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MD-R3
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• Track search failure
Set the TEST mode, and check whether the slide motor is
started with (skip) (skip).
Check as stated in item "Slide motor fails to run".
Yes
I
s the following waveform output to the pin 29 of IC750 in track
jump state?
Yes
No
No
* The sate where the following waveform is output to the pin 17
of IC750 is referred to as track jump state.
IC750 is defective.
Is the following waveform output to the pin 17 of IC750 in track
search mode?
Yes
No
I
C750 is defective.
Check the display PWB.
Synchronization is set on
the pin 28 (JPI) of IC750.
Kick Pluse
17 PIN
This state must be set
after kick pulse is given.
(TSOUT)
TG
• Triangular wave for focus servo is not output.
Is +5V applied to the pin 36 of IC750?
+5V line of IC750 is defective.
Yes
No
Is triangular wave observed on the pin 22 of IC750?
No
Is the following triangular waveform
observed?
Check the pins 34
and 35 of IC750,
R780 and C769. If
OK, IC750 is
defective. (Check
also the line of pins
30, 31, and 33 of
IC901.)
No
Check the periphery of pin 23 of IC750. If it is normal, IC750 is
defective.
Yes
No
Signal line connection failure between pin 22 of IC750 and pin
3 of IC700
Is triangular wave input into the pin 3 of IC700? (Waveform
shown above)
Yes
No
Check the peripheral parts of IC700 and power line. If they are
normal, IC700 is defective.
Does saw-toothed wave appear between pins 1 and 2 of
IC700?
Yes
Yes
CNP751 connection failure or optical pickup failure
Does saw-toothed wave appear between pins 3 and 4 of
CNP751?
Yes
PWB pattern breakage
No
Saw-toothed waveform
1~2 sec.
(the wave swings once to +
side.)
• Sound is not output.
IIs digital signal output from the pin 6 (digital OUT) of CNP301?
No
Check the pin 28 of IC800.
No
Check Main and MD connection.
Is digital signal sent to the MD PWB and CN1904 pin 4?
Yes
Yes
No
Is audio signal output from the pins 24 an 26 of IC201?
Check connection of IC1201 and IC201.
OK
Yes