Key Sequence Of Operation - Blodgett C70 Service And Repair Manual

ACCELLIS C70
KEY SEQUENCE OF OPERATION --- FAILURE MODE ANALYSIS
Unit will perform self test of component func-
tions.
1. No display. Check items:
#2 (fuse)
#4 (24VDC power supply).
#9 (SMT controller board). Check for 5 VDC on
P5 pin 1+ & 3---.
NOTE: Check cable connections.
2. Door interlock switch error. Check items:
#5 (primary & monitor door switch) (secon-
dary switch on left side of oven not shown.)
#6 (K2 relay)
#1 (circuit breaker)
See page 4---5.
3. Mag current low. Check items:
#1 (circuit breaker) (CB1)
#3 (convection high heat OT)
#6 (K3 relay filament heat)
#8 (K4 SS relay for magnetron)
#13 through #17.
NOTE: Reference page 6 ---4 and 6 ---6 for
component testing.
4. Mag Fluc Low. Check items:
#12 (stir motor)
# 9 (SMT controller board RF cable connec-
tion.)
#13 through #17
NOTE: If (RF) value on display is (0 or 1). No
RF power is present. If (RF) value is
displaying a number value like (60)
with little fluctuation then check item
#12 (Stirrer fan in launcher tube may
need to be inspected. This involves re-
moving the quartz seal.)
NOTE: Reference page 6 ---4 and 6 ---6 for
component testing.
5. Mag Thermo SW. Check items:
#17 (magnetron)
#11 (magnetron cooling fan.)
NOTE: Attached to back of the magnetron is
the Mag thermo snap disk.
6. Blower motor defective message. Check
items:
#18 Blower motor speed controller.
#19 Convection (blower) motor
NOTE: Reference pages 5 ---5 and 5 ---6 for
BMSC defective messages.
7. Heat Exchanger Thermo OPEN. Display
shows the # 999. Check items:
#9 (SMT controller board connector (J2) pins
#37 & #38).
NOTE: Check pin connections.
NOTE: Reference pages 4 ---2 through 4 ---4.
8. CC Heat thermo OPEN. Display shows the
# 999. Check items:
#9 (SMT controller board connector (J2) pins
#37 & #38).
NOTE: Check pin connections.
NOTE: Reference pages 4 ---2 through 4 ---4.
9. Heat Rise Low. Check items:
#7 (K7 SS relay for heater)
#18 (convection motor controller)
NOTE: Reference pages 4 ---2 through 4 ---4.
for heater testing information.
4---1