User's Manual

TM 1184 Issue 1 AL1 (May 1997) Page A1 - 17
SERVICING
Repair Policy
37. The following service policy applies to the RPE 673:
a) The Encoder PCB and the Encoder firmware device (IC2) are disposable modules;
both are available as service spares.
b) The Transmitter PCB is repairable to component level (for part numbers, refer to
Section 6).
38. Transmitter alignment procedures (paras 45 - 49) rely on the use of a PC for
Transmitter keying. For alignment procedures without the use of a PC, refer
to Section 5.
Removal / Re-fitting of Circuit Boards
39. Disconnect the antenna and connectors from the rear of the case. At the rear of
the unit unscrew and remove the two retaining screws. Lift the cover slightly (it will only
clear the base by 4 to 5 inches). Carefully disconnect the 8-way flexi-cable from PL1
of the Transmitter. Pivoting on its front edge, invert the cover and slide it under the
base.
40. To remove the Encoder board, de-solder the two screened cables from P4, P5, P6
and P7 of the Encoder PCB (see Figure 6). Remove the four screws to release the
Encoder PCB.
41. When replacing a suspect Encoder PCB with a service replacement PCB,
proceed as follows:
a) Remove the suspect Encoder PCB.
b) Remove the replacement Encoder PCB from its packaging.
c) Carefully transfer the firmware device (IC2) from the suspect Encoder PCB to
the replacement Encoder PCB.
d) Fit the service replacement Encoder PCB.
e) Carry out the Set-up procedure detailed in paras 18 - 25.
42. To Remove the Transmitter board, de-solder the two screened cables from TL1, TL2, TL8
and TL9 of the Transmitter board (see Figure 6). Remove the four securing nuts to
release the Transmitter PCB.
43. Re-assembly is the reverse of dismantling. Replace the 8-Way flexi-cable (removed in
paragraph 39) before re-fitting the cover.