TABLE OF CONTENTS
Ohaus Corporation www.ohaus.com
iii
MB23 and MB25 Service Manual
3-19
Screws and Washers that Secure the Reflector ...................................................3-9
3-20
MB23: Screws and washers anchoring cables on each side of Heater ................3-9
3-21
Spring Tab on Connector .....................................................................................3-9
3-22
Lifting Out the Heater (MB23) ..............................................................................3-9
3-23
Screw and washer anchoring Heater Cables ..................................................... 3-10
3-24
Lifting Out the Heater (MB25) ............................................................................ 3-10
3-25
MB23: Installing the Heater ................................................................................ 3-11
3-26
Reset Button on the Thermal Overload Device .................................................. 3-11
3-27
MB25 Thermal Overload Device ........................................................................ 3-12
3-28
MB23 Thermal Overload Device ........................................................................ 3-12
3-29
MB 25 Thermal Overload Device Installed ......................................................... 3-12
3-30
Screws in Fan Plate ........................................................................................... 3-13
3-31
Grommets Slide Out from the Bottom Plate ....................................................... 3-13
3-32
Lid Position Rod and Spring under the Fan Plate .............................................. 3-13
3-33
Removing the Fan ............................................................................................. 3-12
3-34
Removing Screw to Access Temperature Sensor Cable .................................... 3-14
3-35
Removing Clip that Secures Heater, with Needle Nose Pliers ........................... 3-14
3-36
Removing Screws and Washers Securing Temperature Sensor ........................ 3-14
3-37
Connecting Cables to the Power PCB ............................................................... 3-15
3-38
Placing Plug on Top Housing ............................................................................. 3-15
3-39
Installing Protective Glass .................................................................................. 3-15
3-40
Clear plastic In-use Cover .................................................................................. 3-16
3-41
Housing Chamber .............................................................................................. 3-16
3-42
MB25 with top open ........................................................................................... 3-16
4-1
Segment Display .................................................................................................4-1
5-1
MB23 & MB25: Housing & Internal Parts .............................................................5-2
A-1
Temperature Calibration Kit installed .................................................................. A-1
