Olympus BH2 Series Guide

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Scannedforpersonal,non‐businessuseonly
September20,2018

OLYMPUS RESEARCH MICROSCOPES
BH2 SERIES
TROUBLESHOOTING
&
ADJUSTMENT MANUAL
FOR ELECTRICAL BASE
B2-BDT, B2-BDS-2, B2-BDS-3
OLYMPUS

INTRODUCTION
Three types of electrical base, B2-BDT/B2-BDS-2/B2-BDS-3 are available
for the BH2 Series. Refer to the manuals for each model.
• B2-BDT is used commonly for BHT, BHTU and BHTM.
• B2-BDS-2 and B2-BDS-3 are used commonly for BHS, BHSU and BHSP.
The difference between B2-BDS-2 and B2-BDS-3 is described in "Hints for
Using This Manual" in the manual.
GENERAL CONTENTS
• Troubleshooting for B2-BDT .......................... Section A
• Troubleshooting for B2-BDS-2 Section B
• Adjustment for B2-BDS-2 ............................. Section C
• Troubleshooting for B2-BDS-3 .............•.......... Section D
• Adjustment for B2-BDS-3 ............................. Section E

A. TROUBLESHOOTING (B2-BDT)
CONTENTS
1. Hints for Using This Manual .........•................. No. A-1
2. Lamp
2-1
Lamp is not lit
No. A-2
2-2 Light intensity adjustment fails. . ................. . No. A-4
2-3 Lamp flickers. . .................................... No. A-5
2-4 Lamp burns out. . ................................... No. A-6
3. Display
3-1 Abnormal display ................................... No. A-7
4. Power Supply
4-1 Power is not supplied even after the main switch
is turned on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. A-8
5. Circuit Diagram ....................................... No. A-12

A. TROUBLESHOOTING (B2-BDT)
l. Hints for Using This Manual
This manual is written in the flowchart format. Follow the
arrow mark to find out a defective part.
The numbers and symbols like [I] , ~ indicate the numbers
of connector and pin.
"Refer to the waveform of JJ ~ " means "Connect HOT to
pin l and GND to pin 2 when using a multimeter or an
oscilloscope".
* " 0- [I] " means "Connect HOT to pin 2 and GND to pin l".
GND +A reference voltage, OV, in an electronic circuit.
HOT + A line to apply a supply voltage.
The symbols like @ and @ mean "Jump to @ and @ in
the same i tern" .
The symbols @ and @ mean "Proceed the work according to
the check methods @ and QV given in the same item".
No. A-1

A. TROUBLESHOOTING (B2-BDT)
No. A-2
2. Lamp
2-l Lamp is not lit.
UVPC48
Causes
l.
Burnt lamp
2. Defective
transistor QlOl
3.
Defective
UYPC48
4. Defective
lamp socket
5.
Defective
variable resistor RVlOl
6.
Defective power
supply part
0
Is the OV LED lit when
the main switch lS
turned ON?
0
NO
Does the 2V -
7V LEDs change
YES
with the adjustment of the
0
Does
the 2V - 7V LEDs
light intensity control?
change with the adjust- YES
ment of the
light
Replace the
intensity control?
NO
y UYPC48.
'
Proceed the work according to
"No.
A-8 4.
Power Supply".
NO
YES 9 @
Is the variable resistor RVlOl
Remove the lamp socket. normal?
YES
~©
NO
Is the lamp conducting?
Replace the
RVlOl.l
(Resistance
at both
ends
of the lamp
~ om
f YES
~®
Is the
lamp lit?
I
0
®
~

