Kuppersbusch EMWK 870.1 User manual

GB
Microwave
EMWK 870.1

Service Manual: H4-70-02-02
Responsible: D. Rutz KÜPPERSBUSCH HAUSGERÄTE AG
Email: [e-mail]
Tel.: [phone] Kundendienst
Fax: [phone] Postfach 100 132
Date: 17.09.2001 45801 Gelsenkirchen

Service Manual EMWK 870.1 3
For internal use only
Table of Contents
1. Safety Information .......................................................................................................... 4
2. Control............................................................................................................................. 5
2.1 Control Panel Fascia ............................................................................................. 5
2.2 Set Time ................................................................................................................ 5
2.3 Microwave-Only Mode........................................................................................... 6
2.4 Convection-Only Mode.......................................................................................... 6
2.5 Minute Minder........................................................................................................ 6
2.6 Baking with microwave.......................................................................................... 7
2.7 Memory ................................................................................................................. 7
3. Test Procedures ............................................................................................................. 8
3.1 Function Test......................................................................................................... 8
3.2 Test Procedure Indication Test ............................................................................. 8
3.3 Terminate Test Procedure..................................................................................... 9
3.4 Fault Indications .................................................................................................... 9
4. Trouble Shooting Procedure ....................................................................................... 10
5. Specifications ............................................................................................................... 11
6. Wiring diagrams and legend ....................................................................................... 12

4 Service Manual EMWK 870.1
For internal use only
1. Safety Information
The purpose of this Service Manual is to supply service technicians who already possess the required
technical knowledge for the repair of microwave equipment-specific information on the manner of
functioning of the EMWK 870.0.
This manual covers all equipment-specifications relevant for this type.
Descriptions and manners of functioning of the components already known are therefore disregarded in
this issue.
Warning!
Improper repairs can cause danger and damage for the user!
To avoid electric shock be sure to heed the following safety information:
♦In case of malfunction, cabinet and frame could be live!
♦Do not touch any components in the microwave, also modules can carry mains voltage!
♦Always disconnect the microwave from power before starting with the repair!
♦Always use a fault current breaker when ’live’ testing with components under a high potential!
♦The ground-lead connection must not exceed the standardized values! It is of decisive importance
for the safety of persons and the function of the equipment!
♦On completion of the repair work, carry out a test according to VDE 0701 or equivalent country-
specific regulation!
♦On completion of the repair work, carry out a function test!
♦On completion of the repair work, carry out a RF-leakage check!
To avoid damage to the microwave or the components, be sure to heed the following warnings:
♦Heed EGB instructions!
♦Never attempt repair by indiscriminate exchange of components!
♦Always proceed sytematically and follow the troubleshooting instructions!
♦Do not make any measurements in the high voltage circuit with the microwave oven in operation.
Danger to life!

Service Manual EMWK 870.1 5
For internal use only
2. Control
2.1 Control Panel Fascia
2.2 Set Time
1. Press CLOCK key.
2. Set the desired time via knob.
Display
h = hours
min. = minutes
sec. = seconds
Keys for
cooking power
Clock key
Timer key
Convection key
for setting convection time
Stop key
for cancelling wrong entries
Combi key
for setting combi cooking
Memo key
Start key
Knob
Function selector
! oven light
$ top/bottom heat
* flush-mounted grill
# hot air
0 circulating air
Temperature selector
with display lamp 50 - 250 °C
Grilling stages
* low
** medium
*** high

6 Service Manual EMWK 870.1
For internal use only
2.3 Microwave-Only Mode
1. Select desired cooking power output.
2. Set desired time via knob.
3. Press START.
2.4 Convection-Only Mode
1. Select desired cooking programme.
2. Set temperature.
2.5 Minute Minder
1. Press TIMER key.
2. Set desired time via knob.
3. Press TIMER again.

Service Manual EMWK 870.1 7
For internal use only
2.6 Baking with microwave
1. Press TIMER key.
2. Set desired time via knob.
3. Press COMBI key.
4. Select cooking programme.
5. Set temperature.
6. Press start.
2.7 Memory
Warning!
Stored info lost after power failure!
1. Press MEMO key.
2. Press Start.

8 Service Manual EMWK 870.1
For internal use only
3. Test Procedures
3.1 Function Test
Warning!
Access only possible after short switch-off of mains voltage! Access within the next
2 minutes. Oven door may be open or closed!
1. Start key press once.
2. Stop key press twice.
3. Timer key press three times.
4. All segments of the display light up, buzzer sounds.
5. Door open or closed will start the testing procedure.
When pressing the keys described, the consumers are driven for the duration of 20 seconds.
3.2 Test Procedure Indication Test
Warning!
Access only possible after short switch-off of mains voltage! Access within the next
2 minutes. Oven door may be open or closed!
1. Stop key press once.
2. Start key press twice.
3. Memo key press three times.
4. All segments of the display light up.
5. Any key will start the testing programme.
Key Depressed Symbol
Indication Indication Function (consumer) Relay
Start 800 A6. A7 MW - 800W K6 /K7 /K2
MW- Start
Timer Timer A4 Convection K4
Clock Clock A2 Oven Light
Blower K2

