Sharp R-1612 User manual

R-1610
R-1611
R-1612
Intheinterestofuser-safetytheovenshouldberestoredtoitsoriginal
condition and only parts identical to those specified should be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens con-
tain circuitry capable of producing very high voltage and
current. Contact with the following parts may result in a
severe, possibly fatal, electrical shock. (High Voltage Capaci-
tor, High Voltage Power Transformer, Magnetron, High Volt-
age Rectifier Assembly, High Voltage Harness etc..)
TABLE OF CONTENTS Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY...................INSIDE FRONT COVER
BEFORE SERVICING ......................................................................................................INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL................................................................................................................1
MICROWAVE MEASUREMENT PROCEDURE ...................................................................................................2
FOREWORD AND WARNING...............................................................................................................................3
PRODUCT SPECIFICATIONS ..............................................................................................................................4
GENERAL INFORMATION...................................................................................................................................4
OPERATION..........................................................................................................................................................6
TROUBLESHOOTING GUIDE ..............................................................................................................................8
TEST PROCEDURE ..............................................................................................................................................9
TOUCH CONTROL PANEL ASSEMBLY ............................................................................................................11
CONPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................14
PICTORIAL DIAGRAM ........................................................................................................................................16
POWER UNIT CIRCUIT ......................................................................................................................................17
LSI UNIT CIRCUIT...............................................................................................................................................18
INDICATOR CIRCUIT..........................................................................................................................................19
PARTS LIST ........................................................................................................................................................20
PACKING AND ACCESSORIES .........................................................................................................................25
S5911R1610X//
R-1610
R-1611
R-1612
MODELS
SUPPLEMENTAL SERVICE MANUAL
SHARP CORPORATION This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
This is a supplemental Service Manual for Models R-1610, R-1611 and R-1612. These models are quite similar to
base model R-1600,R-1601 and R-1602. Use this supplemental manual together with the Base Models Service
Manual (Reference No. is S4910R1160X//) for complete operation, service information, etc..
OVERTHE RANGE
MICROWAVE OVEN
SENSOR DEFROST TURNTABLE COOK
OFF
HELP
12345
67890
Rice Poultry
Popcorn
Fish/
seafood
Ground
meat
Lunch on
the Run One Dish
Dinners
Breakfast
Bar
Compu
Defrost Beverage
Center
Super
Defrost
Fresh
vegetables
Turntable
On/Off
Kitchen Timer
Clock Stop Clear START Touch On
Memory
Cook Power Level Minute Plus
Work
Light Night
Light Fan
Hi/Lo Auto
Fan
Frozen
entrees

Frozen
snacks

Frozen
vegetables
Custom 
Help
Baked
potato
Sensor
reheat
Se nso r Coo kin g
More from your Microwave

R-1610
R-1611
R-1612
PRECAUTIONSTO BE OBSERVED BEFORE AND
DURING SERVICINGTO AVOID POSSIBLE
EXPOSURETO EXCESSIVE MICROWAVE
ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3)
seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and
latches, (5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave
generation and transmission systems shall be repaired, replaced, or adjusted by procedures described
in this manual before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS
CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's
Center for Devices and Radiological Health immediately.
ServicepersonnelshouldinformSHARPELECTRONICSCORPORATIONofanycertifiedunitfound
with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit
until the oven has been brought into compliance.

1
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WARNINGTO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of pro-
ducing very high voltage and current, contact with
following parts
may result in a severe, possibly
fatal, electrical shock.
(Example)
HighVoltageCapacitor,HighVoltagePowerTrans-
former,Magnetron,HighVoltageRectifierAssem-
bly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Before Servicing
1. Disconnect the power supply cord , and then
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
The high-voltage capacitor remains charged about 60
secondsaftertheovenhasbeenswitchedoff.Waitfor60
secondsandthenshort-circuittheconnectionofthehigh-
voltagecapacitor (thatis theconnecting leadof thehigh-
voltage rectifier) against the chassis with the use of an
insulated screwdriver.
Whenever troubleshooting is performed the power supply
mustbedisconnected.Itmayin,somecases,benecessary
to connect the power supply after the outer case has been
removed, in this event,
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. Disconnect the leads to the primary of the power
transformer.
5. Ensure that these leads remain isolated from other
components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed,
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. Reconnect the leads to the primary of the power
transformer.
5. Reinstall the outer case (cabinet).
6. Reconnectthe power supply cord after the outercase is
installed.
7. Run the oven and check all functions.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstall the outer case (cabinet).
3. Reconnectthe power supply cord after the outercase is
installed.
4. Run the oven and check all functions.
Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup
of cold water on the oven turntable, close the door and set
the power to HIGH and set the microwave timer for two (2)
minutes. When the two minutes has elapsed (timer at zero)
carefully check that the water is now hot. If the water
remainscoldcarryoutBefore Servicingprocedureandre-
examine the connections to the component being tested.
When all service work is completed and the oven is fully
assembled,themicrowavepoweroutputshouldbechecked
and microwave leakage test should be carried out.
Don't Touch !
Danger High Voltage

