Tearing Down a Portable cassette recorder from 1979 - Marantz CD 330 Superscope

An old customer sent me his portastudio for repair, and asked if I'd look at this Marantz CD 330 at the same time. The Superscope was a little out of my wheelhouse and I'd never workedd on one before, but I agreed to give it a go.

Initially this seemed like a very promising cadidate for a portable, desktop, master cassette recorder to pair with a portastudio or other multitrack cassette recorder, but it turned out that the build uses almost no detachable cables, and more types of screw and other fastener than I've ever seem in a single build, making access slow and tedious, and total dissassembly impossible without a lot of desoldering.

The unit had no DC power reaching the motor or audio circuit, and a jammed play mechanism. Perhaps a tech who specialises in these recorders would be able to resolve the issues quickly, or an enthusiast or hobbyist would enjoy the challenge, puzzle-solving aspect of this? And if time was no object, I'm sure I would have resolved these issues eventually, BUT since I would be charging the owner for this time, after consultation with him, we opted not to proceed with the repair.

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TETRAKAN - Fix & Use Tape Recorders

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If you are within posting distance of Scotland and would like me to repair or service your multitrack cassette recorder, there is an email contact form provided on my facebook page, or you can message me using facebook or instagram.

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CHAPTERS
0:00 Staying organised during a tear down
01:24 Detach cassette door
02:08 Remove bottom panel
02:57 screws around the battery compartment
03:13 Remove rear panel & desolder shielding
04:23 Screws running through PCB to front panel
05:24 Remove top panel & desolder speaker terminals
06:36 Detach speaker from top panel
07:46 First impressions fo the exposed technology
10:54 Take off knob and switch covers
11:50 Remove front Panel
12:49 Detach chassis & PCB 1 - front panel nuts etc
13:44 Detach chassis & PCB 2 - screws etc
14:27 Detach cassette player from chassis
15:39 Cut cassette player cable ties
16:06 Detach cassette player connectors
17:13 Guidance from the service manual dries up, and things get hairy...
17:21 Detach line in socket etc from chassis
18:13 Lamenting the scarcity of detachable connectors on this build
18:41 The cassette player cannot be detached without significant desoldering
22:36 Belt kit suplier and sizes
23:37 Fitting rubber belts
25:20 Remove pinch roller
26:10 PInch roller size
26:34 Problems with the unit
27:40 Beyond economic repair!