Pentax EPK-P User manual

SERVICE MANUAL
(Version 00)
High cost performance Video Processor
PENTAX EPK-p (type-C)
MNL-049-00 / September 4, 2009

< CONTENTS>
Page
1. Specifications............................................................................. 1
2. General explanations................................................................. 2
3. Functions.................................................................................... 2
Function diagram........................................................................ 4
4. Configuration (Main parts) ........................................................ 5
5. Precaution ................................................................................ 6
6. Service
6.1 Lamp (LP1, LP2) replacement ............................................. 7
6.2 Lamp harness (B510, 511) replacement ............................. 7
6.3 Electrical adjustment
6.3.1 Iris adjustment ............................................................... 8
6.3.2 Pump adjustment ........................................................... 9
7. Electrical safety test
7.1 Dielectric strength test.......................................................... 10
7.2 Protective GNDing wire resistance....................................... 10
7.3 Leakage current test............................................................. 11
8. Trouble shooting......................................................................... 12
9. Wiring diagram........................................................................... 13
Appendix – Exploded view
Parts list
Notes for this Service Manual
1) This service manual must be handled as confidential. Copy of the manual must be under your
control. In the case the maintenance contract expires, the original and all of the copied manuals
must be returned to HOYA.
2) A person who will service the product must receive service training from HOYA or a person who
has been authorized by receiving the training from HOYA.
3) Up-date of Service Manual will be notified by such information as Notice of Modification, Service
Note and so on.
4) When you start repair servicing, be sure to leave service records.
5) This Service Manual voids preceding "New Product Repair Guide" for the same model, if any.

- 1 -
1. Specifications
Item Description Specification
Voltage 120VAC 230VAC
Frequency 50 - 60Hz
Power consumption Less than 2.8A Less than 1.4A
Power requirement
Voltage fluctuation +/-10%
Video system NTSC PAL
Temperature 10 – 40 ℃
Relative humidity 30 – 85 % (without condensation)
Operation environment Atmospheric pressure 700 – 1060 hPa
Temperature -20 – 60 ℃
Relative humidity 0 – 95 % (without condensation)
Storage environment Atmospheric pressure 700 – 1060 hPa
Lamp 150W halogen lamp x2
Lamp average life span 50 hours
Color temperature 3,400K
Iris control Automatic / Manual
Illumination
Brightness control Adjustable by +/- 5 steps each
PENTAX Color Video
Endoscope K-series (K-series with Y/C output)
Scope compatibility PENTAX fiber scopes With use of appropriate fiber scope video adapter
module.
Color system Red and Blue each adjustable by +/- 5 steps each
RGB 9pin D-sub x 1
Y/C OUT S terminal x 2
Composite BNC connecter x 1
Output signal Analog
output Y BNC connecter x 1
Remote Stereo mini plug x 2
Keyboard 6-pin Mini-DIN x1
Control signal Serial signal USB x1
Air pump system DC Diaphragm
Pressure setting
at flow rate at 0 45 – 72 Kpa (maximum pressure)
Air feeding system Standard air feed volume
at inlet of the
water bottle Low: 2.0 – 4.0 L/min
High: 4.1 – 7.0 L/min
Electric shock protection Class – I equipment, 3 prong plug
Degree of protection
against electric shock BF type, using insulated endoscope Use on a heart is prohibited
Classification electro
medical equipment Degree of explosion
proofing Do not use in potentially flammable surroundings.
Electromagnetic
Interference Electromagnetic compatibility EN60601-1-2(2001+A1:2006) for EU
IEC60601-1-2 (2001+A1:2004) for other countries
Medical electrical
equipment general
requirement for safety
UL60601-1 IEC60601-1
Size Dimensions 380mm (W) x 430mm (D) x 155mm (H)
Weight Main body 11.0 Kg
Table-1 Specifications

