Goldstar MV-1304B, Service Manual

Page: 32 / 44

7-21
PROBLEM
-C
:
Displa
y
does not star
t countdo
wn when ST
AR
T k
e
y
is touched.
PROBLEM
-D
:
Unit oper
ation
seems to be nor
mal
b
u
t
little or
no heating is produced in o
v
en load.
Chec
k:
1.
T
OUCH KEY BO
ARD (ST
A
R
T
KEY FUNCTION)
Chec
k:
1.
AIR
VENTS
1 1
Chec
k contin
uity of connector
CN2 betw
een Pin 1(PK) and
pin 3(BL) when the door is closed
Chec
k oper
ation of f
a
n
motor when ST
AR
T k
e
y
is touched.
Contin
uity
OK
Chec
k contact of
connector S1
Contact
OK
Replace
Circuit board
Correct seating
Nor
mal
circuit board
Nor
mal
contact
P
oor
contact
Nor
mal Pr
imar
y
s
w
itch
No
contin
uity
Adjust or replace door
sensing s
w
itch.
Measure resistance
of H.V
.capacitor
(see page 7-16)
Resistance
incorrect
Nor
mal
resistance
Nor
mal
oper
ation
No
oper
ation
Replace
ther
mostat
Nor
mal
ther
mostat
Measure resistance
of f
an motor
38
8 ohms
Resistance
incorrect
Replace
fan motor
Nor
mal
fan motor
Nor
mal
circuit board
Replace
circuit board
Nor
mal
resistance
Replace H.V
.C
.
Nor
mal H.V
.C
.
Nor
mal
magnetron
Replace
magnetron
Nor
mal
oper
ation
No
oper
ation
THERMOST
A
T
J
umper across
ter
m
inals of
THERMOST
A
T
b
y
using jumper lead
Runs
Runs
Runs
Runs Runs
Runs
Runs
Runs
33