CHAPTER V
MAINTENANCE
5-1. SERVICE DATA.
We will check and align your receiver at the factory
for a nominal fee if it has not been tampered with.
Transportation charges are extra. Any necessary
repairs will be made on a time and material basis.
Please write or call the factory for authorization
before returning your receiver for alignment or
service. Address your request for authorization to:
R. L. Drake Company
540 Richard Street
Miamisburg, Ohio 45342
ATTN: Customer Service Department
Telephone: (Area Code 5 13) 866-3211
Code-A-Phone Service after
1630 Hours E.S.T.
5-2. MAINTENANCE.
WARNING
Disconnect the R--4C from the power
source before removing the covers. High
voltage which is present at several points
can cause a lethal electrical shock.
Careful consideration has been given in the design
of the R-4C to keeping maintenance problems to a
minimum. However, it is quite possible that some
problem will arise which cannot be solved 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 ex-
ternal connections, control settings, tubes substi-
tuted, serial number, etc.
5-3. COVER REMOVAL.
a. Remove the three top screws on each side of the
R-4C.
b. Remove top cover by first pulling up on the rear
and then on the front of the cabinet.
c. Remove the six bottom screws from the sides of
the R-4C.
d. Lift the R-4C chassis out of the-bottom cover.
5-4. TEST EQUIPMENT REQUIRED.
a. Stable RF signal generator with calibrated out-
put attenuator and a frequency range of 50 kHz
to 30 MHz.
b. Frequency counter or oscillator accurate to with-
in 50 Hz at 5.645 MHz.
c. VTVM with 11 megohm input impedance.
d. A 12.6 MH
Z accessory crystal for operation of
the 1.5 through 2.0 MHz segment, if this band is
to be aligned.
An accessory crystal for reception of the WWV
standard frequency transmission that is most
reliably received in your area.
A scale with
l/32
inch divisions.
Two 10 K
l/2
W resistors.
5-5. TROUBLESHOOTING.
The R-4C has been designed so that tubes can be
replaced without need for realignment. The best
method of finding defective tubes is by direct sub-
stitution. Do not rely too heavily on a tube checker.
The voltage and resistance charts, tables 5-l and
5-2 should be valuable in isolating minor problems.
However, no attempt should be made to service the
R-4C unless you are thoroughly familiar with
electronic circuitry and servicing technique. Care
should be taken not to disturb the lead dress in the
R-4C. It is critical in several circuits.
5-6. ALIGNMENT INSTRUCTIONS.
Turn receiver on and adjust for SSB reception.
5-1
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