Greetings all,, I have been labouring over the Aforementioned player for an age, finally triumphant,, well sort of, more about that later but first, is anyone familiar with the model because I wonder if anyone else noticed the weird anomaly regards C110,, which is showing populated on the circuit diagram but is never populated in reality,, placing various values also yielded some strange logic behaviour,, There was also the effect of changes according to what gear cam was used,, Blue/white, Never did find further information about the stuff just mentioned,,, Leads me to reckon that the ic used for logic Comms is tailored to work with specific gear cams,, in certain mechanisms,(whilst keeping the mechanics mostly Alpha-2, there are variants such as if the model does recordings,, there is a J2 supplement manual for those models, I've read those too, the only mention of the specific gear cam used, was in the exploded diagram and details in the accompanying list of parts, but here all it read was (gear cam , rec), I have observed that for some non-recording types none the less used a ( rec, gear cam,)????? Were these other models that utilised the Alpha -2 chassis just using available parts with no rhyme or reason,,,, Any insight would be greatly appreciated it might help lift some of my confusion thanks.
Can you mark on the schematic where is this C110 ? At first glance can't find it. Would make sense the recording models are different, since there's a second solenoid to engage the erase heads and REC/PB switch. The blue and white camgears are associated with recorders/players ? Noticed some have blue camgears, but never examined what the exact differences are.
Greetings,, thanks for taking an interest,,, Still not 100% on how to use this site but I'm going to upload pl50 document,, Then I'll try to highlight the area. Might take a moment.
If you take a look at page 5, the components list you can note that C110, is there, also on the PCB, the area highlighted shows C110 is there,, I have searched every where on the electronic schematic,,, and it is not there,,, And as I've already mentioned I've never found a component in that position on PCB,, it ends up connecting in parallel with a higher value capacitor, C126, I think,, I'll confirm later,,the cap, C110 in question is supposed to be a 22nf, the locale when you trace ends up around the BBE/DSL Section on the PCB,,, When I discovered the anomaly I experimented with a few different values and saw some strange behaviour with player logic becoming a bit hit and miss.
I will try to remember to post pictures of both the white and the blue gear cams for a direct comparison they are different.
As explained by @Shaman32 I don't see that capacitor mounted or even on the electrical circuit .... From how it is connected to R106 it seems to be in parallel with C126 I think that's why Aiwa didn't mount it
Please see picture of gear cams,, it's clear that they have some similarities, especially underneath, topside view very different, I'm tempted to install the other one on a working pl50 to see if ET turns up. All very curious.
Here you have a comparison between the mechanics of my PL 50 and an Aiwa JL30 that records.... mechanically they seem the same... but evidently on the JL30 there will be a cam that will move in a way that can allow recording aiwa hs-pl50 without audio ..... restored | Page 5 | Stereo2Go forums
Indeed C110 is in parallel with C126 and has nothing to do with the logic control. Don't see how adding that capacitor could make the logic control misbehave. As far as camgears go, I just happen to work on a PX50 which has the blue camgear (see picture attached). So blue/white camgear is not related to recording functionality, rather the recorders have a second solenoid to engage REC (erase heads + REC/PB switch). Microcontroller used is the same TC9311F-014 in both PX30 (white camgear) and PX50 (blue camgear), so the difference is only mechanical.
Thanks for your contributions particularly valentin I liked what you had to say and indeed I ended up figuring that out with regards to C110, that it doesn't have any bearing on logic behaviour, at the time a few via's were not co-operating, that was the cause of my misunderstanding! Have had some experience with Alpha-2j' insomuch as I own a nice Kenwood,, which is very similar to one of the Aiwa's of the same spec,, can't remember what model Aiwa equates to my Kennywood CP-R750 (Analogue) Radio/recording There is definitely a solenoid for Rec function, Spot on it doesn't depend on cam positioning,, if I have this correct the are only 4 positions from default, it can be made to move into:- fwd /fwd play,, and rew/rew play Record function follows the same for fwd record, or rev record, I would have thought either or = the same so I would tend to agree with you that it is likely done with just the solenoid and energising the record electronics at the same time. The one thing about record models I would say is that they need a lot of turning torque to get those mechanics to engage, There is a lot more energy drain a lot of drag very essential to make sure all the sliding pieces do just that with very little friction Grease not necessary just straightness,.
That does it I'm officially going insane if you have a look at that blue gear cam your notice top side there's two little extrusions,,, Now please observe my picture
At this point, I think that these differences could possibly be due to model version/ upgrades from earlier model runs, or plain old sabotage. Lol What does it all mean hey we should all catalog each and every one of our gears and models from whense that came!
