Rotel RCD 855 - CDM 4/19 Replacement - 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 2nd April 2014, 03:44 PM   #1
heybobo is offline heybobo  United States
diyAudio Member
 
Join Date: Jun 2005
Location: Vermont, USA
Default Rotel RCD 855 - CDM 4/19 Replacement

Hello,

I am into replacing the CDM 4/19 transport/laser assembly in a Rotel RCD 855 and have a couple of questions:

1. What is the proper procedure for separating the 14 pin foil connector from the pcb mounted jack (E101)?

2. I've seen reference to setting current to the laser by adjusting the voltage measured between test points to 50 mV. Can anyone comment on the proper procedure to accomplish this? Location of the test points? Which pot to use to do this? There are two pots, one of which (R108) is accessible, to the left of the transport, with the transport mounted on the pcb. The other pot (R129) is near the front of the board but is beneath the transport and is only accessible from underneath with the transport mounted on the board.

Any help would be much appreciated, especially about adjusting the pots. Also, are there other mods or refurbishments recommended while I'm under the hood?

Thanks and Regards,

RC
  Reply With Quote
Old 6th April 2014, 10:56 AM   #2
diyAudio Member
 
Ivo-Cici's Avatar
 
Join Date: Sep 2008
Location: Skopje+Ljubljana+Mantova
Send a message via MSN to Ivo-Cici Send a message via Skype™ to Ivo-Cici
Quote:
Originally Posted by heybobo View Post
Hello,

I am into replacing the CDM 4/19 transport/laser assembly in a Rotel RCD 855 and have a couple of questions:

1. What is the proper procedure for separating the 14 pin foil connector from the pcb mounted jack (E101)?

2. I've seen reference to setting current to the laser by adjusting the voltage measured between test points to 50 mV. Can anyone comment on the proper procedure to accomplish this? Location of the test points? Which pot to use to do this? There are two pots, one of which (R108) is accessible, to the left of the transport, with the transport mounted on the pcb. The other pot (R129) is near the front of the board but is beneath the transport and is only accessible from underneath with the transport mounted on the board.

Any help would be much appreciated, especially about adjusting the pots. Also, are there other mods or refurbishments recommended while I'm under the hood?

Thanks and Regards,

RC
Hi
According my srv/man. R129 (22K) foc. R108 (6K8) Laser supply..
And have fun...
regards
Cici-Ivo
  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
Rotel RCD 855 problem Moonmadness Digital Source 0 24th January 2014 12:35 PM
Rotel RCD 855 diagnostics...need help chromenuts Digital Source 9 10th January 2013 12:51 PM
Rotel RCD 855 Schematic P Howard Digital Source 0 18th May 2004 08:40 PM
Rotel RCD 855 tonitze Digital Source 16 30th June 2003 02:58 PM
Rotel RCD-855 users ashok Digital Source 1 5th August 2002 05:53 PM


New To Site? Need Help?

All times are GMT. The time now is 06:59 PM.


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