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Zhone Tech Tip TT#33
February 15, 2011
900 Power Cable Maintenance
This procedure is provided to our customers experiencing intermittent and unexplained
PSU alarms that raise and clear on their own. Please refer to Zhone Field Advisory
bulletin 20071206-2 FAB – IMACS Power Supply OOS Alarm in order to clear these
alarms.
This Tech Tip is written to describe the process used to clean the power cable on the
IMACS-900 shelf. Please refer to Zhone Tech Tip #34 for the proper procedure if
maintenance to clean the power cable is required on an IMACS-600 or IMACS-800 shelf.
The IMACS-900 uses a 18-pin wiring harness to connect the power PCB to the shelf
PCB. The cable is shown in Figure 1.
This procedure is provided to augment the Field Advisory bulletin 20071206-2 FAB –
IMACS Power Supply OOS Alarm. This Tech Tip provides greater detail on the item
under the section for Valid Alarms of that bulletin, and specifically the note that
indicates:
•
Bad physical connection on the wiring harness cable due to oxidation or
poor environmental conditions. Remove wiring harness, clean with
degreaser and alcohol solvent, apply NO-OX-ID lubricant and reconnect
wiring harness.
NOTE: This procedure requires that the IMACS be powered-down to perform this
service. Be sure to remove all power sources from the IMACS before beginning this
Zhone Technologies, Inc. @Zhone Way, 7001 Oakport St., Oakland, CA 94621 (510) 777-7000 Fax: (510) 777-7001
Figure 1: Power Cable IMACS-900
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Summary of Contents for Zhone 900
- Page 1 IMACS-900 shelf. Please refer to Zhone Tech Tip #34 for the proper procedure if maintenance to clean the power cable is required on an IMACS-600 or IMACS-800 shelf. The IMACS-900 uses a 18-pin wiring harness to connect the power PCB to the shelf PCB. The cable is shown in Figure 1.
- Page 2 Two zip ties Procedure Overview: This procedure to clean the power supply cable is for the IMACS-900 shelf. It is suggested that this procedure be performed on any IMACS shelf over ten years old at the same time as the Interface card battery replacement. To find out more about the Interface card battery replacement, call your Zhone representative and ask about GSS service product codes 3021AR and 3021FG.
- Page 3 Figure 2: IMACS-900 Power Cable Location The Power Supply cable is located on the front of the IMACS-900 and extends between the top power supply portion of the shelf behind slot F2 and the lower shelf backplane behind circuit card slot U8.
- Page 4 15. Validate service. In order to service the power cable on the IMACS 900, the power block at the upper right hand corner of the shelf must be removed. Refer to figure 3 below to identify the securing screws which must be removed in order to service the unit.
- Page 5 Use extreme caution when cutting these tie-wraps to ensure that the power cable is not accidentally damaged. Zhone Technologies, Inc. @Zhone Way, 7001 Oakport St., Oakland, CA 94621 (510) 777-7000 Fax: (510) 777-7001...
- Page 6 The cable is held in place by locking edges on the connector and the mating connector housing. This mechanism is used to securely hold the cable to the motherboard – see Figure 5 below. Zhone Technologies, Inc. @Zhone Way, 7001 Oakport St., Oakland, CA 94621 (510) 777-7000 Fax: (510) 777-7001...
- Page 7 Be careful to thread the cable through the slot to the right of user card U8, so that the cable can then be re-fastened to the side wall of the IMACS-900 shelf. The action of installing the cable onto the posts also provides some abrasive cleansing, so placing the cable onto the posts and then removing it a few times helps to ensure a more thorough contact area.
- Page 8 Thread a tie-wrap through the metal holders located on the side wall of the IMACS-900 shelf as illustrated in Figure 4 above. These cable ties secure the cable to the shelf, so that they do not interfere with the user card in slot 8, nor with the power block that has been temporarily moved out of the way.