- Joined
- Nov 22, 2012
- Messages
- 1,052
No that’s not a typo in the title...
I look after a bunch of SLR5700 repeaters and they seem to be collectively loosing fans after 5 years or so in service. The 1RU SLR5700 uses three identical 38mm San Ace 38 series DC tube axial fans made by Sanyo Denki to cool the power supply module, the modem (receiter) and the PA FRUs. If you’re not familiar with the SLR 5700 then you can follow along at home by watching this first:
Fan replacement can’t be done with the repeater mounted in a rack and is almost impossible to do without powering off. Break out a T10 Torx driver and remove all the external screws plus the internal screws that hold the plastic front panel. While the fans simply clip in place, there are 15 screws that need to be removed to get at them! I’m seriously considering milling away the plastic front panel to allow future fan replacement without the faff of disassembling the repeater.
Next problem is sourcing the fans. Moto has a kit PMLN7244 SLR 5000 Series Fan Assembly Service Kit that’s about $75 or so. YMMV. The issue I had was not so much the price but availability in these COVID times. The same fan from Digikey (but without the four pin Molex plug, bracket, and bushings) was like $13, part number is 9GA0312P3K001. These were out of stock so I had to settle for 9GA0312P3J001. The ideal part is 9GA0312P3K0031 which has the Molex plug attached, not certain if that’s a Sanyo Denki special for Moto or a stock unit, either way they’re available on AliExpress for $26.
So, settling for the available part number with slightly less blow (20.1 vs 21.2 CFM) I snipped off the Molex plugs from the dead fans and soldered then to the new fans covering the joins with heat shrink. New fans on the left and old fans on the right prior to swapping the Molex plugs and brackets. Three fans are required per repeater.
Here's one after surgery with an original fan retention bracket attached:
Unfortunately, the fan flanges are not identical to the originals. Not certain if this was related to the part number or a production change, the image below shows the issue and it made mounting the fans using the rubber bushings a bit of a pain. The upper unit is the new fan and the rubber bushings need to pulled down the mounting tubes. The lower fan is the original type with the bushings pulled thru a flange rather than a tube.
Posting this not as a money saving tip but as an availability work around.
I look after a bunch of SLR5700 repeaters and they seem to be collectively loosing fans after 5 years or so in service. The 1RU SLR5700 uses three identical 38mm San Ace 38 series DC tube axial fans made by Sanyo Denki to cool the power supply module, the modem (receiter) and the PA FRUs. If you’re not familiar with the SLR 5700 then you can follow along at home by watching this first:
Fan replacement can’t be done with the repeater mounted in a rack and is almost impossible to do without powering off. Break out a T10 Torx driver and remove all the external screws plus the internal screws that hold the plastic front panel. While the fans simply clip in place, there are 15 screws that need to be removed to get at them! I’m seriously considering milling away the plastic front panel to allow future fan replacement without the faff of disassembling the repeater.
Next problem is sourcing the fans. Moto has a kit PMLN7244 SLR 5000 Series Fan Assembly Service Kit that’s about $75 or so. YMMV. The issue I had was not so much the price but availability in these COVID times. The same fan from Digikey (but without the four pin Molex plug, bracket, and bushings) was like $13, part number is 9GA0312P3K001. These were out of stock so I had to settle for 9GA0312P3J001. The ideal part is 9GA0312P3K0031 which has the Molex plug attached, not certain if that’s a Sanyo Denki special for Moto or a stock unit, either way they’re available on AliExpress for $26.
So, settling for the available part number with slightly less blow (20.1 vs 21.2 CFM) I snipped off the Molex plugs from the dead fans and soldered then to the new fans covering the joins with heat shrink. New fans on the left and old fans on the right prior to swapping the Molex plugs and brackets. Three fans are required per repeater.
Here's one after surgery with an original fan retention bracket attached:
Unfortunately, the fan flanges are not identical to the originals. Not certain if this was related to the part number or a production change, the image below shows the issue and it made mounting the fans using the rubber bushings a bit of a pain. The upper unit is the new fan and the rubber bushings need to pulled down the mounting tubes. The lower fan is the original type with the bushings pulled thru a flange rather than a tube.
Posting this not as a money saving tip but as an availability work around.
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