Question about Philips Magnavox 27MS343S 27" TV

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I have a Magnavox astrosonic Stereo console Model 1P3813.

The turntable does not work properly. How do you adjust the set screws and arm weight to proper specifications? Where can I Ifind a repair manual for this antique?
Thanks,
Rick

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Zenith is4041 record/ cassette player


There is a clip in the center of the turntable's spindle. Remove it and the turntable platter should lift up. That model of turntable is driven by a rubber surfaced idler wheel that is tightly held between the motor shaft and the inside of the turntable's rim by a spring.
Most likely problem(s):
1. The motor is seized. (Even a seized motor will hum, from the 60Hz vibration of its windings.) You should be able to spin it freely between your thumb and index finger, with no resistance. If not, you must totally disassemble it (easy job), clean out the bearing journals with alcohol, lubricate, and reassemble. If you decide just to oil it without cleaning out the bearings, it will quickly seize again.
2. The idler wheel is seized on its shaft. Same solution as 1.
3. The rubber surface of the idler wheel has become hard with age. Best solution for this is to replace it, if you can find one. Alternatively, there are various liquid chemicals around that can renew the surface of the rubber.
4. The pivot mechanism that allows the wheel to assume its proper position is seized. Same solution.
5. Any combination of the above, including all of them! :-)

While you're in there, look at the geared wheel that engages the teeth on the inside center of the turntable's platter. It will have a little "kicker" mechanism that is moved by the turntable's tone arm (part that holds the cartridge) as the tone arm nears the end of the record. This little mechanism is notorious for seizing, and should also be cleaned out and lubricated.
Cheers!

Aug 16, 2013 | Zenith Televison & Video

1 Answer

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Google the model number with "manual" or "specs" to see if you can locate info on the unit.

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To restore your television you will need to replace the eeprom. Let me tell you why! The stereo decoder and signal processor at one time were confused with the microprocessor. This corrupted the eeprom. Without the following information, repair is next to impossible. Fortunately the repair is near..so pay attention! Location of the eeprom is IC002 on the TV board. You will need to know the numbers on the IC 001 (the microprocessor) and the numbers on IC1001 (stereo decoder). This will determine which correct eeprom to replace. The reason I say this, is there are six different eeproms to choose from. Show this info to a TV tech if you cannot do this yourself. Thanks for asking and show a few a few hands of support.

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1 Answer

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I can tell you genericaly what the fault is. I have not worked on your particular model, or have the service manual for it.

It is not an adjustment. There are some electrolytic capacitors that typicaly go off value with age. These would be located in the horizontal scan amplifier area.

The set will have to be properly serviced in order to bring it back to normal operation. This is not something you can fix yourself.

Jerry G.

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2 Answers

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To enter the service menu (use the button on the set)turn on the tv, then turn it off, using remote enter 2, 7, 1, then mute with in 5 seconds. Then press 9 and select V-S, display chnages from V-S and V-P. Then use channel up and down to adjust. When down use the power on the set to turn it off.

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