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MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
shouldnotexceed1mW/cm2atanypoint5cmormorefromtheexternalsurfaceoftheoven,measuredpriortoacquisition
bya purchaser,andthereafter (throughthe usefullifeof theoven), 5mW/cm2atanypoint 5cmor morefromthe external
surface of the oven.
2) Safety interlock switches Primary interlock relay and door sensing switch shall prevent microwave radiation emission in
excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission
in excess of 5 mW/cm2at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Surveyinstruments that comply withthe requirement for instrumentation as prescribed bythe performance standard for
microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive material such as glass or plastic.
Theplacing of this standardload in the oven is important notonly to protect theoven, but also to insure that anyleakage
is measured accurately.
4) Set the cooking control on Full Power Cooking Mode
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasptheprobeofthesurveyinstrumentandholditperpendiculartothegapbetweenthedoorandthebodyoftheoven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Checkforleakageatthedoorscreen,sheetmetalseamsandotheraccessiblepositionswherethecontinuityofthemetal
has been breached (eg., around the switches, indicator, and vents).
Whiletestingforleakagearoundthedoorpullthedoorawayfromthefrontoftheovenasfarasispermittedbytheclosed
latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.

3
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SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
SERVICE MANUAL
OVER THE RANGE MICROWAVE OVEN
R-1610/ R-1611/1612
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information
for the SHARP OVER THE RANGE MICROWAVE OVEN, R-1610/ R-1611/ R1612.
The models R-1610, R-1611 and R-1612 are quite similar to base models R-1600, R-1601 and R-1602 (Reference No. is
S3910R1600X//).
It is recommended that service personnel carefully study the entire text of this manual and base model service manual so
that they will be qualified to render satisfactory customer service.
Check the interlock switches and the door seal carefully. Special attention should be given to avoid electrical shock and
microwave radiation hazard.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained service personnel.
DANGER
Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing.
Service personnel - Do not contact the following parts while the appliance is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage
Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
All the parts marked “*” on parts list are used at voltages more than 250V.
Removal of the outer wrap gives access to voltage above 250V.
Allthepartsmarked“∆”onpartslistmaycauseunduemicrowaveexposure,bythemselves,orwhentheyaredamaged,
loosened or removed.

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ITEM DESCRIPTION
Power Requirements 120 Volts / 14 Amperes
60 Hertz
Single phase, 3 wire grounded
Power Output 1000 watts (IEC-705 TEST PROCEDURE)
Operating frequency of 2450MHz
Case Dimensions Width 29-15/16"
Height 16-3/8"
Depth 15- 1/16" (Not including the door handle)
Cooking Cavity Dimensions Width 21"
Height 8-7/8"
1.6 Cubic Feet Depth 14-7/16"
Hood lamp 2 bulbs, 20W x 2, Incandescent light bulbs
Hood fan Approx. 300 C.F.M.
Control Complement Touch Control System
Clock ( 1:00 - 12:59 )
Timer (0 - 99 min. 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
P-HI..................................................Full power throughout the cooking time
P-90 .................................................................... approx. 90% of Full Power
P-80 .................................................................... approx. 80% of Full Power
P-70 .................................................................... approx. 70% of Full Power
P-60 .................................................................... approx. 60% of Full Power
P-50 .................................................................... approx. 50% of Full Power
P-40 .................................................................... approx. 40% of Full Power
P-30 .................................................................... approx. 30% of Full Power
P-20 .................................................................... approx. 20% of Full Power
P-10 .................................................................... approx. 10% of Full Power
P-0 .................................................... No power throughout the cooking time
Sensor Cooking pads, Breakfast Bar pad, Lunch on the Run pad
One Dish Dinners pad, Super Defrost pad, Compu Defrost pad
Beverage Center pad, Number selection pads, Turntable On / Off pad
Memory Cook pad, Power Level pad, Minute Plus pad
Kitchen Timer / Clock pad, Stop / Clear pad, Start / Touch On pad
Work Light pad, Night Light pad, Fan Hi / Lo pad, Auto Fan pad
Oven Cavity Light 20W x 1 Incandescent light bulb
Safety Standard UL Listed FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
Weight Approx. 56 lbs.
PRODUCT SPECIFICATION

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GENERAL INFORMATION
GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed
and grounded in accordance with the National Electrical Code and local codes and ordinances.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the
electric current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.
Electrical Requirements
The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE
GROUNDING PIN FROM THE PLUG.
Thepowersupplycordandplugmustbeconnectedtoaseparate120VoltAC,60Hz,15Amp.ormorededicatedline,using
a grounded receptacle. The receptacle should be located inside the cabinet directly above the Microwave Oven/Hood
system mounting location.
3-Pronged Plug
Grounded
Receptacle Box
Grounding Pin
3-Pronged Receptacle
CONTROL PANEL
SENSOR DEFROST TURNTABLE COOK OFF
HELP
12345
67890
Rice Poultry
Popcorn
Fish/
seafood
Ground
meat
Lunch on
the Run One Dish Dinners
Breakfast
Bar Compu
Defrost Beverage Center
Super
Defrost
Fresh
vegetables
Turntable
On/Off
Kitchen Timer
Clock Stop Clear START Touch On
Memory
Cook Power Level Minute Plus
Work
Light Night Light Fan Hi/Lo Auto Fan
Frozen
entrees

