Ericsson I 888 Trouble-Shooting Instruction page 32

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I888, Standard Electrical Repairs

If the voltage is missing on a part of a row, e.g on button 2 and 3 but not on button 1,

is there a foil damage and the board has to be discarded. Verify by measuring the

resistance between a working pad and a faulty pad.

If a complete column is missing, measure the resistance between the pad (Fig 8.4)

and the corresponding pin at D600 (Fig 8.3)(measure on the "c"-shaped side of the

pad). If there is a foil damage the board has to be discarded. If the foil is okay,

replace D600 (class B). If a part of a column is faulty, measure the resistance

between the pads in the column to verify a foil damage.

(42)

4-00021-2/FEA 209 544/5.C

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