Panasonic DMR-EH68EC / DMR-EH68EP / DMR-EH685EG Service Manual ▷ View online
Model No.
DMR-EH68EC
DMR-EH68EP
DMR-EH685EG
Vol. 1
Colour
(S).......................Silver Type
(K).......................Black Type
DVD Recorder
ORDER NO.DSD0803011CE
1
Safety Precaution
4
1.1.
General guidelines
4
2
Warning
5
2.1.
Prevention of Electrostatic Discharge (ESD) to
Electrostatic Sensitive (ES) Devices
5
2.2.
Precaution of Laser Diode
6
2.3.
Service caution based on legal restrictions
7
3
Service Navigation
8
3.1.
Service Information
8
3.2.
Caution for DivX
8
4
Specifications
9
5
Location of Controls and Components
11
6
Operation Instructions
13
6.1.
Taking out the Disc from DVD-Drive Unit when the Disc
cannot be ejected by OPEN/CLOSE button
13
7
Service Mode
17
7.1.
Self-Diagnosis and Special Mode Setting
17
8
Service Fixture & Tools
29
9
Disassembly and Assembly Instructions
30
9.1.
Disassembly Flow Chart
30
9.2.
P.C.B. Positions
31
9.3.
Top case
32
9.4.
Front Panel
32
9.5.
Front (L) P.C.B., Front (R) P.C.B.
33
9.6.
HDD, ATAPI P.C.B.
33
9.7.
RAM/Digital P.C.B. Module
35
9.8.
DV Jack P.C.B., USB SD P.C.B.
36
9.9.
Rear Panel
37
9.10. Power P.C.B.
37
9.11. HDMI P.C.B.
38
9.12. Main P.C.B., SW P.C.B.
38
10 Measurements and Adjustments
39
10.1. Service Positions
39
10.2. Caution for Replacing Parts
43
10.3. Standard Inspection Specifications after Making Repairs 45
11 Block Diagram
47
11.1. Power Supply Block Diagram
47
11.2. Analog Video Block Diagram
49
11.3. Analog Audio Block Diagram
50
11.4. Analog Timer Block Diagram
51
11.5. HDMI Block Diagram
52
12 Schematic Diagram
53
12.1. Interconnection Schematic Diagram
53
12.2. Power Supply Schematic Diagram
54
12.3. Main Net (1/4) Section (Main P.C.B. (1/4)) Schematic
Diagram (M)
55
12.4. Main Net (2/4) Section (Main P.C.B. (1/4)) Schematic
Diagram (M)
56
12.5. Main Net (3/4) Section (Main P.C.B. (1/4)) Schematic
Diagram (M)
57
12.6. Main Net (4/4) Section (Main P.C.B. (1/4)) Schematic
Diagram (M)
58
12.7. AV I/O (1/4) Section (Main P.C.B. (2/4)) Schematic
Diagram (AV)
60
CONTENTS
Page
Page
2
DMR-EH68EC / DMR-EH68EP / DMR-EH685EG
12.8. AV I/O (2/4) Section (Main P.C.B. (2/4)) Schematic
Diagram (AV)
61
12.9. AV I/O (3/4) Section (Main P.C.B. (2/4)) Schematic
Diagram (AV)
62
12.10. AV I/O (4/4) Section (Main P.C.B. (2/4)) Schematic
Diagram (AV)
63
12.11. Tuner Section (Main P.C.B. (3/4)) Schematic Diagram
(TU)
65
12.12. Timer (1/4) Section (Main P.C.B. (4/4)) Schematic
Diagram (T)
67
12.13. Timer (2/4) Section (Main P.C.B. (4/4)) Schematic
Diagram (T)
68
12.14. Timer (3/4) Section (Main P.C.B. (4/4)) Schematic
Diagram (T)
69
12.15. Timer (4/4) Section (Main P.C.B. (4/4)) Schematic
Diagram (T)
70
12.16. HDMI Schematic Diagram
71
12.17. USB SD Schematic Diagram
72
12.18. DV Jack Schematic Diagram
73
12.19. SW Schematic Diagram
73
12.20. Front (L) Schematic Diagram
73
12.21. Front (R) Schematic Diagram
73
12.22. ATAPI Schematic Diagram
74
13 Printed Circuit Board
75
13.1. Power P.C.B.
75
13.2. Main P.C.B.
76
13.3. HDMI P.C.B.
81
13.4. USB SD P.C.B.
82
13.5. Front (L) P.C.B., Front (R) P.C.B., SW P.C.B. and DV
Jack P.C.B.
83
13.6. ATAPI P.C.B.
84
14 Appendix for Schematic Diagram
85
14.1. Voltage and Waveform Chart
85
15 Parts and Exploded Views
93
15.1. Exploded Views
93
15.2. Replacement Parts List
95
16 Schematic Diagram for printing with A4
103
3
DMR-EH68EC / DMR-EH68EP / DMR-EH685EG
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
1M
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
1M
Ω
and 5.2M
Ω
.
When the exposed metal does not have a return path to the
chassis, the reading must be
chassis, the reading must be
.
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 1.5k
Ω
, 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.
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.
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.
Figure 1
1 Safety Precaution
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.
4
DMR-EH68EC / DMR-EH68EP / DMR-EH685EG