- 2 -
2. General explanations
The PENTAX
E
EP PK K- -p p
has a halogen lamp as a right bulb that costs relatively less. However it is
compatible with not merely the ordinary 70K/80K series scopes but also 90K series scopes, which is a
high-cost performance video processor. No unnecessary things are equipped. All minimally-necessary
functions are installed. While following these features of Type-A, B, some points were improved in terms
of its profitability, productivity and functionality.
1) Light source>A halogen lamp 150W is introduced as a light source. Its life time is 50 hours. Two
halogen lamps are mounted on the lamp rotary disk inside. The two lamps can be selected with the
lamp selector. Upon operation the lamp selector the lamp rotation disk driven by a DC motor
revolves so the selected lamp goes to the light axis. In the case that the lamp wore out of light, the
warning message “Please replace the lamp 1 (or lamp 2)” appears on the monitor and SERVICE
indicator lights in red. The lamp is replaceable from the lamp house lid located on the left side of the
unit. Comparing with Type-A, B, the lamp rotation disk is redesigned in order to withdraw the lamp
outside when the lamp is replaced. It contributes to easier lamp replacement. The construction of
the lamp rotation disk was modified so that the rotation disk adjustment is no longer necessary.
2) Contrast> By changing the linearity of the Y luminance signal, contrast of the image can be
changed in the EPK-p. Contrast changes cyclically by pressing “F9” key “Normal” > “High” > “Low”.
3) Starting lamp> The lamp can light by not merely pressing “LAMP” button but also setting the lamp
start mode. In the case that the item “Lamp” on “Setup” tab of “Configuration Screen” actuated by
pressing “F10” key is set with “Start”, the lamp lights when the main power is turned ON. With “Lock
lever”, it starts when the scope lock lever is completely locked. With “OFF”, “LAMP” button must be
pressed to turn on the lamp.
4) Mirroring, Rotating images> The image can be mirrored or rotated and displayed on the monitor.
In the case that the item “Image Direction” on “Display” tab of “Configuration Screen” actuated by
pressing “F10” key is set with “MIRROR”, the image is displayed in mirrored status. With “ROTATE”,
it is displayed rotated. With “Normal”, this is default.
In addition to these former futures,
5) Scope image> Although the subjective analysis, it is generally evaluated that the observing image
is improved with richer color.
6) DC power supply unit> To simplify the structure, DC power supply units previously independently
available (for the patient circuit, secondary circuit and lamps) were combined into one unit.
Accordingly the isolation transformer was removed.
7) Rear panel> No paint is applied to the rear panel. It shines in silver, but is coated with nickel. Thus
it is not likely to rust.
3. Functions (Refer to Fig-1 Function diagram)
1) Process Board (E700)
Process board (E700) consists of the seven parts in terms of its function. These are (1)Preprocessing
part, (2)Processing part, (3)CPU part, (4)Encoding part, (5)Peripheral control part, (6)DC power supply,
and (7)I/O part.
(1) Preprocessing part >
•This part has photo couplers to isolate the patient circuit and the secondary circuit.
•Y/C signal from the K series scope is converted into 10 bit YCrCb signal.
•The scope data is transferred to CPU part through the photo couplers by the serial transfer and
vice versa.
(2) Process part >
•FPGA and video memory are available. 10bit YCrCb signal is converted into 10 bit R, G, B signal
and transferred to Encoder part for analog Y/C and RGB signal.
•Fixed characters like “AGE” stored in the CPU memory and entered characters by the keyboard are
transferred from the CPU part and merged with the image in the FPGA.
•At iris auto mode, luminance signal extracted from 10 bit YCrCb signal and the reference voltage
from the CPU are compared in the FPGA and FPGA calculates and sends the iris drive voltage to
Peripheral control part to control the iris in auto mode. At iris manual mode, the reference voltage
from the CPU is converted into the iris drive voltage and sends it to also Peripheral control part to
control the iris in manual mode.