A. TROUBLESHOOTING (B2-BDT)
No. A-3
®
Replace the lamp.
Is the lamp lit ?
YES
NO
+-----!B
Are the lamp socket
terminals conduc ting
wi th the lamp set on
the lamp socket?
YES
NO
Rep lace the lamp socket.
Is the lamp lit?
YES f
~f-C-- N_o __ _
the transistor QlOl
norma l?
YES
NO
Replace the QlOl
Is the lamp lit?
Replace the UYPC48.
@,, __
0 2 4 6 7
ODD DD
LED displa y
Normal if the resistan ce value
between @] (orange) and ~
(blue) varies smoothl y from 0
to 500~ when the light intensit y
control lever is slid with the
Jl02 removed. Abnormal if not.
~ Normal if 0.6V or greater voltage
is generated between the base
(yellow) and the emitter (brown)
o f QlOl when measured with a
multimeter with the light intensit y
control lever set to th e Max.
position. Abnormal if the voltage
is lower than 0.6V .

A. TROUBLESHOOTING (B2-BDT) No. A-4
2-2 Light intensity adjustment fails.
®
I
SUlOl SU102
L_ ______ c_h_a_n_~
TlOl
UVPC4B
Causes
l. Defective variable resistor RVlOl
2. Defective transistor QlOl
3. Defective UYPC48
Is the variable
resistor
RV-101 normal?
YES
NO
Replace
the RVlOl.
Is the lamp light
intensity adjustable?
j_
YES t
I
NO
(END
l
Is the transistor
QlOl
normal?
1
YES
NO
Replace the QlOl.
I
Is the lamp light
intensity adjustable?
YES)
~)
NO
Replace the UYPC48.
®
Normal if the resistance value
between 0J (orange) and ~ (blue)
varies smoothly in 0 to 500~ when
the light intensity control lever
is slid with the Jl02 removed.
Abnormal if not.
@ Normal if 0.6V or greater voltage
is generated between the base
(yellow) and the emitter (brown)
of QlOl when measured with a
multimeter with the light intensity
control lever set to the Max.
position. Abnormal if the voltage
is lower than 0.6V.

A. TROUBLESHOOTING (B2-BDT)
No. A-5
2-3 Lamp flickers.
Causes
l.
Contact failure of the lamp
stained
contact
in
the lamp
2.
Defective variable
resistor
®
3. Defective transistor
4.
Defective UYPC48
Check the lamp socket (mainly
the contact with the lamp).
QlOl
If the contact is stained,
clean it and check if the lamp
is normally lit.
~YES i NO
@ Is the variable resistor I
RVlOl normal? J
6 YES
NO
'
Replace the RVlOl
Is the
lamp normally
lit?
YES
' )
NO
(§)
@
Is
the transistor QlOl
normal?
~
YES
.... ®
NO
®
@
UVPC48
caused by the
socket
RVlOl
Remove the lamp and screw from the
lamp socket, and check the contact
with the lamp for any stain.
(Take care not to fly the spring.)
* Don't touch the lamp by a bare
hand.
* Avoid opening the contact
excessively. The contact will
be broken .
Normal if the resistance value
between @] (orange) and ~ (blue)
varies smoothly in 0 to 500~ when
th e light intensity control lever
is slid with the Jl02 removed.
Abnormal if not.
Normal if 0.6V or greater voltage
is generated between the base(yellow)
and the emitter (brown) of QlOl when
measured with a multimeter with the
light intensity control lever set to
the Max. position. Abnormal if the
voltage is lower than 0.6V.

A. TROUBLESHOOTING (B2-BDT)
Replace the QlOl.
Is the lamp normally lit?
YES •
~~N-0-----1B
Replace the UYPC48.
2-4 Lamp burns out.
S\J 101 S\J 102
F101 ~
channe~
T101
Causes
No. A-6
UVPC4B
l. Defective transistor QlOl
2. Defective UYPC48
@ Is the transistor QlOl
normal?
NO
l YES
0---------,
t
I Replace the QlOl.
I Is the lamp lit? I
YES -t
~NO
I Replace the UYPC48. J
G0 Normal if 0.6V or greater voltage is
generated between the base (yellow)
and the emitter (brown) of QlOl
when measured with a multimeter with
the light intensity control lever
set to the Max. position. Abnormal
if the voltage is lower than 0.6V.