Daiwa NS-660PA is dead - ModsAndRepairs Forum at eHam.net

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eHam.net Forum : ModsAndRepairs : Daiwa NS-660PA is dead

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Daiwa NS-660PA is dead	Reply
by KB5MP on October 10, 2009	Mail this to a friend!
I bought a Daiwa NS-660PA SWR/Power Meter at the Belton Hamfest last weekend. The guy looked me in the eye and said it worked great. I guess he was correct to use the past tense because it is completely dead for me here in the present. On the chance that I am being dense, does this thing require power to work? Any suggestions on an instruction sheet or tips on how to troubleshoot it?

RE: Daiwa NS-660PA is dead	Reply
by K4DPK on October 11, 2009	Mail this to a friend!
That is supposed to be a peak reading meter. If it really is, and I'm not sure because some of the "peak readers" only use capacitors to slow the meter movement and are nowhere near accurate, but true peak reading instruments require active devices and, therefore, power. It probably should work in the non-PEP mode without power, but I don't know for sure because I didn't find a schematic in a quick search. Phil C. Sr. k4dpk

RE: Daiwa NS-660PA is dead	Reply
by K7KBN on October 12, 2009	Mail this to a friend!
Feb 1991 QST has the complete review, comparing it with the Coaxial Dynamics and two other meters. Bottom line, it needs a 9V battery (or possibly an external source of 9-14 volts DC.) 73 Pat K7KBN

RE: Daiwa NS-660PA is dead	Reply
by WB2WIK on October 12, 2009	Mail this to a friend!
Try installing the battery. If that fails, try contacting the Daiwa factory. If you can figure out HOW to contact the Daiwa factory, let me know...I have absolutely no idea how to do that. WB2WIK/6

RE: Daiwa NS-660PA is dead	Reply
by KB5MP on October 12, 2009	Mail this to a friend!
Thanks everyone. I made a little progress but as is usually the case, the progress opened up a new can of worms. I could not find any sort of 9V connector inside or out so I put a wallwart 12V supply on it, hooked it up to my 2 meter rig and voila! It worked on the 30W/average scale. But would not read anything on the 300W scale (not to mention the 3KW scale). I moved it over to my HF rig and once again, nothing. The dial light came on but no meter deflection anywhere. So I moved it back to the 2 meter rig where it had worked on the 30W scale a moment before, and...nothing but a dial light. I think it is safe to say that I have moved from "dead" to "intermittent" and that is always progress. :) -Grady, KB5MP

RE: Daiwa NS-660PA is dead	Reply
by WB5JEO on October 13, 2009	Mail this to a friend!
"If you can figure out HOW to contact the Daiwa factory, let me know." Technical and Sales: hamradio@daiwa-industry.co.jp

RE: Daiwa NS-660PA is dead	Reply
by WB2WIK on October 13, 2009	Mail this to a friend!
WB5JEO: Yes, thanks, I had that address. Nobody replies, I've tried using it. I've also found on the "Ham Radio" website they don't list a factory address anywhere. However the "mother company" Daiwa-Musen, seems to have one: DAIWA Corporation 2-5-15, Yushima, Bunkyou-ku, Tokyo, Japan. I'm trying to close in on where they actually manufacture anything. The documentation that comes with the products (at least the ones I've had) doesn't have any address anywhere. I hope to eventually solve this mystery!

RE: Daiwa NS-660PA is dead	Reply
by K0BT on October 13, 2009	Mail this to a friend!
Grady, Generalization alert: Almost all of these meters use a pair of 1N34a type diodes as the detectors (my CN-410m does). Open it up and check them. The meter probably also uses an op-amp for the peak hold feature. It might be something common like an LM324. If all else fails, you may want to try the "shotgun" approach and just replace the active components. I may get flamed for suggesting it, but sometimes the simple solution gets you a working piece of equipment. Bob

RE: Daiwa NS-660PA is dead	Reply
by WB5JEO on October 14, 2009	Mail this to a friend!
Steve, On the principle of finding someone who knows someone who knows someone, I wonder if one of the retailers has a telephone or email contact. It might be in sales, but sale often has to talk to engineering to answer dealer questions. It's such an enormous corporation that you'd have to find someone pretty much focused on ham gear to have any idea who to talk to. It also looks like their North American radio products distributor is NCG, which I suspect is the contact the retailers have: NCG Companies Inc. 15036 Sierra Bonita Lane Chino, CA 91710 Toll Free: 800.962.2611 Phone: 909.393.6133 FAX: 909.393.6136 sales@natcommgroup.com

RE: Daiwa NS-660PA is dead	Reply
by WB2WIK on October 14, 2009	Mail this to a friend!
JEO: Yes, I agree. I really don't know how big the company is, but I suspect it's really not very big since they don't even have an English translated website except for a few items including the "Ham Radio" stuff. My "problem" with Daiwa as a supplier goes "way back." I own a CN-620B watt/SWR meter which is clearly labeled that it's good to 150 MHz and rated "2000W" power. I bought it new from a distributor (AES I think, at the time) a long time ago -- probably in 1980 or so. I put a kilowatt through it on 144 MHz and it burned up -- literally. Not just "stopped working" but burned up -- the PCB through line trace literally burned the board, leaving it completely charred. Investigating this over a long period of time, I could absolutely never find a "factory contact" of any sort, no matter who I asked. All I was trying to do was find an engineering level contact to speak with for a minute, but there just didn't seem to be any, anywhere. The instruction sheet that came with the unit had no factory address at all. I can find the CEO of IBM, GM, NEC, Toyota or almost any major company in ten seconds, and send him an e-mail, or call him on the phone if I wish. I was just astonished that Daiwa was so hard to make contact with, and evidently still is.

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