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 19th June 2010, 09:10 PM   #1
Plundering the Planet From the Comfort of Home
diyAudio Member
 
DreadPirate's Avatar
 
Join Date: Jan 2006
Location: Northern Virginia, USA
Default Cambridge D500SE CD- No response to remote

The receiver on the player must be faulty, as the remote has tested successfully on another unit. The schematic seems to not be available, but I could probably figure things out as I go along. Where should I begin and what measurements should I take to narrow this thing down?
  Reply With Quote
Old 19th June 2010, 09:45 PM   #2
gootee is offline gootee  United States
diyAudio Member
 
Join Date: Nov 2006
Location: Indiana
Blog Entries: 1
If you have access to another unit, maybe you could open up both units and start comparing measurements between the good and the bad unit, near the receiver for the remote.
  Reply With Quote
Old 20th June 2010, 10:30 AM   #3
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
The receiver is almost certain to be an off the shelf 3 pin type. Check for 5 volts, ground and use a scope to confirm the data stream when a button is pressed.

HERO|HIM602H|PHOTODIODE, IR RECEIVER, HORIZONTAL | CPC From This Range&MER=e-bb45-00001003

Is there an option to "turn off" the remote via software/front panel button press sequence etc ? you just never know these days. If you haven't a 'scope a DVM might show some voltage change on the output pin as a button is pressed.
__________________
-------------------------------------------------------
A simulation free zone. Design it, build it, test it.
  Reply With Quote
Old 21st June 2010, 01:22 AM   #4
Plundering the Planet From the Comfort of Home
diyAudio Member
 
DreadPirate's Avatar
 
Join Date: Jan 2006
Location: Northern Virginia, USA
It appears Cambridge units use the TSOP18 photo module, same deal. It's going to be fund getting that panel off. I've also discovered the player cannot read the first track, tries then skips to #2, from which point it seems to work fine. The laser is the KSS-213C. I'll re-seat the ribbon cable when I get back to it.
  Reply With Quote
Old 28th June 2010, 12:00 AM   #5
Plundering the Planet From the Comfort of Home
diyAudio Member
 
DreadPirate's Avatar
 
Join Date: Jan 2006
Location: Northern Virginia, USA
I've got the thing apart. I'm measuring supply voltage of 4.85V. At idle, the output is about .100mv and does respond to pressing buttons on the remote, reads out around .340 mv. In pressing different buttons (play, rew, etc), I get very similar readings in the vicinity of .340mv, I'm using a multimeter, hard to tell if they are really different though. I'm at a bit of a loss, I was expecting there to be no output and/or a fixed output that does not respond to the remote, but that is not the case.

I did test the remote at the diode and it appeared to produce noticeably different output voltage when pressing different buttons, though I can't recall the values, something around .700mv or so. I did learn a trick, though, to see if the remote was producing output, looking through the viewfinder of a digital camera, does work.

The part number of the little board holding the photodiode on the player is AP10716/1. The photodiode was shielded and I did not want to remove the shielding to get at the photodiode identifier.
  Reply With Quote
Old 28th June 2010, 06:08 AM   #6
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
The TSOP18 is a complete receiver... these things are all basically the same, with main differences being in the centre carrier frequency filter within the receiver.
Your readings could well be OK... the output of the receiver is a series of high speed pulses of 0 to 5 volt approx which DVM's won't read correctly... they just give an indication.
.
If you have any other RC devices you can measure the output from the receivers on those to compare.

http://www.datasheetcatalog.org/data...shay/82143.pdf
__________________
-------------------------------------------------------
A simulation free zone. Design it, build it, test it.
  Reply With Quote
Old 28th June 2010, 01:38 PM   #7
Plundering the Planet From the Comfort of Home
diyAudio Member
 
DreadPirate's Avatar
 
Join Date: Jan 2006
Location: Northern Virginia, USA
Well I went ahead and removed the module's shielding, does not look like a TSOP18. I had gotten that info from another CA schematic. Is this a custom module? There is no info on the diode board itself, but the lower board has the following markings:

HF-03
94V0
4850-010080-001
AP10716/1

I might as well replace the board and see what happens, perhaps things have drifted a bit. The cap's esr is about 3 ohms and measures 42uf (47uf/6.3V), the esr is slightly higher than expected of 1 ohm, but probably not enough to be concerned about.
Attached Images
File Type: jpg IR Receiver.JPG (55.3 KB, 20 views)
  Reply With Quote
Old 28th June 2010, 02:21 PM   #8
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Not seen one exactly like that, however any standard type should work OK... if it's faulty, it may not be of course. You need to know the carrier frequency... if it's near enough it probably will work OK.
The supply will be across the electroylitic, and the wire that's left is the output.

A 'scope check is absolutely conclusive.
__________________
-------------------------------------------------------
A simulation free zone. Design it, build it, test it.
  Reply With Quote
Old 28th June 2010, 03:17 PM   #9
Plundering the Planet From the Comfort of Home
diyAudio Member
 
DreadPirate's Avatar
 
Join Date: Jan 2006
Location: Northern Virginia, USA
I can only find the service manual for the 640C and it does not identify the TSOP18 part enough to determine the carrier frequency. AP Part Number PY054. Anything here to indicate what the carrier frequency would be for mine? I'm guessing manufacturers would use the same carrier frequency to ensure interoperability of remotes?
  Reply With Quote
Old 28th June 2010, 04:03 PM   #10
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
38Khz is the common one. All it means is that when the IR LED in the handset is "on" it's actually pulsed at 38khz, so the receiever has a filter to remove this and output just ones and noughts.
__________________
-------------------------------------------------------
A simulation free zone. Design it, build it, test it.
  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
cambridge audio d500se schematic gari Digital Source 5 20th January 2012 05:15 PM
cambridge audio cd-6 chight Digital Source 0 25th November 2008 05:35 AM
CD-Rom controller including Remote Control and CD-Rom power supply BCP99 Swap Meet 2 22nd April 2007 02:03 AM


New To Site? Need Help?

All times are GMT. The time now is 03:13 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