Service Manual EMWK 870.1 9
For internal use only
1 Display .30 can be changed by turning time knob.
3.3 Terminate Test Procedure
•After 40 sec. without pressing a key, the test procedure is exited!
•By interruption of mains voltage.
3.4 Fault Indications
Key Depressed Symbol Indication Indication
90 W 90 11.11
180 W 180 22.22
360 W 360 33.33
600 W 600 44.44
800 W 800 55.55
Timer Timer 66.66
Clock All Symbols 77.77
Combi Combi Mode Symbol 88.30 1
Convection Time Convection Time
Memo M1, M2
Stop Buzzer
Start No Symbols Software Version
microwave module
Error Indication Faults Response of Microwave in case of Fault
Er3 Electronics overheated
(pcb temperature >85 °C)
Convection does not heat up, blower
running. After cooling-off, the fault is
cancelled and microwave reheats.
Er9 Fault during ROM-check in
microwave module
After a Reset (e.g. power failure) there is a
ROM-Check. The fault is only indicated in
the module in which the fault actually
occurs.

Service Manual EMWK 870.1 10
4. Trouble Shooting Procedure
Check fuse F8 (10A)
No power
Will now start Check
Oven light illuminated Measure T1 prim: 1 Ω sec1: 0.1 Ω sec2: 44 Ω
Check relay K7
Exchange control electronics
Exchange T1 Exchange F8
Exchange C1
Check F3 Check fuse F9 (1,24A)
Check V1 and V2 Exchange V1 and V2
Carry out function test
Carry out leakage measurement and
Check door safety circuit (F4, F5, F6), set if required
Exchange F9
Check C1 for circuit to earth or
no
yes
no
yes
defect
defect
defect
defect
ok
defect
ok
defect
continuously
short-circuit
VDE0701
(top right)
N7; F4; F5; F6

Service Manual EMWK 870.1 11
For internal use only
5. Specifications
Connected load 3600 W / 16A
Microwave power levels 90 / 180 / 360 / 600 / 800 W
Top / Bottom heat 1700 W
Variogrill 2000 W
Convection 1700 W
Convection + Grill-System 2000 W
Cabinet dimensions H/B/T 458/595/505 mm
Building-in dimensions H/B/T 450/562/550 mm
Weight 43 kg
Power Consumption
Combi mode with Grill 3500 W 16 A
Combi mode with Convection 3400 W 15 A
Fast Heat-up 2500 W 11 A
Convection-only mode 1700 W 7 A
Microwave-only mode 1600 W 7 A
Consumer
Grill E16 27 Ohm
Bottom heat E12 110 Ohm
Bottom heat E13 16 Ohm
Cooling blower M1 107 Ohm
Recirculating motor M3 86 Ohm
HF transformer T1
primary 1 Ohm
secondary 1 0.1 Ohm
secondary 2 44 Ohm
Mains transformer T5
primary 300 Ohm
secondary 1.1 Ohm
Temp. sensor B1 at 20°C 540 Ohm
Safety cut-out
20°C - 120°C 24 h
121°C - 200°C 6 h
201°C - 250°C 3 h
251°C - 300°C & Grill 2 h

12 Service Manual EMWK 870.1
For internal use only
6. Wiring diagrams and legend
Path of the current
A4 = Relay board 6-27
A86 = Control and input unit 7-28
C1 = High voltage capacitor 28
E12 = Lower heating element 467W / 230V 7
E13 = Lower heating element 471W/ 87V 8
E16 = Grill heating element 2000W / 230V 8
E24 = Oven lamp 40W 13
F3 = Safety switch 4
F4 = Safety switch 25
F5 = Safety switch 25
F6 = Safety switch 26
F8 = Fuse 10A 24
F9 = Fuse 1.25 A 24
H9 = Oven temperature control lamp 6
K2 = Output relay 17
K4 = Output relay 8
K6 = Current limiting relay 25
K7 = Timing pulse relay 25
M1 = Cooling fan motor 15
M3 = Convection motor 10
N7 = Temperature limiter 24
N8 = Oven regulator 8
N13 = Cooling fan regulator 15
N15 = Temperature limiter 8
R21 = Resistance 30 ohms 24
S12 = Selection switch 6/8-10/13/14
T1 = High voltage transformer 26/27
T5 = Mains transformer 22
V1 = Magnetron 30
V2 = Protective diode 29
V4 = High voltage diode 28
Z6 = Supressor for mw 30
Z10 = Noise filter 1-4
Ansicht von hinten = Rear view
rechte Seitenansicht = Side view from the right
Stützpunkt = Support point
Trennwand = Partition wall
Schalterfront aufgeklappt - Ansicht von vorne = Switch panel unfolded - front view
Sicherheitsschalter bei geschlossener Tür = Safety switch with door closed