2C9-2
1-5-19
C6400
Zero-crossing signal problem
The engine PCB does not detect the
zero-crossing signal for the time speci-
fied below.
At power-on: 3 s
Others: 5 s
Poor contact in the
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective power
supply PCB.
Check if the zero-crossing signal is output
from CN2-5 on the power supply PCB. If not,
replace the power supply PCB.
Defective engine
PCB.
Replace the engine PCB if C640 is detected
while CN2-5 on the power supply PCB out-
puts the zero-crossing signal.
C7800
Broken external temperature ther-
mistor
The input voltage is 0.5 V or less.
Poor contact in the
humidity sensor
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective humidity
sensor.
Replace the drawer PCB and check for cor-
rect operation.
C7810
Short-circuited external temperature
thermistor
The input voltage is 4.5 V or more.
Poor contact in the
humidity sensor
connector termi-
nals.
Reinsert the connector. Also check for conti-
nuity within the connector cable. If none,
remedy or replace the cable.
Defective humidity
sensor.
Replace the drawer PCB and check for cor-
rect operation.
Code
Contents
Remarks
Causes
Check procedures/corrective measures
“A” is displayed on the operation panel.
Summary of Contents for CS-1620
Page 1: ...SERVICE MANUAL Published in June 05 2C970946 Revision 6 CS 1620 2020...
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