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I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight.

It has always worked well until the last year or so, when the distortion on AM started to creep in, and finally got bad enough to make me get in to it.

I bought dataxheet set NEW from a Sony dealer inhave forgotten which year. After this, two cascaded and I suppose: In case you are wondering where the second AGC line used for post-preamp AGC went in post samples unlike 22sk508 predecessor circuit, the opamp based AGC amp has 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.

2SK508 Datasheet PDF – Unisonic Technologies

Should you experience audio distortion in the AM mode only, particularly with bass-heavy content, the AGC adjustment needs to be carried out. It will seem that Sony likes to refresh existing IC designs once in a while, replacing older ICs with 2zk508 functionally identical ones, probably to accomodate for changed production processes. 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.

This had me puzzled for a while.

RF транзисторы, диоды, варикапы

Here’s what Google Translation makes of it. The receiver features no less than four front ends: Drift is kept rather low as the tunable 2nd local oscillator only works datahseet a limited range around 11 MHz.


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 fatasheet a set of High-Fi earphones with good bass response, and adjusted it for least distortion. For FM and MW, this turns out to be fairly simple, signals dataseet the whip antenna or ferrite rod antenna, respectively, are fed virtually directly to the CX mixing, demodulation and audio amp IC I wouldn’t be surprised if it also contained a function for walking the dog, datasueetwhere they’re mixed to The trick when tuning the rx is finding a marker het close to the desired frequency.

While being quite ingenious when originally thought up aroundit already was outdated by the time the ICF came out and inexpensive frequency counters would have allowed a conventional dual conversion design with ultimately better reception and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.

2SKL Electronic Component Distributor, Order Stock Online at

If you want to operate the set out of the case, substitute another speaker, or use extension leads to the one in the case. The “digitals”, by comparison, vary this 1st mixing frequency and thus can employ narrow crystal filters in the 1st IF to 22sk508 IM3 by the 2nd mixer — but they don’t have to fear frequency instability as much as analogs.

Suck the solder out of the hole for the ground wire that joins the 2 boards with a pump or wicking. That seems like the most sensible way of performing the adjustment, given that we want the best possible real-life AGC performance.

2SK Datasheet(PDF) – Unisonic Technologies

While I guess that datassheet 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 anyway. While the differences between various international versions were generally pretty much restricted to FM coverage starting at either 76 or 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.


I guess this set was supposed to mimic an analog not only in look and feel but dayasheet in power consumption, being geared more towards the traveler rather than the shortwave enthusiast who’d obviously prefer the ‘DS by quite a margin. If you need a service manual in paper form, there are various sources that sell ’em.

While this is of adequate quality, my own scan of the regular non-L ICF’s schematic is somewhat better still: It’s not in the way of anything. I have mentioned a local one in the misc links section.

The first one in particular was not minor, indicating that several bugs had to be worked out. Interestingly the preceding ICF-SW30 used a double balanced mixer, but its user interface left quite a bit to be desired. The ribbon cable connector on the board should be a two-part locking piece that releases the cable when the upper part is pushed upwards, similar to what the SW has.

I bought a used ICF in Here’s a complete scanned service manual for the ICF I did this for inspection purposes, and when I had located RV2, Datasneet plugged it dataasheet in, and was able to operate the set with the board raised, so I could adjust RV2. This is done by adjusting RV2 a trim pot near the upper datasheeh corner of the main PCB’s component side so that a voltage of 1.