7. REPLACEMENT OF SERVICE P.C. BOARD

7-1. Indoort Unit

<Note: when replacing the P.C. board for indoor unit servicing>

The nonvolatile memory (hereafter called EEPROM, IC10) on the indoor unit P.C. board before replacement includes the model specific type information and capacity codes as the factory-set value and the important setting data which have been automatically or manually set when the indoor unit is installed, such as system/indoor/group addresses, high ceiling select setting, etc.

When replacing the P.C. board for indoor unit servicing, follow the procedures below.

After replacement completes, confirm whether the settings are correct by checking the indoor unit No., Group master unit / sub unit settings and perform the cooling cycle confirmation through the trial operation.

<Replacement procedures>

CASE 1

Before replacement, the indoor unit can be turned on and the setting data can be read out by wired remote control operation.

EEPROM data read out [1]

ò

Replacement of P.C. board for Indoor unit servicing and power on [2]

ò

Writing the read out EEPROM data [3]

ò

Power reset

(for all indoor units connected to the remote control when the group operation control is performed.)

CASE 2

Before replacement, the indoor unit cannot be turned on or the wired remote controller operation is impossible due to trouble of the power supply circuit to the remote controller. (Defective P.C. board)

Replacement of EEPROM

Remove EEPROM installed on the P.C. board before replacement

and then replace it with EEPROM of the service P.C. board.

ò

Replacement & power ON for service P.C. board [2]

ò

Read-out of EEPROM data [1]

If reading-out is impossible, proceed to CASE 3.

ò

Replacement of EEPROM

Replace EEPROM again. (Set the original EEPROM to the service P.C. board.)

ò

Replacement & power ON for service P.C. board [2]

ò

Writing-in of the read-out EEPROM data [3]

Power reset

(for all indoor units connected to the remote controller when the group operation control is performed.)

CASE 3

The EEPROM before replacement is defective and the setting data cannot be read out.

Replacement & power ON for service P.C. board [2]

ò

Writing the setting data to EEPROM, such as high ceiling installation setting and optional connection setting, etc., based on the customer information. [3]

ò

Power reset

(for all indoor units connected to the remote control when the group operation control is performed.)

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Toshiba CEILING TYPE, CONCEALED DUCK TYPE service manual Case, Replacement procedures
Page 63 Page 65

CONCEALED DUCK TYPE, CEILING TYPE specifications

Toshiba has long been a name associated with innovative and efficient HVAC solutions, and their Concealed Duck Type, Ceiling Type air conditioning units exemplify this legacy. These units are designed to provide exceptional comfort while seamlessly integrating into a variety of interior spaces.

One of the main features of the Toshiba Concealed Duck Type, Ceiling Type system is its discreet installation method. Unlike traditional wall-mounted units, this system is installed within the ceiling, allowing for an unobtrusive appearance. The result is a clean and modern aesthetic, ideal for residential and commercial settings where design is a priority. With only the supply and return grilles visible, the units maintain the integrity of the interior decor.

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In summary, Toshiba's Concealed Duck Type, Ceiling Type air conditioning units deliver a blend of innovative technology, energy efficiency, and contemporary design. With features like inverter technology, quiet operation, advanced air filtration, and flexible control options, they offer a compelling choice for those seeking comfort without compromising style. These units stand as a testament to Toshiba's commitment to quality and customer satisfaction in the HVAC industry.
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