Marantz CD-84/CD-74 service manual? - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th May 2009, 07:38 PM   #1
diyAudio Member
 
bleachershane's Avatar
 
Join Date: Jun 2008
Location: Glasgow, Scotland
Default Marantz CD-84/CD-74 service manual?

Anyone have the service manual for these?

Just got my second CD-84 on eBay and it turned up today so itching to get to grips with what this machine is capable of. At stock, it's not a miles away from with my modded CD-63 SE! In fact, it's slightly more 'musical' sounding to my ears...! Goodness knows how, with JRC4560 op-amps in place, it's just not right lol

My first one was rescued from a bin worked for a few years and died beyond repair a few years ago before I got into hi-fi modding and had been searching for one since to see what these machines could been capable of given some attention.

Always been mightily impressed by the sheer weight and build of these players and the tank like CDM-1 transports!

So, if anyone out there has the service manual I'd be eternally grateful!

Anyone else think these machines, despite the 14-bit TDA-1540, sound damn good? Or is everyone ripping these out and replacing them for the TDA-1541/A?
  Reply With Quote
Old 10th May 2009, 02:12 PM   #2
oshifis is offline oshifis  Hungary
diyAudio Member
 
Join Date: Mar 2004
Location: Budapest, Hungary
Hi,

My first CD-player was a CD-74 (bought second hand around '90), and I just recently replaced it with a CD-84... I modded it so much that even its developer wouldn't recognise it... I know it in and out, and I can give some ideas about modding it.

Here is the service diagram:

http://www.freeweb.hu/tube/Marantz.pdf
http://www.freeweb.hu/tube/Marantz1.pdf
.....
http://www.freeweb.hu/tube/Marantz7.pdf
  Reply With Quote
Old 10th May 2009, 11:50 PM   #3
diyAudio Member
 
bleachershane's Avatar
 
Join Date: Jun 2008
Location: Glasgow, Scotland
First off oshifis, THANK YOU! Like I said, it is much appreciated!

Secondly, as someone that's had extensive experience with the CD-74/84 it would be great to hear about what you've done and achieved with your own units!

At the moment, my CD-84 is very much at ground zero, completely at stock and untouched. Sounds good but the only plans I've even started to get etched is
1) a good resoldering job (lots of dry and ringed joints)
2) complete recap (Panasonic FM/FC for power supply uprating original capacitance values, not thought about other caps yet)
3) Replace JRC4560s with LM4562s (same op-amps as in my CD-63SE)
Will possibly remove voltage selector and hard wire for UK 240V use as well.

Very basic stuff to start off with as you can see. So please go ahead with your suggestions, I am looking to hear what you have done!
  Reply With Quote
Old 11th May 2009, 07:34 PM   #4
oshifis is offline oshifis  Hungary
diyAudio Member
 
Join Date: Mar 2004
Location: Budapest, Hungary
Here is what I have done (from memory):

- PSU diode bridges replacement to Schottkys
- PSU recap as large as fits in (1.5 to 2x original value)
- PSU 7805/7812s replaced to LM317 (some resistors added) <- biggest improvement
- output dual opamp replaced to a single version (OPA627), feedback 1.5k parallel 68pF. PCB cutting was necessary and a pair of DIP sockets were soldered in. Output filter stage removed.
- output capacitor replaced to WIMA MKS-4 4uF/63V (I know, I know...but it seemed a good idea then)
- NOS mod (http://www.freeweb.hu/tube/no_oversampling.pdf)
- TDA1540P STR1 signal reclocking with TTL 74S74
- Master clock replaced by a Motorola TCXO modded to 4.2336 MHz
- Rear PCB with variable resistors removed altogether with the black flat cable, but then I had to connect two pins at the other end of the flat cable, otherwise the motor did not spin up.
- I cut a rectangular opening in the middle of the power on button and inserted a red LED, connected to the error flag signal of the SAA7020 pin 36 through a transistor.

The problem with this unit is the tight internals.
  Reply With Quote
Old 20th October 2010, 06:26 AM   #5
noyan is offline noyan  Turkey
diyAudio Member
 
Join Date: May 2004
Location: istanbul
Send a message via Yahoo to noyan
Quote:
Originally Posted by oshifis View Post
Here is what I have done (from memory):

- PSU diode bridges replacement to Schottkys
- PSU recap as large as fits in (1.5 to 2x original value)
- PSU 7805/7812s replaced to LM317 (some resistors added) <- biggest improvement
- output dual opamp replaced to a single version (OPA627), feedback 1.5k parallel 68pF. PCB cutting was necessary and a pair of DIP sockets were soldered in. Output filter stage removed.
- output capacitor replaced to WIMA MKS-4 4uF/63V (I know, I know...but it seemed a good idea then)
- NOS mod (http://www.freeweb.hu/tube/no_oversampling.pdf)
- TDA1540P STR1 signal reclocking with TTL 74S74
- Master clock replaced by a Motorola TCXO modded to 4.2336 MHz
- Rear PCB with variable resistors removed altogether with the black flat cable, but then I had to connect two pins at the other end of the flat cable, otherwise the motor did not spin up.
- I cut a rectangular opening in the middle of the power on button and inserted a red LED, connected to the error flag signal of the SAA7020 pin 36 through a transistor.

The problem with this unit is the tight internals.
Hi,
I have a Philips CD104 and i want to install a clock like yours. May i learn, where did you buy Motorola TCXO 4.2336 MHz ?
Thank you,
Noyan
  Reply With Quote
Old 4th March 2012, 11:00 AM   #6
diyAudio Member
 
Join Date: Jan 2010
Quote:
Originally Posted by oshifis View Post
Here is what I have done (from memory):

- PSU 7805/7812s replaced to LM317 (some resistors added) <- biggest improvement
- Output filter stage removed.
Hi, nice recommendation , please write me more details about added resistors (scheme) , iam bought new ST Microelectronics LM317T regulators to replace 7805/7812 and i dont know what cause a direct replacement without adding resistors

Question 2) , Whats components represent output filter stage ? (2x electrolitic cap in opamp output ?)

Thanks for the advice and sorry my english is bad.

Last edited by wintermute; 4th March 2012 at 11:25 AM. Reason: fix closing quote tag.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
marantz pm 84 service manual mosfet1 Solid State 1 20th December 2010 07:47 PM
Marantz St-83 service manual chicco_36 Digital Source 1 19th December 2010 08:24 PM
Marantz CD 63 KI service manual leonlobo Digital Source 5 19th December 2010 08:24 PM
Marantz PM-50 Service Manual senee Solid State 0 6th September 2008 03:23 PM
service manual marantz sa-11 s1 ABO Digital Source 3 28th February 2008 12:34 PM


New To Site? Need Help?

All times are GMT. The time now is 07:41 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2