V I
SERVICE DATA
We will check and factory align your R-4A for a nominal fee of $10 .OO plus
transportation charges if the set has not been tampered with. If repairs
are necessary, an additional charge will be made. Units that have been
tampered with or misaligned, will be repaired on a time and material basis
only.
A.
Removinq Top Cover
1. Remove the three top screws on each side of the R-4A.
2.
Remove cover by first pulling up on the rear and then on the
front of the cabinet.
B. Removinq Bottom Cover
1. Remove the six bottom screws from the sides of the R-4A
2. Lift R-4A chassis out of bottom cover.
c
Tube Replacement
In general, most trouble encountered in radio equipment of good design
is due to tube failure. The R-4A has been designed so that tube replace-
ment can be done without need for realignment. The best method of
finding defective tubes is direct substitution. It is best not to rely too
heavily on a tube checker.
D. Troubleshooting
Careful consideration has been given in the design of the R-4A to keep
maintenance problems to a minimum. However, it is quite possible
that some problem will arise which cannot be cured by tube substitution.
If this occurs, we suggest that you either return the unit to your dealer,
or write direct to our Service Department, describing your problem in
detail. Include full information concerning external connections, control
settings, tubes substituted, etc.
DO NOT RETURN EQUIPMENT TO THE FACTORY WITHOUT PRIOR
AUTHORIZATION.
The voltage and resistance charts which follow should be valuable in
isolating minor problems. However, no attempt should be made to
service the R-4A unless you are thoroughly familiar with electronic
circuitry and servicing technique.
CARE SHOULD BE TAKEN NOT TO DISTURB THE LEAD DRESS IN THE
R-4A SINCE SEVERAL CIRCUITS ARE QUITE CRITICAL IN THIS REGARD!
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