Bosch RG8.0 Repair Instructions

F 002 DG9 H10 2018-08-21| Bosch Automotive Service Solutions GmbH
Troubleshooting | RG8.0 / RG4.0 | 11
en
5.2.4 Of capacitors
1. Execute the steps listed in chapter 3.1.
2. Unfasten the screws of the LH and RH enclosures
(Fig. 3, Pos. 6, 18) / (Fig. 4, Pos. 6, 19).
! Do not touch the capacitor with bare hands. Wear
appropriate PPE.
3. Disconnect the electrical connections to the capacitor.
4. Check whether the capacitor has cracked.
 If there are cracks, replace with a new capacitor.
i To safely discharge a capacitor, place a
20,000 Ω, 2 W resistor across the capacitor terminals
for 5 seconds.
5. Remove the capacitor from the circuit and discharge.
6. Check the capacitance value using a multimeter.
"If the measured value is within  20% of the rated
value, the capacitor is in good condition. Else, re-
place the capacitor.
5.2.5 Of motor
! The RG8.0 / RG4.0 motors are equipped with auto-
matic reset type thermal switch. If the motor stops
functioning due to overheat, it can automatically
restart at any time. Ensure that electrical supply to
the motor is isolated before repair.
1. Execute the steps listed in chapter 3.1.
2. Unfasten the screws of the LH and RH enclosures
(Fig. 3, Pos. 6, 18) / (Fig. 4, Pos. 6, 19).
3. Disconnect the electrical connections to the motor,
start relay and capacitors.
4. Visually, inspect the motor for damages. Replace the
motor if :
$ It is burnt.
$ The shaft is jammed.
$ If there are any other signs of damage.
5. Using a multimeter, check continuity between the
following motor terminals.
$ RG8.0, 230 V - Blue to blue
$ RG8.0, 110 V - Blue to blue
$ RG4.0, 230 V - Blue to orange and orange to black
$ RG4.0, 110 V - Blue to orange and orange to black
 If there is no continuity, replace the motor.
6. Using a multimeter, check winding resistance be-
tween the following motor terminals:
Variant Main winding Auxiliary winding
RG8.0 230 V Yellow - Brown Yellow – Purple
RG8.0 110 V Yellow - Brown Black - Red
RG4.0 230 V Blue - Orange Black – Orange
RG4.0 110 V Blue - Orange Black – Orange
 If the reading is 0, it indicates a short circuit. If
the reading is infinity, it indicates an open circuit.
In either case the motor should be replaced.
i Additionally, check the resistance between black to
black and red to yellow. If the multimeter reads any
value other than infinity, there is a short circuit
between windings and the motor should be
replaced.
7. Check the resistance between the motor body / cas-
ing and each terminal of the motor.
 If the meter reads any value other than infinity,
it indicates a short circuit between the windings
and the motor should be replaced.
5.2.6 Of power switch
1. Execute the steps listed in chapter 3.1.
2. Unfasten the screws of the LH enclosure
(Fig. 3, 4, Pos. 6).
3. Disconnect the electrical connections to the power
switch.
4. Perform the checks as listed in the following table:
Switch
position
Check
continuity
between...
Observed result Action
0
R/L1 - U/T1
Continuity exists
Replace
switch
R/L1 - V/T2
R/L1 - S/L2
S/L2 - V/T2
1
R/L1 - U/T1
Does not exist
S/L2 - V/T2
R/L1 - V/T2
Continuity exists
R/L1 - S/L2

Bosch RG8.0 Specifications

General

Brand	Bosch
Model	RG8.0
Category	Test Equipment
Language	English