Delco Radio Corp. 3026 Schematic

Delco Radio Corp. 3026

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Product Information:
Manufacturer:Delco Radio Corp.

Schematics Content

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These numbers refer to terminal numbers on the plug and receptacle

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For sets with serial numbers below 1400

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Bottom of Chassis
For Sets with Serial Numbers above 1400

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Remove the control drive cable from the rear of control unit.

Remove the control unit from the dash. Remove the top of the control unit, and the escutcheon plate.

Remove the stop pin from the selector drive shaft and loosen the two set screws in the cable windlass and the set screws in the selector shaft collar. Then push the selector drive shaft to the rear far enough to remove the windlass and cable assembly.

Hold the new windlass and cable, with the end containing the set screws in the left hand, and wind one complete turn of the short end of the cable around the windlass, in a clockwise direction, winding the cable in the groove away from the set screws.

Then wind three and one half turns of the long end of the cable around the windlass in a counter-clockwise direction, winding the cable in the groove toward the set screws.

Slip the cable clamp, Tool No. 1001, over the windlass to hold the cable in place.

Place the windlass and cable in position with the set screws to the rear and push the selector drive shaft forward into position through the windlass. The long end of the cable should lead away from the windlass at the bottom. The short end of the cable should lead away from the windlass at the top.

Pull the long end of the cable under the small idler pulley near the windlass and around the larger idler pulley from bottom to top. Hook the spring on the loop at the end of the long section of the cable then load the cable through the slot in the face of the selector dial drum and hook the free end of the spring over the ear in the drum, nearest the 150 mark.

Lead the short end of the cable once around the outside of the selector drum in a counter-clockwise direction and through the slot in the face of the drum. Hook the loop at the end of the cable over the ear in the drum nearest the 150 mark

NOTE: On a number of sets of early production, the two ends of the cable are connected by the cable spring. The selector drum in this case has two notches and the cable is wound around the drum with the spring in the position shown in Figure 8

If it should be necessary to replace either the windlass and cable assembly or the dial and drum assembly described above, both parts should be replaced by the later type as listed in the part section of this manual.

Be sure that four selector shaft stop washers and four plain washers are in position on the shaft. These washers should be arranged alternately with one plain washer against the rear bearing.

Replace the selector shaft stop pin, and with the windlass loose on the shaft, turn the shaft as far as it will go in a clockwise direction.

Hold the escutcheon plate in place on the front of the control unit and turn the selector dial until the last line beyond the 150 mark is lined up with the indicating pointers.

Place the windlass close enough to the front bearing to allow approximately 1/64" end play and tighten the two set screws in this position.

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Volume Control on Max. "B" Battery Voltage 180

* Do not attempt to take readings on the type 47 (Pentode) tube unless your set analyzer is equipped to test sets using this type of tube, Otherwise, readings taken at the 47 80ckets will be misleading. A: pantode used in Models 2027-6 and 2029 - A in place of'47 pentode output tubes.

NOTE: It should be noted that readings obtained with different get analyzers will vary with battery voltage and with different tubes. The read ins shorn, therefore, are only average readings. For this reason, each service mn should compile a chart similar to the one illustrated, using his own set analyzer with a set, and batteries that are known to be operating properly.

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MODELS 2027 - A AND 2029 - A
In order to re-operate the 2027 or 2029 chassis to the new 2027 - A or 2029 - A, there are three distinct operations which are as follows:
1. Change Filament leads which are connected in series, for use with the 247 tube, to parallel connections.

2. Insert the Black tubular 1 - OHM Resistor in the positive lead. This does not necessitate moving the resistor,

3. Conneot, a. 01 Mfd. condenser from the plate terminal on one pentode socket to ground.

The choke coils, which were mounted on the 2027 - A and 2029 - A sets received from the factory, are not necessary in making this change.