Kenwood DMC-G7R Service Manual page 5

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
No
button or main unit button is pressed?
Yes
Does the display operate normally?
No
Yes
Is playback state set?
No
Yes
Is audio output normal?
No
Yes
Is recording/playback operation normal?
No
• Power is not turned on when the / button
is pressed.
Is power turned on when the remote control button is
pressed?
No
Is operation normal when the main body button is pressed?
Yes
No
Is the pin 26 of IC401 in H state?
No
Yes
Are IC401 pin 50 set to "L"?
No
Yes
Is clock supplied to the pins 83 and 86 of IC401?
No
Yes
Is 2.5V applied to TP201?
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".
Perform the check stated in item "Playback state connot be
set".
Perform the check stated in item "Audio playback circuit".
Perform the check stated in item "Recording/playback
operation".
Check the periphery of remote controller and main unit
headphone terminal (J703) and IC401.
Check the position of Hold switch.
Check the DISC IN (SW904) switch of mechanism PWB.
Check that voltage is applied to the periphery of IC403.
Check whether there is solder touch of part connected to
the +2.5V line.
• Abnormal display
Is waveform output from CNS 402 pins 1 to 3?
No
Are the pin7 (VCC) and pin 6 (GND) normal?
Yes
Check for pattern breakage of flexible PWB, check for
defects of display microcomputer (replace the display unit).
• Playback state cannot be set
Is playback state unsettable for high reflection disc and low
reflection disc? Yes
No
Only the high reflection disc cannot be played back.
Yes
Is the pin 46 of IC401 in L state when the high reflection disc
No
is inserted?
Is the pin 51 of IC401 and pin 23 of IC101 in L state?
Yes
Proceed to "Test mode check".
Only the low reflection disc cannot be played back.
Yes
Is the pin 46 of IC401 in L state when the high reflection disc
No
is inserted?
Is the pin 51 of IC401 and pin 23 of IC101 in L state?
Yes
Proceed to "Test mode check".
Is waveform output from IC 401 pins 13 to 15?
No
Yes
Check the periphery of IC401.
Check between IC401 and
CNS402.
Proceed to "Test mode check".
Check SW902, mechanism flexible PWB and CN601.
Check SW902, mechanism flexible PWB and CN601.