Samsung AM160FNBFEB/EU, Руководство по обслуживанию

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T ro u b l eshooting
4-7 2 S ams u ng El ectronics
4-4- 2 8 C o mmun i c atio n E rror b et w ee n MCU a n d O u tdoor Un it a f ter T ra ck i ng is C o mpl eted
t$PNNVOJDBUJPOFSSPSCFUXFFOJOEPPSBOEPVUEPPSVOJUTBOETFUVQFSSPSPGJOEPPSVOJUJOTUBMMBUJPORVBOUJUZ
set u p switch
Judgment Method
Special Cause
t0VUEPPSVOJUJTVOBCMFUPDPNNVOJDBUFGPSUXPPSNPSFNJOVUFTEVSJOHPQFSBUJPO OPSFDFQUJPOPGSFMPDBUJPO
Outdoor Unit Display
1 . I nspection Method
Indoor Unit Display
-
Y es
Press the P CB reset ke y (K 3) of the o u tdoor u nit
and check the disp l a y mod ul e.
I s the v o l tage between the 2 cab l es a
s qu are wa v e with D C±0 . 7V or more ?
I s there no M CU response at a ll on the
disp l a y mod ul e d u ring the tracking ?
Remo v e the comm u nication cab l e which
connects the o u tdoor u nit to the M CU, and meas u re
the 2 cab l es of the o u tdoor u nit with a scope.
C onnect the comm u nication cab l e which connects the
o u tdoor u nit to the M CU again , remo v e a ll comm u nication
connectors from the M CU P CB . C onnect each u nit one b y one ,
and find the M CU which interferes with comm u nication to
check and change the M CU P CB .
A fter two min u tes , find the M CU which disp l a y s
the comm u nication error and check if the P CB address
settings are o v er l apped. (A comm u nication error occ u rs
if the indoor u nit addresses are o v er l apped.)
- I n this case , a comm u nication error wi ll occ u r in e v er y
M CU ( two or more u nits) with the address incorrect ly set.
I nspect the comm u nication cab l e
and the connector of the o u tdoor P CB
and then change the P CB .
0 . 7V
0 . 7V
Good
Defective
I f there is no pec ul iarit y in the address , check
comm u nication and then change the M CU P CB .
Y es
No
No
❈
Essential Requirements before Changing PCB in Case of Communication Error: Refer to p.4-80