HOBART CHINA SERVICE MANUAL EFFICIENT – RELIABLE – INNOVATIVE SERVICE MANUAL AMX/AM900 SERIES Starting from Serial No 210910000 This document is produced for internal use only. The detailed settings and servicing must be carried out by service technicians qualified by HOBART. Reproduction of this document is prohibited without the written permission of HOBART. Version 1.0 0911 .
AMX/AM900 SERVICE MANUAL As continued product improvement is a policy of HOBART, specifications are subject to change without notice. 2 / AMX/AM900 .
CONTENT 1. STANDARD MODELS – OVERVIEW ........................................................................................................................ 4 2. MACHINE DIMENSIONS ........................................................................................................................................ 5 3. INSTALLATION ....................................................................................................................................................... 6 3.
AMX/AM900 SERVICE MANUAL 1. STANDARD MODELS – OVERVIEW NO.
2. MACHINE DIMENSIONS .
AMX/AM900 SERVICE MANUAL 3. INSTALLATION 3.1 ELECTRICAL CONNECTION The machines will be supplied as standard with cable 6 (or 4) mm2 (cable length approx. 2 m from cable gland). A fused disconnects or circuit breaker with electrical leaking protector (not supplied) must be installed in the electrical line supplying the dishwasher and should meet the requirements of your local electrical code. According to EN 60 335 the appliance must be connected to an equipotential conductor.
4. SMARTRONIC CONTROLS 4.1 AM900 SERIES 1 Machine ON / OFF Pushing this button switches the machine on. By pushing and holding (3 seconds) this button, the self cleaning cycle starts. At the end of the cycle, the machine switches off automatically. After switch off, the machine is not voltage free! Furthermore the button illuminates to indicate the mode of the machine: GREEN (flashing) = Machine is filling and heating. Wash cycle is running.
AMX/AM900 SERVICE MANUAL 4.2 AMX SERIES 1 Machine ON/OFF DRAIN Pushing this button switches the dishwasher on. By pushing and holding (3s) this button, the drain and self cleaning cycle starts. Once the drain cycle has completed the machine switches off automatically.
5. FIRST RUN / CUSTOMER MENU Initial fill of the rinse booster On delivery, the switching function S28 (first booster filling) is set to "0". There is no menu "boF". As the booster is controlled by a pressure transmitter, no initial fill must be carried out. Therefore the booster heating is not locked. Requirement: Machine "OF" and hood open If the hood will be closed or if no button is pressed within 10 seconds, the display switches off automatically and the new settings will be saved.
AMX/AM900 SERVICE MANUAL 6. HYDRAULIC SCHEMATICS 6.1 LEGEND OF COMPONENTS B1 TEMPERATURE SENSOR BOOSTER B2 TEMPERATURE SENSOR TANK B3 PRESSURE TRANSMITTER BOOSTER B4 PRESSURE TRANSMITTER TANK E1 BOOSTER HEATING E2 TANK HEATING M1 WASH PUMP M2 RINSE PRESSURE PUMP M3 RINSE AID DISPENSER M4 DETERGENT DISPENSER M5 DRAIN PUMP S1 REED‐SWITCH – HOOD S2 AIRGAP IMPELLER 1) S3 SALT DEFICIENCY SWITCH 2) S4 REED‐SWITCH – STRAINER Y1 SOLENOID VALVE – FILL Y3.1 VALVE RESIN A 2) Y3.
6.2 AM900 带升温箱 WITH BOOSTER S1 2 S2 4 5 Y1 1 M4 B4 S4 1E2 B3 M3 M1 B1 3 1E1 (2E1) 排水 DRAIN M2 BOOSTER DRAIN WITHOUT BOOSTER 不带升温箱 S1 4 5 1 M4 B4 1E2 S4 M1 M3 B1 M2 排水 DRAIN .
AMX/AM900 SERVICE MANUAL 6.3 AMX WITH SOFTENER 带软水器 S1 2 S2 4 5 Y1 1 M4 B4 1E2 S4 B3 Y4.2 M3 6 M1 7B 7A 3 B1 S3 1E1 (2E1) M2 Y3.2 M5 Y4.1 排水 DRAIN Y3.1 升温箱排水 BOOSTER DRAIN WITHOUT SOFTENER 不带软水器 S1 2 S2 4 5 Y1 1 M4 B4 1E2 S4 B3 M3 M1 B1 1E1 (2E1) 3 M2 M5 DRAIN 排水 12 / AMX/AM900 BOOSTER DRAIN 升温箱排水 .
WITHOUT SOFTENER 不带软水器、不带升温箱 WITHOUT BOOSTER S1 4 5 1 M4 B4 1E2 S4 M1 M3 B1 M2 M5 排水 DRAIN .
AMX/AM900 SERVICE MANUAL 7. FILLING 7.1 AIRGAP The reed‐switch S2 on the small PCB 775540‐1 is actuated by the impeller magnet. The impeller monitors the incoming water flow by counting impulses and then relaying that information back to the main PCB. The count rate is 200 impulses per liter. 1. Water consumption counter [C77] + [C78] (counted liters are added to basic value "0"). 2.
