Pioneer VSX-4000 Service Manual page 45

13.4.1 DYNAMIC EXPANDER EMITS NO SOUND. (ONLY VSX-5000(BK)).
Defective
periphery of dynamic
expander IC (IC802
and IC803: M5218)
Dynamic expander
emits no sound.
Does the expander
output of J5 (Lch:
No.7 and Rch: No.3)
within the surround
assembly (AWZ1096)
emit?
Is the signal coming
to the expander input
(Lch: No.9 and Rch:
No.34) of the preamp | NO
IC (IC502: CX-789)
within the small
signal assembly
(AWZ1094)?
Defective course from
surround assembly
(AWZ1096) to
preamp IC (1C502)
input within small
signal assmbly
(AWZ1094).
Defective periphery
of preamp IC (1C502).
13.4.2 STEREO WIDE EMITS NO SOUND. (ONLY VSX-4000(BK)).
Defective STEREO
WIDE IC (1C507).
STEREO WIDE emits
no sound.
!s signal coming to
the output pin (Lch:
No.1 and Rch: No.7)
of STEREO WIDE IC
(1C507: M5218)
within zmall signal
assembly
(AWZ1094)?
Is the control signal
of STEREO WIDE
selection IC (C508:
MPD406€) normal?
Defective periphery
of Q506 and 0507
(RN2201).
Defective STEREO
WIDE selection IC
(1C508).
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