Frozen
snacks

Frozen
vegetables
Custom 
Help
Baked
potatoes
Sensor
reheat
Sensor Cooking
More from your Microwave

6
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R-1612
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
SENSOR COOKING CONDITION
UsingtheSensorCookingfunction,thefoodsarecookedor
defrosted without figuring time, power level or quantity.
When the oven senses enough steam from the food, it
relaystheinformationtoitsmicroprocessorwhichwillcalcu-
latethe remainingcooking time andpower levelneeded for
best results.
When the food is cooked, water vapor is developed. The
sensor “senses” the vapor and its resistance increases
gradually. When the resistance reaches the value set ac-
cording to the menu, supplementary cooking is started.
Thetimeofsupplementarycookingisdeterminedbyexperi-
ment with each food category and inputted into the LSI.
An example of how sensor works (Baked potato):
1. Potatoes at room temperature. Vapor is emitted very
slowly.
MICROWAVE
2. Heatpotatoes. Moistureand humidity isemitted rapidly.
You can smell the aroma as it cooks.
3. Sensor detects moisture and humidity and calculates
cooking time and variable power.
Cooking Sequence.
1. Touch one of the Sensor Cooking pads. And then touch
START/TOUCH ON pad.
NOTE: TheovenshouldnotbeoperatedonSensorCooking
immediately after plugging in the unit. Wait two
minutes before cooking on Sensor Cooking.
2. Thecoilofshut-offrelays(RY1andRY3)areenergized,
theovenlamp,turntablemotorandcoolingfanmotorare
turned on, but the power transformer is not turned on.
3. Afterabout32seconds,thecookrelay(RY2)isenergized.
The power transformer is turned on, microwave energy
is produced and first stage is started.
The 32 seconds is the cooling time required to remove
any vapor from the oven cavity and sensor.
NOTE: Duringthisfirststage,donotopenthedoorortouch
STOP/CLEAR pad.
4. When the sensor detects the vapor emitted from the
food,thedisplayswitchesover totheremainingcooking
time and the timer counts down to zero.
At this time, the door may be opened to stir food, turn it
or season, etc.
5. Whenthe timer reaches zero, anaudible signal sounds.
The shut-off relay and cook relay are de-energized and
the power transformer, oven lamp, etc. are turned off.
6. OpeningthedoorortouchingtheSTOP/CLEARpad,the
timeofday willreappearonthe displayandtheoven will
revert to an OFF condition.
MICROWAVE
AH SENSOR

7
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SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL "HIGH"
4. "START" PAD TOUCHED
Figure O-2. Oven Schematic-Cooking Condition
Figure O-1. Oven Schematic-Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
CAVITY 
THERMAL CUT-OUT MAGNETRON  TEMPERATURE FUSE
FUSE 
20A
TURNTABLE MOTOR FAN MOTOR
STIRRER MOTOR
MAGNETRON
OVEN LAMP
MONITOR SWITCH
BLKWHT
AH SENSOR
POWER
TRANSFORMER
HIGH VOLTAGE
CAPACITOR
0.94µF
HIGH VOLTAGE
RECTIFIER
COM. N.O.
COM.
CONTROL UNIT
GND
GRN
HOOD
MOTOR
B7
B5
B3
B1
A1 A3 B9 A7 A5 N.O.
F1
F2
F3
E1
E2
DOOR
SENSING
SWITCH
SECONDARY
INTERLOCK
SWITCH
120 V AC.
60 Hz
HOOD
LAMP
HL HL
RY3 RY1 RY2
PRIMARY INTERLOCK  RELAY
SSR
FM
STM
OL
TTM
HOOD FAN
THERMAL
CUT OUT
HOOD
CAPACITOR
RY4
RY5
N.C.
Low
High
MAGNETRON 
TEMPERATURE FUSE
FUSE 
20A
TURNTABLE MOTOR FAN MOTOR
STIRRER MOTOR
MAGNETRON
OVEN LAMP
MONITOR SWITCH
BLKWHT
AH SENSOR
POWER
TRANSFORMER
HIGH VOLTAGE
CAPACITOR
0.94µF
HIGH VOLTAGE
RECTIFIER
COM. N.O.
COM.
CONTROL UNIT
GND
GRN
HOOD
MOTOR
B7
B5
B3
B1
A1 A3 B9 A7 A5 N.O.
F1
F2
F3
E1
E2
DOOR
SENSING
SWITCH
SECONDARY
INTERLOCK
SWITCH
120 V AC.
60 Hz
HOOD
LAMP
HL HL
RY3 RY1 RY2
PRIMARY INTERLOCK  RELAY
FM
STM
OL
TTM
HOOD FAN
THERMAL
CUT OUT
HOOD
CAPACITOR
RY4
RY5
N.C.
CAVITY 
THERMAL CUT-OUT
SSR
Low
High

