Kenwood DMC-G7R, Service Manual

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DMC-G7R
5
TR
OUBLE SHOO
TING
• Abnormal display
No
Yes
Is waveform output from IC 401 pins 13 to 15?
Check for pattern breakage of flexible PWB, check for
defects of display microcomputer (replace the display unit).
Is waveform output from CNS 402 pins 1 to 3?
Are the pin7 (VCC) and pin 6 (GND) normal?
• Playback state cannot be set
Is playback state unsettable for high reflection disc and low
reflection disc?
Yes
Check between IC401 and
CNS402.
No
Check the periphery of IC401.
Proceed to "Test mode check".
Yes
Only the low reflection disc cannot be played back.
Only the high reflection disc cannot be played back.
Yes
Is the pin 46 of IC401 in L state when the high reflection disc
is inserted?
Is the pin 51 of IC401 and pin 23 of IC101 in L state? Check SW902, mechanism flexible PWB and CN601.
No
Proceed to "Test mode check".
Yes
No
Yes
Is the pin 46 of IC401 in L state when the high reflection disc
is inserted?
Is the pin 51 of IC401 and pin 23 of IC101 in L state?
No
Proceed to "Test mode check".
Yes
Check SW902, mechanism flexible PWB and CN601.
It is advisable to use the TEST mode (refer to Error Data Display Mode, P15) indicating the causes of troubles before
starting repair. Causes of operation errors (up to 10 errors) are recorded as error codes. This information is useful
for repair.
When does not function
When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not operate.Clean
the objective lens,and check the playback operation.When this section does not operate even after the above step is taken,check
the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC(Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup lens.
Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."
Turn the power off.
Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.
Do not touch the lens with the bare hand.
Is the power supply turned on when the remote control
button or main unit button is pressed?
No
Perform the check stated in item "Power is not turned on
when the PLAY button is pressed".
Perform the check stated in item "Abnormal display".
No
Yes
Does the display operate normally?
Is playback state set?
Yes
Perform the check stated in item "Playback state connot be
set".
No
Is audio output normal?
Yes
Perform the check stated in item "Audio playback circuit".
No
Is recording/playback operation normal?
Yes
Perform the check stated in item "Recording/playback
operation".
No
• Power is not turned on when the / button
is pressed.
No
No
Yes
Check the periphery of remote controller and main unit
headphone terminal (J703) and IC401.
No
Is the pin 26 of IC401 in H state?
Is operation normal when the main body button is pressed?
Check the position of Hold switch.
Is power turned on when the remote control button is
pressed?
No
Are IC401 pin 50 set to "L"?
Check the DISC IN (SW904) switch of mechanism PWB.
Yes
Yes
Is clock supplied to the pins 83 and 86 of IC401?
No
Check that voltage is applied to the periphery of IC403.
Yes
Is 2.5V applied to TP201?
No
Check whether there is solder touch of part connected to
the +2.5V line.
DMC-G7R(k)
COVER(
98.4.24
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PM
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