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MD-C2
• Although HF waveform is normal and time
indication is normal, no sound is not output.
Check the IC2 pin 48 (EFLG).
Check the IC2 pin 37 and 40.
Replace IC2.
Yes
Yes
No
Usually, the number of pulses of flawless disc is 100 pulses/sec or
less.
TROUBLE-SHOOTING (AMP SECTION)
• Although the power is turned on, the device does
not turn on.
Pin 54 on ICF01 changes from L to H.
Check between POWER key and pin 23
on ICD01.
When the POWER key is pressed, pin
23 of ICD01 will change from 5V to 0V.
No
Check between pin 54 on ICF01 and
Q900.
Power relay RL900 turns on.
No
The 5V_SWD line is powered up. (ZD806
cathode)
Yes
Check the serial communication line
between ICF01 and ICD01. Make sure
that the ON/STANDBY line is H.
Pin 41 of ICF01 changes from L to H and
stays there.
If the voltage changes from L to H to
L, check QV00, QV01, QV02 and
QV03 on the SP_PROTECT line on
pin 41.
Check the supply power to the MD unit.
Yes
Yes
Yes
Yes
Check the peripheral circuits for ICF01 and
also the RESET circuit.
Yes
No
No
Check the power circuit (F802, Q807,
ZD806 etc)
Check the power circuit (F803, Q809,
ZD805 etc)
4.75 < DVCC < 6.75
6.0 < AVCC < 7.0
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