Replacement Of Tracking Generator; Replacement Of Att Module (Tg Path); Replacement Of Rf-Box - Hameg HM5014-2 Service Manual

pulling it off the mains switch, and the removing it by moving
it backwards and out of the instrument. Loosen the 3 nuts and
washers inside the rear cover fi xing the PS-module, and re-
move the PS module.
5.6.2 Installing of PS-Board
Insert the 3 screws of the PS module into the 3 holes of the
rear chassis when putting it into place, and fi x it with the 3 nuts
and washers removed earlier. Solder the earth connector to
the brass lug next to the mains switch, and check for connec-
tion. Now insert the power switch rod by fi rst inserting the red
part into the front chassis, and then moving it backwards until
it fi ts onto the mains switch. Connect cables WiC2, WiC4 and
RiC10. Place the cover on the PS module using the 4 cross-
head screws and the countersunk screw holding part of the
interface module. Take the HM5014-2 into operation (ref. to
paragraph. 5.18).

5.7 Replacement of Tracking generator

The replacement of the Tracking generator requires the re-
moval of the IF-unit prior to starting work. See paragraph 5.4
for reference.
5.7.1 Removal of the Tracking generator
Loosen the second coaxial cable CiC5 from the rear on the lower
right side of the CPU-board. Then turn the unit so that the TG
is located lower right hand side looking TG Jack to front. Then
loosen the 4 crosshead screws holding the TG module (see Fig.
5-8), turn the HM5014-2 upside down, and pull the TG module
gently backwards until the SMB connection to TG-ATT module
comes loose. (see Fig. 5-9).
M1
M3
Figure 5-8: Location of screws for removal of TG
Now gently lift the TG module up, and loosen the remaining
2 connections, RiC 9 and CiC 3. Lift the TG module out of the
HM5014-2.
M2
M4
5 . M o d u l e R e p l a c e m e n t
connector
move
Figure 5-9: Removal of TG, likewise RF-Box
5.7.2 Installing of the Tracking generator
Put the TG module in the bay, fi x the cables RiC9 and CiC3 to
the TG, insert the TG into its position slipping it on the SMB
jack of the ATT-TG module. Turn the HM5014-2 into its nor-
mal position and insert the 4 countersunk screws to hold the
TG module. With pincers or pliers fi x CiC5 to the SMB jack on
CPU-board. Install the IF unit. Take the HM5014-2 into opera-
tion (ref. to paragraph. 5.18)

5.8 Replacement of ATT module (TG path)

Remove IF unit (see paragraph 5.4) and TG module (see para-
ragph 5.9) as preparation.
5.8.1 Removal of ATT module (TG path)
Turn the HM5014-2 upside down. Remove the SMB connec-
tor of SiC2 from the TG ATT module (next to CRT). Loosen the
2 crosshead screws holding the TG ATT module in place and
gently remove the TG ATT module, disconnect WiC8 from TG
ATT module.
5.8.2 Installing of ATT module (TG path)
Insert the new TG into its space and insert WiC8 connector. Put
the TG ATT module in its place and fi x it with the 2 crosshead
screws. Place the SMB connector of SiC2 on the SMB jack. In-
sert TG module and IF unit (see 5.4 and 5.7). Take the HM5014-2
into operation (ref. to paragraph 5.18)

5.9 Replacement of RF-Box

Remove IF-unit (see Fig. 5.4) as preparation. Turn the HM5014-
2 to its normal position.
5.9.1 Removal of RF-Box
First loosen the 4 crosshead screws (see Fig. 5-10) holding the
RF-box in place and then very gently place the HM5014-2 with
the CRT side down so the 4 coaxial cables to the CPU-board are
visible, using a pair of pliers gently disconnect the fi rst (CiC4)
and second (CiC8) SMB plug (seen from front), and note that the
frontmost one is also the frontmost one of the RF box.
23
Subject to change without notice