Panasonic DMR-EH50EB User manual

©2005 Matsushita Electric Industrial CO., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
DMR-EH50EB
DMR-EH50EG
DMR-EH50EP
DMR-EH52EG
Vol.1
Colour
(K).......................Black Type
(S).......................Silver Type
DVD Video Recorder
ORDER NO.DSD0503040C2

2
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

3
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

1 Safety precautions 5
1.1. General guidelines 5
2 Prevention of Electrostatic Discharge (ESD) to Electrostatic
Sensitive (ES) Devices 6
3 Precaution of Laser Diode 7
4 Handling the Lead-free Solder 7
4.1. About lead free solder (PbF) 7
5 Each Button 8
6 New Feature 10
6.1. Quick start function(REC) 10
7 Taking out the Disc from RAM-Drive Unit when the Disc
cannot be ejected by OPEN/CLOSE button 11
7.1. Forcible Disc Eject 11
7.2. When the Forcible Disc Eject can not be done. 11
8 Service Explorer 12
9 Self-Diagnosis and Special Mode Setting 15
9.1. Self-Diagnosis Functions 15
9.2. Special Modes Setting 16
9.3. Service Modes 19
10 Assembling and Disassembling 24
10.1. Disassembly Flow Chart 24
10.2. P.C.B. Positions 24
10.3. Top Case 25
10.4. Front Panel 25
10.5. SD Card P.C.B. 25
10.6. Digital P.C.B. 25
10.7. DVD-RAM Drive 26
10.8. HDD 26
10.9. LED P.C.B. 27
10.10. Power P.C.B. 28
10.11. Rear Panel 28
10.12. Front (L) P.C.B. 29
10.13. Main P.C.B. 29
10.14. Tuner P.C.B. and Nicam Decoder P.C.B. 30
11 Service Fixture and Tools 31
12 Service Positions 31
12.1. Checking and Repairing of Power P.C.B. 31
12.2. Checking and Repairing of Digital P.C.B. 32
12.3. Checking and Repairing of Main P.C.B. 33
12.4. Checking and Repairing of DVD-RAM Drive 34
12.5. Checking and Repairing of HDD 35
13 Caution after replacing parts 36
13.1. After replacing the RAM Drive with new one 36
13.2. When the unit does not operate normally after replacing
the Timer Microprocessor or Main P.C.B. 36
14 Standard Inspection Specifications after Making Repairs 36
15 Voltage and Waveform Chart 37
15.1. Power P.C.B. 37
15.2. Main P.C.B. 37
15.3. Tuner P.C.B. 39
15.4. LED P.C.B. 39
15.5. P9001 Connector 40
15.6. Waveform Chart 41
16 Abbreviations 42
17 Block Diagram 45
17.1. Power Supply Block Diagram 45
17.2. Analog Video Block Diagram 47
17.3. Analog Audio Block Diagram 48
17.4. Timer Block Diagram 49
18 Schematic Diagram 51
18.1. Interconnection Schematic Diagram 51
18.2. Power Supply Schematic Diagram 52
18.3. Main Net Section (Main P.C.B. (1/3)) Schematic Diagram
(M) 54
18.4. A/V I/O Section (Main P.C.B. (2/3)) Schematic Diagram
(AI) 56
18.5. Timer Section (Main P.C.B. (3/3)) Schematic Diagram (T)
58
18.6. Tuner Pack Schematic Diagram 60
18.7. Nicam Decoder Schematic Diagram 61
18.8. SD Card Schematic Diagram 62
18.9. LED Schematic Diagram 63
19 Print Circuit Board 65
19.1. Power P.C.B. 65
19.2. Main P.C.B. 66
19.3. Tuner P.C.B., LED P.C.B., Front (L) P.C.B. 71
19.4. Nicam Decoder P.C.B. 72
19.5. SD Card P.C.B. 73
20 Exploded Views 75
20.1. Casing Parts & Mechanism Section 75
20.2. Packing & Accessories Section 76
21 Replacement Parts List 77
CONTENTS
Page Page
4
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

