Sharp R-6R50 User manual

SHARP:
SERVICE
MANUAL
3681 8RERS50EHW
GRILL AND
MICROWAVE OVEN
MODELS R-6R50(W)/(B)
R-6G50(W)/(B
R-6G52(W)/(B)
Photo R-6R50(W) R -6R70(W) /( B)
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should BG ead
This is a supplemental Service Manual for Model R-6R50(W)/(B) etc.
Those models are quite similar to Base Model R-6G10(W)/(B) (Refer No. is SS809R6G10EHW).
Use this supplemental manual together with the Base Model Service Manual.
Refer
to
the
Base
Model
Service
Manual
for
complete
operation,
service
information,
etc.
sins
TABLE OF CONTENTS
FOREWORD
CAUTION, MICROWAVE RADIATION
PRODUCT DESCRIPTION
GENERAL INFORMATION
- OPERATION INSTRUCTIONS
OPERATION
SERVICING
TOUCH CONTROL PANEL ASSEMBLY ..
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
MICROWAVE MEASUREMENT PROCEDURE ..
PICTORIAL DIAGRAM
CONTROL PANEL CIRCUIT
PRINTED WIRING BOARD
PARTS LIST
PAGING AND ACCESSORIES
SHARP
CORPORATION

R-6G50(B)
R-6R50(W)
R-6R70(W)
R-6R50(B)
R-6R70(B)
R-6R50(W)/(B)
R-6G50(W}/(B)
R-6G62(W)/(B}
R-6R70(W)/(B)
SERVICE MANUAL
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SHARP
PRODUCT
DESCRIPTION
GRILL AND MICROWAVE OVEN
R-6R50(W)/(B)/ R-6G50(W)/(B)/ R-6G52(W)/(B)/
, R-6R70(W)/(B) |
FOREWORD
This Manual has been prepared to provide Sharp Corp. Service
Personnel with complete Operation and Service Information for
the SHARP GRILL AND MICROWAVE _ ovens,
R-6R50(W)/(B)/ R-6G50(W)/(B)/ R-6G52(W)/(B)/
R-6R70(W)/(B). =
The Models —_—- R-6R50(W)/(B)/ R-6G50(W)/(B)/
R-6G52(W)/(B)/ R-6R70(W)/(B) are quite similar to Base
Model R-6G10(W)/(B) (Refer No. SS809R6G10EHW).
It is recommended that service personnel carefully study the a
entire text of this manual and Base Model manual, so they will i TOUCH CONTROL PANEL
be qualified to render satisfactory customer service. /! ASSEMBLY
Check interlock switches and door seal carefully. Special at-
tention should be given to avoid electrical shock and microwave
radiation hazard.
COMPONET REPLACEMENT
AND ADJUSTMENT
(RD36102U)
-- CAUTION |
MICROWAVE RADIATION oo
MICROWAVE
Personne! should not be exposed to the microwave energy ‘MEASUREMENT
which may radiate from the magnetron. or other microwave
generating devices if it is improperly used or connected. All
input and output microwave connections, waveguides,flanges |
and gaskets must be secured. Never operate the device without
a microwave energy absorbing load attached. Never look into
an open waveguide or antenna while the device is energized.
WIRING DIAGRAM
Note(Parts List) : The parts marked ”*” are used in voltage
more than 250V. ;
” 7 (nDaez02U) PARTS LIST
€
|
| _ SHARP CORPORATION
in OSAKA, JAPAN

