Datex-Ohmeda Aestiva 7900 SmartVent, Technical Reference Manual

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5 Troubleshooting
1006-0453-000 05/04 5-31
5.6 Power supply test points
5.6.1 Power supply board (original CPU)
TP Name Typical Value Description
1 VBOOT +15V Supply to power primary regulator
4 PGND 0V Power ground
7 VIN + 50V Rectified voltage from transformer (30-60 Vdc)
8 VBUS +16.5V Primary regulator output (±5%)
9 BATT_P +13.3 V Battery voltage
11 PGND 0V Power ground
12 VB +16V Power bus from VBUS or battery (±5%)
15 DGND 0V Digital Ground
16 DGND 0V Digital Ground
17/18 VAC (1)/VAC (2) 35 Vac AC from toroid (24-45 Vac); measured across TP17 and TP18
19 5R5_VAUX (+5.5–5.8V) +5.6V Supply for inlet valve, flow valve, and speaker (±5%)
20 VAN15 (-15V) -15V Analog -15V supply (±5%)
21 VAP15 (+15V) +15V 15V supply (±5%)
22 VH_EL +14.5V Supply for EL display (±5%)
23 VDD +5.0V Supply for digital circuit (+3.68%, -3.05%)
24 VSW +15V Supply for VDD Fail Buzzer (±10%)
25 TP25 (+20V) +20V Intermediate supply stage before NOSS (task lights) output
26 P15V_NOSS (+12VLP) +12V Supply for task lights (±5%)
27 VB +16V Power bus from VBUS or battery (not short protected)
28 VBUS +16.5V Primary regulator output (not short protected)
25
12
20 24 8 4 9 21 22 23
16
19
7
28 11
26 1 27
15
18
17