JRC JMR-92 Series Field Service Manual page 854

Adjustment of the performance monitor
Check the condition of the performance monitor and adjust the performance monitor as necessary.
In the case of equiped with Interswitch Unit function (Option)
To check the performance with the performance monitor, set the Interswitch Unit
connection to straight (i.e. No. 1 scanner unit is connected to No. 1 display unit).
1.
Click on the [Menu] button on the left toolbar.
The menu is displayed.
2.
Click on the [Maintenance] - [Diagnosis] - [MON Check] or [MON Check (SSR)] button
on the menu.
3.
Turn the [VRM] dial on the KOPU to the farthest edge of the performance monitor
pattern.
4.
Check the amount of attenuation in the dialog box.
Benchmarks for the amount of attenuation are as follows:
Attention Value of Transmitter:
At normal: -6.9 dB to +2.0 dB
At degrading performances: -15.0 dB to -7.0 dB
Attention Value of Receiving Unit:
At normal: -2.9 dB to +3.5 dB
At degrading performances: -15.0 dB to -3.0 dB
Performance monitor pattern
(If the performance of the receiver
degrades, the pattern range becomes
short )
7-31
Adjust VRM to the farthest
edge of the performance
monitor pattern.
Chapter 7 Troubleshooting