Removing Chassis From Cabinet Of Radiola; Part Iv-Making Replacements - RCA Radiola 21 Service Notes

The various assemblies and parts of Radiolas 21 and 22 are readily accessible and replacements can be
easily made. Figure 3 illustrates the receiver chassis and Figure:
1 the rear interior cabinet view of Radiola 22. The following procedure gives the correct method for removing the
various assemblies from their cabinets.

(1) REMOVING CHASSIS FROM CABINET OF RADIOLA 21

To remove the receiver chassis from the cabinet .of the Radiola 21, proceed as. follows:
(a) Release the local-distant switch a id the operating switch from their respective
escutcheon plates. This is best done by removing the wood screws that hold .-the escutcheon and then
releasing the switch from the escutcheon by twisting its mechanism with the hand. This eliminates the
possibility of marring the collar of the switches with pliers or other tools.
(b) Remove the four machine screws at the bottom of the cabinet that holds. the chassis in place.
(c) Remove the volume control and station selector knobs from their respective shafts by merely pulling
them off.
(d) The chassis may now be lifted clear of the cabinet and placed in a position convenient for work.
(2) REMOVING R-22 RECEIVER ASSEMBLY
To remove the receiver assembly of Radiola 22 proceed as follows:
(a) Release the operating switch and local distant switch by removing their escutcheons and releasing the
switch collar. Replace the escutcheons temporarily.
(b) Remove the station selector and volume control knobs.
(c) Release the antenna and ground leads and the battery cable. Remove the loudspeaker connections from
the pin jacks on the receiver assembly.
(d) Remove the four machine screws that hold the chassis to the shelf. It may now be lifted clear and placed
in a position convenient for work. After the completion of all repairing replace it in the reverse
manner of that used to' remove it.
(3) REMOVING R-22 REPRODUCER UNIT
To remove the R-22 reproducer unit proceed as follows:
(a) Release the two loudspeaker leads from the receiver chassis at the output pin' jacks.
(b) Remove the eight screws that hold the reproducer unit mounting felt to the baffle board. The unit
together with its felt mounting may be lifted clear and placed in a position convenient for work. After
all work is completed it should be replaced in the reverse manner of that used to remove it.
(4) REPLACING R.F. LINE-UP CONDENSERS
The correct procedure for replacing the R.F. line-up condensers is given in the Radiola 44 and 46 Service
Notes and should be followed when making a replacement of this kind.
PART IV—MAKING REPLACEMENTS
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