ITEM
Power Requirements
Power Consumption
Power Output
Grill Heating element
Power Output
Case Dimensions
Cooking Cavity Dimensions
Turntable diameter
Control Complement
set Weight
PRODUCT DESCRIPTION
SPECIFICATION
DESCRIPTION
220 Volts
50 Hertz
Single phase, 3 wire earthed
Microwave cooking 1.25 kW
Dual cooking 2.55 kW (Except R-6R50)
Grill cooking 1.35 kW
_ 600 watts nominal of RF microwave energy (2 ner water load)
Operating frequency of 2450MHz
1.3 kW
Width 520 mm
Height 341 mm mnelpeine foot
Depth 416 mm
Width 340 mm
Height 203 mm
Depth 350 mm
330mm
Touch Control System
Clock( 1:00 - 12:59 )
Timer (0 - 99 min. 99 sec. )
Microwave Power for Variable Cooking
Repetition Rate;
FULL: POWER®. -wsssazeesraseazace Full power gusuanaut the cooking time
ROA cetierersittrcasscetecsei ve cocascvcnecs Sctaab asics approx. 70% of Full-Power
SSIES” ‘evianshiniewei canes vertveeiveaseoetecieveseacaas approx. 50% of Full Power .
DEFROST | - sasticsaiccedunediceeivestennnnieacetires: approx. 30% of Full Power
von ss aate dba aaa dewearere Sadie Calpeata seukeiite site: approx. We of Full Power
(FUNCTION.
a ae Pads | ann med a |
Dual Pads
Gril! cooking
Rotisserie Pad’ -
Easy Defrost pad .
Less / More pads
kg / Pes pad
g pad | a
Timer / Hold pad a on
| Auto Start / Clock pad sa as ae naa
Stop / Clear pad
Minute Plus / Start pad ae Wa
Numeral keys : 10min. 1min. 10sec.
Approx. 23 kg
TE: . Numbers and letters shown after sentences such as “RD44101U” are for factory use only.
2
tt Hn
(RD44101U)
eae
{i
"
GENERAL INFORMATION
WARNING
THIS APPLIANCE MUST BE EARTHED
IMPORTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:
: EARTH
: NEUTRAL -
: LIVE -
.GREEN-AND-YELLOW
BLUE
BROWN
OPERATING INSTRUCTIONS
R-6G50,. R-6G52 . R-6R50, R-6R70 : ’
dior
Waveguide
cover
Oven lamp
Access caver for oven lamp
replacement
. Ventilation openings
. Grill heater unit (See page E-19)
Qven door with see-through window
Doar latches
Hinges
. Roller stay
Removable turntable
Low rack (50 mm}
. High rack (135 mm)
. Door open button{ VW}
. Auto-Touch control panel
. Digital readout
. Skewer (R-GR50, R-GR7O only}
17. Prongs (R-6R50, R-6R70 only)
18. Skewer support {R-6R50, R-6R70 only) .
19, Handles (R-6R50, R-6R70 only)
ahs
es
ANMAWNAObDI]GAHD
NOTES:
THE SKEWER SUPPORT IS FOR ROTISSERIE COOKING ONLY.
AFTER ROTISSERIE COOKING 1S FINISHED, REMOVE THE SKEWER SUPPORT AND STORE WITH OTHER
ACCESSORIES.
G@) Time pad ; EASY DEFROST pad
Grill syrnbol Indicators @ MICROWAVE pad MORE/LESS pad
AE ee Sa ee ee eee ee. @. GRILL pad... @ - Weight pad
Microwave and Defrost. Digital display @ DUAL COOK pad @ TIMER/HOLD pad
can @ ROTISSERIE pad - @ AUTO STARTICLOCK pad
Rotisserie symbo! (A-GRSO, Indicators ® Menu Guide @ - STOP/CLEAR pad
@ COMPUCOOK pad @ MINUTE PLUS/START pad
R-6R70 only)
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R-6G50(W)
R-6G52(W)
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OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions
during oven operation.
(RD74101L)
OFF CONDITION
Closing the door activates all door interlock switches :
ist latch switch, 2nd latch switch, heater switch and
stop switch (In this condiction, the monitor switch
COM-INC contacts are opened.)
When oven ts plugged in, 220 volts A.C. is supplied to
CPU unit. (Figure 0-1)
The display will show blashing “88:88”.
To set any program or set the clock, you must first
* touch ' (stop/clear) pad. The display will clear,
and 1:00 will appear and count up every minute.
NOTE: When the door is opened, the oven lamp comes
on.
COOKING CONDITION
FULL POWER COOKING
Program desired cooking time and Variable Cooking
Control by touching the time pads and (
MICROWAVE ) pad. When the (MINUTE
PLUS/START) pad is touched, the following oper-
ations occur:
1. The contacts of relays are closed and components
connected to the relays are turned on as follows.
(For details, refer to Figure O-2)
RELAY CONNECTED COMPONENTS
RY-1 Oven lamp/Turntable motor
RY-2 Power transformer
RY-4 Fan motor.
' RY-5 Rotisserie motor
Note: (1)The surge relay (not shown above table)
comes on only for 200 mili seconds directly
after ‘MINUTE PLUS/START‘ pad touched,
with closing its contacts. After that, the surge
relay is. de-energied. and .its. contacs. are.
opened.
(2)The relay RY-5 is provided to Model R-GR50-
and R-6R70 only.
The rotisserie motor is activated only at the
(ROTISSERIE) pad is touched
befor touching the -
~ (MINUTE PLUS/START) pad,
2. 220 volts A.C. is supplied to the primary winding
of the power transformer and is converted to about
3.3 volts A.C. output on the filament winding, and
approximately 2000 volts A.C. on the high voltage
winding.
3. The filament winding voltage heats the magnetron
filament and the H.V. winding voltage is sent to a
voltage doubler circuit.
4, The microwave energy produced by the magnetron
is channeled through the waveguide into the cavity -
feed-box, and then into the cavity where the food
is placed to be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The
oven will revert to the OFF condition.
6. When the door is opened during a cook cycle, the
switches operate as following.
2 ia
|
|
|
|
|
Switch Contact During Door
Cooking Opened
1st Latch Switch COM-NOQ Closed Open
2nd Latch Switch COM-NO Closed Open
Heater Switch -COM-NO Closed Open
Stop Switch COM-NO Closed Open
Monitor Switch COM-NC Open Closed
COM-NO Closed Open
The circuits to the turntable motor, the cooling fan
motor, the rotisserie motor (for R-6R50 and
R-6R70), and the high voltage components are
‘ deenergized, the oven lamp remains on, and the
digital readout displays the time stiJl remaining in
the cook cycle when the door is opened.
7. The monitor switch ts electrically monitoring the
operation of the ist latch switch and is mechan-
ically associated with the door so that it will func-
tion in the following sequence.
(1) When the door opens from a closed position,
the tst latch switch open that contacts, and
then the monitor switch contacts (COM-NC)
close.
(2) When the door is closed ae the open posi-
tion, the monitor switch (COM-NC) contacts
first open, and then the contacts of the 1st latch
switch close.
If the 1st latch switch fails with its contacts closed
when the door is opened, the closing of the monitor —
switch contacts (COM-NC) wili form a short circuit
through the fuse, 1st latch switch, causing the monitor
fuse to blow.
ROAST, SIMMER, DEFROST, WARM COOKING
When Variable Cooking Power ts programed, the 220
volts A.C. is supplied to the power transformer ~
intermittently through the contacts of relay(RY-2)
which is operated by the control unit within a 32 sec-
ond time base. Microwave power operation is as fol-
lows:
VARI-MODE ON TIME OFF TIME
FULL POWER . 32 sec. O sec.
(100% power)
ROAST 24 sec. 8 sec.
(approx. 70% Jeet
SIMMER 18 sec. 14 sec.
(approx. 50% power)
DEFROST 12 sec. 20 sec,
(approx. 30% power}
WARM , 6 sec. 26 sec.
(approx. 10% power)
Note: The ON/OFF time ratio does not correspond
with the percentage of microwave power, be-
cause approx. 2 seconds are needed for heating
of the magnetron filament.
EASY DEFROST COOKING
The EASY DEFROST key is a special function key to
defrost meats and other food faster and better.
EASY DEFROST automatically defrosts foods.
This key has 4 defrost stages.
When the food weight is entered by using the weight
pads, the oven will cook according to the special
cooking sequence, refer to Easy Defrost Chart on Op-
eration Manual.
GRILL COOKING CONDITION
In this condition the food is cooked by grill heating
element energy.
Program desired cooking .time and grill mode by
~ touching the time pad and (GRILL) pad.
When the (MINUTE PLUS/STAR) pad is
touched, the grill heating element etc. come on by ac-
tivating the relays, refer to Figure O-3 for details.
Note:
(1)For relay RY-5, refer to ‘Note’ of *Full Power Cook-
ing’ section,
(2)The relay RY-4 contacts hold ON-condition and the
fan motor rotate for one minute after completion of
the grill cooking or dual cooking, and if the tem-
perature of the cooling thermal cut-out is higher
than 100 °C, the fan motor continues to rotate until
the temperature of the thermal cut-out becomes
lower than 80 °C.
DUAL COOKING CONDITION
(Model R-6G50,-6G52,-6R70)
In this condition the food is cooked by both microwave
energy and grill heating element energy simultane-
ously. Program desired cooking time and dual cooking ~
mode by touching the time pad and the (DUAL
COOK) pad.
When the (MINUTE PLUS/START) pad is
touched, the magnetron and the grill heating element ©
etc. come on by activating the relays, refer to Figure
O-5 for details.
COMPU COOK CONDITION |
COMPU COOK automatically selects the cooking
mode and compute the cooking timé for baking,
roasting and grilling. It is based on specific foods and
the quantity or weight of the food.
Program the COMPU COOK mode by touching
the (COMPU COOK) pad, enter the weight.
of the food by touching the or (weight)
pad or enter the quantity of the food by touching the
(weight) pad, and touch (MINUTE
PLUS/START) pad.
The oven will generate the microwave energy and/or
grill heating energy according to the programed special
cooking sequence.
R-6R5O(V
R-6G50(¥
R-6G52(¥
R-6R70(V

