Marantz 4415 - SERVICING PROCEDURES; TEST EQUIPMENT REQUIRED FOR SERVICING; AM ALIGNMENT PROCEDURE

8.
TEST
EQUIPMENT
REQUIRED
FOR
SERVICING
Table
1
lists
the
test
equipment
required
for
servicing
the
Model
4415
Receiver.
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 Voitmeter
Variable Autotransformer
(0-140VAC, 10 amps)
Shorting Plug
Output Load
(8 ohms, 0.5% 100W)
Output Load
(4 ohms, 0.5% 100W)
Less than 0.3% distortion
Less than 0.3% distortion
Weston Model CVO-100P,
less than 0.02% residual dis-
tortion 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
(0-1 50VAC)
Powerstat, Model 116B
Use phono plug with 600
ohm across center pin and
shell.
Commercial Grade
Commercial Grade
Use
Signal source for AM align-
ment.
Used 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 trouble
shooting and ASO alignment.
Voltage 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 power
to amplifier.
Shorts amplifier input to elimi-
nate noise pickup.
Provides 8-ohm load for am-
plifier output termination.
Provides 4-ohm load for am-
plifier output termination.
Table 1 Test Equipment Required for Servicing
9.
AM
ALIGNMENT
PROCEDURE=
9.1
AM
IF
Alignment
1.
Connect
a
sweep
generator
to
the
test
point
(A)
or
J107
and
an
alignment
scope
to
the
test
point ®).
9.
Rotate
each
core
of
IF
transformer
L116
and
L117
symmetrical response.
9.2
AM
Frequency
Range
and
Tracking
Alignment
1.
Set
AM
signal
generator
to
525
KHz.
Turn
the
tuning
capacitor
fully
closed
(place
the
tuning
for maximum height and flat top
pointer
at
the
low
end.)
and
adjust
the
oscillator
coil
L115
for
maximum
audio
output.
ARE PNA ANS PALIT ND hee Cane MENS WE a THT cnn Sco wt Ease
int 08 gs WAAR TA IR ASE OE Bat om
Fk ae ON bb AG tn sw
|