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Drive
System
CircuitSon/all*
CentrifugesTable
4-10.
Troubleshooting
Chart,
Automatic
RateController.
Sheet
1
of
4Remove
power. Remove terminalsfrom
CR400 and CR401 and
checkdiodes.
If diodes are
faulty,replace
diodes or
PC-50155YESCheck
fuses F404 and
F406Blown?NONOCheck
for 11 5 V ac between terminals1
and 4 on T404 Is voltage
present?YESReplace
T404NORemove
power Check continuitybetween
T404-1 and TB20)-6
andbetween
T401-4 and
TB201-2Repair
or replace wires
asrequired.4-24PROBLEM:
Rotor does not turn in SLOW
modeonlySystem
Conditions:1.
SLOW switch ON2
TIMER ON3
"SPEED" control set to more than 1000 rev/min.4
DOOR closed5.
START switch ON (START lamp lit).6.
RATE switch at
maximumCheck
tor 4 V dc
betweenterminal
707 on PC-50155and
gnd. Is
voltagepresent?YESNOCheck
for 25 V dc
betweenterminal
702 on PC-50155and
gnd Is
voltagepresent?YESNOCheck
for 25-30 V ac
acrossCR400.
ts voltage
present?YESCheck
for 25 V ac
betweenterminals
709 and 711on
PC-50155 Is
voltagepresent?YESNOReplace
CR400Jumper
CR401 and check
for25
V dc between terminal702
and gnd Is
voltagepresent?YESNOMake
visual check of
K407contacts
Are
contactsclosed?YESNOCheck
for 12 V dc
betweencathode
(band end) of CR11and
gnd. Is voltage
present?YESNORemove
power.
Checkcontinuity
of 12 V line
andbetween
P109-11 and
P106-4With
SLOW switch
closed,check
continuity
betweenJ106-3
and-1106-4,
thenfrom
P106-3 and
J109-4Repair
or replace wiresas
requiredSecondary
brush
springtension
too light.
Seepara
6-7 or
6-8.0401.
R401, or R110 may
beopen.
Check for 4 V
dcbetween
wire 710 and gndIs
voltage
present?YESRemove
power. Remove
lugsfrom
R401 terminals and checkfor
continuity of R401,
Ifcontinuous,
remove wire
lugs702,
707, and 710 and
checkcontinuity
of 0401
junctions.NOCheck
for 4 V dc
betweenR110-3
and gnd.
Isvoltage
present?Replace
PC-50155.YESCheck
for 4 V dc betweenR401
wiper and gnd.Is
voltage
present?NORemove
power DisconnectP/J
108 and check
continuitybetween
P10B-2 and 3,
Ifopen,
replace R401,
Ifcontinuous,
replace
PC-50155.Replace
CR401Drive
motor secondary
brushspring
tension too light
orspring
broken Repair
orreplace
brush
springReplace
PC-50155.
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