MAINTENANCE
REPLACING THE CIRCUIT CARDS
Qisussembly
CMUHON
Magnavox receiver components on the circuit cards are electrostatic discharge (ESD) sensitive.
Take care to dissipate static charges both on the equipment and on your own person. Static
charges can easily destroy the DGPS receiver circuits. lf you’re unaware of ESD safeguards,
please have an authorized service center handle repairs.
For the following procedure, refer to Table 4 and Figure 11. The numbers in parentheses
refer to the part index numbers in Figure 11.
1. Remove the quick-disconnect power cable (8) from the power socket.
2. Disconnect (unthread) the antenna cable from the antenna connector (5).
3. Disconnect the MULTI-PORT Interface cable. Unscrew the `two slotted screws
securing the connector.
4. Remove the four Phillips screws (1) that secure the case to the mounting base. The
screws sit in recesses in the mounting platforms at the sides of the unit.
5. Separate the two halves of the outer casing (2). Be careful. 'I'he unit falls apart as
you separate the two halves of the case. Set the cases, the front EMI shield (10), and
the front panel (16) to the side.
6. Turn the receiver assembly upside down. The three LED’s (15) should then be
closest to the top of the front panel.
7. Remove the two 3/16-inch hex standoff nuts (7) on the sides of the MULTI-PORT
Interface connector (11).
8. Remove the Antenna connector (5) nut and lock washer that secure the RF/power
supply card (4) to the rear panel.
9. Remove the Phillips screw next to the power socket.
10. Set the real panel (9) and the rear EMI shield (10) aside.
Removing the Circuit Cards
1. Remove the 1/4-inch Phillips screw (3) at the center of the processor card (14).
2. Grasp the processor card (14) at the sides with one hand and lift it gently, separating
the header connector (17). Don’t lift it from the front because you might damage
the LED’s.
21
