M850-00
T858/859 PCB Information
D5.1.3
Copyright TEL 31/09/98
6.1 Introduction
Product Type Identification
You can identify the PA type by checking the product code printed on a label on the rear of the chas-
sis/heatsink (product codes are explained in Section 1.3 in this Part of the manual, and Figure 1.1 in
Part A shows typical labels).
PCB Identification
All PCBs are identified by a unique 10 digit “internal part number” (IPN), e.g. 220-01390-02, which
is screen printed onto the PCB (usually on the top side), as shown in the example below:
The last 2 digits of this number define the issue status, which starts at 00 and increments through 01,
02, 03, etc. as the PCB is updated. Some issue PCBs never reach full production status and are there-
fore not included in this manual. A letter following the 10 digit IPN has no relevance in identifying
the PCB for service purposes.
Note:
It is important that you identify which issue PCB you are working on so that you can
refer to the appropriate set of PCB information.
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