Affiliated Retailers, Inc. AR-254MU Schematic

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Product Information:
Model:AR-254MU
Manufacturer:Affiliated Retailers, Inc. (Artone)

Schematics Content:

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DESCRIPTION

TYPE: Eight-tube, two-band, superheterodyne,

FREQUENCY RANGE: Standard Broadcast Band; 540 to 1620 kc. (Selector Switch at middle position).

Frequency Modulation Band; 88 to 108 megacycles (Selector Switch to right).

INTERMEDIATE FREQUENCY: Standard Broad cast Band; 455 kc.

Frequency Modulation Band: 10.7 mc.

FM ANTENNA INPUT IMPEDANCE: 75 ohms balanced,

POWER SUPPLY: a. c. only.

VOLTAGE RATING: 105-125 volts.

POWER CONSUMPTION: 60 watts at 117 volt power supply; 20 watts additional for record changer.

POWER OUTPUT: 3.2 watts maximum.

TUBE COMPLEMENT:

6BA6 - R, F. Amplifier (AM & FM)
12AT7 - Oscillator & Mixer (FM)
6BA6 - I. F. Amplifier (AM & FM)
6BA6 - 2nd 1. F. Amplifier (FM)
6T8 - Ratio Detector (FM) Diode Det, & AVC (AM) Audio Amp. (AM & FM)
6BE6 - Converter (AM)
7A5 - Audio Output
5Y3GT - Rectifier

DIAL BULB: Type 47, 6.3 volts,.15 amp.

ALIGNMENT PROCEDURE

This receiver has been aligned at the factory for best performance and no attempt should be made to realign it unless the proper test equipment is available.
1. Turn the tuning condenser to full mesh, against stop, and set the dial pointer to line up with the right hand vertical portion of the " M " in " AM " and " FM located to the left of 55 on the dial.
2. Set the tone control knob to the full treble position (extreme right).
3. For Amplitude Modulated signal readings, connect output meter across voice coil (3.2 ohms).
4. All Amplitude Modulated input signals are modulated 30 % at 400 cycles with the High side of the signal generator connected to receiver as indicated in the alignment chart. Connect the low side of signal generator to the receiver chassis.
5. All Frequence Modulated signals are modulated 30 % at 400 cycles. 30 % modulation is equal to a deviation of 22.5 kilocycles. Connect the Frequence Modulated signal generator as indicated in the alignment chart,

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6. Turn the volume control to maximum clockwise position and adjust signal generator output to produce a noticeable output meter reading. Keep signal generator output as low as possible to prevent AVC action in the receiver,
7. For F.M. alignment, the loop antenna must remain connected, or a suitable dummy antenna must be connected in its place (See F.M, Dummy Antenna diagram).

SOCKET VOLTAGE CHART

CHASSIS TOP VIEW SHOWING ALIGNMENT ADJUSTMENTS

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ALIGNMENT CHART

A. M. DUMMY ANTENNA

F. M. DUMMY ANTENNA

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ALIGNMENT NOTES

1. Connect two 100,000 ohm, 5 carbon resistors (part no. 39375-97) in series, from pin 2 of V5 to ground. Then, connect an electronic voltmeter (negative polarity) across these resistors. Adjust " E " of T5 for maximum meter reading.

2. With the two 100,000 ohm resistors still connected as explained in note 1, connect the electronic voltmeter from the center junction of the resistors to the junction of R26 and R29. Adjust " F " of T5 for zero volts, first using a high scale on the voltmeter and then the lowest scale to obtain close balance.

3. Connect the electronic voltmeter from pin 2 of V5 to ground. Then adjust " G " and " H " of T3 for maximum meter reading. Retouch " E of T5 for maximum meter reading.

4. With the voltmeter connected as for note 3, adjust " J and K of T1 for maximum meter reading.

5. Adjust turns on F.M. oscillator coil by spreading a part or squeezing together, as required to make the 98 megacycle signal fall on 98 megacycles on the dial. See F.M. Dummy Antenna diagram.

6. Rotate variable capacitor rotor plates slightly back and forth while adjusting " M " to obtain maximum meter reading. See F.M. Dummy Antenna diagram.

7. Adjust turns on R.F.coil until maximum meter reading is obtained. See F.M. Dummy Antenna diagram.

B. Adjust for maximum output. See A.M, Dummy Antenna diagram.

MEGACYCLES TO CHANNEL NUMBERS " FM " BAND

To find the frequency in megacycles for CHANNEL NUMBERS between those given above, add .2 mega cycles for every whole number added to the CHANNEL NUMBER; for example Channel 204 would be 88.7 megacycles and 251 would be 98.1 megacycles.

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SCHEMATIC DIAGRAM

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