Pioneer FX-K99DK WG Service Manual page 81

TIS of microcomputers
PD4050B #50 (Acc): Acc +B circuit faulty
PD4022B, PD4046B
RESET circuit fault
(FX-T8) #3 (RESET):
"
System clock generator circuit faulty
PD4022B, PD4046B (FX-18)
#9 (CL2): Normal
PD4050B, ——
PD4022B, PD4046B (FX-T8)
SCK circuit faulty
RESET circuit faulty
'D4050B,
PD4022B, PD4046B (FX-T8)
~ ~ When CLEAR (S23)
is depressed, eye of
— ne Se
every IC: Normal
initial reset circuit faulty
D31 (MA3062) [Control Unit]: Open
Q34 (2SD601) [Control Unit}: Open
Q33 (2SD601) [Control Unit]: Short
Acc +B Line: Cold soldering/open
Q19 (2SD601) [Control Unit]: Short
Q20 (2SD601) [Control Unit]: Open
D15 (MA3043) [Control Unit]: Open
D19 (1S2473VH) (FX-T8}: Short
Initial reset circuit (D15 — Q20): Cold soidering/open
R88, C82 or PD4046B [FX-T8] (Generator for PD4046B): Cold soldering/open
R80 [Control Unit]: Cold soidering/open
Timing clock line: Cold soldering/open
PD4022B #37 (Tout): No signal
PD4050B: faulty
D13-1, D13-2 (MA153) [Control Unit]: Short
D16, 017 (1S2473VH) [FX-18]: Short
SCK line: Pattern — Cold soldering/open. Connectors — Poor contact
PD4050B, PD4022B, PD4046B [FX-T8]: faulty
D18 (1S2473VH) [FX-18]: Short
RESET Line: Pattern — Coid soldering/open. Connector — Poor contact
PD4050B, PD4022B, PD4046A [FX-T8]: faulty
f
D14, D15 (1S2473VH) [Control Unit]: Short
Serial data line: Pattern — Cold soldering/open. Connectors — Poor contact.
PD4050B, PD4022A, PD4046B: fauity
D14 (MA151A) [Control Unit}: Short
C25, C26 [Control Unit]: Cold soldering/open.