GILLIG LOW FLOOR, Руководство по обслуживанию

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406
Electrical System
INTERIOR LIGHTING
Circuit diagrams for the interior lights and their controlling switches, relays, and circuit breakers, are
shown on the applicable wiring diagrams in the Electrical Schematics Manual .
Fluorescent Lighting System
The interior fluorescent lights are energized when the “Interior Lights” toggle switch is flipped to the ON
position. When these switches are properly set, current flows through a Dinex I/O module to complete
the circuit and illuminate the lamp tubes. Refer to the “Interior Lighting” wiring diagram in the Electri-
cal Schematics Manual for further information on the appropriate circuits and connections.
Individual power supply units (ballasts) are mounted in the fluorescent lamp base plate assembly (Figure
9- 49 ). The ballasts are accessible for replacement after lowering the lamp lens and removing the ballast
mounting plate.
Fluorescent Bulb Replacement
The fluorescent lights in the interior lighting system operate on high
voltage. Take care to avoid sustaining electrical shocks, which may cause
personal injury or damage to the equipment. ALWAYS TURN OFF
THE BATTERY DISCONNECT SWITCH before servicing fluorescent
lighting!
If the lamp is not functioning, it may be related to a bad connection and
not end-of-life failure. See Figure 9-51. The molded plastic comprising
the recessed double contact (RDC) that protects the double pins at the
ends of high output lamp tubes is very brittle. An HO lamp tube with
a cracked RDC should not be used as the lamp will easily turn in the
fixture, causing intermittent or no contact with the lamp pins and socket
receptacles. Install very carefully by following the guidelines provided
in “Extinguishable Ballast Replacement” on the following page.
1. Place the INTERIOR LIGHTS switch in the OFF position.
2. Carefully remove the lens from the panel to replace. Start by prying with the special tool provid
-
ed with your coach, or you can use a screwdriver as shown in Figure 9-50, and work your way
down the lens, being careful not to scratch or crack it.
3. Remove the bulb by pushing it toward the end socket, which compresses to free the opposite end
terminals from the socket. Remove the bulb from the light fixture.
4. The bulb is replaced by reversing the above steps. To replace the lens, hold the lens in place and,
starting from one end, gently pound into place with the heel of your hand as if you were replac-
ing a hubcap.