Pioneer PDP-501MX Service Manual page 83

3. Diagnosis of Malfunctions when Power Down (PD) Occurs
TP NO.
ASSY Name
X DRIVE(A)ASSY
When K2609 is H
X DRIVE(B)ASSY
Y DRIVE(A)ASSY
When K3109 is H
Y DRIVE(B)ASSY
When the following
POWER SUPPLY
are L
MODULE
P12 Pin 5 (PD.XA)
Pin 7 (PD.XB)
P6 Pin 8 (PD.YA)
Pin 0 (PD YB)
Note) If PD occurs without +5V supplied to the PD terminal of the drive assembly, overload of the power supply or malfunction of the POWER
SUPPLY MOD. may be suspected. Turn OFF the large power ON/OFF switch SW1 of POWER SUPPLY MOD., and short-circuit Pins
1 to 3 of CN3305 of each assembly of Y DRIVE (A)/(B) so that only the small signal block can be checked.
+5V Generation Point Operating PD
D2604 anode VCP+12V over-current
D2703 anode (+) reset circuit over-
current
D3104 anode VCP+12V over-current
D3209 anode (–) reset circuit over-
current
D3320 anode (YA) VH150V over-current
D3310 anode (YB)
D3322 anode (YA) VH150V over-current
D3324 anode (YB)
PD only at small signal
block
(Large Power line off)
Note)
PD at the large power
block
V
CSP
V
SUS
V
OFS
V
RN
PDP-501MX, PDP-V501X
• Pulse module IC2610, IC2611 peripheral circuit
•
(+) reset circuit Q2702 peripheral circuit
•
Q2702G-S signal
•
X signal terminal K2611 (5V amplitude)
PR-U
• Pulse module IC3101, IC3106 peripheral circuit
•
Y FET-Q3206-Q3209 peripheral circuit
SUS_MSK
•
C FET-Q3005-Q3006 peripheral circuit
SP_MSK
•
Scan assembly internal bypass FET
Q7701, Q7702 peripheral circuit
• Y output FET Q3204 peripheral circuit
NR_D
• Y output FET Q3201 peripheral circuit
NR_U
•
Q3204 G-S control signal
•
Q3201 G-S control signal
•
Y signal terminal K3117
NR_D
• Y signal terminal K3118
NR_U
•
D-D converter circuit mis-operations
•
When short-circuited between VH150V and
GND
• Scan IC fault
•
D-D converter fault
•
When not short-circuited between VH150V and
GND
• VH over-current mode (BYPASS FET is
always ON)
•
BYPASS output FET short-circuited
•
Digital section BYPASS control signal fault
•
Control signal stuck
• VH over-current mode (Scan IC mis-
operations)
•
Scan IC fault
•
Scan IC control signal fault
• V 175V line fault
SUS
• When small signal block power overload
•
Fault of small signal block power supply of
assemblies
•
Fault of only the POWER SUPPLY MOD.
• When not small signal block power overload
•
Fault of the POWER SUPPLY MOD. when PD
occurs in the POWER SUPPLY MOD. alone
•
Fault of assembly when PD does not occur in
the POWER SUPPLY MODULE alone
• When large power block overload
• Fault of power supply of each drive assemblies
•
Fault of the POWER SUPPLY MOD.
•
When not large power block overload
+40V
•
Fault of the POWER SUPPLY MOD. when PD
+175V
occurs in the POWER SUPPLU MOD. alone
+150V
•
Drive circuit mis-operations when PD occurs
–190V
due to drive assembly operations
•
Drive control signal fault
• Pulse module IC input signal fault
Between SUS-B 4 and 6 of IC2610 (XA)
Between SUS-U 5 and 6 of IC2611 (XB)
Between SUS-D ! and @ of IC3101-1 (YA)
Between SUS-G * and ( of IC3106 (YA)
• Fault between FET and G of each output
Faulty Point
83