1.1.1. Leakage current cold check
1. Unplug the AC cord and connect a jumper between the two
prongs on the plug.
2. Measure the resistance value, with an ohmmeter, between
the jumpered AC plug and each exposed metallic cabinet
part on the equipment such as screwheads, connectors,
control shafts, etc. When the exposed metallic part has a
return path to the chassis, the reading should be between
1MΩand 5.2MΩ.
When the exposed metal does not have a return path to
the chassis, the reading must be .
Figure 1
1.1.2. Leakage current hot check
(See Figure 1 .)
1. Plug the AC cord directly into the AC outlet. Do not use an
isolation transformer for this check.
2. Connect a 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF
capacitors, between each exposed metallic part on the set
and a good earth ground such as a water pipe, as shown in
Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt or more
sensitivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the
voltage at each point.
5. Reverse the AC plug in the AC outlet and repeat each of the
above measurements.
6. The potential at any point should not exceed 0.75 volts
RMS. A leakage current tester (Simpson Model 229 or
equivalent) may be used to make the hot checks, leakage
current must not exceed 1/2 milliampere. In case a
measurement is outside of the limits specified, there is a
possibility of a shock hazard, and the equipment should be
repaired and rechecked before it is returned to the
customer.
1 Safety precautions
1.1. General guidelines
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
5
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

2 Prevention of Electrostatic Discharge (ESD) to
Electrostatic Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called
Electrostatic Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistor-sand
semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage
caused by electrostatic discharge (ESD).
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your
body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static (ESD protected)" can
generate electrical charge sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable
conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be installed.
Caution
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise hamless motion such as the brushing
together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage
an ES device).
6
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

3 Precaution of Laser Diode
4 Handling the Lead-free Solder
4.1. About lead free solder (PbF)
Distinction of PbF P.C.B.:
P.C.B.s (manufactured) using lead free solder will have a PbF stamp on the P.C.B.
Caution:
·Pb free solder has a higher melting point than standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher.
Please use a high temperature soldering iron. In case of the soldering iron with temperature control, please set it to 700 ±
20°F (370 ± 10°C).
·Pb free solder will tend to splash when heated too high (about 1100°F/600°C).
·When soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat
the soldering points with the Pb free solder until it melts enough.
7
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

5 Each Button
8
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

9
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

6 New Feature
6.1. Quick start function(REC)
1. General
A few seconds after tuning on the unit,you can start recording to DVD-RAM,HDD.
You can switch the operation of this function (ON/OFF) on the menu screen. .
2. Quick start(REC) principle
In the power-off at Quick start, only power supplies for video IC,tuner and storage media are cut off.
When the REC button is pushed a few second after the power button is pushed, Audio and Video data are stored in
DDR SDRAM before a storage media(DVD-RAM or HDD) preparation.
*Preparation time →DVD-RAM: Fabout 8seconds
HDD: about 18seconds
After a storage media(DVD-RAM or HDD) preparation,Audio and Video data are transfer from DDR SDRAM to the
storage media.
10
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

7 Taking out the Disc from RAM-Drive Unit when the Disc
cannot be ejected by OPEN/CLOSE button
7.1. Forcible Disc Eject
7.1.1. When the power can be turned off.
1. Turn off the power and press [STOP] [CH UP] keys on the front panel simultaneously for 5 seconds.
7.1.2. When the power can not be turned off.
1. Press [POWER] key on the front panel for over 10 seconds to turn off the power forcibly, and press [STOP] [CH UP] keys on
the front panel simultaneously for 5 seconds.
7.2. When the Forcible Disc Eject can not be done.
1. Turn off the power and pull out AC cord.
2. Remove the Top Case.
3. Remove the Front Panel.
4. Remove 4 screws and Upper Base Unit from DVD-RAM Drive.
5. Take out the disc and put the Opener Roller on fully position for direction of Arrow.
6. Put the Upper Base Unit so that the Opener Roller is inserted into the groove.
7. Check Opener Roller is seen through the Opener position Checking Hole, and tighten 4 screws.
11
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

8 Service Explorer
Confirm “RAM-Drive Last Error” in Service Mode
Execute Service Mode
1. Press [REC], [CH UP] and [OPEN/CLOSE] simultaneously for 5 seconds when P-off.
FL Display:
*After finishing display “(7). Factor of Drive Error occurring”, press [0] [2] ~[1] [9] keys of the Remote Controller so that
19 memories can be displayed as maximum.
2. Press [4] [2] keys of remote controller.
Example of FL Display:
(1) Error Number is displayed for 5 seconds.
(2) Time when the error has occurred is displayed for 5 seconds.
(3) Last Drive Error (1/2) is displayed for 5 seconds.
(4) Last Drive Error (2/2) is displayed for 5 seconds.
12
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

