Merrychef eikon
®
e2s service and repair manual
48
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5 Service information
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5.3
Fault finding
Hardware control components
Operations communication:
1.
The oven has two main controlling parts, being the QTS assembly (keyboard, screen, logic) and the SRB (Smart Relay
Board to switch and monitor the required operation).
2.
The QTS is the master of the oven and instructs the SRB what to do, in turn the SRB communicates information on
the operation back to the QTS.
3.
The QTS and SRB have their own Personality Module (PM) fitted with the respective software to be able to
communicate and work with each other.
4.
The power provision to the QTS and the communication between QTS and SRB is enabled via ONE cable with RJ45
connectors fitted.
Start-up sequence
With the oven switch in the OFF position and the mains power ON, the QTS & SRB boards boot up. Boot up information will
be displayed on the screen, which will then go blank awaiting a switch on. When the oven switch is turned ON the splash
screen briefly displays oven information, if required tap the screen (“tap to hold”) to keep the data visible. After completing a
successful logic test, the safety relays are energised and the cabinet cooling fan, convection fan and stirrer(s) are activated.
The oven then preheats or displays a preheat temperature choice. Once preheated the oven displays the main menu if in "Full
service mode" or a recipe selection if in "Quick service mode".
Shutting down sequence
When the oven switch is turned OFF the screen displays ‘Shutting down’ and the microwave and heater safety relays de-
energise. The cooling fan and convection fan operate until the cabinet temperature has been sufficiently reduced to a cavity
temperature of 50°C (122°F). The QTS & SRB boards remain active whilst a mains power supply is present.
Exchanging data via USB interface
Loading menus/firmware from a USB memory stick and downloading the menu/recipe counters/error log to a USB memory
stick is covered in sections 4.4 & 4.5 within this service & repair manual.
8.
Select the heater, it increases to a maximum cavity temperature of 250
o
C and then
continually cycles, maintaining this temperature. Selecting the heater again will turn it off.
The convection fan automatically runs at 50% by default (the fan speed can be manually
altered up to 100%).
Check the cavity temperatures and heater element current draw are correct. The displayed
current should be between 9A and 10A @230V but is dependent on the mains supply
voltage. The current draw will start to reduce between 225
o
C & 250
o
C. Both displayed
temperatures (thermocouple reading & calculated cavity temperature) should be similar.
9.
Further diagnostic information can be found below the oven picture;
Safety circuit condition, i.e “Overheat Stat: Closed”
Voltage selection relay condition, e.g. 230 V
QTS board temperature
SRB board temperature
Mains supply voltage and frequency (as read on the SRB)
and scrolling current language selection, time & date and KCCM if installed (
KCCM
= KitchenConnect offline /
KCCM
= KitchenConnect online)
