8-3)
Fig. A-8
32. Base Assembly P2 (Fig. A-8-3)/
Base Assembly P3 (Fig. A-8-4)
1) Disassemble the base assembly P2 downward while mov ing it toward the arrow (A) direction along with the guide
hole of chassis.
2) Disassemble the base assembly P2 downward while mov ing it toward the arrow (B) direction along with the guide
hole of chassis.
33. Base Loading (Fig. A-8-5)
1) Release 3 hooks (H12, 13, 14) of the base loading, and
then disassemble them upward.
- REVERSE THE MECHANISM.
(No.YD068)1-19
Page 20
Base Tension
(Fig. A-9-1)
(A)
Arm Assembly Idler Jog
(Fig. A-9-2)
(B)(C)
(D)
34. Base Tension (Fig. A-9-1)
1) Release the (A) part of the base tension from the
embossing of chassis.
2) Hold the base tension upward while turning it anti-clock wise.
Chassis
Fig. A-9
35. Arm assembly Idler Jog (Fig. A-9-2)
1) Push both (B), (C) parts in Fig. A-9-2 toward the arrow
direction.
2) Disassemble the arm assembly idler upward.
CAUTIONS
Take care to ensure that the (D) part in the drawing is not
hung to chassis in disassembly.
1-20 (No.YD068)
Page 21
4.3DECK MECHANISM ADJUSTMENT (VCR)
4.3.1 Tools and Fixfures for Service
1. Cassette Torque Meter
1. PUJ42881
1.
300
S
-
T
2
50
H
V
-
20
0
K
R
15
0
S
SRK
VIDEO
CASSETTE
H
V
T
-
-
K
T
R
0
TORQUE
S
50
0
METER
VHT-303
50
15
0
2
00
25
0
300
5. Post Height Adjusting Driver
(Roller driver)
PTU94002
2. Alignment Tape
NTSC: MHP
PAL: MHPE
3. Torque Gauge
3. PUJ48075-2
(No.YD068)1-21
Page 22
4.3.2 Mechanism Assembly Mode Check
Purpose of adjustment : To make tools normally operate by positioning tools accurately.
Fixtures and tools usedVCR (VCP) statusChecking Position
Blank Tape (empty tape)
Eject Mode
(with cassette withdrawn)
1) Turn the VCR on and take the tape out by pressing the
eject button.
2) Separate both top cover and plate top, and check both
the hole (A) of gear cam and the hole (A') of chassis co rrespond (Fig. C-2).
3) If it is done as in the paragraph 2): Turn the gear cam as
in No.2) after mantling the motor assembly L/D.
CHECK DIAGRAM
Mechanism and Mode Switch
4) Undo the screw fixing the deck and the main frame, and
separate the deck assembly. Check both the hole (A) of
gear cam and the hole (A') of chassis correspond (Fig.
C-1).
5) Check the mode S/W on the main P.C. board locates at
a proper position as in (B) of the Fig. (C-1).
6) Connect the deck to the main P.C. board and perform all
types of test.
Gear Cam
(C)
Gear Drive
(B)
Mode S/W
BOTTOM VIEW
TOP VIEW
Fig. C-1
Fig. C-2
Correspondence of the gear cam hole (O)
and the gear drive hole (O)
Motor Assembly L/D
Gear Cam
(A')
(A)
Chassis Hole
Gear Cam Hole
1-22 (No.YD068)
Page 23
4.3.3 Previous Preparation for Deck Adjustment
(Preparation to load the VCR (VCP) with cassette tape not inserted)
(1) Take the power cord from the consent.
(2) Separate the top cover and the plate assembly top.
(3) Insert the power cord into again.
(4) Turn the VCR (VCP) on and load the cassette while push-
ing the lever stopper of the holder assembly CST back-
If doing so, proceeding to the stop mode is done. In this status,
input signals of all modes can be received. However, operation
of the Rewind and the Review is impossible since the take-up
reel remains at stop status and so cannot detect the reel pulse
(however, possible for several seconds).
ward. In this case, clog both holes on the housing rail part
of chassis to prevent detection of the end sensor.
4.3.4 Torque Measuring
Purpose of Measuring : To measure and check the reel torque on the take-up part and the
supply part that performs basic operation of the VCR (VCP) for
smoothly forwarding the tape.
Measure and check followings when the tape is not smoothly
wound or the tape velocity is abnormally proceeded:
VCR (VCP) statusMeasuring methodFixtures and tools used
Try to operate the VCR (VCP) per mode with the
tape not inserted (See 4.3.3 Prior Preparation for
Deck Adjustment).
Measure after adhering and fixing the torque
gauge adaptor to the torque gauge (Fig. C-3-1)
Read scale of the supply or take-up part of the
cassette torque meter (Fig. C-3-2).
Item
Fast forward Torque
Rewind Torque
Play Take-Up Torque
Review Torque
Fast Forward
Rewind
Play
Review
ModeInstrumentsReel MeasuredMeasuring Value
Torque Gauge
Torque Gauge
Cassette Torque Meter
Cassette Torque Meter
Take-Up Reel
Supply Reel
Take-Up Reel
Supply Reel
NOTE
Adhere the torque gauge adaptor to the torque gauge for measuring the value.
Cassette Torque MeterTorque Gauge (600g.cm ATG)
Torque Gauge
Torque Gauge
Adaptor
More than 400g cm
More than 400g cm
40~100g cm
40~210g cm
300
S
-
T
250
H
V
-
200
K
R
150
S
SRK
VIDEO
CASSETTE
H
V
T
-
-
K
T
R
TORQUE
50
0
METER
VHT-303
0
S
50
150
200
250
300
Reel Table
Fig. C-3-2Fig. C-3-1
(No.YD068)1-23
Page 24
4.3.5 Guide Roller Height Adjustment
Purpose of adjustment : To ensure that the bottom surface of the tape can travel along with
the tape lead line of the lower drum by constantly and adjusting
and maintaining the height of the tape.
4.3.5.1Prior Adjustment
Fixtures and tools usedVCR (VCP) statusAdjustment position
Post Height Adjusting
Driver
Play or Review Mode
Adjustment Procedure
1) Travel the tape and check the bottom surface of the
tape travels along with the guide line of the lower drum.
2) If the tape travels toward the lower part of guide line on
the lower drum, turn the guide roller height adjusting
screw to the left
3) If it travels to the upper part, turn it to the right.
4) Adjust the height of the guide roller to ensure that the
tape is guided on the guide line of the lower drum at the
inlet/outlet of the drum. (Fig. C-4-1)
4.3.5.2Fine Adjustment
Fixtures and tools used
Oscilloscope
Alignment tape
Post height adjusting
driver
Measuring tools and
connection position
CH-1: PB RF Envelope
CH-2: NTSC : SW 30Hz
PAL : SW 25Hz
Head switching output
point
RF Envelope output
point
The guide roller height adjusting screw on the
supply guide roller and the take-up guide roller
ADJUSTMENT DIAGRAM
Fig. C-4-1
GUIDE ROLLER
HEIGHT
ADJUSTMENT SCREW
VCR (VCP) statusAdjustment position
Play the standard test
tape.
Guide roller height
adjusting screw
Waveform
P2 POST ADJUSTMENT
1) Play the Alignment tape after connecting the probe of
oscilloscope to the RF envelope output point and the
head switching output point.
2) Tracking control (playback) : Locate it at the center
(Set the RF output to the maximum value via the tracking
control when such adjustment is completed after the
drum assembly is replaced.)
3) Height adjusting screw: Flatten the RF waveform.
