Panasonic DMR-EH68EC / DMR-EH68EP / DMR-EH685EG Service Manual ▷ View online
10.3. Standard Inspection Specifications after Making Repairs
After making repairs, we recommend performing the following inspection, to check normal operation.
No.
Procedure
Item to Check
1
Turn on the power, and confirm items pointed out.
Items pointed out should reappear.
2
Insert RAM disc.
The Panasonic RAM disc should be recognized.
3
Enter the EE (TU IN / AV IN - AV OUT) mode.
No abnormality should be seen in the picture, sound or operation.
4
Perform auto recording and playback for one minute using the RAM
disc.
disc.
No abnormality should be seen in the picture, sound or operation.
*Panasonic DVD-RAM disc should be used when recording and
playback.
*Panasonic DVD-RAM disc should be used when recording and
playback.
5
Model with the HDD: Perform auto recording and playback for one
minute using the HDD.
minute using the HDD.
No abnormality should be seen in the picture, sound or operation.
6
If a problem is caused by a VCD, DVD-R, DVD-Video, Audio-CD, or
MP3, playback the test disc.
MP3, playback the test disc.
No abnormality should be seen in the picture, sound or operation.
7
Models with USB Input Jack or DV Input Jack: In case of that the
trouble is caused by USB terminal and/or DV terminal.
trouble is caused by USB terminal and/or DV terminal.
Models with USB Input Jack or DV Input Jack;
1) USB terminal: Check to be able to display and copy the picture.
2) DV terminal: Check to be able to record from DVC.
1) USB terminal: Check to be able to display and copy the picture.
2) DV terminal: Check to be able to record from DVC.
8
After checking and making repairs, upgrade the firmware to the
latest version.
latest version.
Make sure that [FIRM_SUCCESS] appears in the FL displays.
*[UNSUPPORT] display means the unit is already updated to
newest same version. Then version up is not necessary.
*[UNSUPPORT] display means the unit is already updated to
newest same version. Then version up is not necessary.
9
Transfer [9][9] in the service mode setting, and initialize the service
settings (return various settings and error information to their
default values. The laser time is not included in this initialization).
settings (return various settings and error information to their
default values. The laser time is not included in this initialization).
Make sure that [CLR] appears in the FL display.
After checking it, turn the power off.
After checking it, turn the power off.
Use the following checklist to establish the judgement criteria for the picture and sound.
Item
Contents
Check
Item
Contents
Check
Picture
Block noise
Sound
Distorted sound
Crosscut noise
Noise (static, background noise, etc.)
Dot noise
The sound level is too low.
Picture disruption
The sound level is too high.
Not bright enough
The sound level changes.
Too bright
Flickering color
Color fading
Flickering color
Color fading
45
DMR-EH68EC / DMR-EH68EP / DMR-EH685EG
46
DMR-EH68EC / DMR-EH68EP / DMR-EH685EG
11 Block Diagram
11.1. Power Supply Block Diagram
H
H
H
H
TIMER +5V
UNREG +38V
8
IC7503-
D7506
TO
U/V
TUNER
U/V
TUNER
A
B
C
D
F
E
X SW+3.3V
X SW+3.8V
IC7501- 16
(X SW+3.3V OUT)
Q1502
DI P ON
IC7501- 44
IC7501- 44
SECTION
TIMER
FROM
14,15
P1501
P1102
X SW+3.8V
1,2,3
P1501
P1102
X SW+5.8V
9,10,11,12
P1501
P1102
X SW+12V
TRANSFORMER
POWER SWITCHING
DISPLAY HEATER
T7501
7
1
IP1501
2
1
IP7501
2
1
PS+11.6V
8
8
46
IC3001- ,IC4009- ,IC4012-
PWR SAVE :ON
IC7501- 79
IC7501- 79
SECTION
TIMER
FROM
( :ON)
QR7401
(REG.PS+11.6V)
IC7401
VOUT
VIN
3
5
:ON
2
2
1
GND
H
H
DR+12V
DR P ON
IC7501- 42
IC7501- 42
SECTION
TIMER
FROM
( :ON)
QR1501
FET
D
S
G
Q1509
(DR+12V OUT)
(DR+12V OUT)
1
2
3
5
6
7
8
4
AC INLET
P1101
P1101
SURGE
SUPPRESSOR
AND
SURGE
ABSORBER
SUPPRESSOR
AND
SURGE
ABSORBER
F1101
VA1110,L1120,L1121
D1140,C1143
RECTIFIER
T1150
POWER
SWITCHING
TRANSFORMER
POWER
SWITCHING
TRANSFORMER
6
P1
2
1
3
4
9
5
IC1150
(SWITCHING IC)
VCC
GND
Z/C
F/B
4
2
1
P2
B1
B2
7
VIN
G
G
NS12
NS12
8
11
1
3
2
D1270
1
2
7
6
Vin
V5
FET
Gate
Drive
Gate
Drive
GND
IC1601
(DC/DC CONVERTER)
FET
D
S
G
2
4
5
6
7
1
3
8
Q1600
(REG.X SW+5.8V)
(REG.X SW+5.8V)
4
3
2
1
Q1200
(FEED BACK)
(FEED BACK)
1
2
3
IC1200
(ERROR VOLTAGE DET.)