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1ST LATCH SWITCH
Operation is as follows.
1. When the door is closed, the lower latch head
snaps down above the switch lever.
2. When the lower latch head pushes the switch lever.
The switch lever now depresses the plunger of the
switch closing its COM-NO contacts (ON condi-
tion).
3. When the open button is pressed, it pushes the
open lever. The open lever raises the switch lever
raising the Jower latch head.
As that time, the switch lever is released from the
piunger of the, 1st latch switch. The switch lever
is returned to its original position.
Now, the COM-NO contacts of the switch opened
(OFF condition).
2ND LATCH SWITCH
The switch is activated by the upper latch head on the
door,
When the door is opened, the switch interrupts the .
circuit to the magnetron or heating element etc., refer
to Oven Schematic Diagram for details.
STOP SWITCH
The switch is activated by the upper latch head.
The contacts are opened at the door opened and the
contacts are closed at the door closed.
MONITOR SWITCH | .
The monitor switch is activated (the COM-NC contacts
opened) by the lower latch head on the door while the
door is closed. The switch is intended to render the
oven inoperative by means of blowing the fuse(F6.3A)
when the contacts of the 1st latch switch fail to open
when the door is opened.
Function
1. When the door is opened, the monitor switch
COM-NC contacts close {to the ON condition) due ©
to their being normaily closed. At this time the 1st
latch switch is in the OFF condition {contacts
open) due to their being normally open contact
switches.
2. As the door goes to a closed position, the monitor
switch COM-NC contacts are first opened and then.
the 1st latch switch contacts close. (On opening
| the door, each of these switches operate inversely.)
3. If the door is opened, and the 1st latch switch
contacts fai] to open, the fuse blows simultane-
ously with closing of the monitor switch COM-NC
contacts.
CAUTION: BEFORE REPLACING A BLOWN FUSE
: TEST THE 7ST LATCH SWITCH AND
MONITOR SWITCH FOR PROPER OP-
ERATION.
(REFER TO CHAPTER “TEST PROCE-
DURE’),
NOISE FILTER UNIT
The- noise filter. unit prevents the radio-frequency: in- -. .
terference. And it has Fuse, refer to Oven Schematic
Diagram for kind of this fuse.
DESCRIPTION AND FUNCTION OF COMPONENTS
SURGE RELAY AND SURGE RESISTOR
Surge relay !s located on the relay mounting plate.
Surge resistor is located on the chassis support.
When the cooking start button is pushed at microwave
cooking or dual cooking condition, at first the surge
relay contacts close and the surge current flows
through the surge resistor. And then the surge relay
contacts open after approx. 200 msec.
The surge resistor puts down the surge current. If the
surge resistor is open or the surge relay does not op-
erate, the home breaker, home fuse, fuse 13A 250V or
fuse F6.3A 250V may break down when the cooking
Start button is pushed at microwave or dual cooking
condition.
ROTISSERIE COOKING SYSTEM .
All the surfaces of the food will be able to be grilled
uniformity by rotating the food which the skewer is
inserted into. ~
ROTISSERIE MOTOR
The rotisserie motor is located on the rotisserie motor
angle assembly which is located on the right side wall
of the oven cavity.
The skewer is rotated by the rotisserie motor through
the rotisserie motor angle assembly.
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rt ]e4 ig Y 1 ~ tateh
at! awilci)
“Se SS
| *— Switch lever
u
. Opon tavor
a) :
oy
59
Open bution
Figure D-1. Switch Operation
aa CAVITY
GRILL HEATING ELEMENT
FOOD
ROTISSERIE
OTO.
ASSEMBLY
COUPLING
ROLLER STAY ASSEMBLY
Figure D-2. Rottisserie Mechanism
10
R-6R50(V
R-6G50(\
R-6G52(\
R-BR70(V
SERVICING
TROUBLESHOOTING GUIDE
When troubleshooting the oven, it is helpfull to follow
the Sequence of Operation in performing the checks.
Many of the possible causes of trouble will require that
a specific test be performed. These tests are given a
procedure Jetter which will be found in the “Test Pro-
cedure” section.
IMPORTANT: If the oven becomes inoperative be-
cause of a blown fuse (F6.3A) in ist
latch & cook switch - the monitor
switch circuit, check 1st latch & cook
switch and the monitor switch before
replacing the fuse (F6.3A).
PROBLEM | POSSIBLE CAUSE | TEST PROCEDURE OR
CORRECTION
Home fuse blows when power
cord is plugged into wall recepta-
cle.
Fuse(13A 250v) blows when
power cord is plugged into wall
receptacle. (For R-6G50,
R-6G52, R-6R70)
Fuse F6.3A blows when power
cord ts plugged into wall recepta-
cle.
: 88:88 do not appear in diaplay
oa when power supply cord is
plugged into wail outlet.
Display does not operate properly
when (STOP/ CLEAR) pad
is touched.
OFF CONDITION
Shorted’ wire in power cord or wire har- | Replace cord or check wiring.
ness.
Shorted wire in wire harness.
Defective noise filter unit.
Defective monitor switch.
Shorted wire in wire harness. ~
Defective noise filter unit.(R-6R50only)
Defective touch control unit
Defective fuse 13A 250V.(For R-6G50,
R-6G52, R-6R70)
| Defective fuse F6.3A..
Defective magnetron thermal cut-out.
Defective noise filter unit.
Defective touch control unit
Defective stop switch.
Out of adjustment stop switch.
| Oven lamp does not light at door
opened.
No power at outlet.
Open wire in power cord or wire harness.
Blown fuse(F6.3A).
Blown fuse 13A 250V.(For
R-6G52, R-6R70)
Defective noise filter unit.
Defective stop switch.
Defective oven tamp.
Defective oven lamp socket.
Defective touch control unit
N ol an) <=
R-6G50,
Defective magnetron thermal cut-out.
Open or loose wire connection to
the
above components.
Check and repair harness, re-
place fuse(13A 250V).
Procedure M.
Procedure F.
Check and repair harness and
replace the fuse F6.3A. -
Procedure M.
Procedure P.
Check and replace fuse 13A
Procedure N.
Procedure H.
Procedure M.
. Procedure P.
Procedure E.
Adjust the stop switch.
Check wall outlet.
Replace or repair.
Procedure N.
Replace the fuse 13A 250V, ~
rocedure M,
rocedure E,
eplace oven lamp.
eplace oven lamp socket.
rocedure P,
rocedure H.
Replace or repair wiring. —
| |) 0)
|

-6RS50(W)/(B)
-6R70(W}/{B)
PROBLEM POSSIBLE CAUSE TEST PROCEDURE OR
CORRECTION
MINUTE PLUS/ START pad
is pushed, but the oven does not
operate at Dual cooking condi-
tion.
DUAL COOKING CONDITION
The oven can not operate at Grill cooking
condition.
The oven can not operate at Microwave
cooking condition.
Defective heater switch.
Refer to “GRILL COOKING
CONDITION’.
Refer to "MICROWAVE
COOKING CONDITION’,
Procedure J.
Procedure P.
check and repair wiring.
Defective touch control unit
Open or loose wiring to above compo-
nents.
MICROWAVE COOKING CONDITION
Oven lamp does not light.
Fan motor does not rotate when
MINUTE PLUS/ START pad
is touched.
Turntable motor does not rotate
when MINUTE PLUS/
START pad is touched.
(Oven lamp lights.)
Oven seems to be operating but
little or no heat is produced in
oven load. .
(Microwave cooking control is set
-|-at "FULL POWER” position.) .-.
Oven does not cook properly
when programmed for variabl
cooking powers. (Operates prop-
erly on HIGH)
Oven goes into cook cycle, but
shuts down before end of cycle.
MINUTE PLUS/ START pad
is touched.
Replace oven lamp socket.
Replace oven jamp.
Procedure P.
Replace or repair wiring.
‘Defective oven Jamp socket.
Defective oven lamp.
Defective touch control unit —
Open or loose wire connection to the
above components.
Defective fan motor. Replace fan motor.
Open or loose wiring to above compo- | Check and repair wiring.
“ | nents.
-Oven-stops as soon as when the
Defective touch control unit Procedure P.
Open or loose wire connection to the | Replace or repair wiring.
above components.
Open or loose wire connection to the
turntable motor, 1st latch switch or moni-
tor switch.
Defective turntable motor. Replace turntable motor.
Defective 1st latch switch. Procedure E.
Defective heater thermal Procedure H.
R-6R50 only)
Defective magnetron. :
Check and repair wiring.
cut-out. (For
Procedure A.
Procedure D.
Procedure B.
‘| Procedure P;
Defective high voltage capacitor.
Defective power transformer.
Defective touch control unit
Defective 2nd latch switch. Procedure E.
Defective heater switch. Procedure J.
Open or loose wiring to above compo- | Check and repair wiring
nents.
Defective touch control unit Procedure P.
Magnetron thermal cut-out is opened. — Procedure H.
Defective touch control unit Procedure P.
Fan motor stops ; Check and repair wiring.
Defective rectifier.
Defective high voltage rectifier assembly.
R-6R500)
R-6G50(!
R-6G52(1
R-BR70{\
PROBLEM POSSIBLE CAUSE TEST PROCEDURE OR
CORRECTION
GRILL COOKING CONDITION
When MINUTE PLUS/ | Defective grill heating element.
START pad is touched but grill | Defective touch control unit
heating
element
does
not
operate.
|
Defective
1st
latch
switch.
(R-6G50,
|
Procedure
E.
R-6G52,
R-6R70)
Defective 1st latch and 2nd latch switch. | Procedure E.
(R-6R50)
Defective heater socket. Replace heater socket.
Defective heater switch,
Defective heater thermal cut-out.
Open or loose wire connection to above | Check or repair wiring.
components.
The two terminals of grill heater unit does | Check and fit the two termi-
not fit into the heater socket. nals of grill heater unit into
the heater socket, referring
"TO INSTALL THE GRILL
HEATER UNIT”.
Defective touch control unit Procedure P.
Defective oven lamp socket. Replace oven lamp socket.
Defective oven lamp. Replace oven lamp.
Open or loose wire connection to the | Replace or repair wiring.
above components.
Oven lamp does not light.
13

