Foster 2998100 User manual

SERVICE'MANUAL'–'Coffee'Machine'mod.'2998100'-'2998600'
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SERVICE'MANUAL'–'Coffee'Machine'mod.'2998100'-'2998600'
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INDEX&
1) SAFETY'
2) SCOPE'OF'THIS'MANUAL'
3) DIMENSIONS'
4) HYDRAULIC'SCHEME'
5) ELECTRICAL'SCHEME'
6) STRUCTURE'
1) General'access'
2) Access'to'complete'coffee'unit'
7) FAST-ON'CONNECTIONS'
8) STEAM'ADJUSTMENT'
9) FUSE'REPLACEMENT'
10) SAFETY'THERMOSTATS'RESET'
11) KEYBOARD'REPLACEMENT'
12) POD-DRAWER'REMOVAL'
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A. SAFETY&
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Prior' to' accessing' to' internal' components' and' in' general' prior' to' intervening' on' the' appliance' at' all,'
make' sure' that' the' power' cord' has' been' disconnected' from' the' mains' and' that' the' hot' parts' have'
cooled'down.''
When'necessary,'and'anyway'when'possible,'it'is'advisable'to'make'resistance'measurements;'avoid&as&
much&as&possible&tension&or&current&measurements&on&the&appliance,&because&they&could&damage&the&
electronic&chips&of&the&appliance.&&
WARNING:' the' appliance' has' metal' parts.' It' is' therefore' advisable' to' use' much' care' in' moving' the'
appliance'and'in'working'on'it,'so'as'to'avoid'scratches,'abrasions'or'cuts.''
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B. SCOPE&OF&THIS&MANUAL&
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This'manual'is'meant'for'technicians'who'already'master'the'necessary'knowledge'to'repair'coffee'
machines'for'domestic'use.''
The'intent'of'this'manual'is'to'give'them'a'general'information'on'the'appliance,'so'as'to'facilitate'its'
repair'and'maintenance.''
More'detailed'information'on'specific'issues,'can'be'obtained'my'perusing'the'specific'technical'
documents'about'the'appliance:''
- List'of'spare'parts'
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C. DIMENSIONS&
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SERVICE'MANUAL'–'Coffee'Machine'mod.'2998100'-'2998600'
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HYDRAULIC&SCHEME&
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The'circuits'for'hot'water,'steam'and'coffee'are'fed'by'the'same'vibration'pump;'therefore,'their'supply'
happens'separately.''
Hereafter'is'a'short'description'of'the'operating'sequences'concerning'the'four'main'functions:''
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Coffee&supply:&
By' pushing' the' coffee' button,' the' cycle' of' supply' is' initiated' with' the' start' of' the' pump' P1' and' two'
electro-valves' EV2' –' EV4.' The' electro-valve' EV2' is' connected' to' the' hydraulic' piston' which' reaches'
operating'pressure'by'closing'the'infusion'chamber'on'the'drawer'filter.'At'the'same'time,'the'electro-
valve' EV4' is' opened' and' allows' passage' of' pressured' water' through' the' non-return' valve' VR1,' set' to'
open' at' the' optimal' supply' pressure.' Water' passes' through' the' coffee' exchanger' and' flows' in' the'
infusion'chamber'at'the'operating'temperature'only'if'the'mechanical'sensor'of'pod'presence'is'open,'
that'is'if'the'pod'is'present'on'the'filter.'To'stop'the'supply,'press'the'coffee'button'again.'The'pump'P1'
is'stopped'at'the'same'time'as'the'electro-valve'EV2,'while'the'electro-valve'EV4'enables'the'drainage'
of'water'in'the'drop-receptacle'basin'through'the'silicone'pipe.''
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Hot&water&supply'
When' pressing' the' hot' water' button,' the' pump' P1' and' the' electro-valves' EV1' and' EV4' are' activated.'
Water'flows'through'the'two'electro-valves'and'is'heated'by'the'coffee'exchanger,'then'flows'through'
the' moveable' supply' pipe.' When' the' required' quantity' is' reached,' to' stop' the' supply' press' the' hot'
water' button' again.' The' pump' and' the' two' electro-valves' are' stopped' and' the' water' in' excess' still'
present'in'the'coffee'exchanger'flows'back'through'EV4'and'back'in'the'drop-receptacle'basin'through'
the'silicone'pipe.'

