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The approximate locations of the 16 trimmer capacitors on the Filter board are shown in Figure 1.
Relays K3-K6 are shown for reference.
Note that each trimmer's body has a narrow end, and that they
are not all oriented in the same direction.
The trimmers must be oriented as shown to keep their rotor
terminals at ground potential. This will allow them to be aligned with a metallic tool.
Figure 1
Install trimmer capacitors C1-C8 and CA-CH with their narrow ends oriented as indicated above
(toward the flat side of the outline on the pc board). Each trimmer must be gently pressed down as far as it
will go, but be careful not to bend the leads.
Solder all of the trimmer capacitors. Use just enough heat and solder to produce a clean, shiny solder
joint (and fill the hole). It should take no more than 2-3 seconds to solder each lead.
Do not trim the leads
.
Place relays K1-K8 at their indicated locations.
DO NOT bend the relay leads to hold the relays on
the board, as this can cause mechanical stress.
Note that the relays can only be installed one way due to
a gap between pins.
Carefully flip the board over, using a hardcover book to hold the relays in place. Make sure none of
the relays have fallen out, and that their leads are fully inserted into their PC board holes.
Solder just two pins (at opposite corners) on each relay, using a minimum amount of solder.
Limit
soldering time to 2 or 3 seconds per pin to avoid damaging the relays.
Look at the relays from the top side of the board. If any of them are not fully seated onto the PC board,
re-heat the pins one at a time and gently press the relays down.
Solder all remaining relay pins.
Do not trim the leads.
