Player Checkout Procedure
Section 4
January 2009
Digital Talking-Book Player
47
Library Guide
4.7
Audio Quality
Preconditions:
None
Methodology:
A cartridge is inserted into the player and the audio is assessed for excessive audio distortion or noise.
1. a)
Insert a DTB cartridge into the player.
b)
Set the tone and speed controls to their normal (mid) setting.
c)
With the player reading the DTB cartridge, press the Volume Up button until the player announces
“Maximum Volume.”
d)
Listen for excessive distortion, noise, or buzz.
?
Does the audio sound good?
Yes:
The main amplifier and speaker system is functioning correctly.
Continue to section 4.8.
No:
There may be a fault with the speaker, amplifier, or upper housing.
Send the player for
servicing.
2. Return the volume setting to a comfortable level.
4.8
Headphone Check
Preconditions:
None
Methodology:
The plug of a set of headphones is inserted into the headphone jack and its audio is monitored for presence
(in both left and right sides) and for quality. The speaker audio is monitored to confirm that the
microprocessor has detected the presence of headphones and has deactivated the speaker circuitry.
This test section is intended to inspect three headphone functions:
•
Insertion of the headphone plug causes the player to turn off the speaker.
•
Both sides of the headphones play with good audio quality.
•
The contacts inside the headphone jack are not worn out.
Note:
You can use a PC speaker system that allows left and right channel selection instead of headphones
for this test.
1. Insert the plug of the headphones into the headphone jack while a DTB cartridge is playing.
?
Does the speaker audio stop?
Yes:
The player has detected the headphone correctly.
Continue to step 2.
No:
There may be a fault with the headphone subsystem.
Send the player for
servicing.