8
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TROUBLESHOOTING GUIDE
Nevertouch anypart inthe circuitwithyour handor anuninsulated toolwhile thepowersupply isconnected.
Whentroubleshootingthemicrowave oven,itishelpfulto followtheSequenceofOperation inperformingthechecks. Many
ofthepossible causesoftroublewillrequirethataspecifictestbeperformed.Thesetestsaregivenaprocedureletterwhich
will be found in the "Test Procedure "section.
IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, relay (RY1)
primary interlock relay (RY2), door sensing switch and secondary interlock switch before replacing the
monitor fuse. If monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA016/
KiT as an assembly.
IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases,
be necessary to connect the power supply cord after the outer case has been removed, in this event,
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. Disconnect the leads to the primary of the power transformer.
5. Ensurethattheleads remainisolatedfromothercomponents andovenchassisbyusing insulationtape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed
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. Reconnect the leads to the primary of the power transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
LQCK
CONTROL UNIT AH SENSOR SHORTED OR OPENED WIRING
The oven stops and "ERROR" is displayed or does not end during Sensor Cooking
condition. (Oven does not shut off after a cup of water is boiling by Sensor Cooking.)
Oven stops at 32 seconds after starting.
TEST PROCEDURE
PROBLEM
CONDITION
SENSOR
COOKING
CONDITION
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
NOTE: For additional troubleshooting procedures, please refer back to the R-1600/1601/1602 base model Service
Manual.

9
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TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
M KEY UNIT TEST
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. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable
ismakinggoodcontact,verifythatthedoorsensingswitch(stopswitch)operatesproperly;thatisthe
contacts are closed when the door is closed and open when the door is open. If the door sensing
switch (stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control
unitand make sure the doorsensing switch is closed (eitherclose thedoor or shortthe doorsensing
switch connecter). Use the Key unit matrix indicated on the control panel schematic and place a
jumperwire betweenthepins thatcorrespond totheSTOP/CLEAR padmaking momentarycontact.
If the control unit responds by clearing with a beep the key unit is faulty and must be replaced. If the
control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond,
the above method may be used (after clearing the control unit) to determine if the control unit or key
pad is at fault.
5. Reconnect all leads removed
from components during testing.
6. Re-install the outer case
(cabinet).
7. Reconnectthepowersupplycord
after the outer case is installed.
8. Run the oven and check all
functions.
QAH SENSOR TEST
Checking the initial sensor cooking condition
WARNING : The oven should be fully assembled before following procedure.
(1)The oven should be plugged in at least two minutes before sensor cooking.
(2)Room temperature should not exceed 95˚F (35˚C).
(3)The unit should not be installed in any area where heat and steam are generated. The unit should
not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION
INSTRUCTIONS” of the operation manual.
(4)Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To
permit adequate ventilation, be sure to install so as not to block these vents. There should be some
space for air circulation.
(5)Besuretheexteriorofthecookingcontainerandtheinterioroftheovenaredry.Wipeoffanymoisture
with a dry cloth or paper towel.
(6)The Sensor works with food at normal storage temperature. For example, chicken pieces would be
at refrigerator temperature and canned soup at room temperature.
(7)Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The
sensor will detect the vapour given of by the spray and turn off before food is properly cooked.
(8)If the sensor has not detected the vapour of the food, ERROR will appear and the oven will shut off.
Water load cooking test
WARNING : The oven should be fully assembled before following procedure.
Make sure the oven has been plugged in at least two minutes before checking sensor cook operation.
The cabinet should be installed and screws tightened.
(1)Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
(2)Place the container on the center of tray in the oven cavity.
(3)Close the door.
(4)Touch Sensor reheat pad once and touch the Start pad, Now, the oven is in the sensor cooking
condition and “SENSOR REHEAT” and "COOK" will appear in the display.
(5)The oven will operate for the first 16 seconds, without generating microwave energy.
G 8
5
04 93 82 71 6
G 7
Compu
Defrost Night Light
Stop
Clear
Memory
Cook
One Dish
Dinners Lunch on the Run
Work
Light Power Level
Minute
Plus
Popcorn
Fan
Hi / Lo
Turntable
On / Off
Frozen
snacks Frozen entrees Beverage center
Auto
Fan
Ground
meat
Rice
Fish/
seafood
Fresh
vegetables Sensor reheat
Frozen
vegetables Baked potatoes
Poultry
Custom
Help
Breakfast
Bar Super Defrost
G 6 G 5 G 4 G 3 G 2 G 1
G14 G13 G12 G11 G10 G 9
Kitchen
Timer

