On Wednesday, August 1, 2018 at 2:14:38 AM UTC-7, Fotopiggie wrote:
Hi,

I own a clean Sony ICF-7600D (ICF-2002)...The only thing annoys me is that
while using MW & SW the frequency displayed on screen is off about 5kHz from
the actual frequency.
It would help if you provided more information. Is it the same amount and in the same direction for all frequencies, or does it increase/decrease with frequency? The first would suggest an IF alignment error, while the second cold be due to an off-frequency oscillator crystal.

Thanks for the response. Yes it's consistently roughly 5 kHz below the designated frequency. For example if I want to tune in 11815 kHz I need to key in 11810 kHz to hear the signal (not perfect, still need tune up a bit with fine tuning dial) I don't know the exact amount of the frequency off as you may know the radio tuning is in a 5 kHz step.
So if IF alignment is the case I don't think I can handle the job. May need to find a technician to do the job...

On Wednesday, August 1, 2018 at 10:21:54 PM UTC-7, Fotopiggie wrote:
Thanks for the response. Yes it's consistently roughly
5 kHz below the designated frequency. For example if I
want to tune in 11815 kHz I need to key in 11810 kHz to
hear the signal (not perfect, still need tune up a bit
with fine tuning dial) I don't know the exact amount of
the frequency off as you may know the radio tuning is
in a 5 kHz step.
So if IF alignment is the case I don't think I can
handle the job. May need to find a technician to do the
job...
Was it like then it was new? If so, it may be a manufacturing error. IF filtering is often done with ceramic resonators, and if they used 450 kHz instead of 455 kHz (or vice versa), that could explain it. It is unlikely that it would have spontaneously shifted frequency. I tried to look at the circuit diagram that Frank cited, but my eyes are too old and the my monitor resolution is too poor for me to read it.

No idea if it's's like that while it was new. I got it from ebay some years ago but didn't play with it seriously until recently. FYI this is the correct manual:

http://diagramasde.com/diagramas/otr...e%20Manual.pdf

So is there a chance to fix it? Thanks



於 2018年8月2日星期四 UTC+8下�9時30分28秒寫�：
On Wednesday, August 1, 2018 at 10:21:54 PM UTC-7, Fotopiggie wrote:
Thanks for the response. Yes it's consistently roughly
5 kHz below the designated frequency. For example if I
want to tune in 11815 kHz I need to key in 11810 kHz to
hear the signal (not perfect, still need tune up a bit
with fine tuning dial) I don't know the exact amount of
the frequency off as you may know the radio tuning is
in a 5 kHz step.
So if IF alignment is the case I don't think I can
handle the job. May need to find a technician to do the
job...
Was it like then it was new? If so, it may be a manufacturing error. IF filtering is often done with ceramic resonators, and if they used 450 kHz instead of 455 kHz (or vice versa), that could explain it. It is unlikely that it would have spontaneously shifted frequency. I tried to look at the circuit diagram that Frank cited, but my eyes are too old and the my monitor resolution is too poor for me to read it.

On Friday, August 3, 2018 at 12:55:02 AM UTC-7, Fotopiggie wrote:
So is there a chance to fix it? Thanks
Probably not economically, at least in the US.

The schematic shows a 450 kHz ceramic filter, so my hypothesis might be right. If it was made by Murata, it will have some indication of the IF frequency, and if it says 455, then this is probably the reason. Murata filters are cheap (under US$10 at Mouser), but I don't know if they are compatible with yours. Or, you could cannibalize one from another 7600D if you can find a bad one.

Even if you found the right part, in the US the labor charges would be more than the radio is worth. Maybe you could find a sympathetic hobbyist...

Join the ICF 2010 group .)and ask
this question. There is a way I just can't recall it.
Chuck

Fotopiggie wrote:
No idea if it's's like that while it was new. I got it from ebay some years ago but didn't play with it seriously until recently. FYI this is the correct manual:

http://diagramasde.com/diagramas/otr...e%20Manual.pdf

So is there a chance to fix it? Thanks



於 2018年8月2日星期四 UTC+8下�9時30分28秒寫�：
On Wednesday, August 1, 2018 at 10:21:54 PM UTC-7, Fotopiggie wrote:
Thanks for the response. Yes it's consistently roughly
5 kHz below the designated frequency. For example if I
want to tune in 11815 kHz I need to key in 11810 kHz to
hear the signal (not perfect, still need tune up a bit
with fine tuning dial) I don't know the exact amount of
the frequency off as you may know the radio tuning is
in a 5 kHz step.
So if IF alignment is the case I don't think I can
handle the job. May need to find a technician to do the
job...
Was it like then it was new? If so, it may be a manufacturing error. IF filtering is often done with ceramic resonators, and if they used 450 kHz instead of 455 kHz (or vice versa), that could explain it. It is unlikely that it would have spontaneously shifted frequency. I tried to look at the circuit diagram that Frank cited, but my eyes are too old and the my monitor resolution is too poor for me to read it.

Thanks!

ka6uup於 2018年8月5日星期日 UTC+8下�9時09分13秒寫�：
Join the ICF 2010 group .)and ask
this question. There is a way I just can't recall it.
Chuck

Fotopiggie wrote:
No idea if it's's like that while it was new. I got it from ebay some years ago but didn't play with it seriously until recently. FYI this is the correct manual:

http://diagramasde.com/diagramas/otr...e%20Manual.pdf

So is there a chance to fix it? Thanks



於 2018年8月2日星期四 UTC+8下�9時30分28秒寫�：
On Wednesday, August 1, 2018 at 10:21:54 PM UTC-7, Fotopiggie wrote:
Thanks for the response. Yes it's consistently roughly
5 kHz below the designated frequency. For example if I
want to tune in 11815 kHz I need to key in 11810 kHz to
hear the signal (not perfect, still need tune up a bit
with fine tuning dial) I don't know the exact amount of
the frequency off as you may know the radio tuning is
in a 5 kHz step.
So if IF alignment is the case I don't think I can
handle the job. May need to find a technician to do the
job...
Was it like then it was new? If so, it may be a manufacturing error. IF filtering is often done with ceramic resonators, and if they used 450 kHz instead of 455 kHz (or vice versa), that could explain it. It is unlikely that it would have spontaneously shifted frequency. I tried to look at the circuit diagram that Frank cited, but my eyes are too old and the my monitor resolution is too poor for me to read it.