(Fig. C-4-2)
4) Move the tracking control (playback) to the right/left.
(Fig. C-4-3)
5) Check the start and the end of the RF output reduction
width are constant.
CAUTIONS
There must exist no crumpling and folding of the tape due
to excess adjustment or insufficient adjustment.
P3 POST ADJUSTMENT
Fig. C-4-2
When the tracking control
locates at the center.
Fig. C-4-2
Connection Diagram
RF ENVELOPE OUTPUT POINT
HEAD RF SWITCHING OUTPUT POINT
Flatten the waveform by
lightly turning the guide
roller height adjustment
screw.
When turning the tracking
control to both sides.
OSCILLOSCOPE
CH-1 CH-2
1-24 (No.YD068)
Page 25
4.3.6 Audio/Control (A/C) Head Adjustment
Purpose of adjustment : To ensure that audio and control signals can be recorded and
played according to the contract tract by constantly maintaining
distance between tape and head, and tape tension between the P3
post and the P4 post.
4.3.6.1Prior Adjustment (performed only when no audio output appears in play of the standard test tape)
Fixtures and tools usedVCR (VCP) statusAdjustment position
Blank Tape
Driver (+) Type 5mm
Play the blank tape
Adjustment Procedure/Adjustment Diagrams
1) Basically use the A/C head assembly adjusted as in
SPEC.
2) Check there is crumpling and folding of the tape around
the A/C head. If it is, Turn and adjust the tilt adjusting
screw to ensure that the tape corresponds to the bottom
guide of the P4, and recheck the tape path after proceed ing play for 4-5 seconds.
3) Where the tape bottom is not equal to Fig. C-5-3, Adjust
the height by using the height adjusting screw (B) and
then readjust it by using the tilt adjusting screw (C).
CAUTIONS
Always check the height of the A/C head since most ideal
height of A/C head can be obtained when the bottom part
of the tape is away 0.2 ~ 0.25mm from the bottom part of
the A/C head.
A/C Head
P4
Tape
0.2~0.25mm
Tape
Azimuth
Adjustment
Screw(A)
Fig. C-5-1
X-Value Adjustment
Hole
Fixed Screw
A/C Head Assembly
Fig. C-5-2
Fig. C-5-3
Tilt Adjustment
Screw(C)
Height Adjustment
Screw(B)
(No.YD068)1-25
Page 26
4.3.6.2Tape Path Check between Pinch Roller and Take up Guide (Check in the Rev Mode)
1) Check the tape pass status between the pinch roller and the
take-up guide.(Check there is crumpling of the tape pass and
folding of the take-up guide.)
(1) When holding of the take-up guide bottom occurs
Turn the tilt adjusting screw (C) clockwise and travel it stably to ensure there is no crumbling or folding of the tape.
(2) When holding of the take-up guide top occurs
Turn the tilt adjusting screw (C) anti-clockwise and travel it
stably to ensure there is no crumbling or folding of the tape.
4.3.6.3Fine Adjustment (Azimuth Adjustment)
2) Check there is folding of the tape at the bottom or top of the
take-up guide in cutting-off the REV mode
CAUTIONS
If the RF waveform is changed after adjusting the A/C head,
perform fine adjustment to ensure the RF waveform is flatened.
Fixtures and tools usedConnection positionVCR (VCP) statusAdjustment position
Oscilloscope
Standard test tape
(only for SP)
Driver (+) Type 4mm
Adjustment Procedure
1) Connect the probe of Oscilloscope to the audio output
jack.
2) Ensure that Audio 1KHz, 7KHz output is flattened at the
maximization point by adjusting the Azimuth adjusting
screw (A).
Purpose of adjustment : To maintain compatibility with other VCR (VCP).
Fixtures and tools usedConnection positionVCR (VCP) statusAdjustment position
Oscilloscope
Standard test tape
(only for SP)
Driver (+) Type 4mm
CH-1: PB RF Envelope
CH-2: NTSC ; SW 30Hz
PAL:SW 25Hz
Head switching output
point
RF Envelope output
point
Play the Alignment tape
Left
Grove of Base A/C
Right
7KHz
Adjustment Procedure
1) After releasing the auto tracking, lightly turn the fixing
screw. Turn the (+) type driver on the X-dis-tance adju sting hole to the right or left. Adjust the RF envelope
level to the maximum point and then fix the fixing screws.
2) For the 31 m head, adjust it with the SP tape recorded
in the width of 31 m since the head travels on the tape
track only for SP with the width of 58 m.
1-26 (No.YD068)
Connection Diagram
X-value Adjusting Hole
Fixing Screw
Azimuth
Adjustment
Screw(A)
Fig. C-6
RF ENVELOPE OUTPUT POINT
HEAD RF SWITCHING OUTPUT POINT
Tilt Adjusting Screw (C)
Height Adjusting
Screw (B)
OSCILLOSCOPE
CH-2CH-1
Page 27
4.3.8 Adjustment after Drum Assembly (Video Heads)
Purpose of adjustment : To adjust and stabilize the height change, X-distance change, etc
depending on the guide roller after assembling the drum.
Fixtures and tools usedConnection positionVCR (VCP) statusAdjustment position
Oscilloscope
Alignment tape
(only for SP)
Post Height Adjusting
Driver
Driver (+) Type 5mm
CH-1: PB RF Envelope
CH-2: NTSC : SW 30Hz
PAL:SW 25Hz
Head switching output
point
RF Envelope output
point
Checking/Adjustment Procedure
1) Play the blank tape and check whether the guide roller
crumbles or wrinkles the tape and adjust it if necessary.
2) Check that the RF envelope output waveform is flat, and
adjust the height of the guide roller while playing the
alignment tape.
3) Adjust the switching point.
4) Check the RF envelope output is the maximum when
the tracking control locates at the center. If not maximum,
set up to ensure that RF envelope output becomes the
maximum by turning the (+) type driver on the base A/C
groove.
4.3.9 Check of Traveling Device after Deck Assembly
4.3.9.1Audio, RF Normalization Time (Locking Time) Check in Play after CUE or REV
Play the blank tape.
Play the Alignment tape.
Connection Diagram
RF ENVELOPE OUTPUT POINT
HEAD RF SWITCHING OUTPUT POINT
Waveform
V1/V MAX = 0.7
V1/V MAX = 0.8
RF ENVELOPE OUTPUT
Fine adjustment of
guide roller
Switching Point
Tracking Preset
X-value
OSCILLOSCOPE
CH-2CH-1
V2V1V1
Fixtures and tools usedMeasuring standardConnection positionVCR (VCP) status
1) Check that locking time of the RF and Audio waveform is
fallen within the measuring standard in conversion of the
play mode from the CUE or the REV mode.
4.3.9.2Check of Tape Curl and Jam Status
2) Readjust the paragraph 4.3.6 and 4.3.7 if it deviates
from the standard.
Fixtures and tools usedFixtures and tools usedFixtures and tools used
E-240 Tape
E-160 Tape
Checking Procedure
1) Check there is no abnormality of every traveling post
status.
2) There must be no abnormal operation of the counter in
There must be no jam or curl at the
first, middle and end position of tape.
occurrence of folding of the bottom tape. There must be
not abnormality of audio signal in damage of the top tape.
3) If there is abnormality, readjust the adjustment paragraph
4.3.5 and 4.3.6.
Travel the tape at the position
of its first and end.
(No.YD068)1-27
Page 28
4.4PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION (VCR)
4.4.1 Checking Points prior to Repair
Following abnormal phenomena may be repaired by removal of
foreign materials and oil supply. Check oiling is required at the
checking set or cleaning status is complete.
