182 lines
7.8 KiB
Plaintext
182 lines
7.8 KiB
Plaintext
[[toc]]
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## G5 Front Pinouts
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So as to alleviate foolishness, the G5 front panel pinouts, as sourced from the 2005 Power Mac G5 Service Source manual, are:
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<--- Locking plastic notch is on this side
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1 2
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+---+---+
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25V - | o | o | - V-GND
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+---+---+
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FW TPA - | o | o | - FW TPA+
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+---+---+
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CHS GND FW - | o | o | - CHS GND USB
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+---+---+
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FW TPB - | o | o | - FW TPB+
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+---+---+
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USB PWR - | o | o | - USB GND
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+---+---+
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USB- - | o | o | - USB+
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+---+---+
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LED - | o | o | - PWR BTN
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+---+---+
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AUDIO SENSE - | o | o | - AUDIO COM
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+---+---+
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AUDIO RIGHT - | o | o | - AUDIO LEFT
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+---+---+
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## USB Pinouts
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1 2
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+---+---+
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VCC - | o | o | - USB +5V
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+---+---+
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USB0- - | o | o | - USB1 -
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+---+---+
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USB0+ - | o | o | - USB1 +
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+---+---+
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GND - | o | o | - GND
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+---+---+
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| | o | - USB Shield GND
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+---+---+
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G5 6(CHASSIC GND USB) to 10(Shield)
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G5 9(USB PWR) to 1 (VCC)
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G5 10(USB GND) to 7 (GND)
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G5 11(USB-) to 3 (USB0 -)
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G5 12(USB+) to 5 (USB0 +)
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For some inexplicable reason, other people's front panel diagrams were pretty screwed up - USB0- to USB- and USB1- to USB+ and similar. Additionally, the most "officious" (most commonly found) G5 front panel pinout had pins 11 and 12, aka USB- and USB+, reversed! According to the official Power Mac G5 Service manual, which covers the Power Mac G5, Power Mac G5 (June 2004), and Power Mac G5 (Early 2005), pin 11 is USB- and pin 12 is USB+.
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## Audio Pinouts
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1 2
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+---+---+
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MIC_L - | o | o | - GND
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+---+---+
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MIC_R - | o | o | - PRESENCE
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+---+---+
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LINE_R - | o | o | - SNS1_RETURN
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+---+---+
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SNS_SEND - | o | |
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+---+---+
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LINE_L - | o | o | - SNS2_RETURN
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+---+---+
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G5 17(AUDIO RIGHT) to 5 (LINE_R)
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G5 16(AUDIO LEFT) to 9 (LINE_L)
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G5 15(AUDIO SENSE) to 10 (SNS2_RETURN) -- one schematic tied 10 to 7
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G5 16(AUDIO COM) to 2 (GND) -- one schematic also tied in 4
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Note that, according to some vague forum sources, you could also tie SNS_SEND to SNS2_RETURN to allow for selection of the device from the operating system:
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G5 17(AUDIO RIGHT) to 5 (LINE_R)
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G5 16(AUDIO LEFT) to 9 (LINE_L)
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G5 16(AUDIO COM) to 2 (GND)
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G5 16(AUDIO COM) to 4 (PRESENCE)
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10 (SNS2_RETURN) to 7 (SNS_SEND)
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## G5 Fan Pinouts
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Definitions:
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* PWM is Pulse Width Modulation
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* SNS is Sense/Fan RPM
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* GND is common ground
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* 12V is constant +12V (obviously)
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* TMP is temperature sensor
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All PowerMac G5 fans use the same basic pinout of PWM, SNS, GND, 12V, from pin 1 to pin 4, respectively.
