Analog Signal Block - Sony STR-DE845 Training Manual

NOTE: In Figure 5-1, only the left channel signal flow is shown but the same signal flow can be used to trace the
right channel analog signal through the same ICs except pin numbers are different. Also, all resistors shown on
this figure are surface mount components with easy probing points.
Test Disk: YEDS-18
Track 2 (1KHz signal)
Equipment: CD player connected to CD analog input jack.
or DVD player connected to DVD/LD analog input jack
Caution: The 1KHz test signal is good for signal tracing up to IC1301/pin 85. After this point, the signal output
will depend upon the sound field selected. For example, if Normal Surround mode is selected, only audio will be
present on the center channel. This is because the 1kHz signal is equal in both the Left and Right channels. It
is detected as monaural and sent to the center channel. In other sound fields such as Cinema and Hall, the
system sends certain amounts of the 1KHz signal to all speakers. Using the 1KHz signal for testing can help in
understanding how the various sound fields process signals as described in the Sound Field section of this
course. One important point to remember is that no LFE (subwoofer) channel will be present when using the
1KHz signal. Track number 4 (100Hz signal) on the YEDS-18 disk can be used to produce signals on the LFE
channel. To fully test all channels on a sound field, a movie sound track or music should be used.
Troubleshooting all Signal Paths: The above procedure is good for signal tracing up to IC1301/pin 85. The
signal path after IC1301 is broken into three separate lines (IC1301/pin 24 SOA, pin 23 SOB and pin 22 SOC).
All three lines are digital data. To view data activity on all three lines, a DVD disc with Dolby Digital encode
information must be used for the audio source. For the following test procedure, the "Dolby DVD Demo and Test
Disc" are is used.
Test Disc: Dolby Digital Test DVD version 1.5
Test CD Ordering Information:
TEAC AMERICA, INC.
7733 Telegraph Road, Montebello, California 90640
Tel: 1-(323) 727-7643, Fax: 1-(323) 727-7612
Email: Cyamaguchi@teac.com <mailto:Cyamaguchi@teac.com
Cost: $40 plus $5 handling per order
Set-up:
•
Use the digital connection between the DVD and the STR-DE845 (Optical or Coaxial).
•
Set the DVD to output Dolby digital; this is done in the DVD menu (audio section) in the STOP mode.
•
Set the STR-DE845 to the DVD/LD input (digital cable should be connected to the DVD/LD input) and
AFD mode.
Test Track:
•
Set DVD player to "Title Repeat"
•
From Main Title screen, select "5.1 Channel Test Signals"
•
Next select "System Gain"
•
Next select "997Hz –20 dBFS

Analog Signal Block

19
5. Analog Signal Block