2.
Disconnect the following connectors from the Alt
Sweep circuit board:
a. P2100, a four-wire connector located at the top of the
circuit board.
Maintenance— 2236 Service
b. P2200, a six-wire connector located on the right side
of the circuit board.
3.
Disconnect P2700, a three-wire connector located on
the Main circuit board located behind the Alt Sweep circuit
board.
4.
Remove the cable strap from the Alt Sweep circuit
board by squeezing the strap together with long-nose pliers
on the back side of the circuit board. Slide the strap through
the hole toward the front of the Alt Sweep circuit board.
5.
Use a vacuum-desoldering tool to unsolder the 27
pins (between the Alt Sweep circuit board and the Main cir
cuit board) from the Main circuit board.
6.
Remove the Alt Sweep circuit board from the instru
ment by unclipping it from the plastic holder attached to the
Power-Supply shield.
To reinstall the Alt Sweep circuit board, perform the fol
lowing steps:
7.
Insert the 27 pins of the Alt Sweep circuit board into
the Main circuit board.
8.
Reinstall the Alt Sweep circuit board into the plastic
holder attached to the Power-Supply shield.
9.
Resolder the 27 pins to the Main circuit board (unsol
dered in step 5).
10.
Reinstall cable strap into the Alt Sweep circuit board
(removed in step 4).
11.
Reconnect the three connectors to the Alt Sweep
and Main circuit boards (disconnected in steps 2 and 3).
12.
Unlock the CTM circuit board and lower it into the
instrument (see “CTM Circuit Board” removal procedure).
Attenuator and CH 1 Logic Switch Circuit Boards
To remove the Attenuator and CH 1 Logic Switch circuit
boards, perform the following steps:
1. Use a 1/16-inch hex wrench to loosen the set screws
on both the CH 1 and CH 2 VOLTS/DIV Variable knobs and
remove the knobs.
2.
Set the CH 1 and CH 2 VOLTS/DIV switches to the
same position. Note switch positions for reinstallation refer
ence; then remove the knobs by pulling them straight out
from the front panel.
3.
Remove two screws securing the Attenuator board to
the subpanel (located underneath the CH 1 and CH 2 input
connectors).
4.
Unsolder the resistors from the CH 1 and CH 2 input
connectors.
5.
Lift up and secure the CTM circuit board (see ‘ CTM
Circuit Board” removal procedure).
6.
Remove one screw and end of the ground strap from
the top of the Front-Panel circuit board (ground strap from
the top shield).
7.
Remove five screws securing the top shield to both
the Attenuator circuit board and the bottom shield. Remove
the top shield, the ground strap from the Front-Panel circuit
board and one end of the ground strap from the rear of the
Attenuator circuit board.
8.
Disconnect the following connectors from the Attenu
ator circuit board, noting their locations for reinstallation
reference:
a. P2800, a four-wire connector located at the rear of
the CH 1 Logic Switch circuit board.
b. P2900, a two-wire connector located on the left side
of the CH 1 VOLTS/DIV switch assembly.
c.
P9091, a three-wire connector located between the
Channel 1 and Channel 2 Variable potentiometers at the
rear of the Attenuator circuit board.
6-30
Summary of Contents for 2236
Page 10: ...2236 Service viii The 2236 Oscilloscope ...
Page 74: ...Theory of Operation 2236 Service 3 30 ...
Page 102: ...Performance Check Procedure 2236 Service 4 21 Figure 4 1 Test setup for DMM common mode check ...
Page 242: ...2236 Service 4204 34 Figure 9 6 CTM basic block diagram ...
Page 243: ...DMM POWER S U P P LIE S 2236 Service F ig u re 9 7 C T M d e ta ile d b lo c k diag ram ...
Page 254: ...S I 0 O I 5 1 S O i 4204 21 C IR C U IT BOARD INTERCONNECTIONS ...
Page 267: ...1 2 3 4 5 6 7 8 9 J T K L M_ _ ___ N___l _ P____l S ...
Page 271: ...1 2 3 4 5 6 7 8 9 lO P2SO O U1 A TRIGGER V T O W2500 5 A 223 R E V A P R W G ...
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Page 285: ...A 6 F IL T E R B O A R D lo c a te d u n d e r H V S h ie ld ...
Page 313: ...2236 Service T O U I 3 0 0 4 8 K T O UI300 II S K 0 2 2 3 6 Z Z O A Z 2 OPTION IA ...
Page 317: ...A 10 C O U N T E R T IM E R M U L T IM E T E R B O A R D A D J U S T M E N T LO C A T IO N S ...
Page 319: ...2236 Service TROUBLESHOOTING GUIDE 4206 99 4204 69A ...
Page 323: ...9 ...
Page 324: ...2 REV APR 1986 ...
Page 325: ...2236 SERVICE ...
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Page 333: ...2236 SERVICE ...
Page 334: ...2 4 2 1 ...
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