Brother RH-9820 Service Manual page 220

8. ELECTRICAL MECHANISM
Problem #1 The power indicator does not illuminate when the power is turned on.
Cause
3. Malfunction of power cord
4. Blown fuse
5. Malfunction of power supply
motor P.C. board
6. Malfunction of main P.C. board
7. Malfunction of panel P.C. board
211
Inspection/Remedy/Adjustment
Disconnect connector P9 (ACIN) on the power
supply motor P.C. board from the circuit board,
turn on the power, and then measure the voltage
between pins 3-4 of the cord-side connector.
OK if same as wall outlet voltage
After inspecting, turn off the power and insert
connector P9.
4880Q
Remove fuses F7 and F8 and check the
continuity.
OK if continuity
(If there is no continuity, replace the fuse and
then carry out the inspections in 5. )
Disconnect connector P17 (M-MOTOR) of the
main P.C. board, turn on the power, and then
measure the voltages between the pins at the
cord-side connector.
OK if the voltages are as shown in the table
below.
Pin Nos.
+ side
1
2
6
7
After measuring, turn off the power, wait 5
minutes or more and then insert P14.
5085Q
With connector P17 (M-MOTOR) inserted into
the main P.C. board, turn on the power and then
measure the voltages between the pins at the
cord-side connector.
OK if the voltages are as shown in the table
below.
Pin Nos.
+ side
1
2
6
7
After measuring, turn off the power.
5085Q
Check that connector P1 (PANEL) is inserted
into the main P.C. board, and that connector
CN5 (MAIN) is inserted into the panel P.C.
board.
Normal
− side voltage
3 +5V
4 +5V
5 +24V
5 +24V
Normal
− side voltage
3 +5V
4 +5V
5 +24V
5 +24V
RH-9820
Replacement if a malfunction
Glass tube fuse
15A-250V
Power supply motor
board
Main P.C. board
Panel P.C. board
Panel harness
P.C.