TA2922 Universal Line Interface Service Manual 37
© Tait Electronics Limited March 2010
SK1 I/O matrix bottom-side solder links
Rather than fitting resistors to the 26 row x 9 column I/O matrix on the top side
of the board, solder link pairs on the bottom side can be alternatively fitted. Each
pad is connected in parallel with a pair of solder link pads on the bottom side of
the board. These links also define the input and output signals of each of the nine
pins on the external D-range connector SK1. See “SK1 I/O signal summary” on
page 26.
Solder link pads on the bottom side of the board have a ‘W’ designation which is
equivalent to the resistor ‘R’ designation on the top side. For example, R46-2 on
the top side is in parallel with link W46-2 on the bottom side (grid location F1).
It is essential to remove existing components from the top side of the matrix, or
check carefully that existing links do not conflict before fitting solder links to the
bottom side of the matrix. Failure to do so may result in unexpected operation or
permanent damage to the TA2922 interface.
O
R127-2 R128-2 R129-2 R130-2 R131-2 R132-2 R133-2 R134-2 R135-2
P
R136-2 R137-2 R138-2 R139-2 R140-2 R141-2 R142-2 R143-2 R144-2
Q
R145-2 R146-2 R147-2 R148-2 R149-2 R150-2 R151-2 R152-2 R153-2
R
R154-2 R155-2 R156-2 R157-2 R158-2 R159-2 R160-2 R161-2 R162-2
S
R163-2 R164-2 R165-2 R166-2 R167-2 R168-2 R169-2 R170-2 R171-2
T
R172-2 R173-2 R174-2 R175-2 R176-2 R177-2 R178-2 R179-2 R180-2
U
R181-2 R182-2 R183-2 R184-2 R185-2 R186-2 R187-2 R188-2 R189-2
V
R190-2 R191-2 R192-2 R193-2 R194-2 R195-2 R196-2 R197-2 R198-2
W
R199-2 R200-2 R201-2 R202-2 R203-2 R204-2 R205-2 R206-2 R207-2
X
R208-2 R209-2 R210-2 R211-2 R212-2 R213-2 R214-2 R215-2 R216-2
Y
R217-2 R218-2 R219-2 R220-2 R221-2 R222-2 R223-2 R224-2 R225-2
Z
R226-2 R227-2 R228-2 R229-2 R230-2 R231-2 R232-2 R233-2 R234-2
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