Kenwood DMC-G7R, Service Manual

Page: 6 / 30

DMC-G7R
6
TR
OUBLE SHOO
TING
Continued from the preceding page
In case of high reflection disc, proceed to the item "normal
playback".In case of low reflection disc, check whether
adjustment is within allowable range in the TOTAL level
adjustment step.
Check whether values of pins 10, 11, 14, and 15 of IC201 and
pins 30 and 32 of IC101 (TP143) change when the /
button is pressed.
No
Doesn't the disc motor run at high speed in the same step?
Check ADIP waveform of pin 4 of IC201.
No
Yes
Is tracking gain adjustment within allowable range in the
same step?
Check whether values of pins 16 to 19 of IC201 and TP144
(TEOUT) change when the / button is pressed.
No
Yes
Is adjustment within allowable range in tracking error
balance adjustment step?
Check whether value of pin 20 of IC201 and TP144(TEOUT)
changes or DC shift occurs when the / button is
pressed.
No
Yes
Is tracking servo applied in focus gain fine adjustment step?
Check waveforms of pins 54 and 55 of IC201, pins 18, 19, 21,
and 23 of IC601, pins 4 and 6 of CNS101.
No
Yes
Is slide servo applied in continuous playback step?
Replace IC201.
No
Yes
Yes
Check item "Normal Playback".
• Test mode check
Insert a high reflection (low reflection) disc, and once perform automatic adjustment in AUTO mode, and then check in MANUAL mode.
Simultaneously observe waveforms of EFM(TP145), FEOUT(TP143), and TEOUT(TP144).
Does the optical pickup move to outer/inner periphery when
the / button is pressed?
Check the pins 56 and 57 of IC201, the pins 25, 27, 29 and 30
of IC601, the pins 10 and 11 of CNS601, and the slide motor
terminal.
No
Is tracking error offset measurement within allowable range?
Yes
Check Vref values of pins 3 and 4 of IC101 and pin 22 of IC201.
No
Is focus error offset measurement within allowable range?
Yes
Check Vref values of pins 3 and 4 of IC101 and pin 22 of IC201.
No
Yes
Is laser power normal when laser lights?
Check the pins 21 and 22 of IC101, the pins 6 and 52 of IC401,
the periphery of Q101, Q102, and Q103, CNS101, and pickup
flexible PWB insertion.
No
Yes
Does focus access occur in focus gain rough adjustment
step?
Check the pins 52 and 53 of IC201, the pins 10, 12, 14, and 15
of IC601,and the pins 5 and 7 of CNS101.
No
Yes
Is adjustment out of allowable range?
Check whether values of pins 10, 11, 14, and 15 of IC201, pins
30 and 32 of (IC101) (TP143) change when the / button
is pressed.
No
Does the disc motor rotate in the same step?
Check as stated in item "The disc motor does not rotate".
No
Is focus servo applied in tracking gain adjustment step?
Check timing of pins 91 and 92 of IC401 and TP144(TEOUT).
No
Yes
Yes
Doesn't the disc motor rotate at high speed in the same step?
No
Check EFM waveform of pin 23 of IC201 in case of high
reflection.
Check ADIP waveform of pin 4 of IC201 in case of low reflection.
Yes
Is tracking gain adjustment within allowable range in the
same step?
Check whether values of pins 16 to 19 of IC201 and
TP144(TEOUT) change when the / button is pressed.
No
Yes
Is adjustment within allowable range in tracking error
balance adjustment step?
Check whether value of pin 20 of IC201 and TP144(TEOUT)
changes or DC shift occurs when the / button is
pressed.
No
Yes
Is tracking servo applied in focus gain fine adjustment step?
Check waveforms of pins 54 and 55 of IC201, pins 18, 19, 21,
and 23 of IC601, pins 4 and 6 of CNS101.
No
Yes
Is slide servo applied in continuous playback step?
Replace IC201.
No
Yes
Is cluster address counted up continuously in the same step?
Check waveforms of pins 53 to 56 of IC101 and pins 23 to 25 of
IC201. (In case of low reflection check also the waveform of pin
4 of IC201.)
No
Yes
Yes
Continued on the next page.
DMC-G7R(k)
COVER(
98.4.24
2:19
PM
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11