Sharp AY-XP24PU Service Manual page 20

AY-XPC15PU
Problem Outdoor
symptom unit indi-
o
cation
(LED1)
{ { { { { Timer (Orange)
Indoor and Normal
{ { {
outdoor blinking
units oper- or OFF
ate.
{ { { { { Timer (Orange)
{ { {
{
{ { { { { Timer (Orange)
{ { {
{ {
*Remark
The malfunction No. is calculated using the following way.
Example)
Indoor unit lamp
Timer (orange)
Operation (Green)
Plasmacluster (blue)
IPM CHECK METHOD
1. Turn off the power.
2. Make sure that the electrolytic capacitor voltage is approx. 0 V.
3. Remove all connectors of the IPM PWB.
4. Measure the resistance between terminals using a tester.
Measuring points of terminals are shown in the figure below.
Analog tester
Normal Resistance
- +
TN
T U
TP
*(Few MΩ)
T V
T W
Indoor unit Malfunc-
tion No.
Lamp Main Sub
26
Operation (Green)
{ Plasmacluster(Blue)
Operation (Green)
Plasmacluster(Blue)
Operation (Green)
Plasmacluster(Blue)
oLamp
16 8 4 2 1
O O O O O
O O
O
Analog tester
- -
TU
∞ T V TN
T W
( * ) v a u l
IPM printed wiring board
TN
REMOVE
Content of diagnosis
Main Sub
1 Indoor unit Indoor unit room
room tem- temperature
perature thermistor
thermistor
2 Indoor unit Indoor unit pipe
pipe tem- temperature
perature thermistor
thermistor
3 Indoor unit Indoor unit valve
valve tem- temperature
perature thermistor
thermistor
Calculation Main
4+1=5 5
2
Normal Resistance
∞
(Few MΩ)
: e b y D i g i l a t e t t s r e
REMOVE
TP
REMOVE
TU
TV
TW
3 – 6
Check point
(1) Check connector of (1) Replace the ther-
thermistor for mistor.
secure installation.
(2) Check the tempera- (2) Replace the ther-
ture properties of mistor.
the thermistor.
(1) Check connector of (1) Replace the ther-
thermistor for mistor.
secure installation.
(2) Check the tempera- (2) Replace the ther-
ture properties of mistor.
the thermistor.
(1) Check connector of (1) Replace the ther-
thermistor for mistor.
secure installation.
(2) Check the tempera- (2) Replace the ther-
ture properties of mistor.
the thermistor.
Sub
2
Action