TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994
TM-9-2350-311-20-1

  TM-9-2350-311-20-1 - Page 394 of 1275

TM 9-2350-311-20-1
3-3 TROUBLESHOOTING CHART — CONTINUED
aa. PERSONNEL VENTILATION BLOWER CIRCUIT
The personnel ventilation blower system consists of the personnel ventilation blower and the accessory control box. The
diagram below shows the relationship of these components.
When the MASTER switch is turned ON, 24 Vdc is supplied from the batteries through the master relay to the accessory
control panel. When the ventilation blower switch is set to EXHAUST, voltage is applied to energize the personnel
ventilation blower in either a forward or reverse direction.
3-294


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