5
4
MAINTENANCE
4.1 Cleaning
a. Do not attempt to disassemble your BSG-50 to clean it.
b. Clean your BSG-50 using only a damp cloth.
c. NEVER use water or solvents such as alcohol, window cleaner, etc., to clean your BSG-50.
4.2 Service
If you suspect your BSG-50 is not operating properly, check the following:
a. Check all coaxial cables for opens or shorts.
b. If using an AC power adapter different from the one supplied with the BSG-50, make sure it supplies the BSG-50 with
at least 9 volts (maximum of 13.5 volts) when the BSG-50 is switched on.
You may return your BSG-50 to HORITA for service. Please contact HORITA first, either by phone or mail, before
returning your unit.
4.3 Adjustments
NOTE:
The unit should be powered up for 1/2 hour before any adjustments are performed.
Access to adjustments is made by removing the bottom cover from the BSG-50 as previously described for changing output
signal selection. All adjustments are located on the circuit board as shown in Figure 4-1.
SCH1
SYNC
+
SETUP
BURST
+
+
+
FREQ
1KHZ
+
+
Figure 4-1, Adjustment Locations
4.4 Subcarrier Frequency
Frequency Counter Method
Set up the BSG-50 to output subcarrier on JP6 and to one of the BNC connectors and connect a frequency counter to
observe the output. Adjust FREQ ADJ for a frequency reading of 3,579,545 +/- 5HZ. If not using subcarrier out, return
the jumper on JP2 to pins 1 and 2 before proceeding.
Off the Air Method
The frequency of the BSG-50 master oscillator can be set very accurately by using off the air television broadcast signals.
1. Connect the BSG-50 Video Out through a BNC "T" connector to the input of a video monitor.
2. Connect the video output from a TV receiver/monitor or VCR tuner to the other input of the "T" so that the two video
signals mix and are simultaneously displayed on the monitor. Alternately a monitor with separate A and B video inputs