- 3 -
•Image signal YCrCb is processed with enhancement, noise reduction, frozen image and Red and
Blue gain in the FPGA.
•Digital signal for pump transferred in serial from the CPU part is converted into analog signal and
sent to Peripheral control part to control the pump.
(3) CPU part >
•Stores the fix characters like “AGE” and manages entered characters from the keyboard. Sends
them to the Processing part to merges them to the image data in the FPGA on the Process part.
•Manages a real time clock.
•Analog signal that varies depending on which button on the front panel is pressed is converted into
digital signal and sent to the CPU. The CPU sends the instruction depending on the digital signal
by the serial transfer to the Process part.
•Sends the trigger signal to the out control ports through I/O part.
(4) Encoding part >
•10 bit R,G,B signal is encoded into Y/C, RGBS, and composite video signals and sent to I/O part.
(5) Peripheral control part >
•Detects the scope lock signal and lamp door switch signal.
•Controls the lamp power supply part of the unit (PS1), Sensor board (O700), the iris motor (MOT1)
and Pump(PM1).
•Supplies Unit fan (FAN3) and Blower fan (FAN2) with DC power.
•In the case detecting the error signal from Unit fan (FAN3) when the fan stops by accident, it
controls to shut down Lamp power supply (PS4)
(6) DC power supply part >
•Receives DC 12V and converts to 3.3V and 5V with the DC/DC converter and the three terminal
regulator.
(7) I/O part >
•The output levels of the video signals Y/C, RGBS and composite video is adjusted to the video
signal standards by the video amplifier.
•Trigger signals go through this part.
•Video connectors, trigger ports and keyboard connector are connected to this part.
2) Integrated power supply unit (PS1)
This DC power supply unit consists of the following three parts in terms of the DC voltages.
•Supplies +5, +15VDC to the patient circuit part of Process board (E700). Because this part is
connected to the patient circuit that is isolated from the secondary circuit of Process board it is also
isolated from the chassis grounding level.
•Supplies +12VDC to the secondary circuit part of Process board (E700).
•Supplies +15VDC to the lamp.
3) Sensor board (O700)
It is located just behind the lamp rotary disk and detects which lamp (No.1 or 2) is in the light axis
position. It has two photo sensors on it. It differentiates the two lamps by the one of the two sensors
being interrupted by a tab on the lamp rotary disk.
4) Lamp rotation disk
Lamp holding structure with sliding plates is available. The disk is driven by a gear and motor (MOT1).
The rotation is controlled by the position sensors (above) but limited with stoppers on the disk.

- 4 -
Y/C
SCPDO
SCPDI
YCrCb
[
9..0
]
SCP RX
SCPTX
DB[15..0]
A[16..1]
CPU partCPU
ROM
RAM
Keyboard I/F
RTC
A/D
R, G, B
[
9..0
]
Encoding part
Video encoder
Preprocess part
Patient circuit
(isolator)
Video decoder
Process part FPGA
Video memory (SD-RAM)
YCrCb > R,G, B
Character generator
Calculation for Iris
Noise reduction
Enhancement
Freeze image
Pump D/A
Serial control
Scope connector Photo
sensor
(PHC1)
Battery
CR17335SE
Integrated power supply unit
(PS1)
Front panel
board (F700)
Power
switch
(SW1)
Noise
filter
(LF2)
Rear fan
(FAN1)
Interlock
switch
(SW2) BNC
(CN17)
BNC
(CN18)
Y/C
(CN19)
Y/C
(CN20)
RGB
(CN21)
Trigger 2
(CN22)
Keyboard
(CN24)
Trigger 1
(CN23)
Lamp 1
(LP1)
Lamp 2
(LP2)
Lamp selector
(SW3)
Motor
(MOT1)
Lamp rotary disk
Sensor board
(O700)
Lamp
ON-OFF
control
Iris control
12VDC
Err
o
r
detect
i
o
n
Calculated signal for iris
Pump control
Sco
p
e lock
Lamp control
Front panel signal-1
Front panel signal-2
Signal for LED indication
5V, +/-15VDC to
patient circuit
5, +/-15VDC from power
supply PS2
Fuse (FU1) L
Fuse (FU2) N
IA12V
IA33V
IA5V
Y
C
R
G
B
S
Process board (E700)
Trigger 1, 2
Keyboard
USB D+, D-, V
AC input
< EPK-p Type-C Function diagram >
Fig-1 Function diagram
P
ump
control
Iris motor
(MT1)
for Lam
p
s
for Patient circuit
for Secondar
y
circuit
12VDC to
secondary circuit
12VDC from
p
ower su
pp
l
y
PS2
Pump
(PM1)
Blower fan
(FAN2) Unit fan
(FAN3)
12VDC
USB
(CN34)
I/O part
Video
amplifier
DC power supply part
DC/DC converter
>>3.3V
Three terminal regulator
>>5.0V
Peripheral control part
S/P converter
12VDC

