Ricoh FT5034 Service Manual page 104

PROBLEM
STATUS "54" 1. POWER RELAY POOR CONTACT
(READY SIGNAL NOT ON) 2. FUSING LAMP OPEN
3. FUSING CONTROL BOARD
4. MAIN BOARD MALFUNCTION
5. FUSING UNIT CONNECTOR POOR
STATUS "55" 1. FUSING THERMISTOR SHORT
(FUSING OVERHEAT)
CAUSE
MALFUNCTION
CONTACT
(The resistance of the thermistor becomes
below 500Ω.)
START
FUSING
LAMP Yes
ON?
No
POWER RELAY
No
12-15: 220V
Yes
FUSING UNIT
Yes
CONNECTOR
No
START
Yes
FUSING LAMP
Yes
ON?
No
CHECK THE
RESISTANCE OF
FUSING
THERMISTOR
- 103 -
ACTION
REPLACE THE
IS FUSING CONTROL
FUSING CONTROL
Yes
BOARD CN1-8 (LOW)
BOARD
No
REPLACE THE REPLACE THE MAIN
POWER RELAY BAORD
CHECK THE FUSING LAMP IS BLOWN
CHECK THE FUSING UNIT CONNECTOR
REPLACE THE
OPERATION PANEL
CHECK CN1-8 24V: REPLACE THE FUSING CONTORL
(FUSING CONTROL BOARD
BOARD) 0V: REPLACE THE MAIN BOARD
0 OHM: REPLACE THE FUSING
THERMISTOR
80 kOHM: REPLACE THE MAIN BOARD