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Service Bulletin
DOCUMENT NUMBER: 17-00166
ISSUE NUMBER:
1
ISSUE DATE:
May, 96

RELATED DOCUMENTS:
C/R

VCO 2 Unlock in 9323 and 9360 series transceivers
1.

Introduction
9323, 9360 and 9360-30 transceivers fitted with version 4.10 software are likely to suffer
VCO2 (Voltage Controlled Oscillator ) unlock problems under certain conditions. The
modification described in this Service Bulletin overcomes this.
The modification should be performed if;
a) VCO2 unlocks as described in section 3
or
b) If the transceiver is fitted with version 4.10 software AND the Serial Number is not
specified below

2.

Serial Numbers
The modification detailed in this Service Bulletin has been incorporated into transceivers
with the following Serial Numbers.

3.

9323.

D0311, D0312, and D0464 onwards

9360.

D0108, D0133, D0296, D0297, D0298, and D0307 onwards

9360-30

D0235 onwards

Details
The VCO unlock condition will occur under one or more of the following conditions,
• Power Up
• An interruption to the power supply causing the transceiver to reset (such as cranking of
a motor)
• High Humidity
The unlock error can be temporarily cancelled by turning the radio OFF and then back ON.
To prevent re occurrence, the following modification must be done.

Head Office
Codan Pty Ltd
ACN 007 590 605
81 Graves Street
Newton
South Australia 5074
International +61 8 8305 0311
Facsimile
+61 8 8305 0411

E-mail:
HF@codan.com.au
World-wide web:
http://www.codan.com.au

Codan (UK) Ltd
Gostrey House
Union Road
Farnham, Surrey GU9 7PT
United Kingdom
International +44 1252 717 272
Facsimile
+44 1252 717 337
Telex
858355

Page 1 of 3
Codan Pty Ltd
Suite 11A, 2 Hardy Street
South Perth
Western Australia 6151
International +61 8 9368 5282
Facsimile
+61 8 9368 5283

VCO 2 Unlock in 9323 and 9360 series transceivers

4.

Modification
WARNING
If a 9323/9360/9390 Technical Service Manual is to be used to do this modification,
observe the following precaution.
The overlay diagram 08-04962-001 shows the position of R72 and R74 transposed. The
correct position of R74 is adjacent to C248 and test point +5VB.
The silkscreen on the Receiver Exciter Assembly is CORRECT.

4.1

Tools required
Pozidrive screwdriver (1 point)
Soldering Iron
Side Cutters
Small pliers

4.2

Materials required
1 x 1KΩ, 0.25 watt, (CR25) resistor
Tinned Copper Wire
60/40 Tin/Lead resin core solder

4.3

Procedure
1. Disconnect power from the transceiver and remove from the installation.
2. Remove the top cover.
3. Referring to the diagram, locate the position of R73 and R74. (Neither of these resistors
are fitted).

Figure 1: Position of R73 and R74 (Bottom Left Hand Corner of 08-04962)
Page 2 of 3

17-00166 Issue 1

VCO 2 Unlock in 9323 and 9360 series transceivers

4. Remove the Receiver Exciter assembly from the chassis.
5. Using tinned Copper Wire (TCW), fit and solder a link into the holes marked R73. Trim
excess lead length.
6. Fit and solder the 1KΩ resistor into the holes marked R74. Trim excess lead length.
7. Fit and secure the Receiver Exciter assembly into chassis.
8. Refit plugs ensuring correct placement and orientation.
9. Fit top cover
10.Reinstall
11.Connect power.

17-00166 Issue 1

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