Determine that necessity of checking and repair the set exists after checking the using period of the set together with the user. In
this case, followings must be checked:
Phenomena
Color beatPollution of Full-Erase Heado
S/N, Color FadedPollution of Video Heado
Horizontal, Vertical Jitteo
Poor Sound, Low Soundo
No tape wound or tape
wound loosely.
FF or REW impossible,
or slow turning
Tape loosely wound in
REV or Unloading
Checking Points and
Cause
Pollution of Video Head or
Tape Transport System
Pollution of Audio/Control
Head
Pollution of Pinch Roller or
Belt Capstan Belt
Deterioration of Clutch
Assembly D37 Torque
Pollution of Drum and
Traveling Device
Replace-
ment
o
o
Fig. C-9-3
CAUTIONS
If operation of the position with (O) mark is abnormal even
after removing cause, replace it with substitute product since
it shows damage or wearing.
F/E Head
Video Head
Fig. C-9-1 TOP VIEW
A/C Head
Pinch Roller
Belt Capston
Clutch
Assembly A37
Fig. C-9-2 BOTTOM VIEW
* No. (1) ~ (12) shows sequence that the tape moves from the supply reel to the take-up reel.)
(3) F/E Head
(5) Drum Assembly
(Video Head)
(4) Base Assembly P2
(2) Tension Post
(1) Supply Reel
Fig. C-9-3 Tape Transport System
1-28 (No.YD068)
(6) Base Assembly
P3
(7) A/C Head
(8) P4 Post
(10) Pinch Roller
(11) Take-up Guide
Post
(9) Capstan Shaft
(12) Take-up Reel
Page 29
4.4.2 Essential Check and Repair
Recording density of the video is far higher than the audio.
Therefore video parts are very precise so as to allow only error
of 1/1000mm or so in order to maintain compatibility with other
videos.
If one of these parts is polluted or old, same phenomena will
appear as they are damaged.
To maintain clear screen, regular check, replacement of old and
damaged parts and oil supply, etc are essential.
4.4.3 Regular Check and Repair
Check and repair schedule is not constant since they vary depending on method that the consumer uses video and environment where the video is installed at.
However, for the video used by common household, good screen
will be maintained if regular check and repair per 1,000 hour is
performed. The following chart shows relationship between using time and checking time:
Time
Requiring
Checking
Average
hours used
per day
One hour
Two hours
Three hours
About
1 year
About
18 months
About
3 years
4.4.4 Tools for Check and Repair
(1) Grease: Floil G-3114 (KANTO) or equivalent grease
(1) Removal of foreign material from video head (Fig. C-9-4)
Firstly try to use a cleaning tape.
Use a cleaning patch if foreign materials are not removed
with the cleaning tape due to severe dirty of the head.
Soak the cleaning patch in alcohol and put it to the head tip.
Smoothly turn the drum (turning cylinder) to the right or left
(In this case, the cleaning patch must not be moved verti-
cally).
After completely drying the head, test the traveling status
of the tape.
If alcohol (Isopropyl Alcohol) remains at the video head, the
tape may be damaged when this solution touches with the
head surface.
Never use a cloth bar (commercial sale)
(2) Wipe the tape transport system and the drive system with
the cleaning patch soaked in alcohol (Isopropyl Alcohol)
when removing foreign materials from them.
1) The part touched with the traveling tape is called as tape
transport system. The drive system consists of parts to
travel the tape.
2) Care must be exercised so that unreasonable force to
change the pattern will be applied to the tape transport
system during removal of foreign materials.
Cleaning Patch
(Cloth)
Soak alcohol
(Isopropyl Alcohol).
Drum
(Turning Cylinder)
Head Tip
Smoothly turn the drum (turning
cylinder) touching the soft surface
to the head tip surface.
Fig. C-9-4
(No.YD068)1-29
Page 30
4.4.5.2Grease Applications
(1) Grease Application Method
Apply grease by using a cloth swab or brush. Care must be
exercised so that excess quantity should not be used. If the
excessive quantity is applied, wipe it with the gauze soaked
in alcohol (Isopropyl Alcohol).
(1) Inner Side Surface and Top
Surface of Loading Path
(2) Stable Adhesion Part of Base
P2, P3
(3) Arm Pinch Shaft
2
(4) Gear Wheel Shaft
(5) Reel S. T. Shaft
(1) (2) (3) (4): KG-684G
(Green)
(5): PL-433 (Yellow)
(2) Regular Grease Application
Apply grease to the designated application position every
500 hour.
NOTE: POSITION OF GREASE APPLICATION
(1) Inner Side Surface and Top
Surface of Loading Path
(2) Stable Adhesion Part of Base
P2, P3 Coil
(3) Gear Cam Shaft
(4) Gear Drive Shaft
(5) Clutch Shaft Groove
Guide Part on the Plate Slider
(6)
Side Wall (Left)
(7)
Guide Part on the Plate Slider
Side Wall (Right)
(1) (2) (3) (4) (5) (6) (7): KG 684G (Green)
a) Insert the Alignment Tape and play.
Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the "ATR" is blink after the
Alignment Tape is inserted.
b) Connect the CH1 of the oscilloscope to the H/SW(TP) and CH2 to the Video Out for the VCR.
c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW(TP) and then check the distance (time
difference), which is from the selected A(B) Head point of the H/SW(TP) signal to the starting point of
the vertical synchronized signal, to 6.5H 0.5H (412 s, 1H=63 s).
PG Adjustment Method
a-1) Playback the Alignment tape
b-2) Press the "OK(ENTER)" key on the Remote controller and the "REC" key on the Front Panel the same
time, then it goes in to Tracking initial mode.
c-3) Repeat the above step(No.b-2), then it finishes the PG adjusting automatically.
d-4) Stop the playback, then it goes out to PG adjusting mode after mony the PG data.
CONNECTION
WAVEFORM
H/SW
(TP)
V.Out
OSCILLOSCOPE
CH1 CH2
R/C KEY
V.outH/SW
(TP)
H/SW
6.5H(412 s)
Composite
VIDEO
1-32 (No.YD068)
Page 33
4.6DECK MECHANISM PARTS LOCATION (DVD)
Top View (With Tray)
Top View (Withou
t Tray)
Procedure
Starting No.
1
Main Base
Clamp Assembly
1
1, 2
1, 2, 3
1, 2, 3, 4
1
1, 6
1, 2, 6
1, 2, 6, 8
1, 2, 6, 8, 9
1, 2, 7
1, 2, 7
1, 2
1, 2 ,13
1, 2, 13, 14
1, 2, 7, 12, 13, 14
1, 2, 13
1, 2, 7, 12, 13,
14, 15, 16, 17
2
Disc
3
Plate Clamp
4
Magnet Clamp
5
Clamp Upper
6
Tray Disc
Base Assembly Sled
7
8
Gear Feed
Gear
9
Middle
10
Gear Rack
11
Rubber Rear
Frame Assembly
12
Up/Down
13
Belt Loading
14
Gear Pulley
15
Gear Loading
16
Guide Up/Down
PWB Assembly
17
Loading
18
Base Main
PartsFixing Type
4 Screws,
1 Connector
1 Locking Tabs
1 Screw
1 Screw
1 Locking Tab
1 Locking Tab
1 Locking Tab
1 Hook
2Screw
2 Locking Tabs
Disass
embly
Bottom
Bottom
Figure
5-1
5-1
5-1
5-1
5-1
5-2
5-3
5-3
5-3
5-3
5-3
5-4
5-4
5-4
5-4
5-4
5-4
5-4
Bottom View
Note
When reassembling, perform the procedure in
reverse order.
