74DD8205B Marantz cass deck schematic/help please - UK Vintage Radio Repair and Restoration Discussion Forum

zens.tv · 21st Apr 2015, 3:22 pm

hi all,

this unit has no audio

have replaced leaked caps & check for through hole issues on read/write module,but same results

zens.tv · 21st Apr 2015, 5:08 pm

seems that someone has also worked on the head amp PCB and it's in a bit of a state

zens.tv · 22nd Apr 2015, 9:56 am

discovered a broken print track line,on head amp module

suspect it's due to the previous engineers handy work

crudmeister · 22nd Apr 2015, 12:34 pm

It would appear someone has gone in to replace SMD electrolytics with through hole types, probably due to the SMD's going bad - quite commonplace to find this now in 1980's/1990's as they seem to be failing in troops due to age.
Hope you got it fixed - if not, please let us know and you may get answers / help here.
All the best
Rob

zens.tv · 22nd Apr 2015, 3:58 pm

hi Rob,yes all working now.

to be honest,i always use minature through hole types.

don't trust those smd electrolytics.

21st Apr 2015, 3:22 pm	#1
zens.tv Retired Dormant Member Join Date: Oct 2014 Location: London, UK. Posts: 324	74DD8205B Marantz cass deck schematic/help please hi all, this unit has no audio have replaced leaked caps & check for through hole issues on read/write module,but same results

21st Apr 2015, 5:08 pm	#2
zens.tv Retired Dormant Member Join Date: Oct 2014 Location: London, UK. Posts: 324	Re: 74DD8205B Marantz cass deck schematic/help please seems that someone has also worked on the head amp PCB and it's in a bit of a state Attached Thumbnails

22nd Apr 2015, 9:56 am	#3
zens.tv Retired Dormant Member Join Date: Oct 2014 Location: London, UK. Posts: 324	Re: 74DD8205B Marantz cass deck schematic/help please discovered a broken print track line,on head amp module suspect it's due to the previous engineers handy work

22nd Apr 2015, 12:34 pm	#4
crudmeister Retired Dormant Member Join Date: Jan 2012 Location: Middlewich, Cheshire, UK. Posts: 237	Re: 74DD8205B Marantz cass deck schematic/help please It would appear someone has gone in to replace SMD electrolytics with through hole types, probably due to the SMD's going bad - quite commonplace to find this now in 1980's/1990's as they seem to be failing in troops due to age. Hope you got it fixed - if not, please let us know and you may get answers / help here. All the best Rob

22nd Apr 2015, 3:58 pm	#5
zens.tv Retired Dormant Member Join Date: Oct 2014 Location: London, UK. Posts: 324	Re: 74DD8205B Marantz cass deck schematic/help please hi Rob,yes all working now. to be honest,i always use minature through hole types. don't trust those smd electrolytics.