Clock
START
Touch On


10
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TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of
sensor cooking.
(6)Afterapproximately32seconds,microwaveenergyisproduced,andthedisplayshouldstarttocount
down the remaining cooking time and oven should turn off after water is boiling (bubbling).
If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below.
TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT
To determine if the sensor is defective, the simplest method is to replace it with a new replacement
sensor.
(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 AH sensor.
(5)Install the new AH sensor.
(6)Reconnect all leads removed from components during replacing.
(7)Re-install the outer case (cabinet).
(8)Reconnect the power supply cord after the outer case is installed.
(9)Reconnect the oven to the power supply cord and check the sensor cook operation proceed as
follows:
9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
9-2. Place the container on the center of tray in the oven cavity.
9-3. Close the door.
9-4. Touch Sensor reheat pad once and touch the Start pad.
9-5. The control panel is in automatic Sensor operation.
9-6. The display will start to count down the remaining cooking time, and the oven will turn off
automatically after the water is boiling (bubbling).
If new sensor dose not operate properly, the problem is with the control unit, and refer to explanation
below.
CHECKING CONTROL UNIT
(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)Disconnect the sensor connector that is mounted to control panel.
(5)Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
(6)Disconnect the leads to the primary of the power transformer.
(7)Ensurethattheseleadsremainisolatedfromothercomponentsandovenchassisbyusinginsulation
tape.
(8)After that procedure, re-connect the supply.
(9)Check the sensor cook operation proceed as follows:
9-1. Touch Sensor reheat pad once and touch the Start pad.
9-2. The control panel is in the sensor cooking operation.
9-3. After approximately 32 seconds, push plunger of select switch for more than 3 seconds. This
condition is same as judgement by AH sensor.
9-4. After approximately 3 seconds, the display shows “ X X . X X “ which is the remaining cooking
time, and the display count down.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
(10) Disconnect the power supply cord, and then remove outer case.
(11) Open the door and block it open.
(12) Discharge high voltage capacitor.
(13) Disconnect the dummy resistor circuit from the sensor connector of control panel.
(14) Carry out necessary repair.
(15) Reconnect all leads removed from components during testing and repairing.
(16) Re-install the outer case (cabinet).
(17) Reconnectthepowersupplycordaftertheoutercaseinstalled.Runtheovenandcheckallfunction.

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Plunger
NC
NO
COM
COM NO
NC
R3 R4
R1
R2
1
2
3
F-1
F-2
F-3
To connector (F)
on Control Unit.
CONNECTOR
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
Sensor Dummy Resistor Circuit
(18) Carry out “Water load cooking test” again and ensure that the oven works properly.
R1, R2 : 22Ω±1% 1/2W
R3 : 4.3kΩ±5% 1/4W
R4 : 1MΩ±5% 1/4W
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit.Itincorporatesaverysmallerrorbecauseitworks
on commercial frequency.
4) ACL Circuit
A circuit to generate a signals which resetting the LSI to
the initial state when power is applied.
5) Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
audiblesounds(keytouchsoundandcompletionsound).
6) Door Sensing Switch
A switch to inform the LSI if the door is open or closed.
7) Relay Circuit
To drive the magnetron, fan motor, stirrer motor, turnta-
blemotor, hoodmotor, and lightthe ovenlamp andhood
lamp.
8) Indicator Circuit
This circuit consists of 40 segments and 16 common
electrodes using a Light Crystal Display.
The Light Crystal Display (LCD) is drived by LCD driver
IC3.
9) Back Light Circuit
Acircuittodrivethebacklight(LightemittingdiodesLD1-
LD10).
10) Absolute Humidity Sensor Circuit
This circuit detects moisture of the cooking food to allow
its automatic cooking.
The touch control section consists of the following units
as shown in the touch control panel circuit.
(1) Key Unit
(2) Control Unit (The Control unit consists of LSI Unit and
Power U nit)
The principal functions of these units and the signals com-
municated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P10-P17.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P41, P42,
AN8,AN9,AN10andAN11toperformthefunctionthatwas
requested.
Control Unit
Control unit consists of LSI, power source circuit, synchroniz-
ing signal circuit, ACL circuit, buzzer circuit, relay circuit,
absolutehumiditysensor,indicatorcircuitandbacklightcircuit.
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 necessary for the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
Symbol Voltage Application
VC -5.1V LSI(IC1)

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DESCRIPTION OF LSI
LSI(IZA958DR)
The I/O signal of the LSI(IZA958DR) is detailed in the following table.
Pin No. Signal I/O Description
NOTE: For additional informations of LSI, please refer back to the R-1600/1601/
1602 base model Service Manual.
1 AN10 IN Signal coming from touch key.
When either G10 line on key matrix is touched, a corresponding signal out of P10-P17 will
be input into AN10. When no key is touched, the signal is held at "H" level.
9 P15 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and
P42 terminal while one of G3 line keys on key matrix is touched.
10 P16 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN8, AN9, AN10, AN11, P41
and P42 terminal while one of G2 line keys on key matrix is touched.
11 P17 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to AN9, AN10, AN11, P41 and
P42 terminal while one of G1 line keys on key matrix is touched.
29 P32 OUT Terminal not used.
30-34 P33-P37 OUT Used for initial balancing of the bridge circuit (absokute humidity sensor).
91 AN0 IN Used for initial balancing of the bridge circuit (absokute humidity sensor). This input is an
analog input terminal from the AH sensor circuit, and connected to the A/D converter built
into the LSI.
92 AN1 IN AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the A/
D converter built into the LSI.
99 AN8 IN Input terminal to judge the model.
ThesignaloutofP16willbe inputintoAN8 throughG2lineonkeymatrix.TheLSIwilljudge
the model by this signal.

