Sharp R21lcf Service Manual

R21LCF
10 – 1
R21LCFService Manual CHAPTER 10. PRECAUTIONS FOR USING LEAD-FREE SOLDER
[1] Employing lead-free solder
The Main PWB of this model employs lead-free solder. This is indicated by the LF symbol printed on the PWB and in the servi ce manual. The suf-
fix letter indicates the alloy type of the solder.
Example:
[2] Using lead-free wire solder
When repairing a PWB with the LF symbol, only lead-free sol der should be used. (Using normal tin/lead alloy solder may result  in cold soldered
joints and...

R21LCF
11  –  1
R21LCFService Manual CHAPTER 11. COMPONENT REPLACEMENT AND ADJUSTMENT PROCE-
DURE
[1] WARNING
Please refer to “OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS,  DOOR PARTS”, when carrying out any of the following removal proce-
dures:
[2] OUTER CASE REMOVAL
To remove the outer case, procedure as follows.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the five (5) screws from rear and along the side edge of
case.
4. Slide the entire case back about...

R21LCF
11  –  2
6. Disconnect the main wire harness from the power transformer.
7. Remove the two (2) screws and two (2) VCP caps holding thetransformer to base plate. 8. Remove the transformer.
9. Now the power transformer is free.
[4] HIGH VOLTAGE RECTIFIER ASSEMBLY
 AND HIGH VOLTAGE CAPACITOR REMOVAL
To remove the components, proceed as follows.
1. Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect H.V....

R21LCF
11  –  3
                    Figure C-1. Oven lamp socket
[8] POSITIVE LOCK  CONNECTOR (NO-CASE TYPE) REMOVAL
1. Disconnect the power supply cord, and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Push the lever of positive lock
® connector. 
5. Pull down on the positive lock
® connector.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK
® CONNEC-
TORS TO THE TERMINALS, NSTALL THE POSITIVE
LOCK
® SO THAT THE LEVER FACES YOU....

R21LCF
11  –  4
[11] POWER SUPPLY CORD REPLACEMENT
1. REMOVAL
1. Disconnect the power supply cord and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Remove the one (1) screw holding the green wire to the cavity rearplate.
5. Disconnect the wire leads of t he power supply cord from the noise
filter.
6. Release the power supply cord from the oven cavity rear plate.
7. Now, the power supply cord is free.
2. REINSTALL
1. Insert the moulding cord stopper...

R21LCF
11  –  5
2. REINSTALL
1. Re-install each switch in its place. The door sensing switch and
monitor switch are in the lower position and the secondary interlock
switch is in the upper position. 2. Re-connect wire leads to each switch. Refer to pictorial diagram.
3. Secure latch hook (with two (2) 
mounting screws) to oven flange.
4. Make sure that the monitor switch is operating properly and check continuity of the monitor circui t. Refer to chapter Test Procedure
and Adjustment procedure.
[13]...

R21LCF
11  –  6
DOOR HANDLE REMOVAL
13.Release the latch spring from the tab of the latch angle assembly.
14.Remove the two (2) screws holding the door handle and the latchangle assembly through the door frame.
15.Now, door handle is free.
LATCH HEADS REMOVAL
16.Remove the one (1) screw holding the latch angle assembly to the door frame.
17.Remove the latch angle assembly together with the latch lever, latch spring and the upper and lower latch heads from the door
frame.
18.Release the latch lever...

R21LCF
11  –  7
                            Figure C-8. Antenna Motor Shaft Removal
2. INSTALLATION
1. Install the antenna motor shaft into the hole of the oven cavity bot-tom plate, and turn the flat faces of antenna motor shaft to the left
and right side walls of oven cavity (to fit the stirrer antenna holder).
Refer to Figure C-9.
2. Set the direction of the stirrer antenna and antenna holder so that the hole of the antenna holder fit to the centre of the stirrer
antennas big blade. Refer to Figure...

R21LCF
11  –  8
6. Push down the rear edge of the ceramic shelf into the oven cavitybottom plate.
7. Now, the ceramic shelf is installed.
WARNING: Make sure that the rubber packing is not caught
between the oven door and the oven cavity front plate,
to avoid possible exposure to excessive microwave
energy.
Rear Edge
Push
Front E dge
Ceramic
Shelf
Oven C avity 

R21LCF
12 – 1
R21LCFService Manual CHAPTER 12. CIRCUIT DIAGRAMS
[1] Pictorial Diagram (Figure S-1)
Figure S-1. Pictorial Diagram
FUSE
RED
BLK
L
N
WHT RED
WHT
WHT
OR GGR Y
THE R MAL
CUT-OUT
125û
C(OVEN)
OVE N LAMP
&SOCKET
THE R MAL
CUT-OUT
145¡ C (MAG .)
FAN MOTOR
WHT
OR G
WHTREDWHT
HIG H VOLTAG E C OMP ONE NTS
MAG NE T R O N
H.V.
CAPACITOR
H.V.
R E C T IF IE R
POWER TRANSFORMERGR N
POWER SUPPLY
CORD
COM
WHTWHT
OR G
WHTWHT
N.C . N.O.
COM.
CONNECTOR
OR GOR G
WHT
BLUBR N
ANTE NNA
MO T O R
MO NMIT O R...