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The regular hard-drive bay fan and the PCI fan use the following pinouts:
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PWM SNS GND 12V
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pin 1 +---+---+---+---+ pin 4
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| o | o | o | o |
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+---+---+---+---+
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The "blower" hard-drive bay fan uses a 5-pin connector, however the 5th pin is not connected, so you can safely ignore it:
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PWM SNS GND 12V
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pin 1 +---+---+---+---+---+ pin 5
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| o | o | o | o | |
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+---+---+---+---+---+
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The front CPU fans use the following pinouts:
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PWM1 S1 GND 12V PWM2 S2 TMP- TMP+
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| | | | | | | |
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pin 1 +---+---+---+---+---+---+---+---+ pin 8
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| o | o | o | o | o | o | o | o |
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+---+---+---+---+---+---+---+---+
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The back CPU fans use the following pinouts:
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PWM1 S1 GND 12V PWM2 S2
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pin 1 +---+---+---+---+---+---+ pin 6
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| o | o | o | o | o | o |
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+---+---+---+---+---+---+
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## PC Fan Header Pinouts
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4-pin ATX motherboard headers, such as those used for the CPU fan are:
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GND 12V SNS PWM
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pin 1 +---+---+---+---+
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| o | o | o | o |
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+---+---+---+---+
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The more common 3-pin motherboard header is the same as the 4-pin, but missing the fourth PWM pin:
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GND 12V SNS
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pin 1 +---+---+---+
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| o | o | o |
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+---+---+---+
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## G5 to PC Fan Pinouts
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The basic notion is to use the PC motherboard's 4-pin fan header to drive the G5 fans. If you do not have a 4-pin female connector, then a floppy-style molex connector will also fit the motherboard's 4-pin header. The basic pinout for using the motherboard's 4-pin header, in text, is:
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G5 1(PWM1) to HDR 4(PWM)
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G5 2(SENSE1) to HDR 3(SENSE)
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G5 3(GROUND) to HDR 1(GROUND)
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G5 4(12V) to HDR 2(12V)
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G5 5(PWM2) to HDR 4(PWM)
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G5 6(SENSE2) to NOTHING
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On my Gigabyte 970A-UD3P motherboard, which uses an ITE 118620E, pin 4 was listed as "Reserved" and output around 4.97 volts constant - this imples +5V VCC, not PWM. However, when I connected all 4 pins to the motherboard, pin 4's output dropped to around 3.5V - this is insufficient to drive "max" PWM for the G5 fans.
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However, in the case that your fourth pin does not provide PWM or a constant +5V, or if you're using a 3-pin motherboard header, then you must borrow +5V from the PSU's molex connector. The basic schematic is:
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G5 1(PWM1) to PSU +5V
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G5 2(SENSE1) to HDR 3(SENSE)
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G5 3(GROUND) to HDR 1(GROUND)
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G5 4(12V) to HDR 2(12V)
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G5 5(PWM2) to PSU +5v
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G5 6(SENSE2) to NOTHING
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Alternatively, one could make a circuit to convert the variable mobo header +12V to a PWM signal - G5 pin 4 would then have to be powered by a separate +12V molex pin.
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If you don't wish to power the fan(s) through the motherboard header, you can instead use a PSU molex connector only:
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G5 1(PWM1) to PSU +5V
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G5 2(SENSE1) to NOTHING
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G5 3(GROUND) to PSU GROUND
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G5 4(12V) to PSU +12V
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G5 5(PWM2) to PSU +5v
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G5 6(SENSE2) to NOTHING
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One thing to keep in mind when powering multiple fans from a motherboard header is that the motherboard is only rated to provide a certain amount of amperage through that header - if it exceeds this amount, you can risk damaging the motherboard or the chip responsible for powering the fans. In general, it seems that each fan header provides 1 amp max, however this varies between manufacturers and models, so ensure that you do not exceed this amount.
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I am unsure of the actual amperage draw of the G5 fans - standard "PC" fans use around 0.15a, and as far as I can tell, running the G5's fans from the motherboard's header doesn't cause any issues, not even with dual G5 CPU fans running from the same header. I also ran the system through a watt measurement tool and could not find any actual increase in wattage - in fact, the meter measured lower values on average with the G5 fans connected (121-122 without fans, 118-120 with fans). The decrease is most likely due to the CPU fan not being forced to spin as much to keep cool.
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## G5 Speaker to PC Pinouts
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The speaker pinouts are fairly obvious and the only thing you need to keep track of is the polarity. On the G5's front fan/speaker combo, the 2-pin cable is for the speaker, and the wire with the white stripe down the side represents positive. Most PC motherboards use a 4-pin header plug that only has two wires attached - the pinout is:
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G5 white(+) to HDR 1(+)
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G5 black- to HDR 4(-)
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This could vary for you, so ensure that positive maps to positive and negative to negative.
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