|
3-BASO(W)/(B}
R-6R50(
3-6G50(W)/(B}
.
R-6G50{
2-6G52(W)/(B}
t-BR70(W)/(B)
.
,
R-6R70(
PROBLEM
_
POSSIBLE
CAUSE
TEST
PROCEDURE
OR
TEST
PROCEDURES
CORRECTION
:
fee
PROCEDURE
a.
LETTER
COMPONENT
TEST
GRILL
COOKING
CONDITION
(CONT’D)
|
a
F
MONITOR
SWITCH
TEST
|
Disconnect
the
oven
from
the
power
supply.
sae
at
switch
Defective
fan
motor.
Replace
fan
motor.
;
i ‘
RcteEuvetauch
Golan
Procedure
P
Disconnect
the
wire
lead
from
NC
terminal
of
the
monitor
switch. Before
performing
this
test,
make
sure
i
.
the
1st
latch
switch is operating
properly
referring
to
Open or loose wire connection to the | Replace or repair wiring
above
components.
“Switch
Test
Procedure”,
Open
or
loose
wire
connection
to
the
|
Check
and
repair
wiring.
Connect
one
ohmmeter
lead
to
NC
terminal
of
monitor
turntable
motor,
1st
latch
switch
or
moni-
switch,
and
the
other
lead
to
COM
terminal
of
monitor
Defective
heater
thermal
cut-out.
(For
|
Procedure
H.
R-6R50 only)
tor
switch.
switch,
as
shown
figure.
When
the
door
is
opened,
the
meter
should
indicate
a
close
circuit.
When
the
plunger
of
monitor
switch
is
pushed
by
a
screw-driver
a
ey
Defective
1st
latch
switch.
Defective
turntable
motor.
Replace
turntable
motor.
Defective
touch
control
unit
through the latch hook hole on the front plate of the
Defective rotisserie motor assembly. Replace rotisserie motor
assrmbly.
oven cavity with the door opened, the meter should
Defective 1st latch switch.
indicate an open circuit. In case improper operation
Defective . heater thermal cut-out. (For | Procedure H.
R-6R50 only)
is indicated, replace the defective monitor switch. eae] At) ast latch
Defective touch contro! unit Procedure P.
Fan motor does not rotate.
2nd latch
switch
Heater
switch
Turntable motor does not rotate
when MINUTE PLUS/
START pad ts touched.
(Oven lamp lights)
The . rotisserie. motor . assembly
does not oprtate. (For R-GR50,
R-6R70)
After testing the monitor switch, re-connect the wire
lead to NC terminal of the monitor switch.
eed
L SURGE RELAY TEST
Disconnect the connector from the wire harness (main).
Afer stopped the grill cooking, the
fan motor does not rotate for more
than 1 minute. (During cooking,
it rotates)
When MINUTE PLUS/
START pad touched, but grilt
heating element stops it’s operate
soon (after about 10 minutes).
CONTACTS:
With 12 volts D.C. applied to the surge relay coil (1) and (6), a
check of contact with an ohmmeter should indicated (3) and (5)
sy contacts are closed.
} Without 12 volts D.C. applied to the surge relay coil (1) and (6),
tte an ohmmeter should indicate those contacts are opened. If im-
proper operation is indicated, replace the-surge relay. If proper
operation is indicated, check for loase on broken wire connections.
Procedure H.
Check fan blade, fan duct, fan
motor, air intake duct, partt-
tion plate, exhaust duct, and
ventilation openings.
Heater thermal cut-out is opened.
Thy
4 ta -
wre.
7 ny
=
COIL:
A continuity check of the surge relay coil should indicate approxi-
mately 160 ©. If the motor does not imdicate above ohms, replace
the surge relay.
15

PROCEDURE
TEST PROCEDURES (CONT'D)
COMPONENT TEST
NOISE FILTER UNIT TEST
Disconnect the oven from the power supply. Connect ohmmeter leads to connector N and L on
the noise filter unite, connector N and white terminal, or connector L and red terminal. And then
measure the each resistance. ;
N og
WINE CAOSS CAPACITOR ,
O,22u/AC2G0V
! Gaoksonw
LINE BYPASS CAPACITOR LINE BYPASS CAPACITOR
0.0047 fAC250V B07 WACO
10M/0,5W
LINE CROSS CAPACITOR
0,1p/AC250V
1.665/0,5M
LINE BYPASS CAPACITOR
0.0033 ,)/AC250¥
LINE BYPASS CAPACITOR
G.0033 pfaczsoy
VOM/IDL BW
Or rr Oe ere Gn a a er Ge SS pe cD ay
R-6R50 R-6G50/6G52/6R70
MEASURING POINTS INDICATION OF OHMMETER
Between connector N and L - R-6R50: Approximately 1.5M Q
R-6G50/6G52/6R70: Approximately 680k Q
lf the ohmmeter does not indicate above resistance, replace the noise filter unit. In case the
ohmmeter indicates open circuit when testing between connector L and terminal RED, check the
fuse on the noise filter unit. If the fuse blows, replace it.
TOUCH CONTROL PANEL ASSEMBLY TEST
The touch contro] panel consists of circuits including semiconductors such as LSI, ICs, etc.
Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with
only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is di-
vided into two units, Control Unit and Key Unit, trouble shooting by unit replacement is de-
scribed according to the symptoms indicated.
1. Key Unit.
The following symptoms indicate a defective key unit. Replace the key. unit.
a) When touching the pads, a certain pad produces no signal at all.
_ b) When touching a number pad, two figures or more are displayed. _
c) When touching the pads, sometimes a pad produces no signal.
2. Control Unit 2:
The following symptoms indicate a defective control unit. Replace the contro! unit.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators ;
a) Ata certain digit, all or some segments do not light up.
b) Ata certain digit, brightness is low.
c) Only one indicator does not light up. ©
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears. .
f) Accertain group of indicators do not light up.
g) The figure of all digits ficker.
2-3 Other possible troubles caused by defective control unit.
a) Buzzer does not sound or continues to sound.
_b) Clock does not operate properly.
¢) Cooking is not possible.
d) Proper temperature measurement is not obtained.
(RD82802U)
16
PROCEDURE
| 4. | Pattern at “a” and “b” are broken.
R-6R50(W)/(B
R-6R70(W)/(B
TEST PROCEDURES (CONT’D)
COMPONENT TEST
RELAY TEST
Remove the outer case and check voltage between Pin Nos. 5(7) and 7(9) of the 7(9)-pin
connector A on the contro! unit with an A.C. voltmeter.
The meter should tndicate 220 volts, if not check oven circuit.
Shut-off,Cook and Heater Relay Test
These relays are operated by D.C. voltage.
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking or grill
cooking operation.
DC. voltage indicated a... Defective relay. Be a:
DC. voltage not indicated ........ Check diode which is connected to the relay coll. If diode is
good, contro! unit is defective.
RELAY SYMBOL OPERATIONAL CONNECTED COMPONENTS
VOLTAGE
avi
aYS (HEATER)
oz
RYS
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD(PWB) IS OPEN.
To protect the electronic circuits, this model is provided with a fine foil pattern added to the
primary on the PWB, this foil pattern serves as a substitute coil. If the foil pattern is open, follow
the troubleshooting guide given below for repair.
Problem: POWER ON, indicator does not light up.
TEPS| OCCURANCE CAUSE OR CORRECTION
1 The rated voltage is not applied to POWER terminal | Check supply voltage and oven power cord,
|of CPU connector (CN-A) ;
2 The rated voltage is applied to primary side of pawer | Power transformer or secondary circuit defective.
transformer. : ~ | Check and repair. vax?
Only pattern at “a” is broken. *Insert jumper wire 1 and soijder.
.|*tnsert the coil RCJLF2003YAZZ between. "c” and|... ..—
NOTE:* At the time of these repairs, make visual in-
spection of the varistor for burning damage
and examine the transformer with tester for the
presence of layer short-circuit (check primary
coil resistance).
Hf any abnormal condition is detected, replace
the defective parts.
({RDB2X04L))
17

