Infratec™ 1241 Grain Analyzer
5:70 Service Manual 1001 5015 / Rev. 4
5.6 Corrective Maintenance Procedures
Please note that the below instructions regards the new 1241-002 model only.
5.6.1 Cable Stalk Kit
To strengthen the I2C signal integrity, all I
2
C bus cabling is now shielded, with shield
potential connected to logic ground at one end of the cable only.
An upgrade Cable Stalk kit P/N 60028013 is introduced for replacement of I
2
C
cabling in existing Cable Stalk. Infratec 1241-002 delivered prior to 2008-01-01 is
subject for upgrading existing cables.
It is recommended to install the upgrade at next service visit.
5.6.2 Lamp Holder
New Lamp Holder Socket was introduced 2008-01-01 that has socket screw
terminals to secure firm contact. Previous version is exposed for oxidation coating
causing bad contact between lamp and terminals. Typical symptom is Air Stability
Test failure.
Latest revision of 10013351 Lamp Holder Cpl employs the update.
It is recommended to install the update at next service visit.
Fig. 5:73 New lamp holder
5.6.3 DSP board
DSP schematics updated with improved; PLD FW, reset control, filtering on
Detector interface and motor drive protection. Infratec 1241-002 delivered prior to
2008-01-01 is subject for replacement of supplied DSP Board.
Latest revision of P/N 60023758 DSP Board employs the update.
It is recommended to install the update at next service visit.
5.6.4 TWM PCB
Updated Test Weight Module hardware, P/N 10012790 TWM PCB, has been
introduced in production 2008-01-01.
Several Support Incidents in November/December 2007 reported analysis failures
showing error message "Reference scan light level too low". The root cause has been
located to the Test Weight Module (TWM), see detailed description below.
The problem regards TWM used with limited numbers of Infratec 1241-002 new
model, ranging from S/N 12415000 to approx 12415400. More specific; the first
batch of new Infratec model produced prior to 2008-01-01.
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