DRAKE L7 Instrukcja Operatora Pobierz pdf (Strona 27)

CHAPTER

5

MAINTENANCE

5-1.

SERVICE

DATA

Your

L

7

will be checked and aligned 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 unit for alignment or ser-

vice. Address your request for authorization to:

R.

L.

Drake Company

540

Richard Street

Miamisburg, OH

45342

ATl'N: Customer Service Department

Telephone: (Area Code

513) 8663211

CAUTION

DO NOT ship the

L

7

with the tubes installed. If

the tubes are in question remove them and re

pack them separately in their original shipping

containers or obtain new containers from

R.

L.

Drake Company at the

addresslisted above. The

R.

L.

Drake Company will not assume respon-

sibility if the transportation company refuses

to pay

a

damage claim due to improper packing

or lack

of

insurance.

5-2. PARTS ORDERING

Replacements for any of the components used in

the Amplifier or Power Supply may be ordered, at

a nominal

coqt, from the factory at the address

above.

Parts

orders should specify that the parts

are for the Amplifier or the Power Supply, the

serial number of the unit, schematic reference

designation of the part, and value, tolerance and

voltage rating, where applicable.

WARNING

DO NOT operate the

L

7

with

the covers

removed. DO

NOT

defeat the interlock

LETHAL VOLTAGE

is

present at various

points inside the amplifier when the interlock

is defeated.

Before disassembling or

making any adjust-

ments, perform these precautionary steps in

sequence:

1.

Disconnect the Power Supply from the

power source.

2.

Disconnect the AC Power connector from

the amplifier.

3.

Disconnect the High Voltage connector

from the amplifier.

4.

Reverse the above order to reassemble

the Amplifier.

5-3. AMPLIFIER DISASSEMBLY

The cabinet

is

secured by

6

screws,

3

on each side

of the unit. Remove the screws and

lift

off the

cabinet.

There are three easily removable plates on the

bottom of the amplifier chassis. The rear plate

(with vent slots) covers the

tube

sockets and relay

and

can

be removed by removing the

8

mounting

screws.

The plate behind the POWER and MODE con-

trols allows access to the input low pass filter and

the

120/240

volt filament transformer primary

winding jumpers.

It

is

held in place with five

screws.

Finally, the

small plate underneath the band-

switch conceals the input matching network. Un-

screw the two mounting screws to remove this

plate.

5-4. CLEANING

Since the Amplifier compartment is forced-air

cooled,

it

will

collect particles of dust which must

be removed periodically. When the fan blade

ao

cumlates

a

large amount of dust, the Amplifier

should

be

cleaned. The best way to clean the

Amplifier

is

to remove the cabinet and blow the

dust out with compressed air. If compressed

air

is

not available,

a

1

inch paint brush with soft

bristles may

be

used

to

brush the interior clean.

5-5. TUBE REPLACEMENT

If

it

is

neeessary

to

replace the tubes

in

theL

7,

use

the same brand and

typeas

the tubes removed or

it

may

be

necessary to retune the input coils as de

scribed in paragraph

510.

If one tube

is

replaced

its

replacement shouldbethe same brand and type

as the remaining

tube.

5-6. TEST EQUIPMENT

The following

list

of test equipment represents the

minimum required to test and align the L

7.

a. Ohmmeter

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