The "Bottom" on Disassembly column of above
Table indicates the part should be disassembled
at the Bottom side.
(No.YD068)1-33
Page 34
PLATE CLAMP
MAGNET CLAMP
CLAMP UPPER
MAIN BASE
DISC CLAMP ASSEMBLY
TRAY DISC
HOLDER
(Fig. A)
BASE MAIN
1.Main Base (Fig. 5-1)
1-1. Clamp Assembly Disc
1) Place the Clamp Assembly Disc as Fig. (A)
2) Lift up the Clamp Assembly Disc in direction of
arrow(A).
3) Separate the Clamp Assembly Disc from the Holder
Clamp.
1-1-1. Plate Clamp
1) Turn the Plate Clamp to counterclockwise direction
and then lift up the Plate Clamp.
1-1-2. Magnet Clamp
1-1-3.Clamp Upper
BASE MAIN
LEVER
BASE MAIN
BOTTOM SIDE VIEW
Fig. 5-2Fig. 5-1
2. Tray Disc (Fig. 5-2)
1) Insert and push a Driver in the emergency eject
hole(A) at the right side, or put the Driver on the
Lever(B) of the Gear Emergency and pull the Lever(B)
in direction of arrow so that the Tray Disc is ejected
about 15~20mm.
2) Pull the Tray Disc until it is separated from the Base
Main completely.
1-34 (No.YD068)
Page 35
GEAR RACK
RUBBER DAMPER
(S3)
PINION GEAR
MIDDLE GEAR
SCREW INSERTION TORGUE CONTROL
(800gf DOWN)
RUBBER DAMPER
Distinguish upper and
lower sides
(Assemble with care)
RUBBER DAMPER
Distinguish upper and
lower sides
(Assemble with care)
BASE PU
GEAR RACK
SPINDLE MOTOR ASSEMBLY
3.Base Assembly Sled (Fig. 5-3)
1) Release 4 Screw(S2).
2) Disconnect the FFC Connector(C1)
3-1. Gear Feed
3-2. Gear Middle
RUBBER DAMPER
GENERAL PICK UP ASSEMBLY
Fig. 5-3
(S2)
3-3. Gear Rack
1) Release the Scerw(S3)
4. Rubber Rear (Fig. 5-3)
(S2)
(No.YD068)1-35
Page 36
GUIDE UP/DOWN
GEAR PULLEY
SCREW INSERTION
TORGUE CONTROL
(800gf DOWN)
GUIDE UP/DOWN
GEAR LOADING
(L4)
BELT LOADING
BASE MAIN
(A)
(L5)
FIG. (A)
(B)
PWB ASSEMBLY LOADING
(A)
(B)
(C)
(C2)
(S5)
(A)
(B)
GUIDE UP/DOWN
(L3)
(L6)
(L6)
BASE MAIN
(H1)
(S4)
UP/DOWN FRAME ASSEMBLY
FIG. (B)
GUIDE UP/DOWN
FIG. (C)
5. Frame Assembly Up/Down (Fig. 5-4)
Note
Put the Base Main face down(Bottom Side)
1) Release the screw(S4)
2) Unlock the Locking Tab(L3) in direction of arrow and
then lift up the Frame Assembly Up/Down to separate
it from the Base Main.
Note
When reassembling move the Guide Up/Down in direction
of arrow(C) until it is positioned as Fig.(C).
When reassembling insert (A) portion of the Frame Assembly Up/Down in the (B) portion of the Guide Up/Down
as Fig.(B)
6. Belt Loading(Fig. 5-4)
Note
Put the Base Main on original position(Top Side)
7. Gear pulley (Fig. 5-4)
1) Unlock the Locking Tab(L4) in direction of arrow(B) and
then separate the Gear Pulley from the Base Main.
Fig. 5-4
8. Gear Loading (Fig. 5-4)
9. Guide Up/Down (Fig. 5-4)
1) Move the Guide Up/Down in direction of arrow(A) as
Fig.(A)
2) Push the Locking Tab(L5) down and then lift up the
Guide Up/Down to separate it from the Base Main.
Note
When reassembling place the Guide Up/Down as Fig.(C)
and move it in direction arrow(B) until it is locked by the
Locking Tab(L5). And confirm the Guide Up/Down as Fig.(A)
10. PWB Assembly Loading (Fig. 5-4)
Note
Put the Base Main face down(Bottom Side)
1) Release 1 Screws(S5)
2) Unlock the Loading Motor (C2) from the Hook (H1) on
the Base Main.
3) Unlock 2 Locking Tabs(L6) and separate the PWB
Assembly Loading from the Base Main.
11. Base Main(Fig. 5-4)
1-36 (No.YD068)
Page 37
SECTION 5
TROUBLESHOOTING
5.1ELECTRICAL TROUBLESHOOTING GUIDE (VCR PART)
5.1.1 Power(SMPS) CIRCUIT
(1) No 5.3VA
No 5.3VA
YES
Is the FR101
Normal?
YES
Is the BD101
Normal?
YES
Is the R101
Normal?
YES
Is Vcc (9V - 18V) supplied to IC101 Pin2?
YES
Are the D125
normal?
Is there about 2.5V
at the IC103 Pin1?
YES
NO
NO
NO
NO
NO
NO
Replace the FR101
(Use the same ICW)
Replace the
BD101
Replace the R101
Is the D102
normal?
Replace the R125
Replace the IC103
Check or Replace
the D102
Is the D123
normal?
YES
Is the D124
Normal?
YES
Is the D121
Normal?
YES
Power Line of Main
PCB is short
NO
NO
NO
Replace the D123
Replace the D124
Replace the D121
(No.YD068)1-37
Page 38
(2) No 5.0V_D
(3) No 5.0V_T
No 5.0V_D
YES
Is the Vcc(5.3V) supplied to Q165 Emittor?
YES
Is the Q162 Base
'H'?
YES
Check or Replace
the Q165
(4) No 3.3V
No 3.3V
YES
NO
NO
Check or Replace
the D125
Check the PWR CTL
"H" signal from -com
No 5.0V_T
YES
Is the Vcc(5.3V) supplied to Q163 Emittor?
YES
Is the Q162 Base
'H'?
YES
Check or Replace
the Q163
(5) No 33V
No 33V
YES
NO
NO
Check or Replace
the D125
Check the PWR CTL
"H" signal from -com
Is there about 3.8V
at the IC131 pin1?
YES
Is there about 3.3V~5V
at the IC131 pin4?
YES
Check the IC131
and Replace
NO
NO
Check or Replace
the D123
Check the PWR CTL
"H" signal from -com
Is the Vcc(33V) supplied to Q161 Emittor?
YES
Is the Q162 Base
'H'?
YES
Check or Replace
the Q161
NO
NO
Check or Replace
the D121
Check the PWR CTL
"H" signal from -com
1-38 (No.YD068)
Page 39
(6) No Motor_Vcc (To Cap, Drum Motor )
(7) No REG 12V
No Motor_Vcc
YES
Is the Vcc(14V)
supplied to C134?
YES
Check or Replace
the Cap / Drum
NO
Check or Replace
the D124
No REG 12V
YES
Is the Vcc(14V) supplied
NO
to Q165 Collector?
YES
Is the Vcc(14V) sup-
NO
plied to Q165 Base?
YES
Check or Replace
the Q165
Check or Replace
the D124
Check the PWR CTL
"H" signal from -com
(No.YD068)1-39
Page 40
5.1.2 SYSTEM/KEY CIRCUIT
(1) AUTO STOP
Auto Stop
YES
Does the SW25 waveform
appear at the IC501
Pin23?
