Power Supply Block Diagram - Panasonic DMR-EH55EC Service Manual

No.
1 Turn on the power, and confirm items pointed
out.
2 Insert RAM disc.
3 Enter the EE (TU IN / AV IN - AV OUT) mode.
4 Perform auto recording and playback for one
minute using the RAM disc.
5 Model with the HDD: Perform auto recording and
playback for one minute using the HDD.
6 If a problem is caused by a VCD, DVD-R, DVD-
Video, Audio-CD, or MP3, playback the test disc.
7 Models with SD Card Slot or DV Input Jack: In
case of that the trouble is caused by SD card and/
or DV terminal.
8 After checking and making repairs, upgrade the
firmware to the latest version.
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).
Use the following checklist to establish the judgement criteria for the picture and sound.
Item
Block noise
Crosscut noise
Picture
Dot noise
Picture disruption
Not bright enough
Too bright
Flickering color
Color fading
12. Block Diagram

12.1. Power Supply Block Diagram

Procedure
Contents
Items pointed out should reappear.
The Panasonic RAM disc should be recognized.
No abnormality should be seen in the picture,
sound or operation.
No abnormality should be seen in the picture,
sound or operation.
*Panasonic DVD-RAM disc should be used
recording and playback.
No abnormality should be seen in the picture,
sound or operation.
No abnormality should be seen in the picture,
sound or operation.
Models with SD Card or DV Input Jack;
1) SD Card: Check to be able to display and
the picture.
2) DV terminal: Check to be able to record
DVC.
Make sure that [FIRM_SUCCESS] appears
FL displays.
*[UNSUPPORT] display means the unit is
updated to newest same version. Then version
up is not necessary.
Make sure that [CLR] appears in the FL display.
After checking it, turn the power off.
Check Item
Distorted sound
Noise (static, background noise,
etc.)
Sound
The sound level is too low.
The sound level is too high.
The sound level changes.
49
Item to Check
Contents