ICF-SW77 SERVICE MANUAL PDF

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SONY ICF-SW AUDIO - SERVICE MANUAL. Type: (PDF). Size MB. Page Category AUDIO SERVICE MANUAL. If you get stuck in repairing a. Page 1. Page 2. Page 3. Page 4. Page 5. Page 6. Page 7. Page 8. Page 9. Page Page Page Page Page Page Page Page Page ICF-SW SERVICE MANUAL. US Model. Canadian Model. AEP Model. UK Model. E Model. Australian Model. SONY. S in PS. ***. 3. ". ***. 1 st.


Icf-sw77 Service Manual Pdf

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Receiver. ICF-SW77 Receiver pdf manual download. Receiver Sony STR- K - Multi Channel Av Receiver Service Manual. Multi channel av receiver ( Sony ICF-SW77 Pdf User Manuals. View online or download Sony ICF-SW77 Operating Instructions Manual, Specifications. Sony ICFSW This free service manual has not been added to the website yet. You can request the service manual by sending an email. You will receive an .

The 1 trouble spot in this receiver are the surface mount electrolytic capactors used.

SONY ICF-SW77 service manual download pdf repair instruction scheme free

If some are affected, the others usually are not far behind. For repair, I would suggest a workshop capable of fixing PC hardware and such if you can't do it yourself - the set is sufficiently high-tech.

All surface mount! With the service docs and the notes provided on this page, they should have no trouble repairing the set provided the main board has not been damaged by leaked electrolyte.

Have C replaced by a suitable tantalum or ceramic capacitor; if there only is an electrolytic at hand must be pretty tiny! This does not appear to be a very common failure. Disassembly guide The service manual is not too detailed and only shows basic disassembly. This kind of repair requires a fine-tipped soldering iron preferably a temperature controlled soldering station , a steady hand and good sight.

Experience with surface mount parts is recommended. A scope may be useful in problem diagnosis. Unfortunately for the poor cap, there is no bypass capacitor for it that would work better at high frequencies the converter itself works at 1. Instead, C, which has pretty high losses at that kind of frequency, has to endure all the ripple by itself, thus getting heated up and ultimately drying out prematurely. C69 is situated near the CX It's probably "just" unreliable.

This must not be too large or it will interfere with the battery compartment to PCB contacts. C68 on the ripple filter input may also be worth changing.

Service manual for Radio SONY ICF-SW77

My attempts with parts more recently qualify as modern art at most - and that was with a suitable microscope. Incidentally, when the left output channel ultimately decided to stop working a few years later, the set had the remaining surface mount electrolytics replaced in early The old ones were checked with a capmeter during the process, they didn't measure up very well any more. Audio amplifier cap notes If power-on pop noise occurs, the primary suspect is C, which connects to an amplifier pin for pop noise suppression.

Some pop noise under reduced voltages is normal though. In case of low audio levels, I would turn my attention to C and C Resistances of only several kOhm has been found when probe tips were about a millimeter apart on the PCB.

This caused wrong voltages on the varicaps in series with kOhm!

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At first, not knowing what the real cause was, I replaced the varicaps of the FM-section Sony was so kind to supply me two for free , which helped for some months because I cleaned the PCB as well.

Then I only cleaned the area around the varicaps, which also helped.

Finally, when I realized the leakage, I replaced all 23 electrolytic capacitors except the one in the 14V DC-DC converter in the shielded box.

This seems to work! No bad FM-reception and unstable tuning anymore. This repair may easily damage your PCB.

Sony ICF-SW77 Manuals

Do not try to unsolder the electrolytic capacitors, just crunch the capacitors so that you can unsolder the leads individually. Naturally, the FM section wasn't working.

Varicap tuning voltage was high 14V due to no VCO output. I replaced the electrolytic capacitor on pin 23 of CX Initial tests were encouraging, showing the varicap tuning voltage was about 8VDC I had played with T10 tuning inductor. I think this is the fix!

And indeed, changing C69 turned out to be the solution to the "no FM" problem. However, you must not choose a capacitor that is physically too large, since then the battery-to-circuitboard contacts may no longer make proper contact. But as the saying goes, all is well that ends well, and now Ben's SW is working just fine!

You need to take out the speaker easy , unclip the computer PCB and loosen the interconnecting ribbon cable fussy before you even have a chance to get the main PCB off the chassis.

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Beware of the rod antenna wires, you may want to unsolder them their positions can be seen in the service manual. It has served me well for many years, until when I suffered two failures. I thought your readers would be interested in the two failures and the solutions.

AC Power Intermittent Symptom: The radio works with batteries, but is intermittently on and off when using the "wall wart" power supply AC power adapter.

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We will send you an email invoice with combined shipping to save you money along with payment options info.If some are affected, the others usually are not far behind. This can be taken even further, by the way. C69 is situated near the CX Capacitor related troubles Like several other approx.

Cure: The problem is that the coaxial power plug has gone in and out many times over the years and loosened the jack.

LYNELL from Pittsburgh
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