grundig: 3035W/3D/USA (3035 W/3 D/USA);
grundig: 3035W/3D/USA (3035 W/3 D/USA);
Good morning gentlemen,
It is 9 am here in
I get sound when an audio signal is input to the phono pick up but no radio reception on any band AM or FM.
1 - Is there a convenient point to pick up audio from the radio sections? I want to determine if the problem is a switch or other.
Please note: This is very preliminary. I will be checking all DC voltages today. I realize there are many more strategies to troubleshooting.
2 - How close is the schematic from the German version to the
3 - In addition, I see there is a ferrite bar connected via dial cord to the treble tone control that moves in and out of a transformer. That is curious. How does that work?
I will report my additional finding from today's round of troubleshooting.
Paul
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Did you replace the ECH81 with another one? Did you replace the paper caps around the circuit? Lastly, how are the resistors in the circuit?
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3 - ferrite bar moving in a transformer
the moving ferrite bar in the (IF) transformer usually works as a IF bandwidth variation in parallel to the treble control
Best regards,
Robert Schmalstieg
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Good morning Gentlemen,
I have made good progress with the Grundig 3035. It turns out there were two bad tubes (three including the eye tube) and a shorted capacitor C47.
Capacitor C47 took out R17 (open) and C51 (short). Once replace the AM radio functioned. After that, I did a full re-capping and cold checked (ohmmeter) every resistor. It makes me feel confident of a high probability of success if the radio works just a little before re-capping.
I also retrofitted the rectifier bridge with 1n4007 diodes. What a surprise when I slid apart the bridge. All the little wafers of selenium came shooting out. I modified the contacts, drilled lead wire holes and installed 4 replacement diodes. I then set the line fuse for 125 volts, which I think brings the voltage close to specs. It schematic is very hard to read.
The power toggle switch is intermittent. I used contact cleaner to restore proper functionality. However, I do not trust that the switch will remain trouble free for long.
Q - Where can I find a replacement toggle switch with the specially formed toggle?
The tone controls have a red flag that moves behind clear notes in the dial glass. Curiously the Treble flag will not completely swing behind the last two lowest treble notes. The semi circle shaped red plastic simply will not reach behind the last two clear notes.
Q - Is this a design flaw? Or has some one replaced the dial scale or modified the mechanical flags?
I started the electronic alignment. But I do not have the proper text for the 3035 w/3d/USA. I am using the alignment for a 5077WE 5088WE chassis. There are some similarities. Enough to help me align the dial scale to the frequency and set the AM IF. Unfortunately, I fear that I may do more harm than good.
Q - Most importantly, would some one please post or send a copy of the proper alignment procedure? paul@ppinyot.com. English is preferred but German will do. My father has a German born friend that can translate.
After alignment, it is on to the speaker array to insure the tweeter is operational.
I will be posting some pictures of the radio and the rectifier bridge retrofit.
Thanks to all contributors.
Paul P.
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Alignment procedures
I shall be looking forward to your expanded efforts to restore the 3035W3D/USA. . . .especially since you were very convincing when you provided the following advice to the esteemed Grundig radio design engineer Mr Hans Knoll, early last year, as to methods used to align the 5088WE (see the attached advice) as below:
Hans,
I used both of your methods for adjusting R32 below:
Now my advice to you:
1. Inject an AM -Modulated Signal of 10,7 Mcs on G1 ECH81, the signal strengt should be for 4 to 6 Volts DC on C56 10uF Ratio Electrolyt. Adjust R 32 for minimum audible Mod. Frequency ( 400 to 1000 C/s) depents from your SG.
2. Or very simple, but good ( i to that offten) receive a weak FM Signal from Air, select one noisy signal (with much noise in background) Adjust R32 for minimum audible noise. Thats all! This procedure can used for all Sets Tube or Solid State. (Transistor with an Ratio)
Now my advice to you:
1. Inject an AM-Modulated Signal of 10,7 Mcs on G1 ECH81, the signal strengt should be for 4 to 6 Volts DC on C56 10uF Ratio Electrolyt. Adjust R 32 for minimum audible Mod. Frequency ( 400 to 1000 C/s) depents from your SG.
2. Or very simple, but good ( i to that offten) receive a weak FM Signal from Air, select one noisy signal (with much noise in background) Adjust R32 for minimum audible noise. Thats all! This procedure can used for all Sets Tube or Solid State. (Transistor with an Ratio)
With the assistance of a good eye tube and a decent ear, Methode 1 was the best for me and the avaiable FM "Noisy" stations. The control dipped quite easily and I was able to determin a minimum adjustment point rapidly.
I would imagine that the alignment differences would not be significantly more complex or radically different than those for the 5077 or 5088 chassis.
Respectfully,
Robert
GR: long lines corrected
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I perceive the "advice" to be that originally offered by Herr Knoll, now quoted, along with Mr. Pinyot's response stating which of the two offered methods from Herr Knoll he preferred to use.
Or, am I missing something?
Regards,
Dennis Daly
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sorry i am wrong.
A.M.
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Origonal
| Hello Gentlemen, I perceive the "advice" to be that originally offered by Herr Knoll, now quoted, along with Mr. Pinyot's response stating which of the two offered methods from Herr Knoll he preferred to use. Or, am I missing something? Regards, Dennis Daly |
|
 |
Reply,
Tuning in a weak station is the simplest to perform for that single adjustment. And it is quit effective. However, this adjustment is only a very small part of a whole alignment. There are five different IF style trasformers/coils mounted to the top of the chassis (three single wide square and two rectangular). Additionally there is a set of FM adjustments inside the metal coverd FM tuner section. And there are coils variable caps on each AM band under the switch assembly.
I hope to aquire the complete alignment instructions since there are more chassis mounted IF style transformers/coils on the 3035 than on the 5088. Properly adjusting those chassis mounted IF transformers is where the difficulty is for me.
Paul Pinyot.
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Gents,
This is the flat pack selenium diode rectifier bridge from the 3035. Once open it is simply a matter of trimming the dual contacts to a single contact, drilling two holes per contact and installing four diodes. I used tape and labeled the contacts to make diode installation a bit easier.
Paul.
Also see bottom of:
http://www.ppinyot.com/G/grundig.htm
Attachments:
- inspect diode (37 KB)
- Drill (58 KB)
- IM000113 (50 KB)
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Gentlemen,
This is the Electrostatic Tweeter. It did not output any appreciable audio. I disassembled the unit and found a corroded contact. The contact is pressed against the flexible membrane. This contact was cleaned of corrosion with sand paper, reassembled and tested. It produced much more sound after the cleaning. There is a wool like material that presses the membrane against the metal perforated screen. It was in excellent condition.
Also see: http://www.ppinyot.com/electrostatic_tweeter.htm#3035
Paul.
Attachments:
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