JBL ESC 350 Source (serv.man2) Service Manual ▷ View online
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Dolby Pro-Logic
Ò
Surround Processor/CD Player/Tuner
SOURCE
SERVICE BULLETIN
Service bulletin JBL9704 - July 1997
To: All JBL Service Centers
Models: ESC550 - The Source
Subject: Surround level changes during CD search mode
In the event you receive a ESC550 system (including the Source) with the complaint that the
surround level (rear channel volume) changes during the CD search mode:
Procedure:
1) Lay unit face down. Remove the 5 Phillips screws holding the upper & lower case together;
separate cases.
2) Locate C707 (.022uf 50v cap.) on the main PCB in the bottom case.; replace with 470uf 10v
electrolytic capacitor (JBL# 3479347121). Observe polarity; negative terminal should be closest to
connector CN702. It should be possible to cut the original cap off the board and re-solder the
replacement without removal of the main PCB. See drawing.
connector CN702. It should be possible to cut the original cap off the board and re-solder the
replacement without removal of the main PCB. See drawing.
3) Locate solder pads for connector CN702 on the Control PCB in the upper case, near the
headphone jack. Adjacent to the slot cut in the PCB for the 11 conductor cable, solder a .01uf
ceramic cap (JBL# 3519103935) to pins 8 and 11 on the solder pads. See drawing.
ceramic cap (JBL# 3519103935) to pins 8 and 11 on the solder pads. See drawing.
4) Re-assemble unit; test as follows:
a) Plug in unit, assure all cable and speaker connections are intact. Insert CD of choice.
b) Turn power ON to the Source and the Bass550 subwoofer; (display on the Source
should now be active).
c) Toggle “surround mode” button on front panel or with remote control until “NORMAL”
appears.
e) Adjust volume (on the Source) so display reads “VOLUME 30”.
d) Press PLAY button on the Source or the remote control.
e) Press the SEARCH/TUNE button on the Source or the remote control to search up or
down selected track.
Model
Serial number
Action
Correction
ESC550 (Source)
Under 11500
Jumps randomly to surround
(rear) channel level during CD
search mode
Replace C707 with 470uf 10v cap.
Add .01uf cap. to pins 8 & 11 of
CN702
ESC550 (Source)
11500 and higher
Modified by factory
NONE REQUIRED
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Dolby Pro-Logic
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Surround Processor/CD Player/Tuner
SOURCE
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Dolby Pro-Logic
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Surround Processor/CD Player/Tuner
SOURCE
CONTROLS AND THEIR FUNCTION
1.
Volume - Turning this knob clockwise or pressing “+”
on the remote will increase the volume. Turning the knob
counter clockwise or pressing “-” on the remote will
decrease the volume.
counter clockwise or pressing “-” on the remote will
decrease the volume.
2.
Mute - Pressing this button will mute the volume.
3.
Bass - To raise and lower the bass level press these
“+” and “-” buttons. See number “5. Calibration” for the
same adjustments via the remote.
same adjustments via the remote.
4.
Treble - To raise and lower the treble level press
these “+” and “-” buttons. See number “5. Calibration” for
the same adjustments via the remote.
the same adjustments via the remote.
5.
Calibration - This button operates the calibration of
the “Bass”, “Treble”, Balance and Center Channel
Volume. Press this button until the desired object for
calibration (e.g. Bass) appears in the display. Press the
“+” to increase and the “-” to decrease.
Volume. Press this button until the desired object for
calibration (e.g. Bass) appears in the display. Press the
“+” to increase and the “-” to decrease.
6.
Play/Pause - Pressing this button will cause the CD
to begin playing. Pressing it will a CD is playing will
pause the CD until it is pressed again allowing the CD to
continue playing.
pause the CD until it is pressed again allowing the CD to
continue playing.
7.
Skip - Pressing “Back” or “Forward” will cause the
CD to skip backward or forward to the next track.
8.
Scan - Pressing “Back” or “Forward” will cause the
CD to scan backward or forward with in the existing track
being played. In the tuner mode these buttons tune the
receiver to the next station, backwards or forwards.
being played. In the tuner mode these buttons tune the
receiver to the next station, backwards or forwards.
9.
Stop - Pressing this button will the stop the CD
operation.
10. Open - This button will open the CD holder door.
11. Random - Pressing this button will cause the CD to
be played in random order.
be played in random order.
