Marantz 3800 - Page 29

SYMPTOMS PROBABLE CAUSE
. Short in input circuit
. Open input circuit, Program Selector, Tape Monitor,
Mode, Volume or Balance Switch
3. Defective X10 amplifier
. Output circuit open or shorted
No signal output in any condition
No
. Shorted input circuit to phono amplifier
. Open input circuit
. Defective phono amplifier
. Phono amplifier output circuit open
. Short in phono amplifier output circuit
. Phono amplifier oscillating (VHF) because of open
(or shorted) feedback circuit through Program Selec-
tor Switch
No signal output in low level inputs
Ooahwhnrhd=
. Defective tone amplifier
2. Open tone amplifier output circuit
. Defective Tone or Loudness switch
No signal output with TONE in or LOUDNESS in
Low gain in low level inputs Defective phono amplifier
Low gain with TONE in or LOUDNESS in Defective tone amplifier
. X10 amplifier defective
. Excessive output loading
. Short in low filter switch circuit
High distortion in any condition
NO
=
. Defective phono amplifier
. Hum pickup in the input circuit
High distortion in low level inputs
Defective tone amplifier
High distortion with TONE in or LOUDNESS in
. Defective phono amplifier
. Open feedback circuit, Program Selector switch
. Input circuit open
. Input cable shield not grounded
Excessive noise in low level inputs
PWoON
. Defective X10 amplifier
. Input circuit cable shield not grounded
. Exces.ive power supply ripple (hum)
Excessive noise in high level inputs
N
Excessive noise with TONE in or LOUDNESS in Defective tone amplifier
. Open input circuit
. Open feedback circuit, program selector switch
. Grounds intermittent or broken
. Defective phono amplifier
Oscillation in low level inputs
PWN =
. Defective X10 amplifier
. Shorts in high or tow filter circuits
Oscillation in high level inputs
Table 2-2 Trouble Analysis ( continued }
2-14