- 5 -
Photo-1 Front left side view
4. Configuration (Main parts)
Process Board (E700)
Pointing blinded parts
Pump (PM1)
Mechanical block
Mechanical block
Lamp harness No.2
(B511 / black)
Lamp harness No.1 (B510 / white)
Lamp No.1 (LP1)
Sensor board (O700)
Motor (MOT1)
Lamp selector (SW3)
Lamp selector (SW3)
Iris unit (MT1)
Noise filter (LF2)
Front panel board (F700)
Fuse (FU1, FU2)
Mechanical block
Integrated power
supply unit (PS4)
Interlock switch (SW2)
Scope lock sensor (PHC1)
Process Board (E700)
Pointing blinded parts
Lamp No.2 (LP2)
Lamp rotation disk
Rear fan (FAN1)
Blower fan (FAN2)
Rear fan (FAN1)
Unit fan (FAN3)
Power switch
(SW1)
Pump (PM1)
Photo-2 Rear right hand side view
Optical unit mounting base
Motor shaft stopper
Torque limiter

- 6 -
5. Precaution - Important
1) General
You have to take utmost care to follow the general rules and practice for safety in servicing electrical
medical equipment.
2) Power off before servicing
For electrical safety, make sure to disconnect the power cable before opening the cover.
3) Route of electrical wire
Be sure to keep the original routes of the electrical wires and the original positions of the cores.
Otherwise it may break the compatibility with the EMC regulation. You must put the wires back to the
original routes after the maintenance.
4) High temperature on the lamp
Just after turning off the lamp it may be hot. Be careful not to suffer heat injuries when replacing a
lamp or maintain parts around the lamp.
5) Electrostatic Discharge
To avoid the PCBs from getting damaged, wear anti-static protection such as a wristband and
discharge the electrostatic charge before servicing.
6) Disassembling parts
The procedures of disassembling the mechanical and electrical parts are not described in detail in the
service manual. Unless otherwise mentioned, detach from the outer parts to the inner parts or from the
upper parts to the lower parts. In the case a special technique is necessary, it is described. You can
refer to the exploded view pages as well.
7) Optical unit mounting base
It is made of PC+ABS (Polycarbonate, ABS resin) and parts as the lamp rotation disk are held with
self-tapping screws. Thus tightening the self-tapping screw several times may screw up the mounting
base, especially the screw holes in the base. Be careful not to spoil the screw holes by obliquely
screwing the screws. If spoiling the screw hole it is necessary to remove the base with new one.
8) Electrical safety test
Be sure to do the following tests when you did a repair by opening the cove, after putting back all of
the disassembled parts and the cover to the original position. The procedures are described in the
following pages.
a) Dielectric strength test, b) Protective earthing circuit resistance, c) Leakage current tests