(5) Error occurring Disc type is displayed for 5 seconds.
(6) Disc Maker´s ID is displayed for 5 seconds.
Example of Disc Maker´s ID:
DVD-R Disc
No. FL Display (Disc Maker´s ID) Disc Maker Country
1 MEI Panasonic Japan
2 PVC Pioneer Japan
3 MCC Mitsubishi Chemical Corporation Japan
4 TDK TDK Japan
5 MXL Maxell Japan
6 MCI MITUI CHEMICALS Japan
7 JVC Victor JVC Japan
8TAIYOYUDEN Taiyo yuden Japan
TYG
9 GSC Giga Storage Taiwan
10 PRODISC Prodisc Taiwan
11 PRINCO PRINCO Taiwan
12 RITEK RITEK Taiwan
13 OPTDISC OPTDISC Taiwan
14 LEAD DATA LEAD DATA Taiwan
15 CMC CMC Taiwan
16 AUVISTAR AUVISTAR Taiwan
17 ACER Acer Taiwan
18 VIVASTAR VIVASTAR Switzerland
19 LGE LG Electronics Korea
DVD-RAM Disc
No. FL Display (Disc Maker´s ID) Disc Maker Country
1 MEI Panasonic
2 MATSUSHITA Panasonic Japan
3 MXL Maxell Japan
4 PRODISC Prodisc Taiwan
5 OPTDISC OPTDISC Taiwan
6 CMC CMC Taiwan
*Since an display is arbitrarily set up by the disk producer side, the above-mentioned display may be changed.
Please make it reference as an example of a display.
(7) Factor of Drive Error occurring is left displayed
Error Occurring Disc Type
FL Display Disc Type
00 DVD-ROM/Video
01 Audio-CD
02 2.6GB DVD-RAM
03 4.7GB DVD-RAM
04 DVD-R
13
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

Error Occurring Disc State
14
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

9 Self-Diagnosis and Special Mode Setting
9.1. Self-Diagnosis Functions
Self-Diagnosis Function provides information for errors to service personnel by “Self-Diagnosis Display” when any error has
occurred.
U**, H** and F** are stored in memory and held.
You can check latest error code by transmitting [0] [1] of Remote Controller in Service Mode.
Automatic Display on FL will be cancelled when the power is turned off or AC input is turned off during self-diagnosis display is ON.
Error Code Diagnosis contents Description Monitor Display Automatic FL display
U30 Remote control code error Display appears when main unit and remote
controller codes are not matched.
No display
“*” is remote controller code of the
main unit.
Display for 5 seconds.
U59 Abnormal inner temperature
detected
Display appears when the drive temperature
exceeds 70°C.
The power is turned off forcibly.
For 30 minutes after this, all key entries are
disabled. (Fan motor operates at the highest
speed for the first 5 minutes. For the
remaining 25 minutes, fan motor is also
stopped.) The event is saved in memory as
well.
No display
“U59 is displayed for 30 minutes.
U99 Hang-up Displayed when communication error has
occurred between Main microprocessor and
Timer microprocessor.
No display
Displayed is left until the
[POWER] key is pressed.
H19 Inoperative fan motor When inoperative fan motor is detected after
powered on, the power is turned off
automatically.
The event is saved in memory.
No display No display
F00 No error information Initial setting for error code in memory
(Error code Initialization is possible with error
code initialization and main unit initialization.)
No display No display
F58 Drive hardware error When drive unit error is detected, the event is
saved in memory.
No display No display
F34 Initialization error when main
microprocessor is started up
for program recording
When initialization error is detected after
starting up main microprocessor for program
recording, the power is turned off
automatically.
The event is saved in memory.
No display No display
UNSUPPO
RT
Unsupported disc error *An unsupported format disc was played,
although the drive starts normally.
*The data format is not supported, although
the media type is supported.
*Exceptionally in case of the disc is dirty.
“This disc is
incompatible.”
Display for 5 seconds.
NO READ Disc read error *A disc is flawed or dirty.
*A poor quality failed to start.
*The track information could not be read.
“Cannot read.
Please check the
disc.”
Display for 5 seconds.
HARD
ERR
Drive error The drive detected a hard error. “DVD drive error.”
Display for 5 seconds.
SELF
CHECK
Restoration operation Since the power cord fell out during a power
failure or operation, it is under restoration
operation.
*It will OK, if a display disappears
automatically. If a display does not disappear,
there is the possibility that defective Digital
P.C.B. / RAM drive.
No display
Full
Program
32 programs are already set. 32 programs are already set. No display
15
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