1-6RS50(W)/(B}
1-6 GSO(W)/(B)
1-6G52(W)/{B)
t-GR70(W)/(B}
TOUCH
CONTROL
PANEL
ASSEMBLY
OUTLINE
OF
TOUCH
CONTROL
PANEL
(R-6R50/R-6R70)
The touch control section consists of the following units as
shown in the touch control panel circuit.
{1} Key unit
(2) Control unit
The principal functions of these units and signal commun-
‘ic¢ated among them are explained below.
Key Unit
The
key
unit
is
composed
of
a
matrix,
signals
generated
in
the
LS!
are
sent
to
the
key
unit
through
P33—pP37.
When
a
key
pad
is touched,
a
signal
is
completed
through
the
key
unit
and
passed
back
to
the LSI
through
RO
—
R3
to
perform
the
function
that
was
requested.
Contro! Unit
Control unit consists of LSI (IZA153DR), power source
circuit, synchronizing signal circuit, ACL circuit, buzzer
circuit and indicator circuit.
1) LSI
This LSI controls the key strobe signal, relay driving signal
for oven function and indicator signal.
2)
Power
Source
Circuit
This
circuit
generates
voltages
[VC:
—5V,
VF1:
—28V,
VF2:
~26V,
VA:
—15V
and
Vp:
-34V]
necessary
in
the
contro}
unit.
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in order
to compose a basic standard time in the clock circuit,
It accompanies a very small error because it works on
commercial frequency.
4) ACL Circuit
A circuit to generate signals resetting the LSI to the initial
state when power is supplied.
5) Buzzer Circuit
_ The buzzer is responsive to signals from the LSI to emit
noticing sounds (key touch sound and compietion sound).
18
6)
Door Switch
A
switch
to
‘tell’
the LSI
if
the
door
is
open
or
closed.
Relay Circuit
To drive the magnetron, grill heating element, cooling fan
motor, rotisserie motor and light the oven lamp.
Indicator Circuit
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is triode having a cathode,
a grid and an anode.
is directly heated and the filament serves as
cathode,
The
Fluorescent
Display
6-digits,
15-segments
Display
Usually, the cathode of a Fluorescent
A- -BR7
DESCRIPTION OF LSI (R-6R50/R-6R70)
LS) (IZA153DR)
The
VO
signal
of
the
LSI
(IZA153DR)
is
detailed
in
the
following
table.
|
Pin.
No.
|
Signal
/o
Description
Reference voltage input terminal.
A
reference
voltage
applied
to
the
A/D
converter
in
the
LSI.
Connected to GND. (OV)
.
2
IN7
IN
Terminal
to
change
functions
according
to
the
model.
2
|
me
|
Signal
in
accordance
with
the
model
in
operation
is
applied
to
set
up
its
function.
Input signal which communicates the door open/close information to LSI.
'H” level signal (OV)
level signal (—5V)
4 INS IN
Door closed;
Door opened; “L’’
IN Terminal not used. Connected to GND.
Terminal to change functions according to the model.
9 INO IN
|
Signal
in
accordance
with
the
mode!
in
operation
is
applied
to
set
up
its
function.
cm, gr
fo
(
}
10
P47
OUT
Magnetron
high-voltage
circuit
driving
signal.
oa E
“Senn
To
turn
on
and
off
the
cook
relay
(RY2).
In
High
operation,
the
signals
holds
‘‘L’’
Jevel
during
microwave
cooking
and
’’H”
jevel
while
not
cooking.
In
other
cooking
modes
(MED
HIGH,
MED,
MED
LOW,
LOW)
the
|
signai
turns
to
“H"
Jevel
and
“L"’
level
in
repetition
according
to
the
power
level,
. : ON
é HIGH |
, ON
Lae ; a . MED HIGH 24 sec. | asec, |
a a oo . os. | OFF
OFF
ON :
, OFF
fe)
+H: GND
LOW
: ; N .
1
. :
:
Gaal
OFF
L
32 sec.
Oven lamp driving signal (Square waveform: ilala
To turn on and off shut-off relay (RY?).
|
The
square
waveform
voitage
is
delivered
to
the
RY1
driving
circuit
and
relays
{RY2,
11 P46 OUT
RY3 and surge} control circuit.
: | . 20 msec.
During cooking
19

16
17
18
19
20
ai
15 P42
P40
P36
P34
OUT
OUT
OUT
OUT
Key strobe signal.
Key strobe signal.
Description
Grill heating element driving signal.
To turn on and off the grill heater relay (RY3),
otherwise.
Cooling fan motor driving signal.
To turn on and off shut-off relay (RY4).
“HH level otherwise.
ON
During
capking
(Grill)
(i; GND
nF
“L" level during GRILL;
“H" Jevel
“1” tevel during both microwave and grill _
* GRILLIKG; The cocling fan motor relay is designed to turn off 1 min. later than the
grill relay.
Terminal not used.
Key strobe signal.
16 msec.
ROTISSERIE MOTOR driving signal.
To turn on and off shut-off relay (RY5). "L
"H” level otherwise.
During
OFF
on[ kr
During
on[ sete |
Surge limiting relay driving signal.
Signal applied to touch-key section.
OFF
H: GND
” fevel during both microwave and grill;
The surge limiting relay is designed to turn on 15 msec. earlier than the cook relay (RY2).
OUT
Apulse signal is input to RO — R3 terminal while one of G-9 line keys on key matrix
is touched,
Signal applied to touch-key section,
A pulse signal is input is RO —R3 terminal while one of G-8 line keys on key matrix
is touched.
Signal applied to touch-key section.
A pulse signal is input to RO —R3 terminal while one of G-7 line keys on key matrix
is touched.
Key strobe signal.
Signal applied to touch-key section,
A pulse signal is input to RO —R3 terminal while one of G-6 line keys on key matrix
is touched.
20
R-6G50(W}
Key strobe signal.
Signal applied to touch-key section.
A pulse signa! is input to RO —R3 terminal while one of G-5 hing keys on key matrix
is touched.
Signal to sound buzzer.
A : Key touch sound.
B_ : Completion sound.
C : When a’stage finishes for Compu Cook.
: 0,1 sec,
i
2 sec,
|
B:
y sec, sec, H: GND
Cc:
Peng
Signal synchronized with commercial power source frequency.
This is the basic timing for all time processing of LSI.
oe —— LI-5V)
ie
nn
20
msec.
|
Femina mete not used.
ac CNVSS a Ganaeéted to Ve.
Auto-clear terminal.
Signal is input to reset the LS! to the initial state when power is supplied.
Temporarily set to ““L” Jevel the moment power is supplied, at this time the LS} is reset. -
Thereafter set at ‘’H” level.
‘Internal clock oscillation frequency settinginput. =~ = =
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal,
Internal clock oscillation frequency contro! output.
Output to contro! osillation input of XIN.
Terminal! not used.
Power source voltage: —5V.
VC voltage of power source circuit input.
Signal coming from: touch-key.
When either one of G-1 line keys on key matrix is s touched, a corresponding signal out of
P33 — P37 will be input into R3.
When no key is touched, the signal is held at “’L” level.
21

