47
4.4 Unplug the ribbon cable that runs from
the Interface board (12) at the rear of the
amplifier chassis (23) to the processor board
at J800.
4.5 Unplug the ribbon cables that run from
the amplifier board inside the amplifier RF
module housing up to J601 and J602 of the
processor board.
4.6 Disconnect the ribbon cable that runs
from J101 on the processor board to the rear
corner of the amplifier near the opening for
the input module. Remove the top screw (4)
and nut (27), loosen the bottom screw and lift
the connector away from the chassis. Be
sure to retain the screw and nut for replace-
ment later.
4.7 At the corner of the signal processor
board near the power connector, lift the
board corner off the two guide posts. Lift off
the signal processor board.
Note: Refer to Figure 3 for the following
procedures.
5. Amplifier Board Removal
Note: The amplifier board is located inside
the amplifier module RF housing.
5.1 Perform procedure 3.
5.2 Unplug the ribbon cables that run from
inside the amplifier board housing up to J601
and J602 of the signal processor board (6).
5.3 At the corner of the signal processor
board near the power connector, lift the
board corner off the two guide posts. Lift off
the signal processor board.
5.4 With the signal processor board re-
moved, use a 3/16" nut driver to remove the
24 screws (8) that secure the RF shield (5)
to the the amplifier module housing. Lift the
RF shield away from the amplifier module
housing. The amplifier board (4) will now be
exposed.
5.5 Remove the screws (9) that secure the
output devices and thermistor RT600 to the
heatsink.
5.6 Remove the 12 screws that secure the
amplifier board to the amplifier module RF
housing. Lift the amplifier board clear of the
housing.
Re-assembly Note: Make sure that there is
sufficient thermal grease on the output
devices and insulators (2). Secure the output
devices and thermistor RT600 to the
heatsink using the screws (9) removed in
step 5.5.
Note: Refer to Figures 1 and 2 for the
following procedures.
6. Display Board Removal
6.1 Perform procedure 3.
6.2 On the front panel of the amplifier, place
both of the level control knobs (1) to mini-
mum gain (fully CCW). Pull off both of the
knobs from the shafts of the potentiometers.
6.3 Remove the four screws (11) that secure
the display board (26) to the rear of the front
panel of the amplifier chassis (23). Lift out
the display board.
7. AC Input/Output Board Removal
7.1 Disconnect the AC Mains cable from the
back of the amplifier.
7.2 Perform procedure 1.
7.3 Unplug any connectors that may be
connected to the CH1 and CH2 output jacks.
7.4 Make a note of the color code for the
wiring that runs to the AC Input/Output
board (13) and remove the wires from the
terminals. Make a note of the connector
orientation and remove the cable at J100
that runs down to the Interface board (12).
DISASSEMBLY PROCEDURES
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