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Service Inspection Safety Procedures for the 3745, 3746-900, and
Controller Expansion
Important
This procedure addresses the 3745, 3746-900, and the controller expansion. If one of these machines
is not present, ignore the statement concerning this machine in the following procedure.
Introduction
A safety inspection procedure for the 3745, 3746-900, and controller expansion should be per-
formed:
When it is inspected for an IBM agreement
When IBM service is requested and no service has recently been performed by IBM
When an alterations and attachments review is performed
When changes have been made to the equipment that might affect its safety.
If the inspection indicates unacceptable safety conditions, the conditions must be corrected before IBM
services the machine.
Note: The correction of any unsafe condition is the responsibility of the owner of the equipment.
The 3745, 3746-900, and controller expansion areas and functions checked through these procedures are:
1. External covers
2. Safety labels
3. Safety covers and shields
4. Grounding (earthing)
5. Circuit breaker and protector rating
6. Input power voltage
7. Power control switch
8. Power ON indicator.
Note: The 3746-900 is powered ON and OFF through the basic 3745 frame, from a host, locally, or from
the service processor.
Hazardous voltages are still present in some areas of the 3745 and the 3746-900 when power is
OFF.
Steps 1 through 6 must be performed after power OFF as follows:
CB1s are switched OFF on the 3745 and 3746-900.
All equipment installed in the controller expansion (if present) is powered OFF.
Power supplies for the 3745, 3746-900, and controller expansion at customer's premises are
switched OFF.
Do not remove the power cord and ground strap A of the controller expansion in order to maintain
the ground protection (see Figure 0-2 on page xxi, Figure 0-3 on page xxii, Figure 0-4 on page xxiii,
or Figure 0-5 on page xxiv).
1External Covers
Check that:
They are all present on the 3745, 3746-900, and controller expansion.
They are locked with two kinds of locks: flat blade screw for the IBM access area and hex head
for the customer access area (refer to the
IBM 3745 Communication Controller Models 130 to
17A, Parts Catalog
, S135-2012).
They can be fully opened.
xviii 3745 Models 130 to 17A: MIP