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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: Skilled at solderwicking SMDs? Then, yes but you'll spend more time than it's worth. How-to get started. posted by Crazy Dave on May 10, 2012 at 11:17:58:
to observe the CD 'eye pattern' off of the RF test point. The CD RF Signal is at pin 45 test point of IC502, the chip is marked Toshiba TA1313F. The RF signal is also at pin 142 of IC401 marked TC9489F. Test points are on the main pc board “EU01”.
Typically, if a player is too sensitive to pit defects the focus gain and / or tracking gain will need to be decreased slightly. This is assuming that the sled mechanism is functioning correctly, it could be a bad spindle motor starting to fail or the laser diode pickup head may need to be replaced. Historically on many CD players one could adjust the servo gain manually but the Toshiba has automatic servo adjustment and if it is off they say replace the pickup head assembly. If one wishes to go beyond the service manual the servo control chip is IC503, marked KA3032. The Focus Coil is off IC503 at pins 37 ( + ) and 38 ( – ) they go to connector CN501 at pin 15, FC ( + ) and pin 18, FC ( – ) GND. The Tracking Coil is off IC503 at pin 36, TC ( + ) and pin 35, TC ( – ) and over to connector CN501 at pins 17 ( + ) and 16 ( – ).
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Follow Ups
- It's probably the focus gain and tracking servos, you'll need an oscilloscope - cfb 14:40:19 05/10/12 (7)
- RE: It's probably the focus gain and tracking servos, you'll need an oscilloscope - Crazy Dave 09:27:58 05/11/12 (6)
- Unfortunately Toshiba discontinued supplying many older parts in 2011. - cfb 11:28:11 05/11/12 (4)
- RE: Unfortunately Toshiba discontinued supplying many older parts in 2011. - Crazy Dave 13:35:28 05/11/12 (3)
- PS. Looks like a usable Toshiba spindle motor popped up on ebay in NZ, - cfb 07:49:26 05/12/12 (0)
- If you are interested in the technical side of CD players; here are two books to get you started. - cfb 07:47:02 05/12/12 (1)
- RE: If you are interested in the technical side of CD players; here are two books to get you started. - Crazy Dave 13:51:59 05/14/12 (0)
- Note - Crazy Dave 09:44:57 05/11/12 (0)
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