Power Board Troubleshooting; Control Board Troubleshooting - Bosch ACS 561 Repair Instructions

Diagnostics and Testing

Power Board Troubleshooting

1. Possible reasons to replace the power
board:
• No power to any components.
• A solenoid won't open.
• Compressor and fan won't start.
• Vacuum pump won't start.
• A function does not start or finish a pro-
cess.
2. Do not replace the power board for these
issues:
• Display has lines, missing characters,
etc.
• Repeated read errors.
• Repeated communication errors.
• Display is blank at power up and contrast
can't be adjusted and power has been
verified.
The best way to troubleshoot is to go into the
diagnostic menu:
• If you are able to switch a solenoid or
relay on and off, the output portion of the
board is likely okay.
• If the fan, compressor, or vacuum pump
is selected it should receive power.
Pressures can be verified with a gauge at the
accumulator port, low side hose and by access-
ing the tank. The tank pressure transducer can
be checked by charging a hose and comparing
to the low side transducer or the gauges. They
should be reasonably close initially, but the
gauge or low side reading should drop quickly
if the tank is warm.
SP00D00517 2018-07-11

Control Board Troubleshooting

1. Possible reasons to replace controller:
• Repeated read errors.
• Repeated Communication errors.
• Keys don't read (after verifying keypad).
Do not reflash controller unless updated
software is required or a TSB indicates
the need.
2. Do not replace the control board for these
issues:
• A solenoid will not open.
• A motor won't start.
• Scale is out of calibration, (overcharge/
undercharge etc).
• The display is dim or dark (unless it can
not be adjusted).
• A pressure reading is wrong.
• High pressure, air purge time out, etc.
• A function doesn't start or complete (Re-
covery, Charge Tank Fill etc).
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ACS 561 Service Manual
Robert Bosch GmbH