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454A fan question

[email protected] All Messages By This Member #152561 Hi, new member here. Hope this hasn't been covered before. Anyone know what the fan motor voltage is for the 454A? Mine is starting to make funny little noises. I have the service manual but it doesn't show the voltage and current. I can see from the schematic it's an AC motor. I'm thinking of replacing it with a small muffin fan when the time comes. I use this scope daily in my work so I want to keep it running a long time. Also have a 575 and a 7903. These Tek scopes were such hi quality! They were the standard others tried to live up to when I was a kid in school.
Robin_Birch Member Profile All Messages By This Member #152562 Check the serial number of your scope against the manual as I think that there are several types. On a positive note. Mine had seized so I dismantled it, cleaned the bearings by forcing iso propyl alcohol into the bearings followed by light oil until they were smooth. It then ran beautifully. A very nicely made motor. Robin toggle quoted message Show quoted text On 14 Nov 2018, at 15:50, k.kaplan@... wrote: Hi, new member here. Hope this hasn't been covered before. Anyone know what the fan motor voltage is for the 454A? Mine is starting to make funny little noises. I have the service manual but it doesn't show the voltage and current. I can see from the schematic it's an AC motor. I'm thinking of replacing it with a small muffin fan when the time comes. I use this scope daily in my work so I want to keep it running a long time. Also have a 575 and a 7903. These Tek scopes were such hi quality! They were the standard others tried to live up to when I was a kid in school.
Jack All Messages By This Member #152563 Hi...irrespective of the noises you could measure its voltage at its terminals. If you replace it, it should be with a fan which is similarly filtered and able to provide the volume and rate of air required. Have you tried cleaning and then lubricating its bearing surfaces with a drop of machine oil?......not with DW 40. -- Jack
Albert Otten All Messages By This Member #152567 My "tek-454a.pdf" shows 116 V rms, top-left of the diagram voltage between pins 17 and 19. Motor 147-0027-00 was also used in the 454, at USA line voltage. Albert toggle quoted message Show quoted text On Thu, Nov 15, 2018 at 10:16 AM, <k.kaplan@...> wrote: Hi, new member here. Hope this hasn't been covered before. Anyone know what the fan motor voltage is for the 454A? Mine is starting to make funny little noises. I have the service manual but it doesn't show the voltage and current. I can see from the schematic it's an AC motor. I'm thinking of replacing it with a small muffin fan when the time comes. I use this scope daily in my work so I want to keep it running a long time. Also have a 575 and a 7903. These Tek scopes were such hi quality! They were the standard others tried to live up to when I was a kid in school.
Dave Wise All Messages By This Member #152568 If it's a 120VAC induction motor and you don't feel like refurbishing the original, you can probably do better with a DC "computer fan". For my 453, I bought a 12V fan for a few dollars, and installed a regulator that uses the HV power supply input rail as input. It is 60mm x 15mm. I ground off the mounting ears on the outlet side so I could mount it recessed, which gets the blades away from the filter, which reduces noise and increases airflow. To my ears it sounds quieter. The fundamental and harmonics are easier to take. It also moves more air than the original. See Photo Album </g/TekScopes/album?id=12878> , titled "453-454 Tubeaxial Fan Retrofit", and message topic "453 fan bearings". HTH, Dave Wise ________________________________________ From: [email protected] <[email protected]> on behalf of Albert Otten <aodiversen@...> Sent: Thursday, November 15, 2018 8:29 AM To: [email protected] Subject: Re: [TekScopes] 454A fan question My "tek-454a.pdf" shows 116 V rms, top-left of the diagram voltage between pins 17 and 19. Motor 147-0027-00 was also used in the 454, at USA line voltage. Albert On Thu, Nov 15, 2018 at 10:16 AM, <k.kaplan@...> wrote: Hi, new member here. Hope this hasn't been covered before. Anyone know what the fan motor voltage is for the 454A? Mine is starting to make funny little noises. I have the service manual but it doesn't show the voltage and current. I can see from the schematic it's an AC motor. I'm thinking of replacing it with a small muffin fan when the time comes. I use this scope daily in my work so I want to keep it running a long time. Also have a 575 and a 7903. These Tek scopes were such hi quality! They were the standard others tried to live up to when I was a kid in school.
Jack Rubin #152573 Nicely done - it does bring new meaning to "surface mount technology"!
John Sykes All Messages By This Member #152590 I would recommend either lubricating or changing the bearings. The motor is a split-phase capacitor-run induction motor: Tek used several suppliers. Nominal voltage 115v but not too critical. A previous post on here gave the bearing details which I've reproduced below (valid for 453/454/454A) John *** R3ZZ is the NSK number for the bearing under discussion. Cross references are: Single shielded NSK = R3ZZ NTN = RA3ZZ Fafnir = 33KDD5 SKF = WY3/16ZZ KOYO = EE1SZZX MRC = R3FFM Dayton = 1ZGC1 Double shielded NTN = RA3LL/1E Dayton = 1ZDG1 Dimensions: Bore = 0.1875" O. D. = 0.500" Depth = 0.1960"

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