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(3)DetectorCircuitofAbsoluteHumiditySensorCircuit
Thisdetectorcircuitisusedtodetecttheoutputvoltageof
the absolute humidity circuit to allow the LSI to control
sensor cooking of the unit. When the unit is set in the
sensor cooking mode, 16 seconds clearing cycle occurs
than the detector circuit starts to function and the LSI
observes the initial voltage available at its AN1 terminal.
With this voltage given, the switches SW1 to SW5 in the
LSI are turned on in such a way as to change the
resistance values in parallel with R98 ~ R102 of IC2.
Changingtheresistancevaluesresultsinthatthereisthe
samepotentialatbothF-3terminaloftheabsolutehumidity
sensor and AN0 terminal of the LSI. The voltage of AN1
terminalwill indicate about-2.5V. This initial balancingis
setupabout 16secondsafter theunitis putinthe Sensor
Cookingmode. Asthesensorcookingproceeds,thefood
is heated to generate moisture by which the resistance
ABSOLUTE HUMIDITY SENSOR CIRCUIT
C
S
R3
R1
R2
+
Operational
amplifier Output
voltage
S : Thermistor
open vessel
C : Thermistor
closed vessel
2
Absolute humidity (g/m )
Output voltage
Absolute humidity vs,
output voltage characteristic


SW1
SW2
SW3
SW4
SW5
P33
P34
P35
P36
P37
LSI
(IC1)
AN0
AN1
620k
300k
150k
75k
37.4k
30
33
34
91
92
32
31
47k
47k
IC2 10k
0.01uF
0.015uF
0.01uF
+
VA : -15V VA : -15V
R90
C90
C91
C93
C92
S
F-2 1.8k
F-1
F-3C3.57k
3.32k
VC : -5V
0.1
uF
C. Thermistor in 
closed vessel
S. Thermistor in
open vessel
R98

R99
R96
R91
360k
R93
R92
R94 R95
D90
R100
R101
R102
R97
(1)Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors
as shown in the illustration. One thermistor is housed in
the closed vessel filled with dry air while another in the
openvessel.Eachsensorisprovidedwiththeprotective
cover made of metal mesh to be protected from the
external airflow.
(2)Operational Principle of Absolute Humidity Sensor
Thefigurebelowshowsthebasicstructureofanabsolute
humidity sensor. A bridge circuit is formed by two
thermistors and two resistors (R1 and R2).
The output of the bridge circuit is to be amplified by the
operational amplifier.
Each thermistor is supplied with a current to keep it
heated at about 150˚C (302˚F), the resultant heat is
dissipatedintheairandifthetwothermistorsareplaced
in different humidity conditions they show different
degrees of heat conductivity leading to a potential
differencebetweenthemcausinganoutputvoltagefrom
the bridge circuit, the intensity of which is increased as
the absolute humidity of the air increases. Since the
output is very minute, it is amplified by the operational
amplifier.
balance the bridge circuit is deviated to increase the
voltage available at AN1 terminal of the LSI.
Then the LSI observes that voltage at AN1 terminal and
comparesitwithitsinitialvalue,andwhenthecomparison
ratereaches thepreset value (fixedfor eachmenu tobe
cooked),theLSI causestheunitto stopsensorcooking;
thereafter, the unit goes in the next operation
automatically.
When the LSI starts to detect the initial voltage at AN1
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance, of
the bridge circuit due to disconnection of the absolute
humidity sensor, ERROR will appear on the display and
the cooking is stopped.
1) Absolute humidity sensor circuit
ventilation opening for sensing Sensing part
(Open vessel) Sensing part
(Closed vessel)
Thermistors

