Dowser
Learning to bodge again..
Bought this a while back, sold as faulty, I paid a bit more than I wanted (CHF 90.-), but I've always wanted to listen to one since repairing them when working for Lasky's service department (and never being able to afford one ) - it's a bisic Philips machine with a dedicated Mission output stage/PCB.
I was expecting something simple, but loads of repair shop stickers on the back of it rang alarm bells. Damned thing had 4 seperate faults, like it had been used as a parts donor for other repairs...but strange given it's a higher end player.
1. Mech loading tray gear broken
2. Mech to control panel wires broken within the Philips connector
-- For these 2 I just swapped in a mech from a lowly CD-1006 I got for CHF 10.- a while back
3. DAC/Servo PCB to control PCB connectors wires broken at both ends causing multiple intermittent problems
-- I've heard of these issues before, but never experienced them - the solid core wire snaps within the insulation by the connector. See below - pain in the ass, but quite straight-forward to strip and re-terminate
4. Short circuit BC818 12v supply to servo surface mount transistor
-- Stolen from CD-1006
God alone when this thing was last played, or the state of the caps - but it's functional again and sounds pretty damned good - really hard edged & detailled bass so far after 30 mins, interested to see how it develops.
I wanted to try a few machines with different output stages, as I intend to experiment with both a valve output stage and a very simple transistor buffer output stage to try and understand what makes a player good. This one is a target for a TDA1541A chip, replacement decoupling TDA caps (uses the stock Philips low end SMTs currently), and /B 7220
Wow - it just snapped into focus after 45 mins - as good as my CDI? No, clearly not, but I don't feel so bad about the 5 hours its taken me get this damned thing back to life now - great imaging, detailed bass just let down a bit by top end. Need to recap I think.
Has anyone else heard a Mission PCM 7000?
Piccies
Best display of any CD player? I like it
Short circuit (base-collector) transistor
In bits after finally getting it working (missed photo of deciated output PCB, sorry - but just using standard Philips PSU 5v and +/-15v rails, sure dedicated rails would help)
Careful re-termination of Philips connector
Shit picutre of done, sorry
Richard
I was expecting something simple, but loads of repair shop stickers on the back of it rang alarm bells. Damned thing had 4 seperate faults, like it had been used as a parts donor for other repairs...but strange given it's a higher end player.
1. Mech loading tray gear broken
2. Mech to control panel wires broken within the Philips connector
-- For these 2 I just swapped in a mech from a lowly CD-1006 I got for CHF 10.- a while back
3. DAC/Servo PCB to control PCB connectors wires broken at both ends causing multiple intermittent problems
-- I've heard of these issues before, but never experienced them - the solid core wire snaps within the insulation by the connector. See below - pain in the ass, but quite straight-forward to strip and re-terminate
4. Short circuit BC818 12v supply to servo surface mount transistor
-- Stolen from CD-1006
God alone when this thing was last played, or the state of the caps - but it's functional again and sounds pretty damned good - really hard edged & detailled bass so far after 30 mins, interested to see how it develops.
I wanted to try a few machines with different output stages, as I intend to experiment with both a valve output stage and a very simple transistor buffer output stage to try and understand what makes a player good. This one is a target for a TDA1541A chip, replacement decoupling TDA caps (uses the stock Philips low end SMTs currently), and /B 7220
Wow - it just snapped into focus after 45 mins - as good as my CDI? No, clearly not, but I don't feel so bad about the 5 hours its taken me get this damned thing back to life now - great imaging, detailed bass just let down a bit by top end. Need to recap I think.
Has anyone else heard a Mission PCM 7000?
Piccies
Best display of any CD player? I like it
Short circuit (base-collector) transistor
In bits after finally getting it working (missed photo of deciated output PCB, sorry - but just using standard Philips PSU 5v and +/-15v rails, sure dedicated rails would help)
Careful re-termination of Philips connector
Shit picutre of done, sorry
Richard