Pioneer VSX-4000 Service Manual page 44

13.3 SURROUND DOES NOT EMIT. (ONLY VSX-5000(BK)).
(Turn ON the surround
SW on the rear panel.)
Are all in surround | YES
mode?
NO
Is the control signal
(J6: STUDIO,
STADIUM, DOLBY),
to which the surround
mode selection IC
(1C707: TC4066) is
applicable, normal?
YES
a
mode?
STADIUM
Rch w Lch DOLBY
Defective surround
selection IC (IC707:
TC4066).
Defective DOLBY IC
(1C706: LA2730).
Defective the circuit
from the microcom-
puter IC (C512:
PD3068)up to J6
pin within the small
signal assembly
(AWZ1094).
40
Defective the
speaker output
circuit from the
Surround assembly
(AWZ1096) up to the
AF video assembly
(AWZ1097).
Does the power YES
meter within the LDC
indicator operate?
NO
Is the fuse FU3 and
FU4 of the secondary
side of the
transformer (T1)
blown out?
YES
Is the DC potential of
pin 1 (Output) of the
power IC (IC709 and
1C710: 4PC1188H)
within the surround
assembly
(AWZ1096) OV?
Defective the power
IC (IC709 andIC710
uPC1188H) within
the surround assem-
bly (AWZ1096).
Is the DC potential of
pin 4 (Muting) of the
power IC (1C709 and
10710) 6V?
YES
Is the output pin of YES Defective the input
the surround PRE Circuit up to the
CUT normal? power IC (IC709).
Is the input level of
the volume IC (1C708:
CX-7978) within the P F
Defective periphe
surround assembly NES of the eclgae ic
(AWZ1096) normal? (1C708).
Are STUDIO,
STADIUM and
DOLBY of the control
signal (J6) of the
surround selection
IC (1C707: TC4066)
normal?
YES
Defective peripheries
of Q705 to Q707
(RN2203), I1C707
(TC4066) or 1C701
(M5218PF).