Hitachi RAS-H(V)RNME-AF Service Manual page 315

11 Servicing
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Removing inverter components
D A N G E R
• Do not touch the electrical parts when LED201 (Red) on the PCB2 is lit to prevent from an electrical shock.
• When replacing the transistor module (IPM) and diode module (DM) on heat radiation fin, slightly apply the
heat conducting silicon grease (Manufacture: Shin-Etsu Chemical Co., Ltd, Product No.: G-746) over the fin
contact surface.
• Identify the terminal numbers with mark band. When reassembling, the terminals have to be connected to the
correct numbers . If incorrectly connected, malfunctions or damages will occur.
• Correctly insert two wires of U and V phases for the power cable of inverter compressor into the current sen-
sor, CTU and CTV on PCB2. Connect Phase U power cable with the current sensor Phase U (CTU) and Phase
V power line with current sensor Phase V (CTV). If connected incorrectly, malfunction or electrical component
damage will occur.
• When mounting PCB and the sheet metal part for PCB, pay attention not to clamp the electrical wiring together.
• Screws, bushes and collars are used for fixing inverter PCB. Check to ensure that the bushes and collars are
used for PCB remounting. If not used, it may cause malfunction.
• In case of replacing control PCB, set all the dip switches as the same position before replacing. If not, mal-
function may occur. Refer to the manual attached with the service PCB.
• Do not apply strong force to the electric components and PCBs to avoid damage.
• Do NOT touch the electrical components when the LED201 (Red) is ON to avoid electrical shock.
Remove the service cover according to the section
in this chapter.
ving service cover
Open the P-mounting plate by rotating 90 degrees to the left
according to the section Opening electrical box (P-Mounting
Plate) in this chapter.
Removing the PCB2
Check to ensure that the LED201 (Red) of the PCB2 is OFF.
After removing the three (3) M3 fixing screws, remove the
bushes and the collars from the PCB2. When reassembling
the components, attach those bushes and collars.
No.
1 Middle part of holder
2 Holder
3 Collar
4 PCB3
5 Bush
6 Screw (M3)
7 PCB
N O T E
• Identify the terminal numbers with mark band. When reassembling, the terminals have to be connected to the
correct numbers . If incorrectly connected, malfunctions or damages will occur.
• Check to ensure that the electrical wires will not be caught between the assembled electrical components and
the mounting plates when the PCB2 is reassembled.
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SMGB0070 rev. 1 - 08/2011
Remo-
Part
1
7
6 5
2
3
11
4