Tektronix 213 DMM Instruction Manual page 47

Reassembly. Reassemble the Attenuator Board in the re-
verse order of Disassembly.
ATTENUATOR BOARD REPLACEMENT. Replace the
Attenuator Board in the reverse order of Removal.
FUNCTION BOARD REMOVAL. Removal of the Function
Board is identical to removal of the Attenuator Board.
Disassembly. No further disassembly is covered here. Dis-
assembly of the pushbutton switches is covered under Parts
Replacement.
Reassembly. Reassemble the Function Board in the reverse
order of Disassembly.
FUNCTION BOARD REPLACEMENT. Replace the Func-
tion Board in the reverse order of Removal.
SECONDARY POWER SUPPLY REMOVAL.
To
remove
the Secondary Power Supply, perform the Removal steps
for the cabinet, batteries, A/D Converter Board, and crt.
Then proceed as follows (see Figure 4-7):
CRT
RETAINER
RING
I
LINE
CONVERTER
CHASSIS
Maintenance-213 Service
1. Disconnect the terminal connector holder between the
Secondary Power Supply Board and the Power Supply
Board.
2. Turn the instrument on its side and remove the two nuts
holding the Line Converter Chassis to the Amplifier Board
(see Figure 4-2).
3. Gently I ift the Line Converter Chassis out of the instru-
ment. Remove the electrical contacts and set them aside
for reinstallation.
Disassembly. At this point, disassembly instructions are
limited to mechanical disassembly. Proceed as follows (see
Figure 4-7):
NOTE
Operator safety is dependent upon the electrical
separation between the power line and instru-
ment common, which is dependent upon the
proper installation of parts and the spacing be-
tween them. Therefore, disassembly of the Se-
condary Power Supply is not recommended
unless a trouble has been definitely isolated to
that particular component.
RECTIFIER NETWORK
(WIRED SUBSTRATE)
LINE
CONVERTER
COVER
I
1481-3
Figure 4-7. Secondary Power Supply disassembly.
@ 4-9