Kenwood RD-M23 Service Manual page 9

• HF error.
Is output (tracking error signal) obtained at the pins 46 (TEI)
and 47 (TEZI) of IC802 the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
Yes
test mode "step 4" test mode "step 5"
TEI
TEZI
Is output (HF signal) obtained at the pin 38 (RFI) of IC802
when the CD TEST MODE "STEP 4" is changed to "STEP 5"?
Yes
test mode "step 4" test mode "step 5"
RFI
Is output (HF signal) obtained at the pins 41 (RFZI) and 42
(RFRP) of IC802 when the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
Yes
test mode "step 4" test mode "step 5"
RFZI
RFRP
Is the following wave output to the pin 55 (DMO) of IC802
when the CD TEST MODE "STEP 4" or "STEP 5"?
Yes
test mode "step 4" test mode "step 5"
DMO
Normal.
• No sound.
No sound from both L and R-ch?
Yes
Is +4.5V applied to pin 83 (DVDD) of IC802?
Yes
Is signal of pins 82 and 85 of IC802 output?
Yes
The main PWB is faulty.
Optical pickup failure.
Is output obtained at the pins 3 and
No No
8 of CNP802/CNW3.
Yes
Check the periphery of IC801. IC801 is faulty.
No
Check the PWB pattern between
pin 12 (TEO) of IC801 and pins 46
and 47 of IC802.
Is it normal ?
Yes
Check the PWB pattern between pin 49 (TRO) of IC802 and pin 19
of IC804.
Check the periphery of IC804 and CNP802/CNW3.
If OK. Optical pickup failure.
Is output obtained at the pins 4 and
Optical pickup failure.
5,6 of CNP802/CNW3.
No
No
Yes
Check the periphery of IC801.
Check the PWB pattern between pin 19 (RFGO) of IC801 and pins
38 (RFI) of IC802.
If OK. IC801 is faulty
Check the periphery of IC801.
No
Check the PWB pattern between pin17 (RFRP) of IC801 and pins
41 (RFZI) and 42 (RFRP) of IC802.
If OK. IC801 is faulty.
Check the periphery pins 28~32 of IC802.
No
If OK. IC802 failure.
Check the interval between the pins 82 or 85 of IC802 and the pins
No
2 or 5 of IC901.
Check the PWB pattern between R819 and Q861.
No
Check the peripheral parts of IC802. If OK, IC802 is faulty.
No
• Track search failure
Does the sled motor run in FF/REW state when the SERVO
TEST MODE "STEP1" is set?
Yes
Is the following wave output to the pin 49 (TRO) of IC802
during track search in normal playback?
Yes
TRO
Is the following wave output to the pins 12 (TEO) of IC801
during track search in normal playback?
Yes
TEO
TEI
TEZI
Is the above wave output to the pins 46 (TEI) and 47 (TEZI) of
IC802 during track serch in normal playback?
Yes
Is the following wave output to the pin 41 (RFZI) and 42
(RFRP) of IC802 during track search in normal playback?
Yes
RFRP
RFZI
Normal.
• Sled motor operation failure.
Is following sled feed signal output the pin 53 (FMO) of IC802
when FF /REW key is pressed after the CD TEST
MODE "STEP 1" is seted?
Yes
FF REW
FMO
Is following sled feed signal output the pins 3 and 4 of IC804
when FF /REW key is pressed after the CD TEST
MODE "STEP 1" is seted?
Yes FF REW
SL ±
Is sled feed signal output the pins 1 and 2 of IC804?
Yes
Is sled feed voltage applied between both terminals of sled
motor?
Yes
Check the CD mechanism (periphery of sled motor).
If the sled motor does not run when DC2.0V is applied to
both terminals of sled motor, the sled motor is faulty.
• Sled servo failure.
Is following sled signal output the pin 53 (FMO) of IC802
during playback?
Yes
FMO
Normal.
Check as stated in item "SLED MOTOR OPERATION FAILURE".
No
IC802 failure.
No
Check the PWB pattern between pin 49 (TRO) of IC802 and pin
No
19 of IC804.
Check the PWB pattern between pins 17 and 18 of IC804 and
Optical pickup.
If OK. Optical pickup failure.
Check the PWB pattern between pin 12 (TEO) of IC801 and pins 46
No
and 47 of IC802. If OK. IC801 failure.
Check the PWB pattern between pin 17 (RFO) and 18 (RFIS), 19
No
(RFRP) of IC801 and pins 41 and 42 of IC802. If OK. IC801 failure.
C801 is faulty.
No
Check the PWB pattern between pin 53 of IC802 and pins 3 and 4
No
of IC804.
Check the peripheral parts of IC804. If OK, IC804 is faulty.
No
Check the CNW803/CNS803.
No
IC802 is faulty.
No