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Steam&supply:&
When' pressing' the' steam' button,' the' steam' exchanger' is' activated.' During' the' heating' process,'
indicated' by' the' blinking' LED,' no' supply' is' possible.' When' the' work' temperature' is' reached,' the' LED'
light'becomes'fix.'To'supply'steam,'press'the'steam'button'again:'the'pump'P1'and'electro-valves'EV4'
and'EV3'are'activated.'Water'flows'through'the'pressure'regulator'RP1,'which'is'set'for'the'proper'work'
pressure,'and'heated'by'the'steam'unit,'and'exits'through'the'moveable'supply'pipe.'To'stop'the'supply,'
press'the'steam'button'again.'The'pump'and'the'two'electro-valves'are'stopped'and'the'excess'water'
within' the' steam' exchanger' flows' back' through' EV3' which' enables' the' drainage' back' in' the' drop-
receptacle'basin'through'the'silicone'pipe.'
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De-calcification&cycle&
This' programme' operates' the' pump' to' circulate' the' de-calcification' solution' without' heating' the'
heating-elements' in' both' the' coffee' and' steam' units.' By' pushing' for' 10' seconds' the' button' which'
signals'the'empty'tank,'the'coffee'and'hot'water'buttons'will'start'to'blink.'The'solution'is'to'be'mixed'
in' the' water' tank' prior' to' initiating' the' supply' of' the' de-calcification' solution' (using' the' fake' pod'
supplied'with'the'appliance)'through'the'coffee'unit'or'steam'unit.'The'activation'sequence'of'the'pump'
and'the'electro-valves'is'the'same'described'above.''
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D. ELECTRICAL&SCHEME&
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E. STRUCTURE&
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1. GENERAL&ACCESS&
BEFORE&DOING&ANYTHING,&DISCONNECT&THE&APPLIANCE&FROM&THE&ELECTRICAL&MAINS&
Prior'to'accessing'the'internal'components'and'anyway'prior'to'any'action'on'the'appliance,'
make'sure'that'the'power'cord'has'been'disconnected'from'the'electrical'mains'and'that'the'
hot'parts'have'cooled'down.'Then'proceed'as'follows:'
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Disconnect''the'power'cord.''
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Unscrew' the' 8' screws' (Allen'
screws' 2,5' mm)' that' keep' the'
side'panel'in'place.'
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Unscrew' the' 2' screws' of' the'
command' panel' (Allen' screws'
2,5'mm).''
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Lift' and' remove' the' panel' by'
pulling'upward.'''
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Once'the'panel'has'been'removed,'it'is'possible'to'gain'access'to'the'following'components:'
A. Feed'pipes'and'pump'drain.'
B. Connectors'for'LED'connections.'
C. Power'electronic'chip'and'keyboard.'
D. Coffee'hydraulic'unit'pipes.'
E. EMI'RF'grid'filter'+'main'switch.'
F. Steam'joint.'
G. Complete'coffee'unit.'
H. Mechanical'catch'screw'of'pod'drawer.'
I. Empty'water'tank'micro'switch.'
L. Pod'drawer'micro'switch.'
M. Steam'exchanger'safety'thermostats.'
N. Steam'pressure'regulator.'
O. Pod'drawer'catch'screw.'

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2. ACCESS&TO&COMPLETE&COFFEE&UNIT&
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To' be' able' to' reach' the' majority' of' the' appliance' components,' it' is' necessary' to' disassemble' the'
frame'of'the'coffee'unit.'Prior'to'loosen'the'anti-vibration'system'bolts,'it'is'necessary'to'disconnect'
the'wiring'and'the'pipes'of'the'fixed'part.'Proceed'thus:''
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1) Extract'the'feed'and'drain'pipes'of'the'water'
tank;''
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2) Disconnect' the' outflow' pipes' from' the' steam'
exchanger;''
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3) Disconnect'the'drain'pipe;'
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4) Disconnect'the'connector'of'the'command'
keyboard;'
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5) Disconnect' the' power' cord' on' the' side' of'
where'the'main'switch'is;'
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6) Disconnect' the' empty' tank' micro' switch' and'
the'grounding'wire;'
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7) Disconnect'the'grounding'wire;'
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8) Extract'the'power'cord'from'the'side'passage;'

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9) Loosen'the'2'catch'bolts'right'and'left'of'the'
anti-vibration'dumpers;'
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10) Use'a'7'mm'tube'wrench;'
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11) Loosen'the'two'lower'right'and'left'catch'
bolts;'
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12) Disconnect'the'power'cord'of'the'LED'
diodes'from'the'connectors;'
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13) The'complete'unit'can'be'pulled'up,'delicately'extracting'it'from'the'appliance'frame.''''
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14) It'is'now'possible'to'easily'reach'all'the'components'of'the'coffee'machine.''
