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This is far as I went with the dis-assembly, but it was obvious that all you have to do to strip the set completely, is unsolder the wires to the speaker and leave it behind, glued to the front panel. It has worked like new ever since. Suck the solder out of the hole for the datadheet wire that joins the 2 boards with a pump or wicking. In case you are wondering where the second AGC line used for post-preamp AGC went in post samples unlike its predecessor circuit, the opamp based AGC amp dagasheet only one outputlook at the first correction from supplement-1 — the main board schematic from the original service manual does not fully cover the changes.

This is done by adjusting RV2 a trim pot near the upper right corner of the main PCB’s component side so that a voltage of 1. This had me puzzled for a while. I bought this set NEW from a Sony dealer inhave forgotten which year. Now to the most interesting part, the shortwave bands, where the receiver works with dual conversion: The trick when tuning the rx is finding a marker het close to the desired frequency.

2k508 in fact, I think that much improved readout accuracy and improved stability were the main reasons for choosing this concept over a classic single conversion one, along with better image and spurious rejection.

It’s not in the way of anything.

After having studied the service manual of the ICF LI’d summarize the architecture of the datasheeg as follows:. Here’s what Google Translation makes of it.

RF транзисторы, диоды, варикапы

It will seem that Sony likes to refresh existing IC designs once in a while, replacing older ICs with new functionally identical ones, probably to accomodate for changed production processes.

The resulting versions are:. Interestingly the preceding ICF-SW30 used a double balanced mixer, but its user interface left quite a bit to be desired. It had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside. Incidentally, the venerable ICFW isn’t a Wadley receiver either, just an almost “normal” dual conversion rx with a tuned front-end and bipolar balanced mixer, btw that reuses some FM IF filters for the 1st SW IF, with a crystal-based marker frequency generator kHz and a slightly and precisely adjustable 2nd LO frequency thrown in.


While this is of adequate quality, my own scan of the regular non-L ICF’s schematic is somewhat better still: If you want to go further, unplug the ribbon cable and fold the board back.

The interesting part is that if you can’t find a datasheet for one version, one that covers another version generelly will also do plus you can still buy at least the current iteration of such a chip in case a replacement is needed. While the differences between various international versions were generally pretty much restricted to FM coverage starting at either 76 or The “digitals”, by comparison, vary this 1st mixing frequency and thus can employ narrow crystal filters in the 1st IF to reduce IM3 by the 2nd mixer — but they don’t have to fear frequency instability as much as analogs.

I have mentioned a local one in the misc links section. I bought a used ICF in In this form, it cannot reach the same raw reception performance as a “normal” dual conversion concept; this would have required both a tracking filter on the 1st IF and a beefier 2nd mixer.

The track side of the analog board is now visible.

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There is no mechanical reason to remove the speaker from the case. Sounds easy — however, fairly comprehensive disassembly will be required to get to this point, which is not entirely trivial see the next section as well as the linked Japanese page. I did not get a VM accurate to 3 or 4 decimal places to adjust it, I just tuned a strong local AM mw music station, Listened on a set of High-Fi earphones with good bass response, and adjusted it for least distortion.

Combining a wideband frontend with an unbalanced first mixer — as found in these inexpensive sets — is not a very smart thing to do, as 2nd order intermod quickly becomes a major problem. I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight.

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The “about” part is because the mixer takes its constant mixing frequency from a crystal oscillator with dafasheet crystals of Should you experience datashfet distortion in 2s5k08 AM mode only, particularly with bass-heavy content, the AGC adjustment needs to be carried out. My experience opening the set was not traumatic, I removed the 2sl508 long screws marked by the arrows on the backthen working along the first seam of the back cover with a pocket knife, discovered I should pry the back cover away from the thin adtasheet that runs around the set.


The shifted 75m coverage also means that the respective input tank circuit is peaked at instead of kHz, which does not make all that much sense given that actual stations are typically found between about to kHz.

I guess this set was supposed to mimic an analog not only in look and feel but also in power consumption, being geared more towards the traveler rather than the shortwave enthusiast who’d obviously prefer the ‘DS by quite a margin. That seems like the most sensible way of performing the adjustment, given that we want the best possible real-life AGC performance. ICF Additional information Servicing and internals.

There is a screw between the lower edge of the board and the battery compartment to be removed. I did this for inspection purposes, and when I had located RV2, I plugged it back in, and was able to operate the set with the board raised, so I could adjust RV2. Datadheet this, two cascaded and I suppose: Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 MHz.

This, BTW, uses a 2SKY FET and a variable mixing frequency that’s what you vary with the main tuning knob — a “digital”, by contrast, has a constant 2nd mixing frequency since the frequency variation part already took place one IF earlier.

The first one in particular was not minor, indicating that several bugs had to be worked out. Sony chose the 1st IF of While I guess that it won’t make a night-and-day difference, you may want to re-peak L3 at about kHz, preferably when you’re working on such a set datasheef.

Here’s a complete scanned service manual for the ICF While being quite ingenious when originally thought up aroundit already was outdated by the time the ICF came out and inexpensive dataxheet counters would have allowed a conventional dual conversion design with ultimately better reception and readout accuracy if not the same stability, always a problem with wide-range analog tuned oscillators.