Thank you very much for this Service Manual, it helped us a lot to repair the M-4318!
...BUT: The parts list is missing and the free parts katalog on web isn't complete, so now we don't know the part numbers of the defect parts :(
We had to build them out of a working machine, and need the numbers to reorder the missing parts now.
Complete original Service Manual in good (scan) quality!
Text excerpt from page 22 (click to view)
AH-A129E AU-A129E
CHARACTERISTIC OF TH1 & TH2 K
The room is not cooled. The compressor does not operate.
180 160 140
Push the button "TEST" on the indoor unit, and wait 3 minutes.
120 100 80
Using a meter, measure voltage at the terminals on the terminal board.
60 40 20 0 -10 0 10 20 Fig. 1
10�C 30K
30 40�C
Is there a voltage between terminal "N" and "1" of the terminal board the power supply voltage ?
NO
Replace the PWB ass'y with a new one. YES
Measure resistances of TH1 and TH2.
Are the resistances correct Fig. 1 ?
NO
YES
Replace the thermistor ass'y with a new one.
The control circuit is normal. The compressor may be defective. The running capacitor may be defective. Refrigerant may have leaked. The outdoor fan motor may be defective. The outdoor fan motor capacitor may be defective.