NO
Check the Drum Motor
signal.
YES
Do the T-UP Reel Pulses
NONO
appear at the IC501 Pin3?
YES
Replace the IC501.Check the Power Circuit.
Do T/UP Reel Pulses
appear at the Q514 Base
terminal?
YESYES
Replace the T/UP Reel
Sensor (RS501).
Does 5.0V appear at the
RS501?
(2) The unstable loading of a Cassette tape
The unstable loading of a
Cassette tape
YES
Is 12V applied to the
PMC01 Pin8?
NO
Check the Power.
NO
YES
Does the "H" signal appear
at the IC501 Pin32 during
NO
inserting the CST ?
YESYES
Does the "L" signal appear
at the IC501 Pin19 during
inserting the CST?
YES
NO
Check the CST SW and
the peripheral circuitry.
Check the Deck
Mechanism.
Caution : Auto stop can occur because Grease or Oil is dried up
Is 5.0V applied to the
R544 ?
NO
Refer to SMPS 5.3VA
troubleshooting.
Check the IC501
Pins 86, 87, 88, 89.
1-40 (No.YD068)
Page 41
5.1.3 SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
YES
Does the Noise level of the
screen change
periodically?
YES
Does the CFG waveform
appear at the IC501
Pin67?
YES
On tracking do the CTL
pulses move?
YES
Does the Video Envelope
waveform appear at the
IC501 Pin82?
YES
Replace the IC501.
(2) When the Drum Motor
doesn't run.
When the Drum Motor
doesn't run,
YES
Does 12V appear at the
PMC01 Pin8?
YES
Does 2.8V appear at the
PMC01 Pin12?
YES
Check the connector
(PMC01) and the Drum
Motor Ass'y.
NO
NO
NO
NO
Replace the IC501.
Refer to "When the Y signal
doesn't appear on the
screen in PB Mode".
Refer to "(2)
No 12VA of Power section"
Do the Drum PWM Pulses
appear at the IC501
Pin34?
YES
Aren't the foil patterns and
the Components between
IC501 Pin34 and PMC01
Pin12 short?
YES
Do the DFG Pulses appear
at the IC501 Pin104?
YES
Do the Drum PWM Pulses
appear at the IC501
Pin34?
NO
NO
NO
Do the DFG Pulses appear
at the PMC01 Pin11?
YES
NO
Replace the Cap M.
Aren't the foil patterns and
the Components between
IC501 Pin 104 and PMC01
Pin11 short?
Replace the IC501.
Aren't the connecting patterns and the Components
between IC501 Pin34 and PMC01 Pin12 short?
(No.YD068)1-41
Page 42
(3) When the Capstan Motor doesn't run,
When the Capstan Motor doesn't run,
Does 12VA appear at the PMC01?
YES
Does 2.8V appear at the PMC01?
YES
Check the PMC01 and the Capstan
Motor Ass'y.
Aren't the foil patterns and Components
between IC501 Pin33 and PMC01
Pin9 short?
Does the CFG signal come into the
IC501 Pin67?
NO
NO
YES
YES
Refer to "SMPS(CAPSTAN/12Volt)
Trouble Shooting".
Does the PWM signal appear at the
IC501 Pin33?
NO
Does the CFG signal appear at the
PMC01 Pin1?
NO
Check the Capstan Motor Ass'y.
YES
Does the Capstan PWM signal appear at
the IC501 Pin33?
YES
Aren't the foil patterns and Components
between IC501 Pin33 and PMC01
Pin9 short?
(4) KEY doesn't working
KEY doesn't working.
Is 5V applied to the IC501
NO
Pin36?
YES
Does LED or FLD change
when a function button is
NO
pressed?
NO
Aren't the foil patterns and component
between IC501 Pin67 and PMC01
Pin1 short?
NO
Replace the IC501.
Refer to "SMPS 5.3VA
Trouble Shooting".
Replace the defective
switches.
1-42 (No.YD068)
Page 43
5.1.4 Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Does the Video signal
appear at the IC301 Pin48?
YES
Is 5V applied to the IC301
Pins18, 24, 42, 55, 72, 91?
YES
Does the Video signal
appear at the IC301 Pin65?
YES
Does the Video signal
appear at the IC501 Pin47?
YES
Does the Video signal appear
at the Emitter terminal of the
Q309?
NO
NO
Check the 19Pin of Tuner.
Check the 5.0VT, 5.3VA
Line. (Power Circuit)
NONO
Is I2C BUS signal applied to
the IC301 Pins68, 69?
YES
NO
Chck the path of the signal
between the IC301 Pin65
and IC501 Pin49.
NO
Does the 12VT, 5.3VA
appear at the Emitter
NO
terminal of the Q309.
YES
Check the System Circuit.
(Refer to 'SYSTEM I
2
C BUS
CHECK Trouble Shooting')
Check C316. (AGC)
YES
Replace the IC301.
Replace the Q309.
Check the 12VT, 5.4VA
Line. (Power Circuit)
(No.YD068)1-43
Page 44
(2) When the Y(Luminance) signal doesn't appear on the screen in PB Mode,
Is 5.0VT, 5.3VA applied to the
IC301 Pins24, 42, 55, 72, 91?
YES
Is the I2C Bus siganl applied
to the IC301 Pins68, 69 ?
YES
Is the I2C Bus siganl applied
to the IC301 Pins68, 69 ?
YES
NO
Check the line of the 5.0VT,
5.3VA Line. (Power Circuit)
NO
Refer to 'SYSTEM I
2
C BUS
CHECK Trouble Shooting'.
NONO
Is the V.H.S/W signal
applied to the IC301 Pin70?
YES
Is V.H.S/W "H" about 3.4V
NO
at the IC301 Pin70?
YES
Clean the Drum.
NO
Check the System Circuit.
(IC501 Pin23)
Check the V.H.S/W level.
(Check R303, R304)
Replace the IC301.
Does the Y(Luminance) RF
signal appear at the IC301
Pin79?
YES
Is the Y(Luminance) Video
waveform showed up at
theIC301 Pin43?
YES
Replace the IC301.
NO
NO
Check the path of the
Y(Luminance) RF signal.
(Check the C312)
Check the path of the
Y(Luminance) RF signal.
(Check C327)
YES
YES
1-44 (No.YD068)
Page 45
(3) When the C(Color) signal doesn't appear on the screen in PB Mode,
Is 5.0VT/5.3VA applied to the
IC301 Pins24, 42, 55, 72, 91.
YES
Is the Color Rotary signal
applied to the IC301
Pin70?
YES
Is Color Rotary "H"
about 3.4V?
YES
Does the Color signal
appear at the IC301
Pin25 ?
YES
NO
Check the line of the 5.0VT/
5.3VA Line. (Power Circuit)
NO
Check the Color Rotary
Circuit. (IC501 Pin98 )
NO
Check the Color Rotary
level. (Check the R303)
NONO
Does the X301(4.43MHZ)
oscillate?
Does the Color signal
NO
appear at the IC301 Pin21?
Replace the X301.
Check the Color Pass.
YES
Replace the IC301.Replace the IC301.
(No.YD068)1-45
Page 46
(4) When the Video signal doesn't appear on the screen in REC Mode,
Is the EE signal normal?
YES
Is 5.0VT/5.3VA applied to the
IC301 Pins24,42,55,72,91?
YES
Does PB Mdoe operate
normally?
YES
Does the RF signal appear
at the IC301 Pin78?
YES
NO
NO
NO
NO
Check EE Mode.
