A1 I-Negative Regulator Circuit Board; A1 2-Positive Regulator Circuit Board; A23-Trigger Circuit Board - Tektronix 2336YA Instruction Manual

Maintenance-2336 Service
19. Place the instrument right side up and reconnect
the following cables and connectors (disconnected in
steps 7, 6, 5,4, and 3).
a. P702 (from the EXT Z AX IS connector).
b. P714 (from the transformer).
c. P710 (from the Vert 0utIH.V. Power Supply circuit
board).
d. P830 (for Channel 1) and P831 (for Channel 2) (from
the Trigger circuit board).
e. P730 and P732 (from the Trigger circuit board).
f. P733 (from the Trigger circuit board). Reinstall the
rubber grommet removed in step 4.
g. P703 and P704 (from the CH 1 and CH 2 POSITION
controls respective1 y ).
20. Reinstall both VOLTS/DIV control knobs onto
their shafts in the positions noted in step 2.
21. Reinstall both VOLTSIDIV VAR control knobs in
the positions noted in step 1 and tighten their set screws.
A1 I-Negative Regulator Circuit Board
Removal and replacement of the Negative Regulator
circuit board is accomplished by the following steps:
The following procedure destroys the circuit board
being removed. Perform this procedure only if a
new board is available for replacement.
1. Cut five pins
a t
J803 and six pins
a t
J804 on the Vert
Preamp1L.V. Power Supply circuit board and remove the
Negative Regulator circuit board.
2. Use a vacuum-type desoldering tool to clean the
11 pin holes.
3. Insert the pins of P803 and P804 into the appropriate
holes on the Vert Preamp1L.V. Power Supply circuit board.
Hold the Negative Regulator board in place and solder the
I I pins.
A 1 2-Positive Regulator Circuit Board
Removal and replacement of the Positive Regulator
circuit board is accomplished by the following steps:
C A U T I O N
K I
The following procedure destroys the circuit board
being removed. Perform this procedure only i f a
new board is available for replacement.
1. Note board orientation and cut four pins at J801 and
four pins at J802 on the Vert Preamp1L.V. Power Supply
circuit board and remove the Positive Regulator circuit
board.
2. Use a vacuum-type desoldering tool t o clean the 8
pin holes.
3. Orient the replacement Positive Regulator board a s
noted in step 1 and insert the pins of the replacement
Positive Regulator circuit board into the appropriate holes
on the Vert Preamp1L.V. Power Supply circuit board. Hold
the Positive Regulator board in place and solder the 8 pins.
A23-Trigger Circuit Board
Removal and reinstallation of the Trigger circuit board
is accomplished by the following steps:
1. Disconnect the following connectors and cables
from the Trigger circuit board (note colors and locations
for reinstallation reference):
a. P733 (from the LEVEL control).
b. Two miniature coaxial connectors, J830 and J831.
Note their color and position for reinstallation
reference.
c. P732 (from the Vert Preamp1L.V. Power Supply
circuit board).
d. Miniature coaxial connector P829 (from the Sweep/
Horiz Amp/Opt circuit board).
2.
Loosen, but do not completely remove, nine Phillips-
head screws retaining the Vert Preamp1L.V. Power Supply
circuit board.
3. Remove four Phillips-head screws retaining the
Trigger circuit board.