Error Code Diagnosis contents Description Monitor Display Automatic FL display
UNFORM
AT
Unformatted disc error You have inserted an unformatted DVD-RAM
or DVD-RW that is unformatted or recorded
on other equipment.
PLEASE
WAIT
Unit is in termination process Unit is in termination process now.
“BYE” is displayed and power will be turned
off.
In case “Quick Start” of setup menu is ON, it
is displayed in restoration operation for AC
off.
No display
9.2. Special Modes Setting
Item FL display Key operation
Mode name Description Front Key
TEST Mode *All the main unit´s parameters (include tuner)
are initialized.
Press [STOP], [CH UP] and
[OPEN/CLOSE] keys
simultaneously for 5 seconds when
power is off.
Rating password The audiovisual level setting password is
initialized to “Level 8”.
Open the tray, and press [REC] and
[PLAY] simultaneously for 5
seconds.
NOTE:
Drive should be selected to DVD.
Service Mode Setting every kind of modes for servicing.
*Details are described in “9.3. Service
Mode”.
When the power is off, press [CH
UP], [OPEN/CLOSE] and [REC]
keys simultaneously for 5 seconds.
Forced disc eject Removing a disc that cannot be ejected.
The tray will open and unit will shift to P-off
mode.
*When Timer REC is ON or EXT-LINK is ON,
execute " Forced disc eject " after releasing
Timer REC or EXT-LINK.
*This command is not effective during "Child
lock" is ON.
While Demonstration Lock is being set, this
Forced disc eject function is not accepted.
The display before execution
leaves.
When the power is off, press
[STOP] and [CH UP] keys
simultaneously for 5 seconds.
Child lock/unlock Set or release “Child Lock”. Press [ENTER] and [RETURN] by
remote controller simultaneously
until [X-HOLD] is displayed.
NTSC/PAL system select To switch PAL/NTSC alternately. The display before execution
leaves.
While the power is on (E-E mode),
press [STOP] and [OPEN/CLOSE]
simultaneously for 5 seconds.
Forced power-off When the power button is not effective while
power is ON, turn off the power forcibly.
*When Timer REC is ON or EXT-LINK is ON,
execute “Forced Power-off” after releasing
Timer REC or EXT-LINK.
Display in P-off mode. Press [Power] key over than 10
seconds.
16
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

Item FL display Key operation
Mode name Description Front Key
Aging Perform sequence of modes as * Aging
Description shown below continually.
Display following the then mode. When the power is ON, press
[STOP], [POWER] and
[OPEN/CLOSE] simultaneously for
over 5 seconds and less than 10
seconds.
NOTE1:
If Unit has not turned into Aging
mode by operations shown above,
execute TEST MODE once and re-
execute operation shown above.
(*All the main unit’s parameters
include tuner are initialized by TEST
mode.)
NOTE2:
If the unit has hung-up because of
pressing keys for over 10 seconds,
once turn off the power, and re-
execute this command.
*When releasing Aging mode, press
[POWER] key.
Aging Contents (Example):
Demonstration
lock/unlock
Ejection of the disc is prohibited.
The lock setting is effective until unlocking the
tray and not released by “Main unit
initialization” of service mode.
*When lock the tray.
“LOCK” is displayed for 3 seconds.
When the power is on, press
[STOP] and [POWER] keys
simultaneously for 5 seconds.
*When unlock the tray.
“UNLOCK” is displayed for 3
seconds.
When the power is on, press
[STOP] and [POWER] keys
simultaneously for 5 seconds.
*When press OPEN/CLOSE key
while the tray being locked.
Display “LOCK” for 3 seconds.
Press [OPEN/CLOSE] key while the
tray being locked.
ATP re-execution Re-execute ATP. Display at ATP executing. When the power is on (E-E mode),
press [CH UP] and [CH DOWN]
simultaneously for 5 seconds.
17
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

