Wide Band Adjustment
1. Make the following changes to the VG91: Mode Switch set to L Ch., Stereo Pilot set for 1 00% NORM.
2. Enter 83 with remote for Wide Band/Spectrum adjustments.
3. Adjust Wide Band for Null on scope at Test Point 53 (B-1) (Pin 33 IC200) using +/- buttons on remote.
Spectrum
1. Make the following change to the VG91: Audio Frequency set to 3kHz.
2. Adjust Spectrum for Null on scope at Test Point 53 (B-1) (Pin 33 IC200) using menu Up/Down buttons on
remote.
3. Repeat Wide Band & Spectrum Adjustments again.
Note: DO NOT enter 82. This is a factory stereo alignment, if register 82 is adjusted a full stereo alignment is
required.
Test Mode Entry
1. The service mode in the chassis will reflect the customer settings for such items as: Stereo (On/Off), Cable
(Yes/No), and other similar functions. To achieve the functions desired/not desired, make the selections before
entering the service mode. For example, when performing a Stereo alignment, turn the Stereo ON bdfore
entering the service mode to perform alignment. Press the following transmitter keys without allowing the on-
screen display to time out between entries.
NOTE:
The transmitter supplied with the set may not perform this task properly, if the word "MENU" appears on
screen at the end of following sequence, a UR14,T251 or other similar transmitter with channel and volume
separate from the menu keys on it must be acquired.
0-6-2-5-9-6-MENU
2. The following is an example of what will be displayed on the screen and an explanation of the characters.
GR513
613165-1 E
03
FEATURE
05
Top Line
GR5B = the Chassis Family
613165-1 = Software Version installed
E = Error codes will be displayed here if a communication error exists (EX.A = tuner error).
Error Codes:
A = Tuner
B = Memory
C = Remote Locator
D = Automatic Volume Limiter (Smart SoundD)*
E = PIP
* = "D" indicates AVL in the signal processor of Mono Chassis only. In Stereo Chassis, a "D" does not
indicate failure as AVL is in the Stereo IC.
Bottom Line
03 = Current channel
Summary of Contents for 7538
Page 48: ...All Models 7538 INTERCONNECT WIIRING DIAGRAM ...
Page 49: ...All Models 7538 MAIN CHASSIS SECTION 1 ...
Page 50: ...All Models 7538 MAIN CHASSIS SECTION 2 ...
Page 51: ...All Models 7538 MAIN CHASSIS SECTION 3 ...
Page 52: ...All Models 7538 MAIN CHASSIS SECTION 4 ...
Page 53: ...All Models 7538 MAIN CHASSIS SECTION 5 ...
Page 54: ...All Models 7538 MAIN CHASSIS SECTION 6 ...
Page 55: ...All Models 7538 MAIN CHASSIS SECTION 7 ...
Page 56: ...All Models 7538 CRT PANEL APT145 APT 146 ...
Page 57: ...All Models 7538 KEYBOARD ASW116 IR RECVR ALR016 ...
Page 58: ...All Models 7538 PRO VIDEO JACK PANEL AVJ177 ...
Page 59: ...All Models 7538 DIODE MODULATOR PANEL AWR006 007 ...
Page 60: ...All Models 7538 R5 MAIN CHASSIS PCB TOP VIEW ...
Page 61: ...All Models 7538 MAIN CHASSIS PCB BTM VIEW ...
Page 62: ...All Models 7538 CRT PCB APT146 ...
Page 63: ...All Models 7538 CRT PCB APT145 ...
Page 64: ...All Models 7538 PRO VIDEO JACK PANEL PCB AVJ177 ...
Page 65: ...All Models 7538 DIODE MODULATOR PCB AWR006 007 ...