Fellowes Standard Horizon SRN-9x, Service Manual

Page: 59 / 67

N U M B E R E R
PAGE 57
M A N UAL
Section 17 CONTROL SYSTEM - SUCTION
17.2 .... Control System - Access
Access to the control box is by removing the base access panel
under the loading table. To remove the unit you will also need to
remove the operator side cover (see section 1.2), and disconnect
all the plugs from their sockets on the rear panel and from the side
of the enclosure. Also disconnect the sensor connector from the
lid.
If a replacement control box is fitted, it may be necessary to adjust
the alignment of the front panel to suit the aperture in the side
cover. This can be achieved by loosening the four screws which fix
the mounting brackets to the enclosure, and adjusting the position
of the entire box.
The control system enclosure houses all of the switches, fuses,
sockets and other components including the suction control circuit
board (PCB 1) and the motor speed control circuit board (PCB 2)
which are mounted on the underside of the lid. To gain access to
these items, after removing the control box from the machine,
simply lift the lid and hinge it right back.
17.3 .... Suction Control Board - Removal
To remove the control PCB, disconnect the four remaining wiring
plugs by easing them out of their headers. (The main header has
three separate plugs, but unlike the friction control PCB they are
mounted on a vertical header like the mains- in plug.)
Cut any cable securing ties that are on the PCB, taking care not to
damage any of the cables and partly release the PCB from it’s two
supports by depressing their tangs.
Firmly support the PCB by holding the large transformer, remove
the two fixing screws from the outside of the lid and withdraw the
board. (See Fig 16.12 on page 49)