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300/ 400TS and 300/ 400S
3) If any of these voltages are not present or
are below a 10% tolerance, replace the
PCB3 (WK-5548). Refer to section 12.3.3.
5. 3 Ver i f i cat i on of t he C ool i ng
Fan, FA N 1, D r i ve C i r cui t r y
C A U TI O N
Bef or e per f or m i ng any por t i on of t he pr ocedur e
bel ow , m ake cer t ai n t he uni t i s pl aced i n t he i ni t i al
set up condi t i on as descr i bed in section 11.4.1
"Preparation".
_
1) Verify the condition of the cooling fan, FAN1,
using a DC voltmeter. (The capability of the
voltmeter should be more than 50VDC.) Using
a DC voltmeter, measure between PIN1 (Posi-
tive [+]) and PIN2 (Negative [-]) of CN11 on
PCB3 (WK-5548). The location of connector
CN11 of PCB3 is indicated in Figure 11-12.
When you measure the above voltage, do not
remove the connector. Conduct the measure-
ment while the connector plug and receptacle
are still connected.
Fi gur e11-12: Ver i f i cat i on of t he FAN1
11
A D VA N C ED TR O U B LESH O O TI N G
pin1
pin2
PCB3
CN11
2) Using the measurement taken above, follow
the chart below for possible failure modes.
FAN1
Status
Case 1 Rotating
Case 2 Rotating
Case 3 Inactive
Case 4 Inactive
Tabl e 11-3: Ver i f i cat i on of t he FAN1
At the time of a low output and standby,
fan rotation becomes slow, which makes
exact voltage measuring impossible.
When verifying the voltage, confirm that the
AC input voltage remain within the operating
range of the unit. (The AC input does not
drop below 180VAC).
11 – 13
Voltage
measurement.
Remedy
(PIN1-PIN2 of
CN11 on PCB3)
FAN1 drive circuit
DC 18
25V
is normal.
Replace PCB3.
Below DC 18V
Refer to section
12.3.3.
Replace PCB3.
Refer to section
12.3.3.
Perform
Below DC 18V
"Verification of the
Power Supply
Voltage".
Refer to section
11.5.2.
Replace the FAN1.
DC 18
25V
Refer to section
12.3.21.
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