HP 6177B Operating And Service Manual page 3

MANUAL CHANGES
Model 6177B DC Power Supply
Manual lOP Part No. 06177-90002
Make all corrections in the manual according to errata below, then check the following table for your power
wi
supply serial number and enter any listed change(s) in the manual.
SERIAL
MAKE
Prefix
i
Number
CHANGES
9C 0191 - 0275 1
OB
0276 - 0365 1,2
OB 0338, 0339, 1,2,3
0340, 0343,
0346, 0348,
0354, 0356,
0357, 0364
OJ
0366 - 'Jp
1,2,3
ALL
-
Errata
OJ 0426 - 0470
L 2, 3, 4
OJ 0471-0580
1 thru 5
1149A 0581 - up 1 thru 6
CHANGE I:
Table 5-4, Step I should read as follows:
Remove CR25 and CR26 from circuit (open). Open
the base lead of Q19B. Disconnect the wire at
point B (white wire). Refer to Component Location
Diagram, Figure 7-2.
CF.ANGE 2:
The serial number prefix of the instrument has been
changed from "9C" to "DB".
In the Replaceable Parts Table, make the following
changes:
Front Panel Binding Post, White: Delete, HP Part
No. 1510-0067.
Meter Bezel: Change to lOP Part No. 4040-0414.
Connector, Test Point, Pin Jack, White: Add. HP
Part No. 1251-2440.
Connector, Test Point. Pin Plug, VIlhite: Add. HP
Part No. 1251-2441:
In the Replaceable Parts Table and on schematic
diagram, make the following changes:
R5: Change to 5.49k, l/8W, HP Part No. 0698-
3382.
Rl0: Change to 5.1k,
tw,
HP Part No. 0698-3-644.
R9: Change to 270n,
tw,
HP Part No. 0686-2715.
Q3,6: Change to HP Part No. 06177-80001.
R33: Change to 2.4K,
tw,
lOP Part No. 0686-2425.
R51: Change to SIn,
tw,
lOP Part No. 0686-5105.
CR11: Add, HP Part No. 1901-0461.
Disconnect the cathode of VR13 from TP18 and
connect the cathode of CRl1 to cathode of VR13.
Connect anode of CR11 to TP18.
Table 5-4; Step 1 should read as follows:
Remove jumper
Jl,
connected to anode of CR26
(point A). Disconnect wire at point B. Refer to
Component Location Diagram, Figure 7-2.
CHANGE 3:
The serial number prefix of the instrument has been
change from" OB" to "OJ" .
In
the Replaceable Parts Table and on the schematic
diagram, make the following changes:
R70: Change to 270n,
~W,
HP Part No. 0686-2715.
CR25,CR26,CR33: Change to HP Part No. 1901-
0642.
R50: Add, lOOn, l/8W, HP Part No. 0757-0401.
connected between +OUT and the junction of
CR25 anode. CR26 cathode, and Ql9A base.
"In the Replaceable Parts Table, delete Q25 (HP Part
No. 1854-0311) from the Milln P. C, Board. Add new
Q25 (HP Part No. 1854-0250) to the Chassis Electri-
cal. The new electrical connections of the new 025
have not been changed but the transistor is now
mounted on the rear Heat Sink. A boron nitride in-
sulator (HP Part No. 0340-0411) has been installed
under Q25 before mounting it On the Heat Sink.
ERRATA:
On Page 5-14, in Part B of Table 5-10, change
Step (b) to read: ,jOutput current remains low."
On the schematic diagram, make the following
changes:
Change the references next to the integrated cir-
cuits in the guard supply and the main error am-
plifier to read: "Z2 (See Note 11); Zl (See Note
II)!! respectively.
Change the reference next to the jumpers in the
meter circuit to read: "Note 9.
11
Change the positions of the Current Range Switch
(S2) to read (from top): "500mA, 50mA, 5mA."
Change the note in the dotted box representing
the Input Circuit Board in two places on the
schematic to read:
"p/o
Input P.C. Board
(06177-60021)."
Change Note 4 to read: "All components located
on main printed circuit board (06177-60022) un-
less otherwise indicated. "
In the Replaceable Parts Table, make the following
changes:
VR6: Change rating to 16.2V, 400mW.
Shoulder Washer, insulated: Add, qty. 6, HP Part
No. 2190-0490.
Bushing Insulator, collector screws, Q7, Q29,Q30:
Change HP Part No. to 0340-0170.
Indian Bead: Add, HP Part No. 4330-0145. Used
to prevent Ferrite bead Ll from contacting c?se
of transistor Q2.
P.C. Board GUide: Add, lOP Part No. 0403-0150.
Lampholder Base, DSl. DS2: Change to HP Part
No. 5040-0305.