Item FL display Key operation
Mode name Description Front Key
Progressive initialization The progressive setting is initialized to
Interlace.
The display before execution
leaves.
When the power is on (E-E mode),
press [STOP] and [PLAY]
simultaneously for 5 seconds.
18
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

9.3. Service Modes
Service mode setting: While the power is off, press REC, CH UP and OPEN / CLOSE simultaneously for five seconds.
Item FL display Key operation
Mode name Description (Remote controller key)
Release Items Item of Service Mode executing is cancelled. Press [0] [0] or [Return] in service
mode.
Error Code Display Last Error Code of U/H/F held by Timer is
displayed on FL.
*Details are described in “9.1. Self-
Diagnosis Functions”.
Press [0] [1] in service mode
ROM Version Display Region code, MAIN firm version, TIMER firm
version and DRIVE firmware versions are
displayed on FL for five seconds per each
version in order, but ROM version will be left
displayed.
‘’*’’ are version displays.
Press [0] [2] in service mode
White Picture Output White picture is output as component Output
from AV Decoder.
*White picture
(Saturation rate : 100%)
*It is enable to switch Interlace/Progressive by
“I/P switch: [1] [4]”
*Initial mode is “Interlace”. Press [1] [1] in service mode.
Switch Interlace/Progressive Press [1] [4] in White Picture Output
mode.
*I/P are switched alternately.
Magenta Picture Output Magenta picture is output with Component
Output from AV Decoder.
*Magenta picture
(Saturation rate: 100%)
*It is enable to switch Interlace/Progressive by
“I/P switch: [1] [4]”
*Initial mode is “Interlace”. Press [1] [2] in service mode.
Switch Interlace/Progressive Press [1] [4] in Magenta Picture
Output mode.
*I/P are switched alternately.
RTSC Return in XP
(A & V)
AV1 input signal is encoded (XP), decoded
(XP) and output decoded signal to external
without DISC recording and DISC playback.
Initial mode: EE2/ Interlace/ XP/
Audio 48kHz
Press [1] [3] in service mode.
Switch Interlace/Progressive Press [1] [4] in RTSC Return XP
mode.
*I/P are switched alternately.
Audio 44.1 kHz/ 48 kHz Switch Press [2] [4] in RTSC Return XP
mode.
*48 kHz / 44.1 kHz are switched
alternately.
I/P Switch Switch Interlace and Progressive in EE mode.
*Initial setting is “Interlace”.
*This command is effective during executing
“White Picture Output”, “Magenta Picture
Output” and “RTSC Return in XP (A & V)”
modes.
Initial mode is Interlace
Switch Interlace/Progressive
Press [1] [4] in I/P Switch mode.
*I/P are switched alternately.
19
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG

Item FL display Key operation
Mode name Description (Remote controller key)
Audio Mute (XTMUTE) Check whether mute is applied normally by
the timer microprocessor.
Press [2] [1] in service mode.
Audio Mute (XDMUTE) Check whether mute is applied normally by
the Digital P.C.B..
Press [2] [2] in service mode.
Audio Pattern Output The audio pattern stored in the internal
memory is output
(Lch: 1kHz/-18dB)
(Rch: 400Hz/-18dB)
*Audio sound clock switching operation of
DAC can be confirmed by sub command [2]
[4].
Initial mode (Audio 48kHz) Press [2] [3] in service mode.
Audio 44.1kHz/48kHz switching Press [2] [4] in Audio Pattern Output
mode.
*48 kHz / 44.1 kHz are switched
alternately.
HDD READ inspection Perform a complete read inspection of the
HDD.
When the HDD is OK
If the HDD is defective
Press [3] [1] in the service mode.
*When canceling the checking
mode while executing, do “forced
power-off”.
Method:
Press the “POWER” button more
than 10 seconds.
Laser Used Time
Indiction
Check laser used time (hours) of drive.
l(*****) is the used time display in
hour.
lLaser used time of DVD/ CD in
Playback/Recording mode is
counted.
Press [4] [1] in service mode.
Delete the Laser Used
Time
Laser used time stored in the memory of the
unit is deleted.
Press [9] [5] in service mode.
20
DMR-EH50EB / DMR-EH50EG / DMR-EH50EP / DMR-EH52EG