- 7 -
6. Service
Note: 1) Refer to Photo-1, 2, Fig-1 for the location of the parts to be replaced.
2) If any Numbers shown in the photo, they correspond to the numbers of the items listed below.
6.1 Lamp (LP1, LP2) replacement
A way of replacing the lamp bulb is described below.
Caution: Just after turning off the lamp, it may be hot. Be careful not to get hest injury.
1) Select the lamp that you want to replace with the lamp selector while the power of the unit is ON.
2) Turn of the power of the unit and remove the lamp house lid by unscrewing the screw located on the
upper center of the lid.
3) Pull the lamp holder tab while lifting the ratchet until the lamp drops off.
4) Remove the worn out lamp from the lamp socket and attach a new lamp to the socket.
Caution: 1) Do not contaminate the lamp bulb with finger prints or something. It may cause a lamp trouble.
2) Attach the lamp to the socket so that the protrusion on the lamp reflector edge faces inside.
5) Put the lamp to the lamp holder so that the lamp reflector settles the hole in the holder, especially the
protrusion meets the groove.
6) Push the lamp holder tab until it latches.
7) Close the lamp house with the lid by screwing the screw.
Caution: A bar on the back of the lamp house lid is available, which turns off the interlock switch for the lamp
ignition. Thus securely close the lid.
6.2 Lamp harness (B510, 511) replacement
The order of connecting the lamp harnesses to
the terminal of the power supply unit must be kept
as shown in Photo-4.
1) Connect Lamp harness No.1 (B510/white) so
the number attached to the wires “1” and “3”
correspond to the terminal position “L1+” and
“L1-“ as shown in Photo-4.
2) Connect Lamp harness No.2 (B511/black) so
the number attached to the wires “2” and “4”
correspond to the terminal position “L2+” and
“L2-“ as shown in Photo-4.
3) Lift ratchet
3) Pull tab while
lifting ratchet.
5) Put lamp so reflector
settles hole in holder
5) Protrusion faces
groove
6) Push lamp
holder tab
Hole in lamp holder
Photo-3 Lamp replacement
Lamp reflector
Lamp socket
For better referring inside, without cover
Photo-4 Lamp harness
Referred b
y
Photo
-
4
Terminal
L1+
L1-
L2-
L2+
Wire number
1, 2, 3, 4
Lamp harness
No.1 Lam
p
harness No.2

- 8 -
6.3 Electrical adjustment
Preparation
Set a jumper to STB2 to disengage the lamp internal lock switch, and set Jig mode by putting a jumper to
STB3. Refer to Photo-5.
Note: When opening the cover, it is necessary to remove the screw which is available under the lamp house lid.
6.3.1 Iris adjustment (necessary when the iris unit or Process board was replaced)
6.3.1-1 Hole element current adjustment
1) Connect the probes of the meter to TP25(+) and TP26(common).
2) Adjust VR500 so that the voltage attains +800mVDC+/-20mV.
6.3.1-2 Iris position adjustment
1) Press “EXPOSURE CONTROL” button on the front panel to select the iris mode “MANUAL”.
2) Press “BRIGHTNESS down” button on the front panel repeatedly until the brightness level becomes
“-5”.
3) Enter key command “Ctrl+J” (common between NTSC & PAL) to show the color bar chart.
4) Adjust VR501 so that the edge of the iris plate just touches Close position stopper bar (Left one as
seen from the lamp side). Refer to Photo-6.
5) Press “BRIGHTNESS up” button on the front panel repeatedly until the brightness level becomes “+5”.
6) Enter key command “Ctrl+J” (common between NTSC & PAL) to show the color bar chart.
7) Adjust VR502 so that the edge of the iris plate just touches Close position stopper bar (Right hand side
one as seen from the lamp side). Refer to Photo-6.
8) Confirm if the iris plate stays in about the center between the two stoppers after selecting the
brightness “+/-0” and the color bar chart is displayed by entering the key command “Ctrl+J”. Turn off
and on the unit and turn on the lamp for the next confirmation.
9) Connect a scope and check if the iris properly works in accordance with the iris manual operation
(changing the brightness by pressing BRIGHTNESS button).
10) Check if the iris properly works in iris auto mode.
11) Turn off the unit and disconnect the jumpers set before.
12) Put back the cover and perform the electrical safety tests.
VR500
VR502
VR501
TP26
TP25
STB2
STB3
Photo-5 VR & TP on Process board
Close position stopper Open position stopper
Edge of Iris plate
Iris plate
Photo-6 Iris position adjustment
The iris is located behinds the scope
connector and it is visible from above after
removing the bridge plate (black plastic one).

