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7. Test Equipment Required for Servicing
Table 1 lists the test equipment required for servicing the Model 2220 Reécewer.
Item
Manufacturer and Model No.
AM Signal Generator
Test Loop
FM Signal Generator
Stereo
Modulator
Audio Oscillator
Oscilloscope
VTVM
Circuit Tester
AC Wattmeter
AC Ammeter
Line Voltmeter
Variable Autotransform-
er (0O-140VAC, 10 amps.)
Shorting Plug
Output Load
(8 ohms, 0.5%, 100W)
Output Load
(4 ohms, 0.5%, 100W)
8. AM Alignment Procedure
AM IF Alignment
symmetrical response.
Less than 0.3% distortion
Less than 0.3% distortion
Weston Model CVO-100P, less
than 0.02%
residual distortion
is required.
High sensitivity with DC hori-
zontal and vertical amplifiers.
With AC, DC, RF range
Simpson, Model 390
Commercial Grade (1-10A)
Commercial Grade
(0-150VAC)
Powerstat, Model 116B
Use
phono
plug
with
600
ohm
across
center
pin and
shell.
a
Commercial Grade
Commercial Grade
AM Frequency Range and Tracking Alignment
Signal
source
for AM
align-
ment
Use with AM Signal generator
Signal
source
for FM align-
ment
Stereo Separation alignment
and
trouble
shooting
Sinewave and squarewave sig-
nal source.
Waveform analysis and Trou-
ble Shooting, and ASO align-
ment.
Voitage measurements.
Trouble Shooting
Monitors
primary
power
to
Amplifier.
Monitors amplifier output un-
der short circuit condition.
Monitors potential of primary
power to amplifier
Adjusts level of primary pow-
er to amplifier.
Shorts amplifier input to eli-
minate noise pickup.
ae
Provides 8-ohm
load for am-
plifier output termination.
Provides 4-ochm load for am-
plifier output termination.
adjust the trimming capacitor CA-2 for maximum audio output.
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