Signal similar to R3.
When either one of G-2 line keys on key matrix is touched, a corresponding signal will
be input into R2.
Signal similar to R3.
When either one of G-3 line keys on key matrix is touched, a corresponding signal will
be input into R71.
Signal similar to R3.
When either one of G-4 line keys on key matrix is touched, a corresponding signal will
be input into RO.
Anode (segment) of Fluorescent Display light-up voltage: .—34V.
VP voltage of power source circuit input.
P1i7 - OUT Segment data signals.
The relation between signals and indicators are as follows:
Segment Signal Segment
br ee) OP Dk i
Le De Pd a i 2 A ee a a d
Cr Oe i a
A je i A Ss od
|
ee a ey
hot; i a os
ee ee ee eh he ee
Cr ee ee ee ey
Ce Y
Digit selection signal.
The relation between digit signal and digit are as follows:
Digit signal digit - Digit signal digit
PIG Sea ctkwe ee eee 00000 UPOF Seek cat, |
CP Do A Oe ee
8 V ae ee eT or ee 3rd PeOn i bee ae Rin oe Ce sours 6th
Normally, one pulse is output in every f&§ period, and input to the grid of the Fluorescent
Display.
----H
"8 {5OH2} | |
meek
22
a ee __ a
R-6R50(W)/(B
R-6G50(W)/{B
R-6G52(W)/{B
R-BR70(W)/(B
Segment data signal.
Signal similar to P17.
Digit selection signal.
Signal similar to P16.
Segment data signal.
Signal similar to P17.
Segment data signal.
Signal similar to P17.
Digit selection signal.
Signa! similar to P16.
Segment data signal.
Signal similar to P17.
Digit selection signal.
Signal similar P16.
Segment data signal.
Signal similar to P17.
Digit selection signal.
Signal similar P16.
Segment data signal. .
Signal similar to P17.
Digit selection signal.
Signal similar to P16.
Segment data signal.
Signal similar to P17.
Terminal not used.
60 OUT -
veep
sxe To
VSS IN
63
wait
Terminal for manufacture test. |
Connected to GND.
Connected to GND.
23

3-BA50(W)/(B)
3-6G50{W}/(B}
t-6G52(W)/(B)
1-6R70(W)/{B)
TOUCH
CONTROL
PANEL
ASSEMBLY
OUTLINE
OF
TOUCH
CONTROL
PANEL
(R-6G50/R-6G52)
The
touch
control
section
consists
of
the
following
units
as
shown
in
the
touch
control
panel
circuit.
{1) Key unit
{2) Control unit
The
principal
functions
of
these
units
and
signat
commun-
icated
among
them
are
explained
below.
Key Unit
The
key
unit
is
composed
of
a
matrix,
signals
generated
in
the
LS]
are
sent
to
the
key
unit
through
P33
—
P36.
When
a
key
pad
is
touched,
a
signal
is
completed
through
the
key
unit
and
passed
back
to
the
LSI
through
RO
—
R3
to
perform
the
function
that
was
requested.
Control
Unit
Control
unit
consists
of
LSI
(IZA1S53DR),
power
source
circuit,
synchronizing
signal
circuit,
ACL
circuit,
buzzer
circuit
and
indicator
circuit.
1) LSI
This
LS!
controls
the
key
strobe
signal,
relay
driving
signal
for oven function and indicator signal.
2) Power Source Circuit
This
circuit
generates
voltages
[VC:
—5V,
VF1:
—23V,
VF2:
—26V,
VA:
—15V
and
Vp:
—34V]
necessary
in
the
contro] unit.
3) Synchronizing Signal Circuit
The
power
source
synchronizing
signal
is
available
in
order
to
compose
a
basic
standard
time
in
the
clock
circuit.
It
accompanies
a
very
small
error
because
it
works
on
commercial
frequency.
.
4) ACL Circuit
A
circuit
to
generate
signals
resetting
the
LSI
to
the
initial
state when power is supplied.
5) Buzzer Circuit
The
buzzer
is
responsive
to
signals
from
the
LSI
to
emit
noticing
sounds
(key
touch
sound
and
completion
sound).
24
6) Door Switch
A
switch
to
“tell”
the
LS!
if
the
door
is
open
or
closed.
7) Relay Circuit
To
drive
the
magnetron,
grill
heating
element,
cooling
fan
motor, and light the oven lamp.
8) Indicator Circuit
Indicator
element
is
a
Fluorescent
Display.
Basically,
a
Fluorescent
Display
is
triode
having
a
cathode,
a
grid
and
an
anode.
Usually,
the
cathode
of
a
Fluorescent
Display
is
directly
heated
and
the
filament
serves
as
cathode. The Fluorescent Display 6-digits, 15-segments
=
.) i ie
R-6R50(
R-8G5O}
R-BG52{
R-6R70(
DESCRIPTION OF LSI (R-6G50/R-6G52)
LS] (IZA1538DR)
The I/O signal of the LS! (IZA153DR) is detailed in the following table.
Pin. No.
Description
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI.
Connected to GND. (OV)
Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
input signal which communicates the door open/close information to LSI.
Door closed; “H” level! signal (OV)
Door opened; "L" level signal (—5V)
Terminal not used. Connected to GND.
Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
In High operation, the signals holds “’L” level during microwave cooking and “H” level
while not cooking. In other cooking modes (MED HIGH, MED, MED LOW, LOW) the’
signal turns to “H” level and “’L”’ level in repetition according to the power level.
ON
HIGH |
|
ON ”
MED HIGH 24 sec.
Pa Ss (a eee
MED an LE
Pore |
ON a
MED Low L—2#=.{, 20s]
; 4: GND
ON
LOW 26sec.
baal OFF L
32 sec,
ee —_ _ ————e|
Oven lamp driving signal (Square waveform: 50Hz).
To turn on and off shut-off relay (RY1). |
The square waveform voltage is delivered to the RY1 driving circuit and relays (RY2,
RY3 and surge) contro! circuit.
t 20 msec.
TAR
Buring cooking

