PROCEDURE
CLEAR
TOUCH ON
POWER
LEVEL
KEEP
WARM
TURNTABLE
ON / OFF
STOP
START
375 F
350 F
400 F
CLOCK
KITCHEN
TIMER
6
7
8

R - 1 8 7 0

R - 1 8 7 1

PROCEDURE

LETTER

COMPONENT TEST

 

 

Note: When defective components, the Control Unit or Key Unit are replaced, the defective part or parts

 

must be properly packed for return in the shipping carton, with its cushion material, in which the

 

new replacement part was shipped to you.

RKEY UNIT TEST

If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is making good contact, verify that the door sensing switch (stop switch) operates properly; that is the contacts are closed when the door is closed and open when the door is open. If the door sensing (stop switch) is good, disconnect the flat ribbon that connects the key unit to the control unit and make sure the door sensing switch is closed (either close the door or short the stop switch connecter). Use the key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to

the STOP/CLEAR pad making momentary contact. 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

 

 

 

 

G 1

 

 

G 2

 

 

G 3

 

 

G 4

 

 

G 5

 

 

G 6

 

 

G 7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

faulty and must be replaced. If a specific

 

 

 

CUSTOM

SENSOR

MINUTE

 

 

 

COMPU

SENSOR

COMPU

pad does not respond, the above method

G

8

 

 

HELP

REHEAT

 

PLUS

POPCORN

DEFROST

 

COOK

 

BROIL

may be used ( after clearing the control unit)

 

 

 

 

 

 

 

 

 

LOW MIX

HIGH MIX

 

 

 

COMPU

COMPU

G 9

 

CONVEC

PREHEAT

 

 

 

to determine if the control unit or key pad is

 

 

BAKE

 

ROAST

 

 

 

 

ROAST

 

BAKE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

at fault.

 

 

 

 

 

 

 

SLOW

1

 

2

 

3

 

4

 

5

 

 

G10

 

 

BROIL

 

 

 

 

 

 

 

 

 

 

 

COOK

 

100 F

 

150 F

 

275 F

 

300 F

 

325 F

 

 

 

 

 

 

 

 

 

 

 

 

 

G11

90

425LETTERF 450COMPONENT TESTF

G12

FAN LIGHT

9

Page 11
Image 11
Sharp R-1870 service manual Procedure, Letter, Component Test, R Key Unit Test

R-1870 specifications

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