Marantz 3600 - Trouble Analysis

TROUBLE ANALYSIS
This section is included to assist in locating
troubles that may be difficult to isolate. Normal
troubleshooting techniques (point-to-point signal
_ tracing and oscilloscope analysis) are assumed in
isolating problems.
NOTE: Performance verification is necessary
following any repair.
No primary power consumption
Excessive primary power consumption
No signal output both channels
No signal output in any condition
No signal output in low level inputs
No signal output with TONE in or LOUDNESS in
High distortion in any condition
SYMPTOMS
PROBABLE
CAUSE
. Open A.C. input circuit, line cord, fuse, power
NO «=
=
. Power supply circuit defective.
. Short.in A.C. input circuit
. Short in A.C. secondary circuit, pilot lamp circuit,
. Short in input circuit
. Open input circuit, Program Selector, Tape Mon-
. Defective X10 amplifier and/or filter amplifier
. Output circuit open or shorted.
. Shorted input circuit to phono amplifier
. Defective phono amplifier
. Phono amplifier output circuit open
. Short in phono amplifier output circuit
. Phono amplifier oscillating (VHF) because of open
. Defective tone amplifier
. Open tone amplifier output circuit
. Defective Tone or Loudness switch.
Low gain in low level inputs Defective phono amplifier.
Low gain with TONE in Defective tone amplifier.
1.
2.
3. Filter amplifier defective.
Table 2. lists possible symptoms and causes if a
Model 3600 malfunctions. We do not attempt to
point up all potential problems and their remedies
since the service technician is capable of recogniz-
ing most. We attempt to aid the service technician
in isolating problems from the unit level down to
a detail part.
All references in this section will be made to
Figures 1, 2, and 3.
switch or transformer
or power supply.
No D.C. supply voltage to amplifiers, +Vcc,
—Vcc or neither, caused by broken supply lines,
defective power supply lines or defective power
transformer.
itor, Mode, Volume or Balance Switch
Open input circuit
(or shorted) feedback circuit through Program
Selector Switch.
X10 amplifier defective
Excessive output loading
Table 2. Trouble Analysis
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