User's Manual

2-5
REPLACEMENT
(1) Align the two female connectors on the control board with the male connectors
on the Mother Board using the four mounting holes and standoffs as a guide.
Secure control board to the Mother Board standoffs with four screws and washers.
(2) Replace dust cover as described in paragraph 2.2.1.
2.2.5 Remove/Replace Crystal Filter Board, p/n 923069 or Jumper Board, p/n 923074
REMOVAL
(1) Remove dust cover of unit as described in Paragraph 2.2.1.
(3) Remove and retain the four screws securing the crystal filter board, p/n 923069-1
(or jumper Board, p/n 923074) to the standoffs on the external frequency set
module A5A1. Pull the crystal filter board assembly straight up to avoid damaging
the connector pins.
REPLACEMENT
(1) Align the pins on the bottom of the crystal filter board with their sockets on the
memory set board. Push the crystal filter board straight down until it rests on the
memory set board standoffs and secure with the four mounting screws.
(2) Connect Module A5A1 co-axial jumper leads to jumper J2/P3 on Rx/Tx Module A1,
if not already connected. Either a crystal filter board, p/n 923074 or a jumper
board, p/n 923074 must be installed and the A5A1 co-axial jumper leads connected
to J2/P3 on the Rx/Tx Module A1, for the receiver to work.
NOTE: Make certain that the memory set board, module A5A1 is programmed to the same
operating frequency as the crystal filter board assembly. If no crystal filter board assembly
(option) is installed, jumper board assembly P/N 923074-1 must be installed.
2.3 CHANNEL FREQUENCY PROGRAMMING
2.3.1 Introduction
Transceiver Model TSC-4400, as shipped from the factory, is preprogrammed with a test
frequency. Before programming a new frequency, perform an operational check. If there is
any deficiency or equipment malfunction, the transceiver is to be returned to the
manufacturer, Technisonic Industries Limited, under warranty.
2.3.2 Frequency Range
The operating frequency may be programmed over the frequency range 118.000 MHz to
138.000 MHz with 8.33kHz or 25kHz channel spacing.
2.3.3 Frequency Programming Requirements
A personal computer is required to reprogram a new frequency into the transceiver channel
memory. Refer to document 04RE332 (Section 3, Addendum A) for detailed instructions on
TDP-90 software installation and operation.