Will Not Power-Up, No Display - Bosch ACS 561 Repair Instructions

Diagnostics and Testing

Will Not Power-Up, No Display

1. Verify the unit is connected to a known good
power source with a good ground, and not
through an extension cord.
2. Verify the power cable is wired correctly,
and the connector has not been damaged.
Replace or repair as required.
3. If unit does not power up, check if the circuit
breaker has tripped.
4. Turn on the main power switch.
5. If the display does not activate, verify line
voltage is present at the input and output
terminals of the switch.
• If line voltage is not present at power
switch input, check connections between
power switch and AC connector.
• If line voltage is present at power switch
input, but not at output with switch turned
on, replace power switch.
• If line voltage is present at both input and
output of switch, proceed to next step.
Circuit Breaker Not Tripped
1. Turn off unit and disconnect AC power cord
from receptacle.
2. Check the circuit breaker for continuity.
• If there is no continuity, replace circuit
breaker.
• If there is continuity, continue to next step.
Before replacing any component, make
sure the interconnecting harnesses are
in good condition and proper electrical
contact is made between the connec-
tors.
3. Perform the following continuity checks:
a. Disconnect the cable from power sup-
ply PSJ1.
b. Jumper all input power cable pins to-
gether at the plug end.
4. Connect the unit to a proper AC power
source and place the unit power switch on.
The display should illuminate. If the unit is
still inoperative, perform the following volt-
age checks.
a. Measure the voltage at the output of the
power supply from PSJ2 pin 2 (+) to pin
3 (-). Voltage should be 12VDC.
• If 12Vis not present, go to step 5.
• If 12V is present, replace control board.
SP00D00517 2018-07-11
5. Connect the unit to a proper AC power
source and place the unit power switch on.
a. Disconnect the cable from power board
PBP4.
b. Measure the voltage at PBP3 pins 2
and 3.
• Voltage should be 207 to 241VAC. If
voltage is correct, replace power sup-
ply.
• If voltage is less than 207VAC, replace
power board.
Circuit Breaker Tripped
1. Place unit power switch off and reset the
circuit breaker.
2. Place unit power switch on. If the circuit
breaker remains engaged, the unit should
operate normally and no further action is
required. Otherwise, proceed to step 3.
3. If the circuit breaker trips again after being
reset, place the power switch off.
4. Connect PBP3 and disconnect remaining
connectors from the power board.
5. Place unit power switch on.
6. If the reset circuit breaker trips again, re-
place the power board.
7. If the circuit breaker doesn't trip after being
reset, place the power switch off.
8. Connect one connector at a time into the
power board, placing the power switch on
after each additional connection.
9. Perform step 8 until the circuit breaker trips
when placing the power switch on.
10. Check all components associated with the
last connector to be attached to the power
board when the power switch was placed
on.
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ACS 561 Service Manual
Robert Bosch GmbH