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To prevent an electric shock, take the following pre-
cautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door block it open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. Don’t let the wire leads touch to the followiong parts;
1) High voltage parts:
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer
and Oven cavity.
WARNING FOR WIRING
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Switch lever, Open
button.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked
andmakesurethatthewireleadsdonot comeoffeven
if the wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANAL PARTS, DOOR PARTS’, when carrying out any of
the following removal procedures:
HOOD FAN MOTOR, HOOD DUCT, OVEN LAMP SOCKET AND AH. SENSOR REMOVAL
1. Disconnectthe power supplycord and remove the oven
fromwalland removeoutercase. (Refertoprocedure of
"RemovalofOvenfromWall"and"OutercaseRemoval"
of the base model Service Manual)
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the 6-pin connector of the hood fan motor
fromthemainwireharnesslocatedattherightedgeofthe
hoodductandreleasethesnapbandfromthehoodduct.
5. Removethehoodfanmotor fromthehoodductbylifting
it up.
6. Now, the hood fan motor is free.
7. Disconnect the connector CN-F from the control unit.
8. Remove one(1)screwholdingthehoodducttotheoven
cavity front plate.
9. Release the 6-pin connector and the 3-pin connector of
the main harness A from the hood duct.
10.Disconnectthewireleadsfromthefanmotorandchassis
support, and release the wire leads from holes of the
hood duct.
11.Remove the two (2) unit mounting screws from the
chassissupport(rightside)andthehoodduct(leftside).
12.Remove the one (1) screw holding the chassis support.
13.Remove the chassis support.
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may
result in severe, possibly fatal, electric shock.
(Example)
HighVoltage Capacitor, Power Transformer, Magnetron, High VoltageRectifier Assembly, High VoltageHarness etc..
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
WARNING AGAINST HIGHVOLTAGE:
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
1. Disconnect the power supply cord.
2. Visuallycheckthedoorandcavityfaceplatefordamage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. Thereare defective partsinthe microwavegenerating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.

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14.Removethehoodductfromtheovencavitybyliftingitup.
15.Screw the oven lamp off from the lamp socket.
16.Remove the lamp socket from the lamp angle.
17.Pullthewireleadsfromtheovenlampsocketbypushing
theterminalholeoftheovenlampsocketwithasmallflat
type screw driver.
18.Now, the oven lamp socket is free.
19.Release the harness of the AH sensor assembly from
three (3) wire holders of the hood duct.
20.Removetwo(2)screwsholdingtheAHsensorassembly
to the hood duct.
21.Now, the AH sensor assembly is free.

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6
45
123
6
45
123
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-1. Pictorial Diagram
HIGH VOLTAGE RECTIFIER
HIGH VOLTAGE CAPACITOR
HIGH VOLTAGE WIRE A
HIGH VOLTAGE COMPONENTS
CONTROL UNIT
POWER  TRANSFORMER
Power Supply cord 120V 60Hz
1 2 3
WHT
GRN
BLK
WHT
GRN
BLK
CAVITY THERMAL CUT-OUT
MAGNETRON TEMPERATURE  FUSE
WHT
RED
BLK
RED
BLK
FAN MOTOR
TURNTABLE MOTOR
GRY
ORG
WHT
ORG
ORG RED
WHT
ORG
BLK
WHT
HOOD LAMPS & SOCKETS
Blue  Marking
Blue Marking
OVEN LAMP & SOCKET
to Chassis Support
CN-E
GRY
WHT
WHT
WHT
BLU
WHT
WHT WHT
BLK
SECONDARY INTERLOCK SWITCH
N.O.
N.C.
COM.
COM.
MONITOR SWITCH
FUSE & HOLDER
N.O.
N.O.
GRN
RED
N.O.
COM.
DOOR SENSING SWITCH
CN-B
CN-E
CN-FCN-C
CN-G
CN-C
CN-A
1
9 1
1
1
14
13
2
7
PRIMARY INTERLOCK RELAY
RY1 RY3
RY2
RY4
RY1 N.O. RY1 COM. RY2 N.O. RY2 COM.
GRY
C100
T1
HOOD FAN MOTOR
STIRRER MOTOR
1
2
3 4 5 6
WHT
RED
YLW
BLU
BLK
WHT
RED
YLW
BLU
BLK
1
2
RED
GRN
1
2
3 4 5 6 7
YLW
WHT
BLK
RED
CN-A
W
H
T
G
R
Y
HOOD FAN THERMAL CUT-OUT
RED
WHT
RED
REDRED
ORG
RED
ORG
GRN
to Right Base Plate
GRN
1
2
3 4 5 6 7
BLK
RED
ORG
WHT
8 9ORG
CN-B
IC1 IC3
COM.
COM.
RY2:
RY5
RED
BLK
RED
ORG ORG
BLK RED
WHT WHT
RED
MAGNETRON
W
H
T
R
E
D
WHT
BLK AH SENSOR RED
WHT
1 2 3
CN-F

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6
45
123
6
45
123
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-2. Power Unit Circuit
+
–
+
–
+
–
A 7
C10
C 2
C 3
C 1
C 9
C 4
C11
C 5
C12
C13
C 6
C 8
C 7
C14
C15
A 3
A 5
B 9
NO
COM
B 1
B 3
B 5
B 7
NO
COM
E 2 E 1
A 1
Q2
2SB1238
Q1
2SB1238
ZD1 HZ16-1
Q3
KRC243M
DOOR SENSING
SWITCH
R4 27
C1 0.1µ/50v
(J1)
D23D21
R110 47 1/2w
D25D24D22
C3 0.1µ/50v C4 10µ/35v
C2 1000µ/35v
R5 4.7k
R1 2.4k
C100
7µ/230v
AC
MOTOR RUN
CAPACITOR
TURNTABLE
MOTOR TURNTABLE
MOTOR
LED
GND
VC
VA
VR
INT
BUZZER
HOOD LAMP
HOOD MOTOR
HIGH / LOW
HOOD MOTOR
COM
MICRO
DOOR
SENSING
SWITCH
N.C.
OVEN LAMP
FAN MOTOR
TURNTABLE
MOTOR
HOOD LAMP
OVEN LAMP
FAN MOTOR
COM
COM
COM
NOTE : IF NOT SPECIFIED 1SS270A
: IF NOT SPECIFIED 1/4W ±5%
MICRO
LOW
HOOD MOTOR
HOOD
THEMO
HIGH
C110
0.033µ/250v
C5
10µ/35v
R6 3.3k
R3
510 1/2w
R2 680 1/2w
SP1
PKM22EPT
D5
T1
83
15
D4
D3 D2
D1
D1-4
11ES1
ab
d
RY3
SSR1
A
A
RY1
R20 1k 1/2w
RY5
RY4
RY2
c
VRS1 10G471K
D6

