BenQ TH685P User manual

Digital Projector
User Manual
Home Entertainment Series I TH685P V 1.00

2 Warranty and Copyright information
Warranty and Copyright information
Limited warranty
BenQ warrants this product against any defects in material and workmanship, under normal usage and
storage.
Proof of purchase date will be required with any warranty claim. In the event this product is found to be
defective within the warranty period, BenQ's only obligation and your exclusive remedy shall be
replacement of any defective parts (labor included). To obtain warranty service, immediately notify the
dealer from which you purchased the product of any defects.
Important: The above warranty shall be void if the customer fails to operate the product in accordance
with BenQ's written instructions, especially the ambient humidity must be in-between 10% and 90%,
temperature in-between 0°C and 35°C, altitude lower than 4920 feet, and avoiding to operate the
projector in a dusty environment. This warranty gives you specific legal rights, and you may have other
rights which vary from country to country.
For other information, please visit www.BenQ.com.
Copyright
Copyright © 2021 by BenQ Corporation. All rights reserved. No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system or translated into any language or
computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical,
manual or otherwise, without the prior written permission of BenQ Corporation.
Disclaimer
BenQ Corporation makes no representations or warranties, either expressed or implied, with respect
to the contents hereof and specifically disclaims any warranties, merchantability or fitness for any
particular purpose. Further, BenQ Corporation reserves the right to revise this publication and to make
changes from time to time in the contents hereof without obligation to notify any person of such
revision or changes.
*DLP, Digital Micromirror Device and DMD are trademarks of Texas Instruments. Others are
copyrights of their respective companies or organizations.
Patents
Please go to http://patmarking.benq.com/ for the details on BenQ projector patent coverage.

3Table of Contents
Table of Contents
Warranty and Copyright information ................................................................................ 2
Important safety instructions .............................................................................................. 4
Introduction .......................................................................................................................... 7
Shipping contents ....................................................................................................................................... 7
Projector exterior view ............................................................................................................................ 8
Controls and functions.............................................................................................................................. 9
Positioning your projector ................................................................................................. 11
Choosing a location .................................................................................................................................11
Obtaining a preferred projected image size....................................................................................... 12
Mounting the projector ..........................................................................................................................13
Adjusting the projected image ..............................................................................................................14
Connection .......................................................................................................................... 16
Connecting smart devices ......................................................................................................................17
Operation ............................................................................................................................ 18
Starting up the projector ........................................................................................................................18
Using the menus ....................................................................................................................................... 20
Securing the projector ............................................................................................................................21
Switching input signal ...............................................................................................................................23
Shutting down the projector .................................................................................................................23
Direct power off ......................................................................................................................................23
Menu operation ................................................................................................................... 24
Menu System .............................................................................................................................................24
Basic menu ............................................................................................................................................... 28
Advanced menu ..................................................................................................................................... 30
Maintenance ........................................................................................................................ 39
Care of the projector ..............................................................................................................................39
Lamp information ..................................................................................................................................... 40
Troubleshooting ................................................................................................................. 44
Specifications ...................................................................................................................... 45
Projector specifications ..........................................................................................................................45
Dimensions ................................................................................................................................................46
Timing chart............................................................................................................................................... 47
RS232 command....................................................................................................................................... 49