Check the line of the 5.0VT/
5.3VA Line.(Power Circuit)
Check PB Mode.
Is the REC 'H' signal
(about 4V) applied to the
IC301 Pin80?
YES
Check REC Luminance
Pass & Color Pass.
NO
YES
Check the System of REC
'H'. (the IC501 Pin27
/ the D301)
Replace the IC301.
Does the REC RF signal
appear at the IC301
Pins88,89,94,95?
YES
Check the Drum &
Drum Connector
NO
Check the circuit of the
IC301 Pins85, 86.
YES
1-46 (No.YD068)
Page 47
5.1.5 Hi-Fi CIRCUIT
(A) No Sound(EE Mode)
YES
No Sound.
Check the TU Audio of IC801
Pins2, 3.
Check the DVD Audio of IC801
Pins4, 5.
Check the AV1 Audio of IC801
Pins6, 7.
Check the AV2 Audio of IC801
Pins8, 9.
Check the AV3 Audio of IC801
Pins10, 11.
Check the Vcc of IC801 Pins34, 40,
IC802 Pin13.
NO
NO
NO
NO
NO
YES
NO
Check the IC751 Pins30, 31.
Check the DVD Audio OUT.
(JK902 DVD_A_L_L/R).
Check the Scart1 Jack.
(SC901 Scart1 Audio in Pins2, 6).
Check the Scart2 Jack.
(SC901 Scart2 Audio in Pins2, 6).
Check the front Jack.
Check the Power 5.0V, 12VT.
YES
Check the IIC Clock and DATA at
IC801 Pins42, 43.
YES
YES
YES
Check the JK902, SC901.
NO
NO
NO
Check the IC501 Pins17, 18.
Replace IC801.Check the Audio of IC801 Pins16, 17.
Replace IC802.Check the Audio of IC802 Pins1, 14.
(No.YD068)1-47
Page 48
(B) Hi-Fi Playback
PB mode
No Sound.
YES
YES
Check the Vcc of IC801
NO
(Pins34, 40)
YES
Check the Hi-Fi Selection switch.
NO
(IC801 Pin41) and the Tape quality.
YES
Is the RF Envelope at
NO
IC801 Pin44 over 2Vp-p?
YES
Check IC801 Pin42(Data),
NO
Pin43(Clock)
YES
Do Audio Signals appear at
NO
IC801 Pin16(L-CH), 17(R-CH)?
YES
Do Audio Signals appear at
NO
IC802 Pin10(L-CH), 16(R-CH)?
YES
Check Power 5.0V, 12VT.
Check IC501 Pin26
(A.H/SW)
Check the parts of -COM
(IC501 Pins17, 18)
Check the Connection at
P3D01 Pins7, 9.
Check the A.IN line of
IC802(C850, C852)
Do Audio Signals appear at
IC802 Pins11, 16?
Do Audio Signals appear at
JK902?
1-48 (No.YD068)
NONO
Check the Vcc of IC802
Pin13.
YESYES
Replace IC802.
NO
Check the Jack(JK902)
Check Power.
Page 49
(C)
Hi-Fi REC.
It can't be recorded Hi-Fi Audio
signal.
YES
YES
Check Vcc of IC801.(Pins34, 40)
YES
Check IC801 Pin42(Data), Pin43(CLOCK).
YES
Do Audio signals appear at IC801
Pins16, 17?
YES
Do FM Audio signals appear at IC801
Pin36?
YES
Check the Contact Point of Drum
Connector if good then Replace the Drum.
NO
NO
NO
NO
Check Power 5V, 12V.
Check ports of -COM.
(IC501 pins 17, 18)
Check Audio input signal of IC801
Pins2, 3(TU.A.), 4, 5(DVD.A.),
6, 7(AVI.A.), 8, 9(AV2.A.), 10, 11(AV3.A.).
Replace IC801.
(No.YD068)1-49
Page 50
5.1.6 Tuner/IF CIRCUIT
(A) No Picture on the TV screen
No picture on the TV
screen
YES
Does the Video signal at
the TU701 Pin19.
YES
Is 33VT applied to TU701
Pin17?
YES
Is 5VT applied to TU701
Pin4?
YES
Does the Clock signal
appear at TU701 Pin12?
YES
Does the data signal
appear at TU701 Pin13?
YES
Replace Tuner.
NONO
NO
NO
NO
Hi-Fi REC.
Check 5V line.
Check the lIC Clock Signal
of -COM Pin18.
Check the lIC Data Signal
of -COM Pin17.
Does Sync appear at
NO
IC501 Pin111.
YES
Does the Video signal at
NO
the IC501 Pin47.
YES
Does the Video signal at
NO
the IC301 Pin61.
YES
Does the Video signal at
NO
the IC903 Pin6.
YES
Check the signal flow from IC903
Pins26, 27 to SC901 Pin19.
Check the signal flow from
TU701 Pin19 to IC301 Pin48.
Check the signal from IC301
Pin65 to IC501 Pin49.
Check the signal from IC501
Pin47 to IC301 Pin56.
Check the signal from IC903
Pin6 to IC301 Pin61.
1-50 (No.YD068)
Page 51
(B) No Sound
No Sound.
YES
Check the Vcc of IC751 Pins1, 11, 19,
22, 33.
YES
Check the Tuner SiF signal at IC751
Pin2.
YES
Check the oscillator of IC751 Pins5, 6.
YES
Check the Audio of IC751 Pins30, 31.
YES
Check the Audio of IC801 Pins2, 3.
YES
NO
NO
NO
NO
NO
Check 5.0V Line.
Check the Tuner SIF of TU701 Pin22.
Replace X751
Check the IIC Clock and Data at IC751
Pins12, 13.
Check the signal flow from IC751
Pins30, 31 to IC801 Pins2, 3.
Check the Audio of IC801 Pins16, 17.
YES
Check the Audio of IC802 Pins3, 5.
YES
Check the Signal flow from IC802
Pins3, 5, SC901 Pins1, 3.
NO
NO
Check the IIC Clock and Data at IC801
Pins42, 43.
Check the signal flow from IC801
Pins16, 17 to IC802 Pins11, 16.
(No.YD068)1-51
Page 52
5.2MECHANISM TROUBLESHOOTING GUIDE (VCR PART)
5.2.1 Deck Mechanism
A.
No Auto Rewind operates.
YES
Is output of the end sensor “H”?
“H”: 3.5V or less
“L”: 0.7V –1V or less
NO
YES
Is voltage at both ends of the
IR LED 0.8V-1.5?
YES
Is the Syscon checked?
B.
No F/R operates.
YES
Is the current mode an F/R
mode?
NO
NO
Is the end sensor Vcc applied at
5V?
YES
Replace the end sensor.
Replace the LED.
Check the assembly position of
the Mode S/W.
NO
Check the Syscon power supply.
YES
Does the Capstan motor rotate?
YES
Does the T/up and the supply
reel Operate?
YES
Check the Syscon circuit.
1-52 (No.YD068)
NO
Is normal voltage applied at the
Vcc1 and the Vcc2 of the
Capstan motor?
YES
Is the Vctl terminal voltage of the
Capstan Motor applied at more
than 4V?
YES
Replace the Capstan motor.
NO
Check the Servo, Power
circuit.
Page 53
C.
Auto Stop operates.
(PLAY/CUE/REV)
Check the assembly mode.
Check the spring pinch.
Does the pinch roller attached to
the Capstan shaft turn in operation of the Play/Cue/Rev.
YES
Does the T/UP or the supply
reel pulse occur?
