For Service Technician Use Only
COMPONENT TESTING
JennAir Built-in Coffee System
n
3-9
Component Testing Chart
Unplug coffee system or disconnect power before performing the
following checks:
■
A potential cause of a control not functioning is corrosion
on connections. Observe connections and check for
continuity with an ohmmeter.
■
All tests/checks should be made with a VOM or
DVMhaving a sensitivity of 20,000 Ω per VDC or greater.
■
Check all connections before replacing components,
looking for broken or loose wires, failed terminals, or
wires not pressed into connectors far enough. Damaged
harness must be entirely replaced. Do not rework a
harness.
■
Resistance checks must be made with power cord
unplugged from outlet, and with wiring harness or
connectors disconnected.
Do not continue with the diagnosis of the appliance if a fuse is
blown, a circuit breaker is tripped, or if there is less than
120 +10%/-15% V power supply.
The coffee system must be unplugged or the power disconnected
when measuring resistance.
When checking for proper voltage, complete the following steps:
1.
Disconnect power.
2.
Connect voltage measurement equipment.
3.
Reconnect power and confirm voltage reading.
4.
Disconnect power after performing voltage measurements.
COMPONENT
FROM
TO
VOLTAGE
RESISTANCE NOTES
UI/Display PCB
Main Board - J13
Main Board - J13
Pin 1 = +5 VDC
Pin 2 = TX BUS (MAX 5 V)
Pin 3 = TX BUS (MAX 5 V)
Pin 4 = GND
Pin 5 = -7 VDC
Pin 6 = DATA OUT (MAX 5 VDC)
Pin 7 = DATA IN (MAX 5 VDC)
Pin 8 = CLOCK (MAX 5 VDC)
N/A
Connector going to Display
PCB. Supplies circuit
ground, +5 VDC, -7 VDC and
transmission lines.
NOTE:
12 VDC is provided
when measuring the
differential b5 VDC
and -7 VDC.
EV1, 3-Way Valve
L1 Junction Block Main Board J1-2
120 VAC
458K ohms
Drain Valve is grounded to
heat exchanger support.
EV2, 2-Way Valve
L1 Junction Block Main Board J1-1
120 VAC
444 ohms
Water Valve is grounded to
upper reinforcement, lower
and upper Main Board cover,
and heat exchanger support.
EV3, 2-Way Valve (Hot
Water)
L1 Junction Block Main Board - F10
120 VAC
444 ohms
Valve is grounded to upper
reinforcement, lower and
upper Main Board cover, and
heat exchanger support.
Fan Cooling
LED Fan PCB - X3
LED Fan PCB - X3
Pin 1 = +12 VDC (red)
Pin 2 = GND (black)
N/A
Digital motor - resistance
cannot be measured.
Flowmeter
Main Board - J7
Main Board - J7
Pin 1 - 2 = 5 VDC
Pin 2 - 3 = 0 VDC
Pin 2 - 3 = 5 VDC
N/A
The Flowmeter measures the
water used.
Grinder Motor
F1 (L1)
Main Board - F7
120 VAC
13.1 ohms
Can be adjusted only while
grinding.
Hall Sensor
Main Board - J8
Main Board - J8
Pin 1 = +5 VDC (black)
Pin 2 = Signal (max 5 VDC)
(gray)
Pin 3 = GND (gray)
N/A
Current sensor on the
diverter motor assembly that
identifies the position of the
diverter motor.
Coffee Heater
L1 Junction Block Main Board - F9
(N)
120 VAC
11.4 ohms
Dual heater element (23
ohms/heater). Check TCOs if
circuit is open.
Steam Heater
L1 Junction Block Main Board - F8
(N)
120 VAC
15.4 ohms
Check TCO if circuit is open.
Group Infusion Motor
J1-5
J1-3
140 VDC*
62 ohms
*Voltage polarity reverses to
drive the motor up and down