- 9 -
6.3.2. Pump adjustment (necessary when the pump unit or Process board was replaced)
1) Connect the air outlet of the EPK-p to the air flow meter with the tube ST-7022 as shown in Photo-7.
Caution: Confirm if there is no air leakage in the air route from the pump to the meter. If the adjustment is
continued without perceiving the leakage, it may overload the pump.
2) Turn on the power of the EPK-p and enter the key command “Ctrl + Alt + Shift + P” with the key board
to show “Pump Level” menu on the monitor. Refer to Fig-3 below.
3) Press “PUMP” button on the front panel to turn on the pump.
4) Press “PUMP POWER” button repeatedly until the pump level “Low” is selected.
5) Press the down arrow key to select the pump level “Low” identified by the triangle mark in the menu.
6) Press the left or right-pointing arrow key so that the air flow value indicated on the flow meter attains
2.5±0.1L/min.
7) Press “PUMP POWER” button repeatedly until the pump level “High” is selected.
8) Press the up arrow key to select the pump level “High” identified by the triangle mark in the menu.
9) Press the left or right-pointing arrow key so that the air flow value indicated on the flow meter attains
4.5±0.1L/min.
10) Turn off the power of the unit and wait for 30 seconds, and then turn on the power again.
11) Confirm if the air flow values at “High” and “Low” level have been adjusted to the specified values.
12) Change the connection of the air outlet from the flow meter to the air pressure meter.
13) Measure and record the air pressure values at both “High” and “Low” level.
14) Detach the air pressure meter, jumper pins set at “Preparation” and close the outer cover.
15) Perform the electrical safety tests.
Photo-7 Air flow & pressure meter
Air pressure mete
r
Flow meter
Air outlet of EPK-p
ST-7022
Pump Level
High> 193
Low> 144 Fig-3 Pump Level menu

- 10 -
7. Electrical safety test
Important: After opening the cover of the unit for repair, the electrical safety test is indispensable.
7.1 Dielectric strength test
Caution: 1) Be sure to keep away from the equipment while the high voltage is being applied to the EPK-p.
2) This test is one kind of destructive tests. Multiple tests may damage the EPK-p.
1) Connect the probes of the dielectric strength tester according to Table-2. Refer to Fig-4 for the
connection.
2) Set the voltage according to Table-2, applying HV time to 60 seconds and the cut off current to 15mA,
then start the test by pressing the start button on the tester.
3) Confirm that there is no break down during the test period 60 seconds.
No. Dielectric strength test Probe (+) Probe (-) Apply voltage
1 Primary circuit to Chassis Point-A Point-B 1,500VAC
2 Primary circuit to Patient circuit Point-A Point-C 4,000VAC
3 Signal terminal to Patient circuit Point-C Point-D 1,500VAC
Point-A: Point of shorted together with the live and neutral terminals of the AC cable.
Point-B: Equipotential terminal of the EPK-p.
Point-C: Equipotential wire of the dummy scope for dielectric strength test.
Point-D: Video signal BNC connector (outer shell) of the EPK-p.
7.2 Protective earthing circuit resistance
Measure the protective earthing circuit resistance with a low resistance meter and check whether it is within
the value described below: Refer to Fig-5.
1) Resistance between GND pole of AC inlet (Point-A) and Equipotential terminal (Point-B). It must be less
than 0.1 ohms.
2) Resistance of GND wire withinAC cable (between Point-C and D). It must be less than 0.1 ohms.
Table-2 Dielectric stren
g
th test condition
Dummy scope for Dielectric strength test
Point-A
Point-C
Point-B
Point-D
Dielectric strength teste
r
Probe-
(
+
)
Probe-
(
-
)
Fi
g
-4 Dielectric stren
g
th test
Fig-5 Protective earthing circuit resistance measurement
Point-B Point-D
Low resistance mete
r
Probe-(-)
Probe-(+)
AC cable
AC inlet
Point-A
Point-C
Dummy scope
•Every wire of the scope
connector is connected to
the one wire (indicated in
green above).
•No PCB, no light
coherent bundle.
•You can make the
dummy scope like above.
•It has yet to be available
as a Special Tool.
EPK-
p
EPK-
p

