Voltage monitor is low when should be high

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Here is an updated list of errors shown on keypad display of the Senior Swing control: Er04 - Voltage Monitor was high during Opening hardware check. Er05 - Master or slave CPU has oscillator ...
If the Main AC fuse is blowing, the control box is defective and needs to be replaced.  The "Main Fuse" is a (5x20MM) 1 Amp Slow Blow fuse. If the 12VAC fuse is blowing, verify they are not trying...
Coin cell replacement is not immediately registered by the AD200/250 firmware.
Performing a processor reset (pressing and releasing S1 on the Main PCB Assembly) will register the new coin cell.
Cycling lock power (i.e., disconnecting and reconnecting the "AA" battery pack) will register the new coin cell.
The coin cell part number is CR2025 - 3 volt lithium - available at most battery or electronics stores.
Information on low battery threshold and nuisance delay is noted below: New firmware now has improved levels. - These are approximate values/levels which change with measurement meters and measure...
AD400/AD200/AD250 After ADFwPkg 2.17.0 - June 2011 4 Battery Holder New batteries = 6.2 VDC Low battery threshold is 4.7 VDC for SM & MT - and 3.7 VDC for MAG and PROX (USB stops working at 4...
    AD400/AD200/AD250 After ADFwPkg 2.17.0 - June 2011 8 Battery Holder New batteries = 12.4 VDC Low battery threshold is 7.2 VDC Critical battery threshold is 6.9 VDC Coin cell = new/...
CO2004 Battery Holder (ONLY) New batteries = 6.2 VDC Low battery threshold is 4.2 VDC Critical battery threshold is 3.9 VDC Coin cell = new/full is 3.0 VDC, low is 2.8 VDC
CO2504 Battery Holder (ONLY) New batteries = 6.2 VDC Low battery threshold is 4.2 VDC Critical battery threshold is 3.9 VDC Coin cell = new/full is 3.0 VDC, low is 2.8 VDC
  CO200 & CO250 Disable coin cell Nuisance delay and blink, With CO.A.7 and SUS 4.10.2 or newer for CO200 and CO250, you can use the SUS/HHD, under Lock Properties, Edit, to de-select, DISABLE, t...
The LCN Bollard post (8310-866) only accepts the "square" actuators (no round actuators). The size of the Bollard post is 4” X 6” X 36”. Acceptable actuator part numbers are: Hard Wired -  831...
Magstripes come in two main varieties: high-coercivity (HiCo) at 4000 Oe and low-coercivity (LoCo) at 300 Oe but it is not infrequent to have intermediate values at 2750 Oe. High-coercivity magstri...