Kenwood RD-M23 Service Manual page 8

• Laser failure.
Is +6.2V applied to the emiter of Q861 ?
Yes
Is +5V applied to the collector of Q861 ?
Yes
Is +5V applied to the pin 62 (VDD) of IC802 ?
Yes
Is +5V applied to the pin 1 (VCC) of IC801 ?
Yes
Is 0V applied to the pin 57 (SEL) of IC802 ?
Yes
No
Is approx. 2V applied to the collector of Q801.
Yes
Check CNP802/CNW3. If it is normal, the optical pickup is
faulty.
• Focus failure.
Does the optical pickup move up and down when the disc is
removed?
Yes
Is the following waveform ouput at the pin 43 (FEI) of IC802
when the disc is set?
Yes
pin 43
(FEI)
pin 48
(FOO)
pin 44
(SBAD)
Is the waveform shown above input at the pin 44 (SBAD) of
IC802?
Yes
IC801 is faulty.
Check the PWB pattern between emiter of Q607 and emiter of
No
Q861.
Check the peripheral parts of IC804 and Q861.
No
Check the PWB pattern between collector of Q861 and pin 62 of
No
IC802.
Check the PWB pattern between collector of Q861 and pin 1 of
No
IC801.
Does the laser come on when pattern cut between pin 8 (SEL) of
No
IC801 and pin 57 (SEL) of IC802 ?
Yes
Check the PWB pattern between IC701 and IC802 (BUCK/CCE/
BUS0~3)
Check the peripheral parts of IC801 and Q801. If it is normal, the
No
optical pickup is faulty.
Check as stated in item "FOCUS SERVO SAWTOOTH WAVE
No
FAILURE".
Check the periphery of IC801 and CNP802/CNW3. Is it normal?
No
Yes
The optical pickup is faulty.
Check the pattern between pin 13 of IC801 and pin 44 of IC802.
No
Check the periphery of IC801 and CNP802/CNW3.
• Focus servo sawtooth wave failure.
Is sawtooh wave output to the pin 48 (FOO) of IC802 ?
Yes
1.5~2.5sec
Is +6.2V applied to the pins 21 and 22 (VCC) of IC804 ?
Yes
Is sawtooth wave obtained between pins 26 and 27 of IC804 ?
Yes
1.5~2.5sec
Is sawtooth wave obtained between pins 13 and 16 of
CNP802/CNW3 ? (as shown above)
Yes
CNP802/CNW3 connection failure or optical pickup failure.
• Spindle motor clv servo failure.
Is following wave output to the pin 55 (DMO) of IC802 when
the CD TEST MODE "STEP 3" is changed to " STEP 4" ?
Yes
DMO
Is above wave obtained between pins 11 and 12 of IC804 ?
Yes
Is above wave obtained between pins 9 and 12 of CNP802/
CNW3 ?
Yes
CNP802/CNW3 connection failure or optical pickup failure.
IC802 is faulty.
No
Check the PWB pattern between pin emiter of Q607 and IC804.
No
Is +5V applied to the pin 7 Check the PWB pattern
No
(MUTE) of IC804 ? between pin 7 of IC804
No
and pin 60 (CD STB) of
Yes
IC701.
Check the PWB pattern between pin 48 (FOO) of IC802 and pins
24 and 25 of IC804. If OK. IC804 is faulty.
Check the PWB pattern between CNP802/CNW3 and IC804.
No
Check the procedure in "HF ERROR".
No
If OK. IC802 is faulty.
Check the PWB pattern between pin 55 (DMO) of IC802 and pins
No
9 and 10 of IC804. If OK. IC804 is faulty.
Check the PWB pattern between CNP802/CNW3 and IC804.
No