Page
16 of 40
Issue 2
13/12/99
PETS-2 Crossing Telephone System
QUICKFIX INSTALLATION HANDBOOK
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4.4.1 Item 6 - Transmission Card (A33837)
There is a single Transmission Card in each frame, located to the left hand side. The card
is identical at Signalbox and at the Level Crossing.
4.4.2 Item 7 - Line cards (A33838 - Level Crossing), (A35173 - Signalbox)
In the Signalbox unit a single line card is provided in the Line 1 position. The card is
electrically identical to those of the Level Crossing, the only difference being the button
arrangement for use with the membrane overlay.
In the Level Crossing units, Line1 and Line 2 cards are fitted.
4.4.3 Item 8 - CPU card (A33839 - Level Crossing), (A35176 - Signalbox)
The Signalbox card is electrically identical to those of the Level Crossing, the only
difference being the button arrangement for use with the membrane overlay. This card
houses the seven segment display and the system firmware. The same version of firmware
can be used throughout. DIL switches on the motherboard distinguish the Signalbox and
Level Crossing units, additionally establishing whether the hardware is original PETS or
PETS 2.
4.4.4 Item 9 - Power Supply & Ringer Card (A33898)
There is a single Power Supply & Ringer Card in each frame, located to the right hand side.
The card is identical at Signalbox and at the Level Crossing.
4.4.5 Item 10 - Fuse12V (fused)
Located to the left hand side this fuse protects the ex12V from the frame.
4.4.6 Item 11 - Earth stud for wrist strap
Connection point for wrist straps
4.4.7 Item 12 - Card Pullers
A pair of card pullers are located to the right hand side. This is a convenient stowage
location. The large ring is to be pulled by the fore-finger of each hand. The bent end of each
puller is located in the upper or lower holes at the front edge of each card. See photograph