16
17
18
19
20
21
P42
P41
ae
P37
P36
P34
OUT
OUT
OUT
OUT
Key strobe signal.
otherwise.
Cooling fan motor driv
To turn on and off shut-off relay (RY4).
“H" level otherwise.
Grill heating element driving signat.
To turn on and off the gril! heater relay (RY3),
____, During
cooking
{Gril
ing signal.
4" Javel during GRILL;
“H" level
“L" level during both microwave and grill
* GRILLIKG; The cooling fan motor relay is designed to turn off 1 min. later than the
grill relay.
Terminal not used.
Surge limiting relay dri
During
oh a
ving signal.
The surge limiting relay is designed to turn on 15 msec. earlier than the cook relay (RY2).
Terminal not used.
Terminal not used.
200msec.
$$$ $a}
Signal applied to touch-key section.
A pulse signal is input to RO —R3 terminal while one of G-8 line keys on key matrix
is touched.
Key strobe signal.
Signal applied to touct
1-key section.
A pulse signal is input to RO —R3 terminal while one of G 7 line keys on key matrix
is touched.
Key strobe signal.
Signal applied to touch-key section.
A pulse signal is input to RO —R3 terminal while ane of G-6 line keys on key matrix
is touched.
26
R-6R50(W)/(B)
R-6G5O(W)/{B
R-6G52(W)/(B
R-6R7D(W)/(B)
Sane
22 P33 OUT
23 P32 OUT
24 P3i
Key strobe signal.
Signal applied to touch-key section.
A pulse signal is input to RO —R3 terminal while one of G-5 line keys on key matrix
is touched,
Signal to sound buzzer.
A : Key touch sound.
B : Completion sound.
C : When a stage finishes for Compu Cook.
0.1 sec.
Signal synchronized with commercial power source frequency.
This is the basic timing for all time processing of LSI.
Auto-clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied.
Temporarily set to “’L”’ level the moment power is supplied, at this time the LS! is reset.
Thereafter set at ee level.
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation cireult with .
respect to XOUT terminal.
Internal clock oscillation frequency. control output.
Output to control osillation input of XIN.
Terminal not used.
Power source voltage: —5V.
VC voltage of power source circuit input.
Terminal not used.
Signal coming from touch-key.
When either one of G-1 line keys on key aati is touched, a corresponding signal out of -
P33 — P36 will be input into R3.
When no key i is touched, the signal is held at ’’L” level.
27

Pin No.
35
36
37
38
39
40
Signal 1/0 Description
R2 IN Signal similar to R3.
When either one of G-2 line keys on key matrix is touched, a corresponding signa! will
be input into R2.
Signal similar to R3.
When either one of G-3 line keys on key matrix is touched, a corresponding signal will
be input into R71.
Signal similar to R3.
When either one of G-4 line keys on key matrix is touched, a corresponding signal will
be input into RO.
Anode (segment) of Fluorescent Display light-up voltage: —34V.
VP voltage of power source circuit input.
P17 Segment data signals.
The relation between signals and indicators are as follows:
Segment Signal | Segment
a tL © 1) a oc
eee eee eee eet eel el OLE UUUUUUCUC a kl hl hl hl hl hl hl hl hl hl hl Ul Cll
Ce ee
ee a Y
eee
eee
eee
ee
ewe
ne we
oe
oA
00L0U0UmUmUUUUUU™CUClU
le
kl
kl
hl
hl hl hl hl
whlch
Ul
eC
le
a a i) ©)
Ce ee ee Y
eo 6 hw ew ee kk lel le
LO A?
a |
& (50H2) | | |
—-n ee GND
a ile me —-_——— Approx.
—34V
Digit selection signal, ;
The relation between digit signal and digit are as follows:
Digit signal digit Digit signal
a A i i
[ko Oe ey
Cr SD i Oo ee er ed
Normally, one pulse is output in every & period, and input to the grid of the Fluorescent
Display. :
ma a-H
B (50H2) | | |
: week
28
R-6R50(W)/{B)
R-6R70(W)/(B)
Pin No. Signal | Description
OUT Segment data signal.
Signal similar to P17.
43 OUT Digit selection signal.
Signal similar to P16.
Segment data signal.
Signal similar to P17.
Segment data signal.
Signal similar to P17,
Digit selection signal.
Signal similar to P16.
Segment data signal,
Signal similar to P17.
Digit selection signal.
Signa! similar P16.
Segment data signal.
Signal similar to P17.
Digit selection signal.
Signa! similar P16,
Segment data signal.
Signal similar to P17.
‘Digit selection signal.
Signal similar to P16,
Segment data signal.
Signal similar to P17.
Terminal not used.

SERVICING
Precautions for Handling Electronic
Components
This untt uses PMOS LS] in the integral part of the
circuits. When handling these parts, the following
precautions should be strictly followed.
PMOS LSI] have extremely high impedance at its
input and output terminals. For this reason, it is
easily influenced by the surrounding high voltage
power source, static electricity charge in clothes,
etc,and sometimes it is not fully protected by the
built-in protection circuit.
In order to protect PMOS LSt.
1) When storing and transporting, thoroughly
wrap them in aluminum foil. .
Also wrap all PW boards containing them in
aluminium foil.
2) When soldering, ground the technician as
shown in the figure and use grounded
soldering iron and work table.
approx, 1M
Shapes of Electronic Components
wo B
ECB E .
B
EC
Transistor
Transistor
Transistor
aoei
es
a
ait
DTA143ES
OTA114YS
DT-BI43ES
Servicing of Touch Control Panel
We describe the procedures to permit servicing of
the touch contro! panel of the microwave oven and
the precautions you: must take when doing so.
To perform the servicing, power to the touch con-
trol panel is available either from the power line of - - -
the oven itself or from an external power source.
(1) Servicing the touch control panel with
power supply of the oven: .
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF
THE MICROWAVE OVEN IS STILL LIVE
DURING SERVICING PRESENT A HAZ-
ARD.
Therefore, when checking the performance of
the touch contro] panel,put the outer cabinet
on the oven to avoid touching the high voltage
transformer, or unplug the primary terminal
(connector) of the high voltage transformer to
turn it off; the end of such connector shall be
insulated with an insulating tape. After servic-
ing, be sure to replace the leads to their original
locations. se
A. On some models, the power supply cord be- -
tween the touch contral panel and the oven it-
self is so short that the two can't be separated.
an
For those models, check and repair all the
controls (sensor-related ones included) of the
touch control pane! while keeping it connected
to the oven.
B.
On
some
models,
the
power
supply
cord
be-
tween the touch control panel and the oven
proper is long enough that they may be sepa-
rated from each other. For those models,
therefore, it is possible to check and repair the
controls of the touch control panel while
keeping it apart from the oven proper;in this
Case you must short both ends of the stop
switch (on PWB) of the touch control panel
with a jumper, which brings about an opera-
tional state that is equivalent to the oven door
being closed.
As for the sensor-related controls of the touch
control panel, checking them is possible if
dummy resistor{s) with resistance equa! to that
of the controls are used.
(2) Servicing the touch control panel with
power supply from an external power |
source;
Disconnect the touch control panel completely
from the oven proper,and short both ends of
the stop switch (on PWB) of the touch control
panel,which brings about an operational state
that is equivalent to the oven door being
closed. Connect an external power source to
the power input terminal of the touch control
panel, then it is possible to check and repair the
controls of the touch control panel; it is also
possible to check the sensor-related controls
of the touch control pane! by using the dummy
resistor(s). :
4. Servicing Tools
Tools required to service the touch contro! panel
_ assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.}
2) Oscilloscope: Single beam, frequency range:
DC - 10MHz type or more ad-
vanced model.
3) Others: Hand tools
Other Precautions
1} Before turning on the power source of the
conirol unit, remove the aluminum foil applied
for preventing static electricity.
2) Connect the connector of the key unit to the
control unit being sure that the lead wires are
not twisted.
3) After aluminum foil is removed, be careful that
abnormal voltage due to static electricity etc. is
not applied to the input or output terminals.
4) Attach connectors, electrolytic capacitors, etc.
to PWB, making sure that all connections are
tight.
5) Be sure to use specified components where
high precision is required.
(RD94ZE2U)
Verse!
7. WARNING: To avoid possible exposure to microwave 4.
R-6RS0(W)/(B)
R-6R70(W)/(B}
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
There is any defective parts in the interlock,
oven door or microwave generating and trans-
energy;
A. Before operating the oven mission assembly.
1. Make sure that unlatching the door slowly is 5. There is any other visible damage to the oven.
accompanied by a click indicating actuation of C. Do not operate the oven
the monitor switch and latch switches, 1. Without the RF gasket.
2. Check visually the door seal for arcing and 2. If the door is not closed.
eamnage: CAUTION: DISCONNECT OVEN FROM POWER
B. Do not operate the oven before any of the follow- SUPPLY BEFORE REMOVING
ing conditions are repaired; ve
an OUTER CASE. DISCHARGE HIGH
1. Door does not close firmly against the front of VOITAGE CAPACITOR BEFORE
appliance.
2. There is a broken door hinge or support.
3. The door is bent or warped.
TOUCHING ANY OVEN COMPO-
NENTS OR WIRING.
(RDA1203U}
ROTTISSERIE MOTOR ASSEMBLY REMOVAL
5. Now, the rotisserie motor assembly is free.
Note: Don’t remove only the rotisserie motor from the
rotisserie motor angle because the special ad-
1. Disconnect the oven from power supply and remove
the outer case cabinet.
2. Discharge the high voltage capacitor.
= SRLene abies mein) tem ny justment is needed to install the rotisserie motor
4.
Remove
the
two
(2)
screws
holding
the
rotisserie
in
the
rotisserie
motor
angle.
motor assembly to the oven cavity.
POSITION OF THE WIRE TIES
~~ ~ s | Noise unit angle
Noise fitter unit
de
NOISE
UNIT
ANGLE
\t
Vi
on
2
HIGH
VOLTAGE
f
é
CAPACITOR eS oN High voltages capacitor
Wire harness {main} @ f
Wira tio
Wire tie
a
oe
Sao
POWER SUPFLY CORD
Wire harness
{for cord connector)
Powor supply cord
Figure C-1. For Model R-6R50 Figure C-2. For Model R-6G50,-6G52, -6R70
31