18
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6
45
123
6
45
123
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-3. LSI Unit Circuit
C-4 C-2
INT GND VC LED VR
TURNTABLE MOTOR OVEN LAMP FAN MOTOR HOOD LAMP HOOD MOTOR H / L HOOD MOTOR COM
NOTE
: IF NOT SPECIFIED, 1/10W ±5%
BUZZER MICRO DOOR
AH SENSOR
NC
VA
C-3
C-10
C-9
C-11 C-12
C-1
C-13
C-5 C-6
C-15
C-8
C-14
G 8
5 04
93
82
71
6
G 7
Compu Defrost Night
Light
Stop
Clear
Memory
Cook
One Dish
Dinners Lunch on
the Run
KEY UNIT
Work
Light Power
Level
Frozen snacks Frozen
entrees Beverage
center
Auto
Fan
Ground
meat
Sensor
reheat Baked
potatoes
Fish/
seafood
Fresh
vegetables
Frozen
vegetables
Poultry Rice Minute
Plus
Popcorn
Fan
Hi / Lo
Turntable
On / Off
Custom
Help
Breakfast
Bar Super
Defrost
G 6 G 5 G 4 G 3 G 2 G 1
G14 G13 G12 G11 G10 G 9
Kitchen
Timer
Clock
START
Touch On

+
–

C-7
F-1
C10 47µ/16v
C90
0.1µ/50v
C17 0.1µ/50v
C91
0.015µ/25v
C20 0.1µ/50v
C12
0.1µ
/50v
R12
15k
R96 3.57kDR91 3.32kD
R10
1k
R40 4.7k
R102 37.5kF
R101 75kF
R100 150kF
R99 300kF
R98 620kF
R79 270k
R78 270k
R77 270k
R76 270k
R75 270k
R74 270k
R80
1M
C110
4.7k
ZD10
UDZ4.3B
R11
15k
(J10)
(J11) 4.7K
(J13) 4.7K
(J15) 4.7K
(J17) 4.7K
(J12)
(J14)
(J16)
R66
15k
R65
15k
R64
15k
R63
15k
R62
15k
R61 
15k
R60
15k
R67
15k
C13
0.01µ
/25v
C14
0.01µ
/25v
C40
0.01µ/25v
C93
0.01µ/25v
C92
0.01µ/25v
C64 330p/50v
C65 330p/50v
C63 330p/50v
C62 330p/50v
C61 330p/50v
C60 330p/50v
Q11 DTA143EKA
D90 MA152WA
Q25 DTA143EKA Q24 DTA143EKA
Q23 DTA143EKA
CF1 CST4.00MGW
Q30  DTA143EKA
Q20  DTA143EKA
Q22 DTA143EKA
Q21 DTA123JKA
I H
EDCBA
GND
Q10 2SA1037AK
IC2 BA4558
IC1 IZA958DR
See Figure S-4. 
R41 15k
R90 330 1w
R95 47k
R97 47k
R94 10k
R93 360kF
R92 1.8kF
SEG36 SEG5
SEG35
AN10
AN11
AVSS
P10
P11
P12
P13
P14
P15
P16
P17
X 1
X 2
VSS
OSC2
OSC1
TEST
RES
P20
P21
P22
P23
P24
P25
P26
P27
P30
P31
P32
P33
P91
P90
P87
P86
P85
P84
P83
P82
P81
P80
P77
P76
P75
P74
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG4 SEG3 SEG2 SEG1
COM1 COM2 COM3 COM4
VCC
V 0 V 1 V 2 V 3
VSS
CVCC
P37 P36 P35 P34
SEG37 SEG38 SEG39 SEG40
P40 P41 P42
IRQ0
AVCC
AN0 AN1 AN2 AN3 AN4 AN5 AN6 AN7 AN8 AN9
R68 15k R69 15k R70 15k R71 15k R72 15k R73 15k
D20 1SS355 D41 1SS355
LD1
LD8
LD9LD10
LD2 LD3
LD4LD5LD6LD7
G
F
100 81
80 51
50 31
E D C B A
301
GHI
F
CPU UNIT
F-2 F-3
+
5 64
87
IC2