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

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

425F 450F

G12

FAN LIGHT

9