Codan 8570 Reference manual

SERVICE BULLETIN
Head Office E17–00183 Issue 2, August 1999
Codan Pty Ltd
ACN 007 590 605
81 Graves Street
Newton
South Australia 5074
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Email: [email protected]
Codan (UK) Ltd
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United Kingdom
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Codan Pty Ltd
Suite 11A, 2 Hardy Street
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Western Australia 6151
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Codan Comunicaciones Ltda.
Av. 11 de Septiembre 2155, Of. 701/A
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Unreliable communication of the 8570
Remote Control Console
Introduction
This Service Bulletin describes how to improve the
communication efficiency of the 8570 Remote Control Console.
It affects all users of the 8570 Remote Control Console that:
Shave serial numbers prior to B0487 with resistor pack R502
(part number 40–83101–500)
Sare communicating with an IPC–500 Radio Telephone
Interconnect, or via an RS232/I2C interface to/from a PC or
a Global Positioning System (GPS)
All 8570 Remote Control Consoles with serial
numbers B0487 onwards have been fitted with the
correct resistor pack (part number 40–82471–500).
Symptoms
Using an IPC–500 Radio Telephone Interconnect
The 8570 Remote Control Console fails to display the correct
channel information from an IPC–500 Radio Telephone
Interconnect. This symptom is most likely to be observed while
the IPC is scanning. During scanning, the 8570 should “mirror”
the channel information from the IPC–500. The channel
information on affected 8570s will remain static when the IPC is
scanning.
This symptom may be difficult to detect because it
rarely occurs and is of an intermittent nature.
Using an RS232/I2C interface
Commands sent to and/or sent from an 8570 via an RS232/I2C
interface will be unsuccessful, or will initiate a poor response.

Unreliable communication of the 8570 Remote Control Console
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Cause
The unreliable communication of the 8570 is caused by excessive series resistance of the
resistor pack R502 (part number 40–83101–500) on the Remote Control Filter PCB. This
causes loading of the I2C Clock and Data lines.
Part required
The following part is required:
S1 x 470 Ω, 20%, 0.1 watt (x 5) resistor package (part number 40–82471–500)
Tools required
The following tools are required:
Spozidrive screwdriver (1 point)
Sdesoldering tool
S60/40 Tin/Lead resin core solder
Ssoldering iron
Action
The modification involves checking which resistor pack is fitted on the Remote Control
Filter PCB in the 8570, and changing the resistor pack if required.
Checking the resistor pack R502
-Disconnect the power and remove the 8570 from the installation.
-Lay the unit face down on a soft surface and remove the four screws securing the front
panel to the chassis.
-Return the unit to its upright position and remove the front panel to expose the PCBs.
-Locate the Audio Processor and Power Supply Unit PCB (next to the power
transformer).
-Remove the eight screws securing the Audio Processor and Power Supply Unit PCB to
the chassis.
-Move the Audio Processor and Power Supply Unit PCB to gain access to the underside
of the Remote Control Filter PCB.
The Remote Control Filter PCB is the small PCB mounted upright in the right–hand
corner of the Audio Processor and Power Supply Unit PCB (see Figure 1).

Unreliable communication of the 8570 Remote Control Console
Page 3 of 417–00183 Issue 2, August 1999
08–03977
Remote Control
Filter PCB
Audio Processor and
Power Supply Unit PCB
Figure 1: Location of Remote Control Filter PCB on the Audio Processor and
Power Supply Unit PCB
-Locate R502 on the Remote Control Filter PCB (see Figure 2).
orientation marks
R502
Figure 2: Location and orientation of R502 on the Remote
Control Filter PCB
-Measure the resistance between pins 1 and 2.
If the resistance is ≈470 Ω, then no action is required.
If possible, check that the part number on R502 is 40–82471–500.
Continue from page 4, Reassembling the 8570.
If the resistance is ≈1 kΩ, then the resistor pack R502 needs replacing.
If possible, check that the part number on R502 is 40–83101–500.
Continue from page 4, Changing the resistor pack R502 on the Remote Control Filter
PCB.

Unreliable communication of the 8570 Remote Control Console
17–00183 Issue 2, August 1999Page 4 of 4
Changing the resistor pack R502 on the Remote Control Filter PCB
-Desolder and remove R502.
-Observing the correct orientation, fit the replacement resistor pack (part number
40–82471–500) in the position that R502 occupied.
Reassembling the 8570
-Refit the Audio Processor and Power Supply Unit PCB into position.
Ensure that the green earth wire is refitted under the mounting screw located
in the corner of the Audio Processor and Power Supply Unit PCB.
Ensure all cables and looms are not pinched or trapped.
-Loosely fit the eight screws that secure the Audio Processor and Power Supply Unit
PCB, then tighten them into position.
-Replace the front panel of the 8570 and secure it into position using the four screws.
-Reconnect the 8570 to the installation, then reconnect the power.