Marantz 2270 - Test Equipment Required for Servicing

10. Test Equipment Required for Servicing
Table 1 lists the test equipment required for servicing the Model 2270 Receiver.
Manufacturer and Model No.
AM Signal Generator Signal source for AM _ align-
ment
Test Loop Used with AM Signal generator
FM Signal Generator Less than 0.3% distortion Signal source for FM _ align-
ment
Stereo Modulator Less than 0.3% distortion Stereo separation alignment
and trouble shooting
Audio Oscillator Weston Mode! CVO-100P, less
than 0,02% residual distortion
is required.
High sensitivity with DC hori-
zontal and vertical amplifiers.
With AC, DC, RF range
Sinewave and squarewave sig-
nal source.
Waveform analysis and trouble
shooting, and ASO alignment.
Voltage measurements.
Trouble Shooting
AC Wattmeter Simpson, Model 390 Monitors primary power to
Amplifier.
AC Ammeter Commercial Grade (1-10A) Monitors amplifier output ur-
der short circuit condition.
Line Voltmeter Commercial! Grade (0-150VAC)} Monitors potential of primary
power to amplifier.
Variable Autotransformer | Powerstat, Model 116B
(0-140VAC, 10 amps.)
Shorting Plug
Adjusts level of primary power
to amplifier.
Use phono plug with 600 ohm
across center pin and shell.
Shorts amplifier input to elim:
nate noise pickup.
Output Load Commercial Grade
(8 ohms, 0.5%, 100W)
Output Load
(4 ohms, 0.5%, 100W)
Provides 8-ohm load for ampli
fier output termination.
Commercial Grade Provides 4-ohm load for ampl-
fier output termination.