- 11 -
7.3 Leakage current test
Table-3 shows the limit values of leakage current in the specific test condition.
Check that each measured leakage current value is within the specific value with the following procedures:
1) Set the leakage current meter as shown in Fig-6 (Meter-A: Casing and Protective earthing leakage test
/ Meter-B: Patient applied part leakage test).
Note: 1) Put a capacitor (0.15uF) between the probes of the meter as shown below as a bypass for the leakage
current of a certain frequency which is not harmful for the human body.
2) Equipotential terminal is equal to the chassis ground.
3) ST-5911 is a jig to connect the leakage current meter to the patient circuit ground.
4) We recommend a leakage tester which has a capability of automatically measuring all kinds of leakage
current required for the medical equipment safety.
2) Set the AC power line condition described in Table-3 depending on the test type and connect theAC
cable to the EPK-p.
3) Apply 110% AC voltage, turn on the EPK-p and turn on the lamp and pump in high-mode.
4) Measure the leakage current value indicated on the meter and record it.
5) Turn off the EPK-p and change the polarity of theAC power by reversing the AC plug.
6) Do the item 3) and 4) again. Take the worse value (higher one) as a result of each test.
Leakage Test & its condition Point-A Point-B AC input*4 Standard
1 Casing Leakage N.C. Connected Connected 110% VAC 100µA*1
2 N.C.*2 Connected Open 110% VAC 500µA
3 Protective earthing leakage S.F.C.*3 Open Open 110% VAC 1000µA
4 N.C. Connected Connected 110% VAC 100µA
5 Patient applied part leakage S.F.C. Connected Open 110% VAC 500µA
N.C.: Stands for “Normal Condition”. Status assuming that AC power lines of Live and Neutral and
GND are correctly connected.
S.F.C.: Stands for “Single Fault Condition”. Status assuming that accidentally either one of the AC
power lines or GND is disconnected.
*1. The regulation value is 500µA, however in logical terms the actual value is more or less zero. If
there is some value, you need to check whether the GND line has been connected correctly or not,
or the quality of the GND line.
*2. The condition without GND line is the Normal Condition at the Protective earthing leakage test.
*3. The condition without both the AC line(either one of AC lines) and GND line is the Single Fault
Condition at the Protective earthing leakage test.
*4. Supply 110% voltage of AC. For example, if the normal voltage is 100Vac, the supply voltage will
become 110Vac. 120Vac > 132Vac, 230Vac > 253Vac. If you can supply only 100% voltage instead
of 110%, convert the measured leakage current into the value at with 110% voltage of AC.
Fig-6 Leakage current test
Table-3 Leakage Current Criteria
AC power
Point-A
E
q
ui
p
otential terminal
Leaka
g
e current mete
r
GND
Meter-B
Leakage current test Jig ST-5911
0.15uF
GND
Leaka
g
e current mete
r
GND
Meter-A
0.15uF
Point-B
EPK-
p

