5-12
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Jenn-Air Built-in Coffee System
DIAGNOSTICS & TROUBLESHOOTING
For Service Technician Use Only
Component Testing Chart
Unplug coffee system or disconnect power before performing
the following checks:
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A potential cause of a control not functioning is
corrosion on connections. Observe connections and
check for continuity with an ohmmeter.
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All tests/checks should be made with a VOM or DVM
having a sensitivity of 20,000 Ω per volt DC or greater.
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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.
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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% volt 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 TESTING CHART
COMPONENT
FROM
TO
VOLTAGE
RESISTANCE NOTES
Display PCB
Main Brd - J13
Main Brd - J13
Pin 1 = +5 VDC
Pin 2 = TX BUS (MAX 5V)
Pin 3 = TX BUS (MAX 5V)
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 Brd - J1-2
120 VAC
458k ohms
3-Way Valve is grounded to heat
exchanger support.
EV2, 2-Way Valve L1 Junction Block Main Brd - J1-1
120 VAC
444k ohms
2-Way Valve is grounded to
upper reinforcement, lower &
upper Main Brd cover, & heat
exchanger support.
Fan, Cooling
LED Fan PCB - J1 LED Fan PCB - J1 Pin 1 = +12 VDC (red)
Pin 2 = GND (black)
N/A
Digital motor - resistance cannot
be measured.
Flow Meter
Main Brd - J7
Main Brd - J7
Pin 1 - 2 = 5 VDC
Pin 1 - 3 = 0 VDC
Pin 2 - 3 = 5 VDC
N/A
Measures water used.
Grinder Motor
F2 (L1)
Main Brd - F7
120 VAC
13.1 ohms
Can only be adjusted while
grinding.
Hall Sensor
Main Brd - J8
Main Brd - 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 Brd - F9 (N) 120 VAC
11.5 ohms
Dual heater element (23.ohms/
heater). Check TCO's if circuit
is open.
Steam Heater
L1 Junction Block Main Brd - F8 (N) 120 VAC
15.4 ohms
Check TCO if circuit is open.
Diverter Motor
Main Brd - J1-5
Main Brd - J1-3
140 VDC*
62 ohms
*Voltage polarity reverses to
drive the motor up & down.
Power In (Main
Board)
Main Brd - F4 (L1) Main Brd - F5 (N) 120 VAC
N/A
Main Brd AC IN
Power In (LED
Fan PCB)
LED Fan - F1 (L1) LED Fan - F2 (N)
120 VAC
N/A
LED Fan PCB AC IN
NOTE:
When each switch is activated, the control will beep (sound a tone).
Содержание JBC7624BS
Страница 1: ...JC 01 TECHNICAL EDUCATION Built in Coffee System JOB AID W10647095 JBC7624BS...
Страница 10: ...1 6 n Jenn Air Built in Coffee System GENERAL INFORMATION Notes...
Страница 26: ...2 16 n Jenn Air Built in Coffee System OPERATION Notes...
Страница 39: ...COMPONENT ACCESS Jenn Air Built in Coffee System n 4 7 Jenn Air Built in Coffee System Disassembly Section...
Страница 76: ...Jenn Air Built in Coffee System W10647095...