Marantz 2245 - Page 12

10.
Test
Equipment
Required
for
Servicing
Table
1
lists
the
test
equipment
required
for
servicing
the
Model
2245
Receiver.
Manufacturer
and
Model
No.
Use
Signal source for AM_ align-
ment
AM Signal Generator
Teast
Loop
Used
with
AM
Signal
generator
|
Less
than
0.3%
distortion
Signal
source
for
FM_
align-
ment
FM Signal Generator
Less
than
0.3%
distortion
Stereo
separation
alignment
and
Trouble
Shooting
Stereo Modulator
Sinewave
and
squarewave
sig-
nal
source.
Weston Model CVO-100P, tess
than 0.02% residual distortion
is required,
Audio Oscillator
Waveform
analysis
and
trouble
shooting,
and
ASO
alignment.
High sensitivity with DC hori-
zontal and vertical amplifiers.
VTVM
With
AC, DC,
RF
range
{Circuit
Tester
AC
Wattmeter
Simpson,
Model
390
Oscilloscope
Voltage measurements
Trouble Shooting
Monitors primary power to
Amplifier.
Monitors amplifier output un-
der short circuit condition.
AC
Ammeter
Commercial
Grade
(1-10A)
Monitors potential of primary
power to amplifier.
Line
Voltmeter
Commercial!
Grade
(0-15VAC)
Adjusts level of primary power
to amplifier.
Variable
Autotransformer|
Powerstat,
Model
116B
(0-140VAC,
10
amps:)
Shorting
Plug
Use
phono
plug
with
600
ohm
across
center
pin
and
shell.
Shorts amplifier input to elimi.
nate noise pickup.
Output
Load
-
Commercial
Grade
Provides
8-ohm
load
for
ampli:
(8
ohms,
0.5%;
100W)
fier
output
termination.
Output
Load
Commmercial
Grade
Provides
4-ohm
load
for
ampli.
(4
ohms,
0.5%,
100W)
fier
output
termination.