7.2 PRESSURE TRANSMITTER B3 / B4 Via air traps (booster / wash tank) compressed air will be directed via clear hoses to the pressure transmitter booster (B3) and wash tank (B4). The transmitter changes the upcoming pressure into DC voltage which will be processed by the control as water level message. If there is no fault, the voltage value can be displayed: – via the service menu F03 fill level booster / F04 fill level wash tank or – set switching function [S56] to "1" (menu U02).
AMX/AM900 SERVICE MANUAL 7.3 DOSING EQUIPMENT 7.3.1 DETERGENT / RINSE AID DISPENSER Dispensers AMX/ AM900 Detergent (775556‐12): delivery rate 3.0 l/hr Rinse aid (775556‐11): delivery rate 0.4 l/hr hose inside: 775608‐2 hose inside: 775608‐1 Pre‐adjusted values All models: "8" = 8.0 s ≈ 2.40 g/l (possible range 0‐50 s ≈ 0‐15.4 g/l) Detergent CH1 Rinse aid CH2 AMX/AM900： "7.0" = 7.0 s ≈ 0.31 g/l (possible range 0‐50 s ≈ 0‐2.2 g/l) AUP: "2.5" = 2.5 s ≈ 0.33 g/l (possible range 0‐50 s ≈ 0‐6.
7.3.2 ADJUSTMENT OF CHEMICALS DEFICIENCY SENSORS POTENTIOMETER: Graduations: 1 to 9 Sensitivity: 1 (non‐sensitive chemical sensing / sensitive failure indication 9 (sensitive chemical sensing / non‐sensitive failure indication) Basic setting: 3 Detergent Rinse aid Due to the physical properties of rinse aid (e.g. wetting), even smallest rinse aid quantities inside the hose will be detected by the deficiency sensor. If the sensor is adjusted too sensitively, maybe deficiency will not be released.
AMX/AM900 SERVICE MANUAL 7.4 SOFTENER 7.4.1 GENERAL Before first run, the softener has to be filled with 2 kg of regeneration salt and potable water. Switching function: [S05] = "1" (standard setting for machine programs with softener) Salt capacity: max. 2 kg (coarse grained, max.10 mm – no tablets) Salt consumption: approx. 40 g / regeneration Softener setting: see next page Parameters: [C84] number of salt fillings (see also page 33) [C85] number of wash cycles with deficiency of salt NOTE: 1.
7.4.2 SOFTENER CHECK PROCEDURE Check: Parameter [C84] = number of salt fillings. Parameter [C85] = number of wash cycles with deficiency of salt (illuminated salt indicator). What you need to verify the softener function: 1. Test kit to measure the water hardness (part number 607236). Pay attention to expiry‐date. 2. A conductivity‐meter (possibly pH indicator strips 609927). How respectively where to measure? Use clean tea‐cup or beaker for sampling water. 1.
AMX/AM900 SERVICE MANUAL 7.4.3 SOFTENER TEST PROGRAM REQUIREMENT: Machine has to be switched "OFF" and the hood must be open. – Push and hold program and service button (dryer button) together. U01 appears in the rinse temperature display. – Select softener test program U03 by pushing the stop button. – To enter U03 push the ON/OFF button. The ON/OFF button illuminates GREEN while the test program is running. Once the test sequence has completed, the ON/OFF button will switch off. 20 / AMX/AM900 .
7.5 BOOSTER / TANK / TEMPERATURE PROBES BOOSTER Booster heating: 12.6/6.3/0 kW Total volume: 10.3 liter Useable volume: 5.2 liter Water consumption / rinse cycle: 2.
AMX/AM900 SERVICE MANUAL 8. WASHING 8.1 WASH PUMP AND STRAINER SYSTEM The pump unit includes motor with flange, mechanical shaft seal, impeller and capacitor. A non return flap (called Flipper) allows the draining of the circulation system (AMX only). The Flipper prevents soil, collected in the pump sump, from reentering the circulating system. 8.1.1 FUNCTION (AMX only) During wash cycle, the wash liquid is distributed to the upper and lower wash arm.
8.1.2 TECHNICAL DATA WASH PUMPS – CONNECTED LOAD Voltage / Frequency / Part no. Phases Current Capacitor Power Impeller AMX / AM900 02‐883617‐1 220‐240V / 50Hz / 1P 3.2A 16μF 0.73kW 104mm AMX / AM900 02‐883617‐2 220‐240V / 60Hz / 1P 3.4A 16μF 0.73kW 94mm WASH PUMPS – SERVICE KITS 883617‐10 AMX / AMXT 883617‐20 The Service Kits include: 50Hz 60Hz 1. O‐ring 2. Impeller 3. Mechanical shaft seal 8.2 RINSE PUMP Part number Voltage Frequency Current Power Capacitor .
