@Timo The microcontroller needs to initialize (engage FWD, REV, STOP) before any input from the buttons will work. What happens when battery is...
What happens if you remove R305 from the circuit ? What about the power LED, does it remain on even after 1 press ?
I agree with @novrain2012 that it's more likely problem is caused by a cracked trace or open via rather than faulty transistors. Would add it's...
Left VU-meter acts as battery level check (see the green marking), that's why only the left needle moves.
This only happens when powered via DC in jack, not with batteries ? That 320mA current draw being exactly the same when on and off, but nothing...
The strobe gear is used for reel rotation detection only. In some decks (which have such sensors on both reels) it can also be used to determine...
Given the signal from the radio goes through S301 (radio/tape switch) into volume potentiometer, it's obviuous everything past this point (volume...
That sensor CB with photo detector was replaced together with main PCB ? An autoreverse loop is tied to the reel sensor signal, either the sensor...
Glad you found the thread useful ! Regarding the spring that pulls the head bridge up, indeed that's not fitted on all DDs. DD33 in particular...
Assuming the gears turn freely (not clear if you cleaned that middler gear), the problem is in the electronics. Sled motor is very unlikely to...
Fact CD is spinning up and down only tells that player is unable to read ToC. However that can have more than 1 cause (too much play in spindle...
Note you need to actually remove that gear and clean the old lubricant from both shaft and gear hole. Second aspect is D-Z555 have problems with...
Both reels spinning after the adjustment means the center disc has excessive up/down wobble. The original gear assembly (center hub, disc, gear)...
All capacitors laid on one side need to be replaced, this type goes bad all time. These can be replaced with SMD tantlums which will fit nicely....
Regarding the flutter issue, recommend reading this thread:...
Regarding potential common problems, what I would check are pads of capacitors that leaked. Seen on these seires that hairline cracks thend to...
@Moisie2000 The first problem seems auto-off related. Does the power LED also turn off when it halts ? Second problem isn't clear. Backtension...
There are 3 things to be considered: 1. the roller tilt; I know in many units this won't create a problem, but it's something worth adressing as...
You need to identify that short and fix it. Fact problem re-appears when unit is turned on its back means gravity affects it. I would start by...
Only potential solution is to sand the plastic hub, 0.2mm on each side, assuming the hub is significantly taller than the rubber. In regard to...
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