8525B/8528 Technical Service Manual 7-1
Publication No: 15-02036 Issue 6
7 Adjustments
7.1 Introduction
Two types of adjustment are covered under separate headings.
• Channel Addition: change EPROM (no internal adjustments necessary)
• Preset Adjustments: normally factory-set adjustments will require
attention only if components which affect their settings are replaced.
7.2 Channel Addition (EPROM Replacement)
The EPROM is mounted in a socket on the Microprocessor Controller PCB
and may be changed as follows:
1. Place the transceiver upside-down on a bench with the power supply
disconnected.
2. Remove the bottom cover by unscrewing the two retaining screws
(either side of the transceiver) and lift the rear edge of the cover.
3. Two socket-mounted IC’s will be found near the centre of the
transceiver. The EPROM is identified by the number either:
• 90-20283 (8525B)
• 90-20278 (8528)
• 90-20275 (8528S)
4. Carefully remove the EPROM from the socket. (A small screwdriver
may be needed to prise it free.)
5. Plug in the new EPROM.
Note: The notch on the end of the EPROM must be on the left when
viewed from the front of the transceiver, i.e. in the opposite
direction to the other socketed IC.
6. Re-install the bottom cover by placing it on the transceiver so that the
front edge rests on the two spring clips. Press down firmly on the
cover’s front edge and slide it forward until the screw holes are aligned.
Re-install the screws.
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