AMX/AM900 SERVICE MANUAL 9. HOOD – DETAILS MAINTENANCE Check plastic bearings for sufficient lubrication. Hood lift handle Support Adjustment of tension springs Example: AMX Distance "A" from lower edge of bent to upper edge of channel: approx. 12 cm – insulated hood approx. 18.5 cm – non‐insulated hood Insufficient spring force: The hood keeps not safe in "stand‐by" position or closes. Too much spring force: The hood does not keep tightly closed during wash cycle.
10. HEAT RECOVERY GENERAL With activation of the fill valve (booster refill), the control 897545‐1 will be actuated by an impulse and starts the drain pump (partial tank draining, approx. 2.5 l) simultaneous to filling. The output clock signal is adjustable via basic data. The fresh water enters via the airgap the outer coaxial pipe of the heat exchanger and will be heated up by tank water, flowing in the inner coaxial pipe (counter‐flow principle).
AMX/AM900 SERVICE MANUAL 11. ELECTRONIC CONTROL 11.1 KEY COMBINATIONS 11.1.1 BASIC OPERATION / CUSTOMER SETTINGS X = button to be pushed BASIC OPERATION STOP PROGR.
11.1.2 SERVICE MENU Requirements: Machine OFF and Hood open. Push Stop, Program and Service button to enter the Service Menu. DISPLAY: CLOSE HOOD (door switch test S1) UPPER S01 LOWER ‐‐0 (ON/OFF button illuminates) S02 ‐‐1 S02 ‐‐0 no signal / ‐ ‐ 1 signal from S2 ‐‐0 Select appropriate Input or Output by pushing the Program button. Inputs test: X13.3 Impeller switch Push ON/OFF to activate additionally fill valve Y1. X13.
AMX/AM900 SERVICE MANUAL 11.1.3 PROGRAMMING / MODIFICATION OF BASIC DATA / SOFTENER TEST Requirement: machine "OFF" and hood open. – Push Program and Service button together. Software release will be displayed short‐time. – Push Stop button to select the menu item. U01 = Machine type selection U02 = Basic data sheet U03 = Softener test program – The selected function will be confirmed with the ON/OFF button and indicated by the illuminated ON/OFF button.
11.2 PRINTED CIRCUIT BOARDS 11.2.1 MAIN BOARD LED 1 hood switch: LED 2 impeller switch: LED 3 processor function: ON = hood closed unsteady = water flow (pulses) flashing = voltage on, processor running permanent = voltage on, processor not running Note: The control works with or without plugged E‐EPROM 897547‐010. TO INSTALL A NEW SOFTWARE RELEASE: 1. Disconnect control fuse F1. 2. Plug in the new E‐EPROM and reconnect F1.
AMX/AM900 SERVICE MANUAL 11.2.2 EXTENSION BOARD A3 NOTE: The additional board (897546‐1) is only built in at machines with softener. This PCB has three potential‐free contacts.
11.3 COUNTER FUNCTIONS Request for hygiene program [C71] – down‐counter The number of wash cycles will be subtracted from the preset value ([S19] "on"). When "0" is reached, start of hygiene program is requested. After hygiene cleaning is completed, this counter will be reset to basic value. Number of hygiene cycles [C72] – up‐counter / basic value "0" The number of completed hygiene cycles is counted. Reset only possible via basic data. Note: Control, how often the program has been started.
AMX/AM900 SERVICE MANUAL 12. FAULTS 12.1 UNCRITICAL FAULTS Fill, wash and drain program can be started. During the fill program, uncritical faults are only indicated by the indicator lights and error codes (none green/red flashing ON/OFF button). INDICATOR Rinse Wash The ON/OFF button is flashing GREEN/RED alternately. Lamp FAULT Drain fault AL PROGRAM Level switch value [F11] still exceeded at the end of the drain cycle. F11 To reset, repeat drain program until value is below [F11].
12.2 CRITICAL FAULTS Only the drain program can be started. Fill program and all wash programs are locked. INDICATOR Rinse F01 Wash ‐‐1 ‐‐2 The ON/OFF button illuminates RED. lamp FAULT Temperature probe BOOSTER B1 PROGRAM. Booster heating RL10 will be switched off immediately. Fill and wash programs are locked, drain program can be started. Possible cause Remedy 1. ‐ ‐ 1 = short circuit (temperature probe or wires 1. Check wires, replace temperature probe. to probe). 2. ‐ ‐ 2 = open circuit. 2.
AMX/AM900 SERVICE MANUAL INDICATOR Rinse Wash The ON/OFF button illuminates RED. Lamp FAULT FILL 1 FIL PROGRAM The fill valve Y1 (RL7) is triggered and the impeller switch S2 does not count (no impulses on X14.3). Reset via input pulses on X14.3 or machine "OF". Possible cause with incoming water Remedy 1. Bad contacts at impeller switch plug (airgap) or 1. Check contacts, solder plug (airgap) if necessary. PCB. 2. Check PCB and lock in place. 2. Impeller switch PCB not correctly locked. 3.
NOTES .
AMX/AM900 SERVICE MANUAL R&D, Hobart China 36 / AMX/AM900 .
