– 72 –
•
Check 5V (
±
0.5V), 12V and
@
5V
using test pin.
•
Check as follows to measure power voltage of upper
arm (U,V,W) and lower arm drive circuit:
a) U phase of upper arm
Apply
!
terminal of tester to pin
8
of PQ501
Apply
@
terminal of tester to pin
7
of PQ502
b) V phase of upper arm
Apply
!
terminal of tester to pin
8
of PQ501
Apply
@
terminal of tester to pin
7
of PQ502
c) W phase of upper arm
Apply
!
terminal of tester to pin
8
of PQ503
Apply
@
terminal of tester to pin
7
of PQ503
d) Lower arm
Apply
!
terminal of tester to pin
8
of PQ601
Apply
@
terminal of tester to pin
7
of PQ602
Test pin
DC voltmeter
or tester
For PQ501 — PQ503 and
PQ601 — PQ603, apply
!
terminal to pin
8
,
@
terminal
to pin
7
. If short-circuited
between pins, it could be
damaged.
When measuring drive
voltage, if short-circuited
between pins, it could be
damaged.
PQ601 603
PQ501 503
@
V
8
1
!
CAUTION
CAUTION
<Reference>
•
When power circuit for P.W.B. is estimated as abnormal:
(1) Check that power voltages of 5V, 12V on the control P.W.B., and also power voltage of upper arm
U, V and W and lower arm are specified values.
(2) Abnormal only when output of 5V voltage has decreased:
Regulator 1 is abnormal, short-circuited between 5V and 0V, or output too high.
(3) When 12V and 5V voltage are abnormal:
1
Mainly;
2
Fan, operation, power, or inrush current protective relays (short-circuit inside relay, etc.)
3
HIC abnormal
Regulator 1 abnormal, etc.
Primary side short-circuited.
When secondary side is short-circuited, primary side is normal because of overcurrent protective
device
Voltage rise when primary side is open, feed back system abnormal.
(4) When each phase of upper arm U, V, W or lower arm power is abnormal:
D61 - D65, RC61, RC62 or drive circuit is abnormal.
(5) When all voltages are abnormal:
Q210, ZD201, R205, etc. may be abnormal.
Be careful, if Q201 is abnormal, other parts such as power module, HIC, regulator could be defective.
Fig. 4 - 2
Be careful not to short-circuit by touching of
tester terminals, etc.
CAUTION
+
1V
-
1 . 5 V
(
(
+
1V
-
1 . 5 V
(
(
