MHZ 66一個很嚴重的問題

Is the same problem occur to the MHZ CD33? they use similar circuit right?

My God!!! my bada HD-21 using same circuit as this mhzs cd 33.
I also found got "pak sound sometimes.

The volatage acrross the 2 cap(100uF/100v) is ~ 75v, across the 47uF/160v CAP is 114.5V, then voltage supply to the 2nd board (to the 1uF/250v) cap near the tube is ~81V.
to measure輸出波, just simply use a osciloscope(20MHz) should be enough right? which point shall i put the probe to measure the wave form?

KK Sir,

Below is the voltage reading i had measure:

at A (100UF/100V ECAP) = ~79V
at B (47UF/160V ECAP) = 114.7V
at C (+75V TO GRN -word print on pcb) = 81.7V
at D (diode) = 79.7V

the supplier from point C will connect point E in the other board which consist of 6n3 tube & 1uf/250v solen cap.

at E, V=~81v

at tube (6N3) pin 2 & pin 6 , voltage -->~53v

i not yet use OSK to see the wave form. If in case it really roll off at 10kHz, what can i do?

Do u mean that change the diode at point D can solve this problem?

KK Sir,

It is BADA HD-21, Is's circuit ~ 80% same as CD33 So i'm not sure it will have similar problem as cd33 or not? i still not check the wave form (waiting for the tools).

Maybe my ear not good, can't really feel roll off after 10khz....

pure_ hire,

Ask your friend check all connection especially the ribon cable (better using multimeter because hairline break can't be detect visually.
if still not ok, then check
1) lens, see got laser output not(u should see red colour light, also see got scartches not?
2) see got unusual movemonet of the laser head or motor.
the cd66 still use KSS 213Q right?

common fault happen in this cd pickup is:

1) flat/ribbon cable defective/break
2) cable connection loose.
3) laser not output
4) in case u had adjust the white button at the back --> the control chip behind may damage & cause unsual movent/total breakdown or laser output failure

easier way is to change the whole laser pickup assembly (include motor), i think should be <hk50.
i had change my laser pickup kss-213C 2months ago.

incase u buy thr new cd pickup & install yourself, don't forget to remove the safety soldering point...

Why,

I thought u already heavily mod your shanling?? still need further modification?

Dear KK sir,

can you draw me a correct wave form if a CDP working properly?