- 12 -
8. Trouble shooting
Symptom CHECK ACTION
Fuse (FU1, FU2) Check the fuses in the fuse box located above the AC
inlet. If they have been brown, you need to find a part
that may cause the excessive load by disconnecting
parts one by one.
Power switch (SW1) It seems a rare case but nobody can say it never
happens. Measure theAC voltage at the backward side
of the switch when the switch is turned on. If there is no
AC voltage, the switch is malfunctioning.
Power supply (PS1) -
part for secondary
circuit
If the DC power supply goes down, no LED on the front
panel lights. It seems the situation that the power won’t
turn ON. Because Blower fan (FAN2) and Unit fan
(FAN3) get the DC power from the power supply unit
(PS1), it they stop we should suspect the power supply
is malfunctioning.
Power won’t turn ON
Front panel board
(F700)
If Front panel board is malfunctioning or the cable
between Process board (E700) is disconnected, it
seems the situation that the power won’t turn ON. Check
the connection of the cable and Front panel board by
replacing it with a good one.
Lamp(LP1, LP2) If the message “Please replace the lamp 1 ( or lamp 2)”
appears on the monitor, replace the lamp
Interlock switch (SW2)
Confirm if the lamp house lid is closed completely. If it’s
OK, depress the switch directly. If it’s OK, you may need
to adjust the position of the switch. If it’s still NG, check
the connection between the switch and Process board
(E700). Or the switch itself may be defective.
Lamp wire (B510, 511)
Confirm if B510(White) is connected to Lamp1 and
B511(Black) is connected to Lamp2. If they are
connected the wrong way around, the lamp that is
lighting is not located in the light axis. Thus no light
comes out of the unit. It seems no light.
Power supply (PS1) -
part for Lamp Measure the output voltage at terminal TB1 on the
power supply unit. It must be +12VDC between the
terminal 1 and 3 or 2 and 4.
Lamp does not light
Fan (FAN1, 2, 3) If the fan is defective the lamp won’t start. Check if the
fans are working.
Iris unit (MT1) In the case the iris does not work in both auto and
manual mode, confirm the connection of the wire of the
iris to CN7 on Process board (E700), or the iris motor
itself may be defective.
Iris does not work
Process Board (E700) If the iris doesn’t work only in auto mode, check if the
scope wire for the image signal is firmly connected to
CN2 on Process board. If it’s OK, Process board may be
malfunctioning.
Scope Check the image with another scope
No image is displayed Process board (E700) If the characters are displayed, check if the scope wire
for the image signal is firmly connected to CN2 on
Process board. In the case the characters are not
indicated either, Process board may be defective.
Lamp won’t be
switched
Motor(MOT1)
Lamp selector (SW3)
Sensor board (O700)
Process board (E700)
Check if the connections related to the parts listed in the
left column are OK referring to Wiring diagram. Check if
Lamps have been correctly held in the holder. If not the
rotation disk may be stuck.

13
9. Wiring Diagram
B510 (White)
B511 (Black)
B513
B514
B501
B702-B
r
B701-Blu
B703-Y/G
B704-Blu
B704-B
r
B705-B
r
B705-Blu
B
r
own Blue
B502
B503
B516
B508
B505
B507
B512
B506
B515
B504
Lamp 1
Rear fan
Unit fan
Blower fan
Interlock switch
Photo sensor for Scope
Iris moto
r
Scope
connector
Front panel board
(F700)
Process board
(E700)
Noise filte
r
Power switch
Integrated power supply unit PS1
Pump
f
or Lamp
Sensor
board
(O700)
Moto
r
MOT1 Lamp
selector
SW3
CN9
CN3
CN1
Cable ID not
available
CN5
CN5
CN7
CN8
CN11 CN12 CN13 CN14 CN33
CN10
CN15
CN29
CN4
CN1
CN2
Secondary circuit
Patient
circuit
CN1
CN4 CN3
L2-
L1-
L2+
L1+
TB1
CN2
Lamp 2
f
or Patient circui
t
f
or Secondary circui
t
Cable ID not available
FU1
FU2
Fuse FU1, 2
120V model FSL250V3.15A
230V model FSL250V1.6A