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This PRISM 2 Service Procedure conveys a list of components and service procedures that reect the
PRISM 2 as it was congured at the me of this wring (9/12/12).
USER SERVICE GUIDE
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CONTENTS
INTRODUCTION (USER LEVEL)
1. TITLE PAGE, CONTENTS, & INTRODUCTION
DEFINITIONS ................................................................................................................................................................................6
MODIFICATION WARNING ..........................................................................................................................................................7
2. GENERAL PROCEDURES
RECOMMENDED CHEMICALS & LUBRICANTS .......................................................................................................................8
OXYGEN USE ...............................................................................................................................................................................8
SAFETY ........................................................................................................................................................................................9
SERVICE SCHEDULE & ASSEMBLIES
1. SERVICE & PARTS REPLACEMENT SCHEDULE
SCHEDULE .................................................................................................................................................................................13
2. PRISM 2 ASSEMBLIES DIAGRAM
DIAGRAM ...................................................................................................................................................................................15
AMBIENT PRESSURE
1. BREATHING LOOP
TOOLS ........................................................................................................................................................................................ 17
TROUBLE SHOOTING ...............................................................................................................................................................18
INITIAL INSPECTION .................................................................................................................................................................18
POSITIVE PRESSURE TEST .....................................................................................................................................................19
DISASSEMBLY PROCEDURE ...................................................................................................................................................20
REASSEMBLY PROCEDURE ....................................................................................................................................................23
POSITIVE PRESSURE TEST (REPEATED) .............................................................................................................................. 26
NEGATIVE PRESSURE TEST ...................................................................................................................................................27
DISASSEMBLE & DISINFECT PARTS ...................................................................................................................................... 28
EXPLODED VIEW DIAGRAMS & PARTS LISTS ...................................................................................................................... 30
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2. DSV (DIVE SURFACE VALVE)
TOOLS ........................................................................................................................................................................................ 35
TROUBLE SHOOTING ...............................................................................................................................................................36
MUSHROOM VALVE CHECKS ..................................................................................................................................................36
DISASSEMBLY PROCEDURE ...................................................................................................................................................37
REASSEMBLY PROCEDURE ....................................................................................................................................................38
EXPLODED VIEW DIAGRAMS & PARTS LISTS ...................................................................................................................... 41
3. SCRUBBER BUCKET & SCRUBBER BASKET
TOOLS ........................................................................................................................................................................................ 44
TROUBLE SHOOTING ...............................................................................................................................................................45
DISASSEMBLY PROCEDURE ...................................................................................................................................................45
REASSEMBLY PROCEDURE ....................................................................................................................................................49
EXPLODED VIEW DIAGRAMS & PARTS LISTS ...................................................................................................................... 52
BATTERIES & OXYGEN SENSORS
1. BATTERY COMPARTMENT
TOOLS ........................................................................................................................................................................................ 55
TROUBLE SHOOTING ...............................................................................................................................................................56
DISASSEMBLY PROCEDURE ...................................................................................................................................................56
REASSEMBLY PROCEDURE ....................................................................................................................................................58
EXPLODED VIEW DIAGRAM & PARTS LIST ........................................................................................................................... 59
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2. OXYGEN SENSORS
TOOLS ........................................................................................................................................................................................ 60
TROUBLE SHOOTING ...............................................................................................................................................................61
DISASSEMBLY PROCEDURE ...................................................................................................................................................62
MILLIVOLT/LINEARITY TEST & CLEANING ............................................................................................................................ 63
REASSEMBLY PROCEDURE ....................................................................................................................................................64
RECOMMENDED SENSORS .....................................................................................................................................................65
CALIBRATION ............................................................................................................................................................................65
EXPLODED VIEW DIAGRAM & PARTS LIST ........................................................................................................................... 67
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COPYRIGHT NOTICE
This service manual is copyrighted, all rights are reserved. This material may not be reproduced, displayed,
modied or distributed without the express prior written permission of the copyright holder. It may not be distrib-
uted through the internet or computer without prior written consent.
PRISM 2 Service Guide, Doc. No. 12-4090 through 12-4127
© 2002 Design, 2012
San Leandro, CA USA 94577
INTRODUCTION
This guide provides procedures for proper "User Level Repairs" of the Hollis PRISM 2 Rebreather at the time of
this writing. "User Level Repairs" are repairs that Hollis has deemed suitable for end users to perform themselves
as needed. These guides do not cover all systems that require maintenance.
It is still necessary to have a Hollis PRISM 2 Service Facility complete a "Full Service" annually to main-
tain safe operation of the unit.
