Dent-X Processors
vice Personal ONLY
Observe ALL safety Procedures in the service manual
Reference: Installation, Operation and Maintenance Manual
Table of Contents
1. Over Heated Developer or Prolonged Processing Time___________1
2. No Developer Heat_______________________________________2
3. Motor is not Working_____________________________________3
4. Fan or Heater are not Working______________________________4
5. Pumps are not Working____________________________________5
6. Machine is Running Continuously____________________________6
7. Display Panel Problems__________________________________7-8
8. Solenoid is not Working Properly____________________________9
9. Resistances reference and parts numbers for 230V Processors____10
Key
> Greater Than
< Lower Than
= Equal To
About the Same
Note: If you have 220V film processor, please consult page 10 for common
resistance values and parts numbers.
1) Dark Film: Over Heated Developer or Prolong Processing Time
810 Basic/ 810 plus/Excel/ 9000
Temp > 83
° F Temp 83° F
Sensor not in place Sensor in place
Processing time > 4.5 min Processing time < 4.5 min
Resistance Good Resistance Bad
Temp = 83
° F Temp > 83° F
Note: Dark films can also be associated
with light leaks in the darkroom or
with wrong filter in safelight.
1
Developer Temp
Resistance
F C
K
Ohms
97 36.1 9.5
95 34.9 9.75
93 33.8 9.95
91 32.6 10.5
89 31.5 11
87 30.4 11.6
85 29.3 12.4
83 28.2 13
81 27.3 12.5
80 26.8 13.8
76 24.4 14.8
74 23.3 15.6
72 22.2 16.25
Check if temperature of the
developer is more than 83
° F.
If the temperature is in the required range
than the reason for the dark film might be
associated with a prolong processing time.
Change processing speed to 4.5 minutes
and check that the length of the cycle is 4.5
minutes by inserting a new film.
Rotate VR1 in the
control box clockwise
to increase the speed
(40sec/turn).
If processing time is 4.5 minutes but films are still too
dark the problem might be with the X-Ray tube head.
Decrease exposure time or troubleshoot the tube head.
Rotate VR1 in the control
box counterclockwise to
reduce the speed
(40sec/turn).
Check that the temperature
sensor is in place.
Place sensor in
place and wait
few minutes.
Replace Sensor
P/N: 876-060107 (810
Basic/Plus/ 9000)
P/N: 876-060107-K
(Excel)
Replace the PC board
P/N: 807-040811 (Basic)
P/N: D22-90-13027 (Excel/810Plus)
P/N: 807-040812 (9000)
Machine is good. If films are still too dark the
problem might be with the X-Ray tube head.
Decrease exposure time or troubleshoot the
tube head.
Rotate VR4 in the control
box counterclockwise
(6
° F/Turn) to decrease the
temperature to 83
° F. Wait
few minutes and measure
the temperature of the
developer.
Check the resistance
of sensor according
to the table below.
Film too dark
2) No Heat-Low Temp Light doesnt Come off
810 Basic/ 810 Plus/ Excel/ 9000
2
Good Voltage No or low voltage
Good Resistance Bad Resistance
Good Resistance Bad Resistance
Temp
83°F Temp << 83°F
Check the resistance of the heating
pad. It should be between 70-80
Check the voltage going
to the heating pad on the
heating pad plug
Check resistance of the
temperature sensor. It should
be 16 K
±10% for developer
temp of 73
°F (room temp)
Replace the heating pad
P/N: 865-062007
Replace temperature sensor
P/N: 876-060107 (810 Basic/9000)
P/N: 876-060107-K (Excel/810 Plus)
Calibrate heating pad by rotating
clockwise VR4 on the control box (6
°F/Turn) to obtain 83 °F. Measure the
developer temperature before to know
how many turns are required.
Wait from few up to 45 minutes (depending on the room
temperature) and check that the developer temperature is 83
°F.
Replace the Logic Board
P/N: 807-040811 (810 Basic)
P/N: 807 040812 (9000)
P/N: D22-90-13027 (Excel/810 Plus)
Note: If you came to the conclusion that the PC
Board has to be replaced you can also replace the
entire control box.
The differences are the prices and the lengths of
warranty. The PC Board carries three months
warranty while the control box has twelve months
warranty.
P/N: 863-012107 (Control Box of 810 Basic).
P/N: 863-012507 (Control Box of 810 Plus).
P/N: 866-012007 (Control Box of 9000).
P/N: 863-012007-1 (Control Box of Excel)
Replace the Logic board
P/N: 807-040811 (810 Basic)
P/N: 807 040812 (9000)
P/N: D22-90-13027 (Excel/810 Plus)
Machine is good. If the films are still to light the
problem might be with the X-Ray tube head:
Decrease the exposure time or troubleshoot the tube
head. Another option is a weak chemistry due to no or
low replenishment rate.
Background: The temperature sensor records the developer temperature and sends a resistance reading to the
control box in inverse proportion: High Temp-Low Resistance or Low Temp-High Resistance. Once the
resistance is high, i.e.: the temperature of the developer is low, the control box should be sending voltage to
the heating pad to heat the developer. The low temp sensor would be turned off automatically once the
developer temperature is between 80
°F-83°F. The voltage going to the heating pad when the low temp light
is blinking is line voltage (115V).
Film is too light
3) Motor Not Working
810 Basic/ 810 Plus/ Excel/ 9000
3
Resistance Good Resistance is Bad.
Motor is working Motor is not working
Good Fuse Bad Fuse
Voltage No Voltage
Replace Motor
P/N: 865-010307 (810 Basic/ 810 Plus/9000)
P/N: 803-000026 (Excel)
Since the resistance of the voltage is good and it
receives voltage from the control box, there might be a
problem with the transport racks or with the gearbox
(810 series/9000). Make sure that all racks are clean
and can be rotated freely by hand. Inspect all gears and
sprockets to detect wear on their teeth. Make sure all
rollers are turning and in place and that the drive chains
(810/9000) are installed correctly. If you have
determined that the racks are not the problem, you
would have to replace the main drive chain/drive shaft.
P/N: 865-070007 810/9000 (Main drive chain kit)
P/N: 803-000018 Excel (Drive shaft assembly)
Replace Fuse F1
P/N: 0000032089
Replace Motor
P/N: 865-010307
(810 Basic/ 810 Plus/9000)
P/N: 803-000026
(Excel)
Replace Logic board.
P/N: 807-040811
(810 Basic)
P/N: 807-040812
(9000)
P/N: D22-90-13027
(Excel/810 Plus)
Plug the motor back and check
DC voltage across the motor plug
that is located in the control box
and has brown and blue wires.
The DC voltage should be
32V
(810Basic/Plus/9000) and
90V
(Excel).
Check fuse F1 in the control box
Remove all racks and see if
the motor shaft is turning.
Check the resistance of the motor between:
a) The vertical pins. It should be 45-55
for the
810 Basic /Plus / 9000 machines, and
150 for the Excel.
b) The diagonal pins: 0
for all machines.
c) The horizontal pins: 0
for all machines
Note: If you