YES
Check the Syscon, -com.
D.
No cassette loading is done.
Insert the cassette.
NO
NO
Is output of the DFG, DPG
normal?
YES
Check the Servo, Syscon.
Replace the reel sensor.
NO
Replace the drum motor.
YES
Is operation of the lever
assembly S/W normal?
YES
Does output of the CST IN S/W
change?
(In insertion of the REC tape:
"L"_"H"_"L")
(In insertion of the REC prevention tape:
"L"_"H"_"L"_"H")
YES
Check the Syscon circuit.
NO
NO
NO
Check the holder assembly CST.
Is the CST IN S/W normal?
YES
Check the Syscon circuit.
NO
Replace the CST IN S/W.
(No.YD068)1-53
Page 54
E.
No tape winding is done in
play.
Is the pinch roller attached to the
Capstan shaft in operation of play?
YES
Does the T/up reel operate?
YES
Does the Capstan motor turn?
YES
Does the drum motor turn?
YES
Is the DPG, DFG normal?
NO
NO
NO
Check the assembly mode?
Is the Capstan belt hung?
YES
Check the clutch and the idler
assembly.
Is normal voltage applied to the
capstan motor Vcc1, Vcc2?
YES
Is the Vctl terminal voltage of
the Capstan motor applied at
more than 4V?
NO
Hang the Capstan belt.
NO
Check the Servo, power circuit.
YES
Are the T/up and the reel sensor
normal?
YES
Check the Syscon circuit.
NO
YES
Replace the Capstan motor.
Is the Vcc voltage of the drum
motor normal?
YES
Is the Vctl terminal voltage of the
drum motor at more than 2.3V?
YES
Replace the drum motor.
NO
Check the Syscon circuit.
NO
Check the Syscon circuit.
1-54 (No.YD068)
Page 55
5.2.2 Front Loading Mechanism
A.
No cassette insert is done.
Does the lever assembly
switch operate?
YES
Is the Vcc of the main P.C.B
assembly?
YES
Is voltage between the cassette
switch terminal and the GND on
the main P.C.B assembly?
YES
Check the mode switch position
and the Syscon circuit.
NO
NO
NO
Is the lever assembly switch
spring normal?
NO
Add or replace the lever
assembly switches spring.
YES
Does the CST IN switch
operate normally?
NO
Replace the F/L switch.
YES
Check the Syscon circuit.
Check the power circuit.
Is there short between the cassette switch terminal
and the GND on the main P.C.B assembly?
YES
Replace the main P.C.B assembly or remove the short part.
NO
Replace the CST IN switch.
B.
No cassette eject is done.
Does the L/D motor turn in reverse?
YES
Does the lever assembly switch operate?
YES
Does the arm assembly F/G operate?
YES
Does the opener door operate?
NO
Check the L/D motor and the drive IC.
NO
Replace the lever assembly switch.
NO
Replace the arm assembly F/L
NO
Replace the opener door.
(No.YD068)1-55
Page 56
C.
No safe adherence of tape is done.
Is cassette insert done?
YES
Does the opener lid operate?
YES
Does the gear rack F/L operate?
NO
NO
YES
Does the opener door operate?
YES
Does the arm assembly F/L operate?
YES
Does the L/D motor operate?
NO
NO
Replace the opener lid.
Replace the gear rack F/L.
Check the assembly status of the
opener door.
Replace the arm assembly F/L.
YES
Does the holder assembly cassette move
same as the arm assembly F/L?
YES
Replace the front loading mechanism
assembly.
1-56 (No.YD068)
NO
Check power supply of the L/D motor.
NO
Check the assembly status of the
holder assembly cassette.
Page 57
5.3ELECTRICAL TROUBLESHOOTING GUIDE (DVD PART)
5.3.1 System operation flow
Power On
1. 8032 initializes SERVO, DSP & RISC registers
2. Write RISC code to SDRAM
3. Reset RISC
Show LOGO
Yes
Tray Close to Closed position
SLED Moves to Inner Position
1. Judge whether have disc and disc type
2. Jump to related disc reading procedure
Tray Closed?
No
SLED at Inner
Side?
No
Recieve
OPEN/ CLOSE
Key?
Yes
No
1. Execute Pressed Key & IR Key
2. Systemoperati on Routi ne Loop
1. Stop Playback & Open Tray
2. Display tray open message & LOGO
No
Receive
CLOSE Key?
Yes
(No.YD068)1-57
Page 58
5.3.2 SYSTEM Test flow
TEST
Check the AC Voltage
Power PCBA(110V or 220V)
YES
Switch on the Power PCBA
Is the DC Voltage
outputs OK?
(5V,1.8V,3.3V,8V,12V)
YES
Make sure the main PCBA don't
short on VCCs and switch it on.
NO
NO
Replace power PCBA or
AC transformer.
Repair or Replace Power PCBA
Is 3.3V and 1.8V DC
outputs normal on main
PCBA?
YES
Connect to PC CN601 Cable and
update the FLASH memory code.
Update FLASH
successfully?
YES
A
NO
NO
Check the regulators or related diodes.
1. Check 27MHz system clock.
2. Check system reset circuit.
3. Check FLASH R/W enable signal PRD,RWR.
4. Check CN601 SIGNALS.
5. Check FLASH Memory related circuit.
1-58 (No.YD068)
Page 59
A
RESET or Power On.
Show LOGO?
YES
NO
Flash Memory operates
properly?
YES
SDRAM works properly?
YES
ZR36868 VIDEO outputs
properly?
YES
Have TV signal output?
YES
Check AV cable connection
to TV set.
NO
NO
NO
NO
Check connection lines between FLASH
& ZR36868 and the FLASH access time
whether is suitable or not.
Check connection lines between SDRAM
& ZR36868 and the SDRAM is damaged.
Check the related circuit of ZR36868
Check the filtering and amp circuit of
TV signal.
Does Tray move
inside when it is not
at closed position?
YES
B
NONO
Normal TROUT &TRIN
signals?
YES
Normal TRCLOSE &
TROPEN signal?
YES
Normal LOAD+ & LOAD-
signal?
YES
Check the cable connection between
main PCBA and loader.
NO
NO
Check the load OPEN & CLOSE switch
Check the Tray control IO pins on
MT1389 & BA5954
Check the Tray control amplifying
circuit on Motor driver.
(No.YD068)1-59
Page 60
B
Does
the SLED move
to inner side when it is at
outter position?
NONO
Motor Driver STBY
Pin is High?
Check the connection line of
STBY signal.
YES
Do not put in disc and tray close.
YES
Is SLED_S
DC Level higher
than 1.4V?
YES
SLED+ and
outpup
SEDL-
properly?
YES
Check the cable connection with
MECHA.
NO
NO
Check the related circuit of
SLED_S.
Check the amp circuit on motor
driver.
Optical Lens has
movements for searching
Focus?
YES
C
NONO
Check cable connect on with
pick-up head.
Proper
FOCUS_S outputs
to motor driver?
YES
Proper FACT- & FACT+
outputs?
YES
NO
Check FFOCUS_S connection on
ZR36868 and motor dirver.
Check the amp circuit on motor
dirver.
1-60 (No.YD068)
Page 61
C
Laser turns on when
reading disc?
YES
Put disc in?Laser off
YES
Disc ID is correct?
YES
NONO
NO
NO
DVD_LD or CD_LD output
Collector voltage of
power transistor is OK?
Check cable connection between
transistor ouput and pick-up head.
Check DVD_LD & CD_LD signal
properly?
YES
YES
NO
Check the laser power circuit
on ZR36868 and connecting to
power transistor.