This guide does not replace proper instruction from a PRISM 2 Instructor. Instructions contained within this guide
are only to be performed by persons trained to dive and assemble the PRISM 2. Before service, ensure with Hol-
lis that this is the most current revision of this guide. If you do not completely understand the instructions given
in this manual, lack the correct tools, or lack the appropriate level of mechanical knowledge - have an authorized
Hollis PRISM 2 Service Facility or Hollis Customer Service complete repairs. Your Hollis PRISM 2 Dealer or
PRISM 2 Instructor can personally advise you on this matter. You may prefer to have your local PRISM 2 Service
Center perform all repairs. Hollis has provided these guides simply as a convenience for those individuals with
the desire and aptitude to complete basic repairs themselves.
WARNINGS, CAUTIONS, AND NOTES
Pay attention to the following symbols when they appear throughout this document. They denote important infor-
mation and tips.
WARNINGS: are indicators of important information that if ignored may lead to injury or death.
CAUTIONS: indicate information that will help you avoid product damage, faulty assembly, or unsafe condi-
tions.
NOTES: indicate tips and advice.
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DEFINITIONS
Absorbent: chemical media used to remove CO2 from exhaled gas
ADV: automatic diluent valve
Bailout: redundant gas supply system
BOV: bail out valve
Breakthrough: where absorbent scrubber fails, no longer removing CO2 at an adequate rate
Breathing Loop: parts of the rebreather that breathing gas circulates within
Diluent: a gas used for breathing volume and to reduce the fraction of oxygen in the Breathing Loop
DSV: dive surface valve
FO2: fraction of oxygen
HP: high pressure
IP: intermediate pressure
LP: low pressure
Negative Pressure Check: a test placing the Breathing Loop under a vacuum condition to check for leaks
OC: open circuit
OPV: over-pressure valve
PO2: partial pressure of oxygen
Positive Pressure Check: a test that looks for leaks in the Breathing Loop when pressurized
QD: quick disconnect
WOB: work of breathing
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PRISM 2 MODIFICATION
WARNING
- This Service Guide is not an instructional manual for operation of the
PRISM 2. This guide only provides instructions on repairing the unit. No
person should breathe from, or attempt to use in any way, a Hollis Prism
2 rebreather, or any component part thereof, without rst completing an
appropriate Hollis Certied user-training course.
- DO NOT modify or change the Breathing Loop components with any after-
market parts. Doing so could dangerously effect the breathing dynamics
of the system and lead to serious injury or death.
- ONLY USE Hollis brand Oxygen Sensors.
- Ensure any BCD used with the unit provides adequate lift capacity
- If a Hollis alternate inator regulator is removed or not installed, an ad-
equate Bailout Gas Supply System must be used.
- DO NOT replace the rst stage regulators with anything other than Hollis
PRISM Regulators. Doing so could impair the function of the Oxygen
Solenoid.
- Modications could void the warranty. See www.HollisGear.com for exclu-
sions.
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PRISM 2 GENERAL PROCEDURES (USER LEVEL)
RECOMMENDED CHEMICALS & LUBRICANTS
Lubrication: Tribolube 71® or CHRISTO-LUBE® MCG 111
CAUTION: Although equivalent Halocarbon Based Lubricants could be used, they may not provide the
same level of Operational Performance.
NOTE: DOW CORNING® 7 silicone may be substituted for all parts EXCEPT those used on Oxygen
Valves, Regulators, and Oxygen Solenoid Assembly Components.
Sanitizing (internal Breathing Loop parts): Steramine™ solution
Cleaning (Internal plastic parts): Crystal Simple Green® solution or mild dish washing liquid
Cleaning (external plastic parts): Crystal Simple Green® solution or mild dish washing liquid
Cleaning (external metal parts): White Vinegar
Cleaning (electrical contacts): DeoxIT® Gold GN5
CAUTION: The electrical connectors have thin precious metal plating. DO NOT scrape corrosion from
contacts with a hard sharp object. DO NOT use abrasives, petroleum distillates, silicone based cleaners,
erasers, combust able chemicals, or any other harsh cleaners. Hollis recommends the use of DeoxIT
Gold® GN5 for cleaning the electrical contacts.