4 Important safety instructions
Important safety instructions
Your projector is designed and tested to meet the latest standards for safety of information technology
equipment. However, to ensure safe use of this product, it is important that you follow the instructions
mentioned in this manual and marked on the product.
1. Please read this manual before you
operate your projector. Save it for future
reference.
2. Do not look straight at the projector
lens during operation. The intense light
beam may damage your eyes.
3. Refer servicing to qualified service
personnel.
4. Always open the lens shutter (if any) or
remove the lens cap (if any) when the
projector lamp is on.
5. The lamp becomes extremely hot during
operation. Allow the projector to cool for
approximately 45 minutes prior to removing
the lamp assembly for replacement.
6. In some countries, the line voltage is NOT
stable. This projector is designed to operate
safely within a mains voltage between 100 to
240 volts AC, but could fail if power cuts or
surges of ±10 volts occur. In areas where
the mains voltage may fluctuate or cut
out, it is recommended that you
connect your projector through a power
stabilizer, surge protector or
uninterruptible power supply (UPS).
7. Do not block the projection lens with any
objects when the projector is under
operation as this could cause the objects to
become heated and deformed or even cause a
fire. To temporarily turn off the lamp, use the
blank function.
8. Do not operate lamps beyond the rated lamp
life. Excessive operation of lamps beyond the
rated life could cause them to break on rare
occasions.

5Important safety instructions
9. Never replace the lamp assembly or any
electronic components unless the projector is
unplugged.
10. Do not place this product on an unstable cart,
stand, or table. The product may fall,
sustaining serious damage.
11. Do not attempt to disassemble this projector.
There are dangerous high voltages inside
which may cause death if you should come
into contact with live parts. The only user
serviceable part is the lamp which has its own
removable cover.
Under no circumstances should you ever
undo or remove any other covers. Refer
servicing only to suitably qualified professional
service personnel.
12. Do not block the ventilation holes.
- Do not place this projector on a blanket, bedding or
any other soft surface.
- Do not cover this projector with a cloth or any other
item.
- Do not place inflammables near the projector.
If the ventilation holes are seriously
obstructed, overheating inside the projector
may result in a fire.
13. Always place the projector on a level,
horizontal surface during operation.
- Do not use if tilted at an angle of more than 10
degrees left to right, nor at angle of more than 15
degrees front to back. Using the projector when it is
not fully horizontal may cause a malfunction of, or
damage to, the lamp.
14. Do not stand the projector on end vertically.
Doing so may cause the projector to fall over,
causing injury or resulting in damage to the
projector.
15. Do not step on the projector or place any
objects upon it. Besides probable physical
damage to the projector, doing so may result
in accidents and possible injury.
16. When the projector is under operation, you
may sense some heated air and odor from its
ventilation grill. It is a normal phenomenon
and not a product defect.

6 Important safety instructions
17. Do not place liquids near or on the projector.
Liquids spilled into the projector may cause it
to fail. If the projector does become wet,
disconnect it from the power supply's power
outlet and call BenQ to have the projector
serviced.
18. This product is capable of displaying inverted
images for ceiling/wall mount installation.
19. This apparatus must be earthed.
20. Do not place this projector in any of the
following environments.
- Space that is poorly ventilated or confined. Allow at
least 50 cm clearance from walls and free flow of air
around the projector.
- Locations where temperatures may become
excessively high, such as the inside of a car with all
windows rolled up.
- Locations where excessive humidity, dust, or cigarette
smoke may contaminate optical components, shorten
the projector's life span and darken the image.
- Locations near fire alarms
- Locations with an ambient temperature above 40°C /
104°F
- Locations where the altitudes are higher than 3000 m
(10000 feet).
Risk Group 2
1. According to the classification of
photobiological safety of lamps and lamp
systems, this product is Risk Group 2, IEC
62471-5:2015.
2. Possibly hazardous optical radiation emitted
from this product.
3. Do not stare at operating lamp. May be
harmful to the eyes.
4. As with any bright source, do not stare into
the direct beam.
Hg - Lamp contains mercury. Manage in accordance with local disposal laws. See www.lamprecycle.org.
To avoid damaging the DLP chips, never aim a high-power laser beam into the projection lens.
3000 m
(10000 feet)
0 m
(0 feet)

