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BACTEC® 9050 System User's Manual
6.3.3.11 Main Transformer
The main power transformer is mounted t o the bottom chassis in the right
electronics compartment.To replace the main transformer, follow the steps be-
low and refer to Figures 45, 46, and 47.
Required Materials
7/1: wrench
To Replace the Main Transformer
I R e m o v e the rear cabinet shell as described in Section 6.3.3.1.
2 R e m o v e the Electrical Guard as described in Section 6.3.3.2.
3 R e m o v e the cable harness from the tie-ups that secure it to the chassis
upright. Unplug the cable harness. Be careful not to bend the varistor (red
disk) on the AC Distribution Board when unplugging the connector.
4 F o r instrument serial numbers 1000 - 1695 only, disconnect the ground
wire that is attached to the chassis bottom (see Figure 45).
For instrument serial numbers 1696 and above, remove the bolt that holds
the transformer to the chassis and lift the transformer out of the cabinet
(see Figure 46).
5 R e p l a c e the transformer by reversing the above steps. Note that when re-
placing the transformer, components should be placed in the following or-
der (from bottom to top): rubber insulating pad, transformer, rubber insu-
lating pad, metal disk.
For instrument serial numbers 1000- 1695 only,when reattaching the ground
wire, from the bottom you should place: (all other ground wires undis-
turbed), the ground lug, the flat washer, the lock washer, the nut.
Figure 4 5 - Main Transformer Removal (A)
For Instrument Serial Nos. 1000 - 1695 Only
90
MA-0103-5
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