COLD
HOT
POWER P.C.B.
MAIN P.C.B.
DMR-EH68EC/EP,EH685EG
Power Supply Block Diagram (1/2)
8
Current
Sense
Sense
12
7
DMR-EH68EC / DMR-EH68EP / DMR-EH685EG
47
FET
D
S
G
Q1501
(DR+5V OUT)
(DR+5V OUT)
4
1
2
5
6
3
H
H
H
L
L
X SW+5.8V
TU REG.+5V
PS+5V
GND
BOOSTER+5V
AU+5V
TU P ON
IC7501- 43
IC7501- 43
L
HDD PFAIL
IC7501- 40
IC7501- 40
SECTION
TIMER
FROM
(REG.AU+5V)
IC4001
VOUT
VIN
5
2
:ON
H :ON
3
4
GND
DR+5V
X SW+3.8V
(REG.DR+5V)
IC1506
VOUT
VIN
4
3
1
2
GND
CONT
(REG.+3.3V)
IC7303
VOUT
VIN
5
2
3
1
GND
H :ON
(REG.+1.5V)
IC7304
VOUT
VIN
5
2
3
4
GND
(REG.+5V)
IC1510
VOUT
VIN
5
2
:ON
3
4
GND
(VOLT. DET.)
IC1501
VOUT
VCC
4
2
3
5
GND GND
94
84
42
IC3001- / /
TO
U/V
TUNER
U/V
TUNER
(REG.BOOSTER+5V)
IC7402
VOUT
CONT
5
2
3
GND
1 VIN
IC7501- 12
IC7701- 3 ,IC7504- ,
13
43
90
99
62
IC7501- / /
5
6
10
1
IC7301- / /
/
13
/
20
/
21
/
28
/
35
/
30
23
IC7301- /
73
IC7501-
2
IC4901-
RESET
P FAIL
X SW+5V
X SW+5V
7
(REG.X SW+5V/RESET)
IC7503
RESET
5V DETOUT
XSW5VOUT
VOUT
VIN
1
GND
40
25
8
6
IC3001- / / /
(REG.PS+5V)
IC7403
VOUT
VIN
5
3
2
1
CONT
HDMI P.C.B.
MAIN P.C.B.
DR+12V
A
B
C
D
F
E
DMR-EH68EC/EP,EH685EG
Power Supply Block Diagram (2/2)
Power Supply Block Diagram (2/2)
IC7302
1
4
VIN
OUT
(RESET)
34
IC7301-
TO
U/V
TUNER
U/V
TUNER
IC7404-
D+3.8V
60,62
P7402
P59001
D+3.3V
XSW+5.8V
52
P7402
P59001
XSW+3.8V
4
P7501
P56101
XSW+5.8V_AV
2
P7501
P56101
7
P7501
P56101
34
P7402
P59001
ANA+5V
76
P7402
P59001
X SW+12V
64,66,68,70,72,74
P59001
P7402
POWER OFF
30
P59001
P7402
4
P1503
TO HDD
TO
DIGITAL
P.C.B.
DIGITAL
P.C.B.
TO
DIGITAL
P.C.B.
DIGITAL
P.C.B.
TO/FROM
DIGITAL
P.C.B.
DIGITAL
P.C.B.
FROM
TIMER
SECTION
TIMER
SECTION
FROM
TIMER
SECTION
TIMER
SECTION
1
P1503
25
AU+5V
DR+5V
DR+12V
P59001
P7402
14,16
P59001
P7402
22,24
DR+5V
P59001
P7402
L
8
JK56101-18
VIN
1
3
5
VO
(REG.+5V)
IC56105
CONT
IC56103/IC56107(+3.3V)
VIN
1
3
5
VOUT
(REG.+3.3V)
IC56104
ON
H
DR P ON
IC7501- 42
IC7501- 42
SECTION
TIMER
FROM
H
IC56103(+1.2V)
VIN
8
5
1
VOUT
(REG.+1.2V)
IC56106
ON H
H
HDMI P5 ON
IC7501- 54
IC7501- 54
8
P7501
P56101
16,17
P55003
FROM
DIGITAL
P.C.B.
DIGITAL
P.C.B.
P56103
XSW+1.8V
H
HDMI P3 ON
IC7501- 34
IC7501- 34
QR1503
H
( :ON)
8
6
4
5
DMR-EH68EC / DMR-EH68EP / DMR-EH685EG
48
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