ACS 553, ACS 563 Service Manual
1 689 975 295 2021-04-13Robert Bosch GmbH
57
Electrical
The Control Board, Figure 3-3, is mounted in
the control panel and provides the control for
the entire operation of the unit based upon the
signals from sensors, transducers, and manual
operator inputs via the keyboard.
See Figure 3-3 for connector locations.
J1: Power Board J1
P1: Air Flow Sensor (disabled on R134a)
P6: Accumulator Pressure Transducer,
Low-Side Pressure Transducer and ISV Tank
Temperature Sensor.
P13: USB Port
P15: Printer Power (if present)
P17: Keypad
P19: 12 VDC from Power Board P2
The Control Board (CB) receives power from
the Power Board PBP2 to CBP19. This voltage
is used to power the sensor circuits, processors,
and is provided as an output signal to the Power
Board to energize manifold solenoids, and the
compressor and vacuum pump relays.
5 VDC, and 3.3 VDC provide the power for the
logic and data circuitry. A fourth regulated power
source supplies voltage to the optional printer.
P6
P13
J8
P17
J1
P19
P18 P15
P8
P16
P1
1. Reads Keypad
• If a key does not respond, it’s most likely
that:
1. it isn’t supposed to respond at that
time
2. the keypad is faulty (replace keypad)
3. Operates Display
• The display contrast changes with
temperature and light conditions.
• Always try to adjust the contrast before
Arrows).
• After adjustment, if there are missing
seg ments, characters, etc., in the lines
of the display, replacement is required.
4. Contains Programming
• Normally, if a unit runs at all, the program
does nothing unless a valid upgrade
program is available.
5. Communicates with USB ports.
• This occurs during software updates.
6. Contains calibration and other stored
variables
• Normally if a variable is corrupt an error
will appear.
• Never replace the control board to try to
correct a reading inaccuracy.
• If the calibration data is repeatedly
corrupt and causing calibration errors or
won’t hold calibration, the board could
be suspect.
7. Communicates with the Power Board
• Never replace the control board to correct
an input reading or output failure.
• If any part of the program works the
controller is not the problem (it will not
fail to operate any one output or input).
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