OXYGEN USE
WARNING:
The Hollis PRISM 2 oxygen critical components are prepared for Oxygen Service when shipped from the
factory. If Hollis PRISM OXYGEN Regulators, Oxygen Valves, or the Solenoid are subsequently used with
equipment, or connected to an Air supply system, that is not rated for Oxygen Service, it cannot sub-
sequently be used with Nitrox breathing gases containing more than 40% oxygen by volume unless it
is again prepared for Oxygen Service by a Qualied Hollis Dealer Facility who is certied in and follows
Oxygen Service Procedures.
This text ONLY covers disassembly, reassembly, and tuning procedures. Oxygen Service Procedures
are beyond the scope of this guide and are not covered within this text. DO NOT attempt to service any
Regulator, Valve, or Solenoid.
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SAFETY
WARNING:
The CO₂ absorbent material used in the Scrubber is caustic alkaline material. Take steps to protect your-
self and your working environment from the effects of airborne dusting of absorbent, eye, and skin con-
tact. Good protection would include gloves, eye protection, and a dust mask. See Material Safety Data
Sheets for the absorbent material for further safety recommendations before working with the Scrubber
Bucket Assembly.
PRIOR TO PERFORMING SERVICE:
EXTERNAL INSPECTION
• Visually inspect the Regulator First Stage Cone Filters for any visible residue present.
• Closely examine all metal parts for any signs of external corrosion.
• If the metal parts have a chrome nish, check closely for any aking or chipping. DO NOT clean any Parts found
to be aking or chipping chrome in an ultrasonic cleaner.
PRIOR TO DISASSEMBLY
• Ensure that you have the latest revision of this Service Guide and all Hollis Service Updates. Contact Hollis
Customer Service to conrm.
• Be certain to perform the Initial Inspection and Troubleshooting Procedures of each section of this Service Pro-
cedure Guide prior to beginning any Section's Disassembly. Doing so will provide clues as to which Internal Parts
may be worn.
• Review the complete Disassembly and Reassembly sections provided in this Service Procedure Guide for the
specic Assemblies being serviced.
• Ensure that you are equipped with all of the Tools and Parts needed. DO NOT attempt to perform the Service if
not equipped with the proper Tools and Parts.
• Perform the outlined steps in the order given, without exception. The Reassembly Procedures have been
outlined with the assumption that you rst followed the Disassembly Procedures as outlined.
• Before reusing or scrapping any parts during service, refer to the Parts Replacement Schedule and Letter Codes
(a, b, c) that follow the Exploded View Diagram Numbers. DO NOT allow old parts to be reused.
• O-rings are classied as being either dynamic or static. Dynamic O-rings are mounted directly on a moving Part,
or they create a Seal against a moving Part. Static O-rings create a Seal between two non-moving Parts. Since
Dynamic O-rings sustain friction and movement, they are to be discarded and replaced during every Service,
regardless of age or appearance. Static O-rings are less subject to wear and after passing close Inspection may
sometimes be reused, although this is not necessarily recommended. Always follow the Service & Parts Replace-
ment Schedule Outlined in the following section.
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• To help avoid any confusion during Disassembly, those parts that are not to be replaced automatically should be
Inspected after Disassembly is completed. They should be laid out in the order they are removed, and compared
with identical new parts to better discern their condition before Reassembly is performed.
• O-rings should be Inspected using a magnier to ensure they are supple, well rounded, and completely free of
any scoring or corrosion that would impair proper sealing. Replace any O-rings in questionable condition.
CLEANING AND LUBRICATION:
TOOLS AND CLEANING SUPPLIES
• Tools to be used must be clean and free of contaminates such as dirt, dust, silicone grease, and oil.
• A supply of warm to hot clean fresh water will be needed for rinsing.
• For blow drying parts and components, a clean (oil free) low pressure air supply is to be used.
DISASSEMBLY
• Again, prior to beginning Disassembly perform the Inspection and Troubleshooting Procedures at the beginning
of each of this Guide's sections.
• Disassemble the different PRISM 2 components in accordance with the disassembly section provided in this
Service Procedure Guide.
CLEANING TIPS
CAUTION: DO NOT use a metal wire brush.
WARNING: If salt or grit is found on any O-rings, discard them and replace with new ones. DO NOT at-
tempt to reuse them.
• Prior to Cleaning, carefully remove any existing thread locking residue from the Threads using a brass or plastic
dental instrument.
• During Cleaning, use special care not to damage Components such as those with delicate Seating Surfaces.
CLEANING - GENERAL
Plastic or Rubber Parts
• Reusable soft and hard Parts, such as regulator Spacers and Protector Caps may be soaked and cleaned in a
solution of warm water mixed with mild dish soap.
• To scrub away deposits, use only a soft nylon toothbrush.
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