12. Repeat - Pressing this button will cause the CD to
begin again when finished.
begin again when finished.
13. AM/FM - This button allows the switching between
the AM and FM selection of the tuner. This button also
switches the unit back to the tuner mode when in the CD,
TV or Aux modes.
the AM and FM selection of the tuner. This button also
switches the unit back to the tuner mode when in the CD,
TV or Aux modes.
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Dolby Pro-Logic
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Surround Processor/CD Player/Tuner
SOURCE
CONNECTIONS
14. Power - Press this button to turn on the “Source”.
NOTE: The Source must be connected to the Bass550
subwoofer with its main power switch ON to operate.
NOTE: The Source must be connected to the Bass550
subwoofer with its main power switch ON to operate.
15. CD Operation - Pressing this button will place the
“Source” in CD playing mode.
“Source” in CD playing mode.
16. TV Operation - Pressing this button will place the
“Source” in TV operation mode.
“Source” in TV operation mode.
17. Tape/Aux - Pressing this button will place the
“Source” in Auxiliary mode. This is used when you have
another input source connected such as a tape player.
“Source” in Auxiliary mode. This is used when you have
another input source connected such as a tape player.
18. Surround Mode - Pressing this button will allow you
to pick between 3 different mode settings: Dolby
Pro-Logic , Dolby Pro-Logic Phantom mode and
2-channel (stereo) mode.
to pick between 3 different mode settings: Dolby
Pro-Logic , Dolby Pro-Logic Phantom mode and
2-channel (stereo) mode.
19. Tone - This button is used to test and calibrate the
performance of the system.
performance of the system.
20. Sleep - This Button is used to turn the unit off
automatically after a selected amount of time in 10
minute increments up to 90 minutes.
automatically after a selected amount of time in 10
minute increments up to 90 minutes.
21. Auto Tune - Pressing this button, and then pressing
either of the “Search/Tune” buttons (See #8) backward or
forward will cause the “Source” to tune to the next strong
signal.
either of the “Search/Tune” buttons (See #8) backward or
forward will cause the “Source” to tune to the next strong
signal.
22. Stereo/Mono - Pressing this button will play the
selected station without any stereo separation.
selected station without any stereo separation.
23. Rear Speakers - Pressing this button while listening
in either Surround Modes will turn off the surround
speakers.
in either Surround Modes will turn off the surround
speakers.
24. Tuner Presets - Pressing “Auto” for a full second
will cause the tuner to scan for strong signals and place
up to 32 stations in memory as preset stations. To move
across these preset stations press “Skip” (See #7) either
forward or backward. Pressing “Add” will add to the
preset stations the signal presently tuned. Pressing
“Delete” will delete from the preset stations the signal
presently tuned.
will cause the tuner to scan for strong signals and place
up to 32 stations in memory as preset stations. To move
across these preset stations press “Skip” (See #7) either
forward or backward. Pressing “Add” will add to the
preset stations the signal presently tuned. Pressing
“Delete” will delete from the preset stations the signal
presently tuned.
25. Headphone Jack - Connect a set of headphones
with stereo mini-phono plug here for private listening.
with stereo mini-phono plug here for private listening.
Out
Tape/Aux
Powered Subwoofer
TV
Antenna
Tuner
Frequency
Standard
In
A
B
US
FM
75
75
Ω
AM
Loop
or
R
L
26
27
28
29
30
31
32
26. ESC550 Cable Connector - Plug the ESC550 cable
in here and the other end into the Bass550 subwoofer.
in here and the other end into the Bass550 subwoofer.
27. Tape/Aux In/Out - Connect Tape Player or Auxiliary
equipment here. The Output jacks are a Stereo fixed
level signal.
equipment here. The Output jacks are a Stereo fixed
level signal.
28. (A) TV Connection - Connect the dual RCA stereo
cable from the output of a television set here.
cable from the output of a television set here.
29. (B) TV Connection - Connect the stereo mini-phone
jack from the output of a television set here.
jack from the output of a television set here.
30. Tuning Frequency - This switch determines whether
the tuning standard is set for US or European standard
reception.
the tuning standard is set for US or European standard
reception.
31. FM Antenna - This is the connection for the FM
cable antenna.
cable antenna.
32. AM Antenna - This is the connection for the AM loop
antenna.
antenna.
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