Orban OPTIMOD-FM 8700, Operating Manual

Page: 282 / 390

4-6
MAINTENANCE ORBAN MODEL 8700i
18. Reassembling the Color LCD Display and carrier board.
Referring to step 8, follow the instructions in reverse.
Verify that pin one of the ribbon cables (red stripe) is oriented correctly.
Pin 1 is indicated by the number “1” or a square pad.
19. Reinstalling the Rotary Encoder Board.
Referring to steps 6 and 7, follow the instructions in reverse.
Verify that pin one of the ribbon cables (red stripe) is oriented correctly.
Pin 1 is indicated by the number “1” or a square pad.
20. Reinstalling the Headphone Amplifier Board.
Referring to step 5, follow the instructions in reverse.
21. Reinstalling the Front Panel.
Referring to step 4, follow the instructions in reverse.
22. Check your work.
A) Referring to the cable wiring diagram on page 6-37, verify that all cables have
been securely reattached.
B) Verify that all removed hardware has been replaced and is secure.
25 Replace the Top Cover.
Place top on the unit and reattach the seventeen thread-forming screws and five
machine screws.
The 8700i can now be returned to service.
Field Audit of Performance
Required Equipment:

Ultra-low distortion sine-wave oscillator / THD analyzer / audio voltmeter
With verified residual distortion below 0.01%. Sound Technology 1710B;
Audio Precision System One, or similar high-performance system.
The NAB Broadcast and Audio System Test CD is an excellent source of
test signals when used with a high-quality CD player.

Spectrum analyzer with tracking generator
Stanford Research Systems SR760 or equivalent. Alternatively, a sweep
generator with 50-15,000 Hz logarithmic sweep can be used with an oscil-
loscope in X/Y mode, or you can use a computer-controlled test set like
the Audio Precision System One.

Digital voltmeter