Check the related circuit on
laser power transistor
Does spindle rotate?
YES
D
NONO
Check the cable connection
between spindle and main PCBA.
Proper
SPINDLE_S signal on
ZR36868
YES
MOT_SPDL-
& MOT_SPDL+ output
properly?
YES
NO
Check SPINDLE_S related
circuit on ZR36868
Check the spindle control
amp circuit of motor driver.
(No.YD068)1-61
Page 62
D
YES
Focus ON OK?
YES
Track On OK?
YES
NO
NO
Proper signals on
A,B,C,D of ZR36868
YES
Check FOCUS_S signal
on ZR36868
Properly
TRACK_S signal
on ZR36868?
YES
TACT+ & TACToutput properly?
YES
Check cable connection on
pick-up head.
NO
NO
NO
Check connections between
ZR36868 and Pick-up head.
Check the TRACK_S
connection on ZR36868
and motor dirver.
Check the tracking control
amp circuit on motor
driver.
Disc is play ?
YES
E
NO
Check RF & VC signal waveform.
1-62 (No.YD068)
Page 63
E
Normal Audio output
when disc playba
Normal IR.VFD & Front
pannel key functions
TEST EN
ck?
YES
?
YES
D
NO
NO
Audio DAC received
correct data stream?
YES
Normal Audio DAC
out?
YES
Check Audio filter,amplify,mute
.
circuit
Communications between
IR.VFD Front pannel key & ZR36868
is normally
?
YES
Check the cable connection on
Front pannel
.
NO
NO
NO
Check connection between
ZR36868 & Audio
Check the related
circuit of Audio
Check communication lines on
ZR36868.
DAC.
DAC.
(No.YD068)1-63
Page 64
5.4DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
5.4.1 SYSTEM 27MHz CLOCK, RESET, FLASH R/W SIGNAL
1) ZR36868 main clock is at 27MHz(X501)
1.0V, 27MHz
2) ZR36868 reset is low active
FIG 1-1
5.3VA
PWR_CTL_H
M_RESET(FRONT)
1-64 (No.YD068)
FIG 1-2
Page 65
3) CN601 waveform during procedure(Downloading)
FIG 1-3
DUPTDO
DUPRDO
4) Flash R/W enable signal during download(Downloading)
FIG 1-4
FRD
FWR
(No.YD068)1-65
Page 66
5.4.2 SDRAM CLOCK
5.4.3 TRAY OPEN/CLOSE SIGNAL
DCLK = 135MHz, Vp-p=2.2, Vmax=2.7V
FIG 2-1
1) Tray open/close waveform
OPEN
CLOSE
FIG 3-1
1-66 (No.YD068)
Page 67
5.4.4 SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)
FIG 4-1
5.4.5 LENS CONTROL RELATED SIGNAL(NO DISC CONDITION)
SLED_S(2.0V/1.4V/1.0V)
SLED+(4.7V/4.0V/2.6V)
SLED-(5.3V/4.0V/3.0V)
FIG 5-1
FOCUS_S(1.5V/1.4V/1.3V)
FACT+(4.0V/3.6V/3.2V)
FACT-(4.0V/3.6V/3.2V)
(No.YD068)1-67
Page 68
5.4.6 LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION)
FIG 6-1
MD_CD(0V/180mV)
MD_LD(5.0V//3.5V)
DVD_LD(5.0V/3.6V)
5.4.7 DISC TYPE JUDGEMENT WAVEFORM
F+
FE
RFL
FIG 7-1 (DVD)
1-68 (No.YD068)
Page 69
FIG 7-2 (DVD)
F+
FE
RFL
F+
FIG 7-3 (CD)
FE
RFL
(No.YD068)1-69
Page 70
5.4.8 FOCUS ON WAVEFORM
F+
FE
RFL
FIG 7-4 (CD)
FIG 8-1 (DVD)
FOCUS_S
FACT+
FACT-
1-70 (No.YD068)
Page 71
FIG 8-2 (CD)
5.4.9 SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)
FOCUS_S
FACT+
FACT-
SPINDLE_S
FIG 9-1
MOT_SPDL-(3.6V/2.4V)
MOT_SPDL+(3.6V/4.8V)
(No.YD068)1-71
Page 72
5.4.10 TRACKING CONTROL RELATED SIGNAL(System checking)
FIG 10-1(DVD)
TRACK_S
TACT-
TACT+
FIG 10-2(CD)
TRACK_S
TACT-
TACT+
1-72 (No.YD068)
Page 73
5.4.11 ZR36868 AUDIO OPTICAL AND COAXIAL OUTPUT(SPDIF)
FIG 11-1
5.4.12 ZR36868 VIDEO OUTPUT WAVEFORM
1) 100%
FIG 12-1
(No.YD068)1-73
Page 74
2) COMPOSITE VIDEO SIGNAL
FIG 12-2
5.4.13 ZR36868 AUDIO OUTPUT TO AUDIO DAC
FIG 13-1
1-74 (No.YD068)
Page 75
5.4.14 AUDIO OUTPUT FROM AUDIO DAC
FIG 14-1
(No.YD068)1-75
Page 76
Victor Company of Japan, Limited
AV & MULTIMEDIA COMPANY DIGITAL VIDEO STORAGE CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan
(No.YD068)
Printed in Japan
VPT
Page 77
PARTS LIST
[HR-XV28SEF,HR-XV28SEK,HR-XV28SER,
HR-XV28SEU,HR-XV28SEY,HR-XV28SEZ]
* SAFETY PRECAUTION
Parts identified by the symbol are critical for safety. Replace only with
specified part numbers.
* BEWARE OF BOGUS PARTS
Parts that do not meet specifications may cause trouble in regard to safety
and performance. We recommend that genuine JVC parts be used.
* (x_) in a description column shows the number of the used part.
- Contents -
Exploded view of general assembly and parts list ..................... 3-2
VHS mechanism assembly and parts list................................... 3-4
DVD mechanism assembly and parts list................................... 3-7
Electrical parts list ...................................................................... 3-9
Packing materials and accessories parts list ........................... 3-22
(No.YD068)3-1
Page 78
Exploded view of general assembly and parts list
25
0
463
463
Block No. M1MM
463
285
A43
DVD unit
286
283
463
Key board
assembly <02>
284
457
Deck/mecha
assembly
469
2
61
470
471
Power board
assembly <01>
324
VCR
main
28
8
323
265
274
465
463
board
assembly
<03>
469
3-2(No.YD068)
261
452
A44
261
330
300
261
Page 79
MODEL
HR-XV28SEF
HR-XV28SEKAB
MARK
MODEL
HR-XV28SER
HR-XV28SEUCD
MARK
MODEL
HR-XV28SEY
HR-XV28SEZEF
General assembly
Block No. [M][1][M][M]
Symbol No.Part No.Part NameDescriptionLocal
250LG-3110R-V024BCASEVBW8024 PRESS TOP A288G B:3/S:
261LG-5040R-0069SRUBBERCCD 05 NEW SILICON OTHER 2T (3(x4)
265LG-4930R-0384AHOLDERPOWER CORD
274LG-3300R-V075APLATEONE BOARD SLIM PRESS A/V JACK
283LG-3580R-V145ADOORVCR VJ90 MOLD CST JVC COMBI
284LG-442-681ASPRINGDOOR
285LG-3580R-T192ADOORVCR VJ90 MOLD TRAY JVC COMBI
286LG-4970R-0146ASPRINGPLATE DR4000 SPRING
288LG-4930R-0573AHOLDERVCR V9500 MOLD POWER PWB