§-6R50(W}/{B)}
3-6G50(W)}/{B)
3-6G52(W)/(B)
3-6R70(W)/(B)
1ST
LATCH
SWITCH,
2ND
LATCH
SWITCH,
STOP
SWITCH
MONITOR
SWITCH
AND
HEATER
SWITCH
REMOVAL
Disconnect
the
oven
from
power
supply
and
remove
the
outer
case
cabinet.
—
2.
Discharge
the
high
voltage
capacitor.
3.
Remove
the
single
(1)
screw
hoiding
the
relay
mounting
plate
to
the
base
plate.
4,
Remove
the
two
(2)
screws
holding
the
latch
hook
to
the
oven.
5.
Open
the
door
and
pull
the
latch
hook
out
of
the
oven
flange.
(Refere to Figure C-3.)
For 1st latch switch;
1)
Disconnect
the
wire
leads
from
the
1st
latch
switch.
2)
Push
the
retaining
tab(holding
the
left
side
of
the
1st
latch
switch)
lettwards
slightly,
and
then
push
the
1st
latch
switch
downwards(to
the
ar-
row
direction),
and
remove
it
from
the
[atch
hook.
For other switches;
The
switches
can
be
removed
by
doing
proce-
dure as same as above.
CAUTION:
WHEN
REMOVING
THE
SWITCHES,
DON’T
BREAK
THE
TABS
OF
THE
LATCH HOOK,
Laich hook
Stop switch
Push backwards
2nd latch
switch
Push upwards
Pull forwards
Push backwards
Monitor switch
Tst laich
“== switch
Push leftwards
Figure C-3. Switch Removal
1ST
LATCH
SWITCH,
2ND
LATCH,
STOP
SWITCH,
HEATER
SWITCH
AND
MONITOR
SWITCH
ADJUSTMENT
om,
In
case
Ist
latch
switch,
2nd
latch,
stop
switch,
heater
switch
and
monitor
switch
do
not
operate
properly
due
to
a
mis-adjustment,
the
following
adjustment
should
be
made,
1.
Loosen
the
two
(2)
screws
holding
the
latch
hook.
2.
With
the
door
closed,
adjust
the
latch
hook
by
moving
it
back
and
forward,
or
up
and
down.,
In
and
out
play
of
the
door
allowed
by
the
latch
hook
should
be
less
than
0.5
mm,
-
The
vertical
position
of
the
latch
hook
should
be
_
placed
where
the
‘1st
latch
switch
and
2nd
latch
switch
have
activated
with
the
door
closed.
The
horizontal
position
of
the
latch
hook
should
be
placed
where
the
stop
switch,
heater
switch
and
monitor
switch
have
activated
with
the
door
closed,
3.
Secure
the
screws
with
washers
firmly.
4.
Make
sure
of
the
1st
latch
switch,
2nd
latch
switch,
.
stop
switch,
heater
switch
and
monitor
switch
op-
eration.
If
those
switches
have
not
activated
with
the
door
closed,
loose
two
(2)
screws
holding
latch
hook
and-adjust
the
latch
hook
position.
After
adjustment,
make
sure
of
the
following:
1.
The
1st
latch
switch
and
2nd
latch
switch
interrupt
the
circuit
before
the
door
open,
and
then
the
stop
switch,
heater
switch
and
monitor
switch
(COM-NO)
contacts
interrupt
the
circuit.
2.
The
monitor
switch
(COM-NC)
contacts
close
when
the
door
is
opened.
3.
Re-install
outer
case
and
check
for
microwave
leakage
around
the
door
with
an
approved
micro-
wave
survey
meter.
(Refer
to
Microwave
Measure-
ment
Procedure.)
Stop switch
Monitor
switch
tsi latch
swiich
Switch Jevar
Open lever
Open button
Figure
C-4,
Latch
Switch
Adjustments
i
si
peat.
pee,
4 i
Rs
Q
‘
R-6R50{
R-6G50|
R-6G52
R-6R70(
MICROWAVE MEASUREMENT |
After adjustment of door latch switches, monitor
switch and door are completed individually or collec-
tively, the following leakage test must be performed
with a survey instrument and it must be confirmed that
the result meets the requirements of the performance
standard for microwave oven.
REQUIREMENT
The safety switch must prevent microwave radiation
emission in excess of 5mW/cm2 at any point 5cm or
more from external surface of the oven.
PREPARATION FOR TESTING:
Before beginning the actual test for leakage, proceed
as follows;
1. Make sure that the test instrument is operating
normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the require-
ment for instrumentations as prescribed by the per-
formance standard for microwave ovens must be
used for testing.
an
Recommended instruments are:
NARDA 8100
NARDA 8200
HOLADAY HI]! 1500
SIMPSON 380M
. Place the oven tray into the oven cavity. a
. Place the load of 275 +15ml of water initially at
20 +5 °C in the center of the oven tray. The water
container should be a low form of 600 mi beaker
with inside diameter of approx. 8.5cm and made of
an electrically non-conductive material such as
glass or plastic.
The placing of this standard load in the oven is im-
portant not only to protect the oven, but also to in-
sure that any leakage is measured accurately.
. Close the door and turn the oven ON with the timer.
set for several minutes. If the water begins to boil
before the survey is completed, replace it with
275m! of the coo! water.
. Move the probe slowly (not faster that 2.5cm/sec.)}
along the gap.
. The microwave radiation emission should be meas-
ured at any point of 5cm or more from the external
surface
of
the
oven.
(RDB1103U)

;
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ROTISSERIE
MOTDA
spas?
Figure S-1. Pictorial Diagram for MQdel R-6R50
Figure §-2. Pictorial Diagram for Model R-6G50,-6G52
E
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