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G) FAST-ON&CONNECTIONS.&
The'fast-on'
connections'allow'for'
a'quick'and'safe'
connection,'and'make'
it'possible'to'quickly'
perform'maintenance'
on'the'hydraulic'
connections'of'the'
appliance.'
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To'use'them'properly,'
and'not'to'shorten'
their'life-time,'it'is'
advisable'not'to'use'
any'tools,'but'just'the'
fingers,'applying'
pulling'on'the'
junctions,'as'shown'in'
picture.''
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To'replace'the'pipe,'it'
is'sufficient'to'insert'it'
in'the'connection,'by'
pushing'as'shown'in'
picture.'&
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H) STEAM&ADJUSTMENT&
It' is' possible' to' perform' the' steam' adjustment' only' when' inspecting' the' appliance.' The' adjustment'
affects'the'water'intake'by'using'the'pressure'regulator.'If'it'is'necessary'to'intervene'on'the'exchanger'
or'the'hydraulic'circuit,'it'may'be'necessary'to'tune'the'adjustment'again.'Proceed'thus:''
On'the'adjustment'pin,'
loosen'the'locknut,'rotating'
it'counter-clockwise.''
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To'increase'the'pressure,'
rotate'the'pin'counter-
clockwise.'To'reduce'it,'
rotate'it'clockwise.'While'
performing'the'adjustment,'
perform'several'supplies'of'
steam'until'reaching'a'dry'
jet,'with'a'not'excessive'
pressure.''
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When'the'adjustment'is'
done,'tighten'the'locknut'
by'screwing'it'clockwise,'to'
fix'the'pin’s'position'on'the'
new'setting.'''
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I) FUSE&REPLACEMENT&
The'protection'fuse'is'located'within'the'EMI'RF'grid'filter;'to'access'the'contacts,'proceed'thus:''
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1. With'a'thin'screwdriver,'exert'traction'leverage'in'the'area'shown'in'picture,'until'the'
plastic'cover'dislodges.
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2. The'5x20'fuse'is'located'on'the'contacts'of'the'removed'cover;'it'must'be'replaced'with'a'
fuse' with' the' same' electric' characteristics,' as' shown' in' the' electrical' scheme.' When'
done,'replace'the'cover'in'its'seat.'''
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L) THERMOSTATS&RESET&AND&MANUAL&RE-ENGAGE&
It' may' become' necessary' to' re-engage' the' safety' thermostats' of' the' two' exchangers.' The' bi-metallic'
thermostat'of'the'steam'exchanger'is'easily'accessible,'while'the'thermostat'of'the'coffee'exchanger'is'
on'the'inside'of'the'coffee'unit.''
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If'the're-engaging'thermostat'opens,'it'may'cause'malfunctioning;'therefore,'follow'this'procedure'with&
all&due&safety&precaution.&&
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The're-engaged'
thermostat'will'have'the'
nut'protruding'by'about'1'
mm'from'its'seat.''
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Replace'the'nut'in'its'seat'
by'exerting'a'slight'
pressure,'as'shown'in'
picture.''
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M) KEYBOARD&REPLACEMENT
The' keyboard' can' be' replaced' by' simply' remove' the' safety' cover' of' the' protection' box.' Thus,' it' is'
possible'to'reach'the'circuit,'which'can'be'replaced.'Proceed'thus:''
1.'Remove'the'plastic'screw'with'a'medium'cross'
screwdriver,' on' the' left-hand' side' of' the'
protection'box;'
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2.'Remove'the'screw'from'its'seat;'
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3.' Exert' a' slight' traction' on' the' cover' until' it'
comes'loose;'
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4.' The' front' cover' of' the' protection' box' remains'
joined'to'the'glass,'free'the'keyboard'by'moving'it'
sideways'to'the'left'to'disengage'the'hook;'
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5.' Disconnect' the' flat' connector' from' the' relay'
chip,'with'a'slight'traction;''
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6.'Liberate'the'flat'cable'from'the'side'passage'of'
the'metal'sheet'and'replace'the'keyboard.''
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N) POD&DRAWER&REMOVAL
The' pod' drawer' can' be' removed' from' its' seat' by' removing' the' catch' screw' located' under' the' unit.'
Proceed'thus:''
1. Using'a'short'medium'cross'
screwdriver,'loosen'the'catch'
screw'as'shown'in'picture;''
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2. Remove'the'screw'completely'to'
liberate'the'drawer'guide;
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3. It'is'now'possible'to'remove'the'
pod'drawer'from'its'guide.''&
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