7Introduction
Introduction
Shipping contents
Carefully unpack and verify that you have all of the items shown below. If any of these items are missing,
please contact your place of purchase.
Standard accessories
Optional accessories
Replacing the remote control batteries
1. Press and slide off the battery cover, as illustrated.
2. Remove the old batteries (if applicable) and install two
AAA batteries. Make sure that the positive and negative
ends are positioned correctly, as illustrated.
3. Slide the battery cover in until it clicks into place.
Projector Remote control with
batteries Quick start guide
Warranty card* Power cord
• The supplied accessories will be suitable for your region, and may differ from those illustrated.
• *The warranty card is only supplied in some specific regions. Please consult your dealer for detailed information.
1. Spare lamp kit
2. 3D glasses
• Avoid leaving the remote control and batteries in an excessive heat or humid environment like the kitchen,
bathroom, sauna, sunroom or in a closed car.
• Replace only with the same or equivalent type recommended by the battery manufacturer.
• Dispose of the used batteries according to the manufacturer's instructions and local environment regulations for
your region.
• Never throw the batteries into a fire. There may be danger of an explosion.
• If the batteries are dead or if you will not be using the remote control for an extended period of time, remove the
batteries to avoid damage to the remote control from possible battery leakage.

8 Introduction
Projector exterior view
1. Focus ring and Zoom ring
2. Vent (air exhaust)
3. Adjuster feet
4. Projection lens
5. IR remote sensor
6. External control panel
(See Controls and functions on page 9.)
7. Lamp cover
8. Ambient Light Sensor (ALS)
9. Vent (air inlet)
10. Audio input jacks
Audio output jack
11. HDMI 2 input port
12. HDMI 1 input port
13. USB Type A port
14. RS-232 control port
15. AC power jack
16. Kensington anti-theft lock slot
17. Ceiling mount holes
7
6
17
17
17
9
8
3
3
3 3
5
4
1
2
10 11 12 13
15 16
14

9Introduction
Controls and functions
Projector & Remote control
1. POWER
Toggles the projector between standby mode
and on.
ON/ Off
Toggles the projector between standby mode
and on.
2. POWER indicator light/TEMPerature
warning light/LIGHT indicator light
(See Indicators on page 43.)
3. IR remote sensor
4. BACK
Goes back to previous OSD menu, exits and
saves menu settings.
5. Arrow keys ( , , , )
When the On-Screen Display (OSD) menu is
activated, these keys are used as directional
arrows to select the desired menu items and
to make adjustments.
Keystone keys ( , )
Displays the keystone correction page.
Volume keys /
Decreases or increase the projector volume.
2
9
7
6
8
5
1
3
4
10
All the key presses described in this document
are available on the remote control or projector.
1
5
14
11
4
13
8
10
12
16
6
7
17
15

10 Introduction
Remote control effective range
The remote control must be held at an angle within 30 degrees perpendicular to the projector's IR
remote control sensor(s) to function correctly. The distance between the remote control and the
sensor(s) should not exceed 8 meters (~ 26 feet).
Make sure that there are no obstacles between the remote control and the IR sensor(s) on the
projector that might obstruct the infra-red beam.
6. SOURCE
Displays the source selection bar.
7. ECO BLANK
Used to hide the screen picture.
Do not block the projection lens from
projecting as this could cause the blocking
object to become heated and deformed or
even cause a fire.
8. OK
Confirms the selected On-Screen Display
(OSD) menu item.
9. AUTO
Automatically determines the best picture
timings for the displayed image when PC signal
(analog RGB) is selected.
* Available on compatible projectors only.
10. MENU
Turns on the On-Screen Display (OSD) menu.
11.
Displays the keystone menu.
12. PIC MODE
Selects the picture mode.
13.
Toggles projector audio between on and off.
14. MHL Zone
This model does not support MHL functions.
15. SOUND MODE
Selects the sound mode.
16. LUMIEXPERT BOOST
Displays the LumiExpert Boost menu.
17. Volume keys /
Decreases or increases the projector volume.
• Operating the projector from the front • Operating the projector from the top
Approx.+30º
Approx.+30º