Ericsson 19D901841G2, Maintenance Manual

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PARTS LIST
SYMBOL PARTS LIST DESCRIPTION
19B226212G5 Heat Sink. (Mounts on Plate, Qty of 1).
NP280071 Nameplate. (CAUTION).
19B209103P410 Tap screw, hex head: No. 8-32 x 5/8.
(Secures Heat Sink to plate).
19B201074P308 Tap screw, Phillips POZIDRIV: No. 6-32
x 1/2. (Used with A1, Q4, Q5 and
ground strap).
19B209103P306 Tap screw, hex head: No. 6-32 x 3/8.
(Secures frame to plate).
N403P13B6 Lockwasher: No. 6. (Used with ground
strap).
N81P9012 Machine screw, recessed pan: No. 4-40
x 3/4.
N414P11 Lockwasher, internal tooth: No. 4.
(Used with Circulator).
N44P9006B6 Machine screw, fillister head. (Secures
Q2-Q5).
N405P5B6 Lockwasher. (Used with Q2-Q5, R3 and
R33).
5492178P2 Washer, spring tension: sim to Wallace
Barnes 375-20. (Used with Q1).
19A148323P1 Heat Sink. (Used with Q1).
N210P15B6 Nut, hex: No. 8-32. (Used with Q1).
N402P8B6 Flatwasher, steel: No. 8. (Used with Q1).
19C851552P1 Guide. (Used around potentiometers on
A2).
19B201074P320 Tap screw, Phillips POZIDRIV: No. 6-32
x 1-1/4. (Secures A2 Q6 Heat Sink).
19A705329P1 Temperature indicator: sim to Tempil
Division of Big Three Industries Cat. No.
BU-175/79. (Attached to A1 Q4).
19A116552P3 Cable clip: sim to Richco KKC-4.
(Supports W3).
19A705097G1 Support. (Used with input connector J1).
N80P13004B6 Screw, machine: Pan head; No. 6-32 x
1/4". (Secures support).
19D438235G7 Fan Assembly, 24 Vdc.
19A701863P13 Cable clip. (Secures fan assembly
wiring).
7141225P2 Nut, Hex: 4-40. (Secures cable clip).
N80P13006B6 Machine screw: Pan head, Phillips; No.
8-32 x 3/8"
N404P13B6 Lockwasher, internal tooth: No. 6.
N402P7B6 Flatwasher, narrow: No. 6.
7141225P3 Hex Nut: No. 6-32.
N80P9005B6 Machine screw, pan head, steel, No. 4-
40UNC x 5/16".
N402P5B6 Washer: narrow, steel.
N404P11B6 Loackwasher, internal tooth, No. 4.
PRODUCTION CHANGES
Changes in the equipment to improve performance or to simplify
circuits are identified by a "Revision Letter" which is stamped after
the model number of the unit. The revision stamped on the unit
includes all previous revisions. Refer to the Parts List for the descrip-
tions of parts affected by these revisions.
REV. A - POWER AMPLIFIER 19D901807G3
To allow maximum power transfer from the exciter, changed C2 and L4,
deleted R6 and added R7.
C2 was 19A705108P15 Mica: 12pF
±
5%, 500 VDCW.
L4 was 19A701006P6 Strap.
R6 was H212CRP310C Deposited carbon: 10K
±
5%, 1/4 w.
REV. B - POWER AMPLIFIER 19D901807G3
To improve power cutoff when no RF is present at the input. Changed R5
and added R6.
R5 was H212CRP318C Deposited carbon: 18K
±
5%, 1/4 w.
REV. C - POWER AMPLIFIER 19D901807G3
To improve stability, added R8.
REV. A - POWER CONTROL BOARD 19D901803G3
To allow alarming of a low or missing drive level to the Power Amplifier,
changed R15, R16, R35 and Q8. Changed R34 and relocated as shown
below. Also changed R1, R4, R7 and R10 from a 1 turn potentiometer to
a 4 turn potentiometer.
R1 is 19A134248P4 - Variable, cermet, 4 turns: 25K ohms
±
10%, 1/2 w;
sim to Bourns 3339P-1-253.
R4 is 19A134248P4 - Variable, cermet, 4 turns: 25K ohms
±
10%, 1/2 w;
sim to Bourns 3339-1-253.
R7 is 19A134248P4 - Variable, cermet, 4 turns: 25K ohms
±
10%, 1/2 w;
sim to Bourns 3339P-253.
R10 is 19A134248P4 - Variable, cermet, 4 turns: 25K ohms
±
10%, 1/2
w; sim to Bourns 3339P-1-253.
R15 is H212CRP415C - Deposited carbon: .15M ohms
±
5%, 1/4 w.
R16 is H212CRP368C - Deposited carbon: 68K ohms
±
5%, 1/4 w.
R34 is H212CRP439C - Deposited carbon: .39M ohms
±
5%, 1/4 w.
R35 is H212CRP347C - Deposited carbon: 47K ohms
±
5%, 1/4 w.
Q8 is 19A700023P2 - Silicon, NPN: sim to 2N3904.
LBI-38134 LBI-38134
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