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Old 4th October 2012, 09:34 PM   #11
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hi mooly, sorry for delay in replying,not tried the digi camera yet but I did locate a service manual,if you have time to take a look.Ive read some of it but very confusing to where to look for test points on pcb,as I said I only have a fluke multimeter at my disposal. llink to Manual should hopefully be below:
Arcam Diva CD73 | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine

thanks
tom.
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Old 5th October 2012, 08:16 AM   #12
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I'll try and take a look later...
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Old 5th October 2012, 09:28 AM   #13
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Page 9 of the manual, top left of circuit. You need to measure the volt drop across the 10 ohm resistor R101 during the brief moment the lens is performing the "focus search operation".

From this volt drop the current in the laser diode can be calculated. Many KSSxxx type pickups use the last three digits of the serial number on the pickup to show the current. For example 455152479487 would meant the current should be 48.7 milliamps. That would be a typical value and you would see 0.487 volts approx across the 10 ohm.

Its also extremely important to check ALL of the power supply rails are correct. This should be done first. Look for any reservoir caps that appear bulged at the top or that have leaked.
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Old 6th October 2012, 08:49 PM   #14
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Hi, thanks for taking time to have a look at the schematics, I will have a look tomorrow. Can you confirm where on the drawing the power supply rails are located? Sorry to be a numpty, but i,m learning as I go along,I have some knowledge of basic electronics,such as what components do, but reading how a complete circuit works is beyond my knowledge at the moment although I intend to get a book and start learning!!!!
thanks again,
tom
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Old 7th October 2012, 07:22 AM   #15
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Page 8

You need to be careful measuring as one slip with the meter could be disastrous. Connect the meter negative lead securely to chassis ground as all these voltages are measured with respect to this point. That can be the phono socket ground or the metal casework.

The main voltages to measure are the outputs of all the voltage regulators (the yellow rectangles). All the important voltages are given such as +5, +3.6 etc so check and confirm they all agree. If getting to the leg of the regulator is difficult then look for a nearby component it goes to and measure there.
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Old 10th October 2012, 10:18 PM   #16
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Hi mooly, getting strange readings via chassis earth and positive lead of multimeter to Most legs of accessable voltage regulators, basically not getting any dc readings at all? Checked input fuses for continuity and all ok too, also checked either side of input relays but again no dc readings at all, I'm confused any ideas?
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Old 11th October 2012, 06:53 AM   #17
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That sounds like the chassis isn't directly connected to the zero or ground of the PSU. Strange but could be normal non the less.

You should definitely get the correct readings by putting your meter negative lead onto the "outer" part of the audio output sockets as this is ground. Also if you look at the circuit and locate all the AGND (audio ground) and DGND (digital ground) points then these are ground too. The wiring and layout distinguishes between the two although in practice they will appear joined togetehr and the same point.

So try that and ask if you are not sure
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Old 17th October 2012, 05:20 PM   #18
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Hi again, been checking the voltage regulators on this arcam of mine and the only ones I can successfully check are U507, which is giving strange voltage readings of 1.25 and 1.34 on outer pins centre is 0v. Other vr U503 is giving readings of around 14/15v on outer pins.
All other vr's are very difficult to access and I'm afraid I'll touch something and cause a short!
It says in manual about checking tray micro-switches, any ideas as to what these look like, as I can't see anything obvious, I'm getting a little despondent as to a way of checking other voltage regulators on pcb easily?
Thanks
Tom
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Old 18th October 2012, 06:58 AM   #19
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It sounds like this is going a bit advanced for your abilities tbh

If a reg really is difficult to get to safely then look for parts that connect directly to those pins and measure there instead.

That said, if you really do have only a volt or so on U507 then have you checked the fuse FS501 Some of the supplies in this player are daisy chained with the 11 volts unregulated feeding first a 5 v reg and then the 3.6 volt reg. U507 is on that chain.

If the fuse is open circuit then prime suspects for it failing are a short circuit rectifier (BR501) or faulty reservoir caps C513 and C514. Caps are likely suspects. Make sure they are not bulged or leaking gunge and that the top has not "vented" and split.
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Old 18th October 2012, 07:17 AM   #20
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sorry to ask ...is the pick up the Kss 240 ?

if so chances that you have an operative unit in your hands are very very low The KSS 240 features 3 trimmers on the side and depending on the order and the batch tuning of the trimmers is far different....

Without the proper cd disc tuning by hand will be impossible ...

All the efforts i made there trying various Kss 240 versions failed still i got my chances in specific importer that supply me with VAM1202 and KSS213 and worked plug n play .
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