OPTIONAL MODIFICATION WORK ORDER FOR 65IS-1/1A GENERAL PURPOSE HF RECEIVERS (KEEP-ALIVE)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00833A000100030005-7
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 13
• Document Creation Date: December 9, 2016
• Document Release Date: March 27, 2001
• Sequence Number: 5
• Publication Date: November 1, 1974
• Content Type: REQ

Approved For Release 2001107/16 : CIA-RDP80-00833A00010003007
MWO 189-1
OPTIONAL
MODIFICATION WORK ORDER
FOR
6515-1/1A
GENERAL PURPOSE
HF RECEIVERS
(KEEP-ALIVE)
NOVEMBER 1974
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TABLE OF CONTENTS
SECTION 1. GENERAL ------------------------------------ Page 1
1. 1 Equipment Affected -------------------------------- Page 1
1. 2 Class of Modification ------------------------------ Page 1
1.3 References --------------------------------------- Page 1
-1.4 ;Modification Time Required ----------------------- Page 1
SECTION 2.
MATERIAL REQUIRED ------------------------ Page 1
SECTION.3.
REASON FOR MODIFICATION ------------------ Page 1
SECTION 4.
MODIFICATION PROCEDURE ------------------ Page 2
SECTION 5.
REMINDER ----------------------------------- Page 3
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SECTION 1. GENERAL
1. 1 Equipment Affected
This MWO will affect all Collins' 6515-1/1A General Purpose
HF Receivers.
1.2 Class of Modification
This MWO is OPTIONAL.
1.3 References
1. 3. 1 Collins Radio Co. , Instruction Book 651S-1/1A General
Purpose HF Receiver (Part 1 and 2).
1.3.2 No other MWO has been issued.
1. 4 Modification Time Required
This modification can be performed within one hour by any
technician.
SECTION 2. MATERIAL REQUIRED
ITEM
NO.
STOCK NO.
NOMENCLATURE
QTY.
COST
1.
5820-P00-0235
Modification Kit f/u/w
1 eao
MWO 189-1 c/o:
a. LMB Box Chassis
No. 137
b. Plug, Amphenol
Type MS3106B
c. Receptacle,
MS3102A
d. Cord
2.
6140-H04-1068
Battery, Storage;
1 ea.
Gel-Cell 6V, 1 AH.
Globe Union Inc.,
Type GC610-1
3.
6130-H04-1067
Charger, Battery;
1 eao
Globe Union Inc. ,
GRC6060 CDF
4.
7510-H00-8637
MWO Identification Plate
1 ea.
SECTION 3. REASON FOR MODIFICATION
This modification will provide an inexpensive, reliable means to
prevent loss of preselected frequency display in the Collins' 651S-1/1A
HF receiver in the event of momentary or extended disruption of AC
primary power.
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 AM
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SECTION 4. MODIFICATION PROCEDURE
4. 1 Remove the receiver from rack mount cabinet. See Figure 1A.
4. 2 Remove the dust cover from the receiver.
4. 3 Remove the hole plug in the hole designed for the remote control
output plug J-63 on the rear of the receiver. See Figure 2 (Figure
39 - Sheet 1 of 3 - Parts List).
NOTE: Some of the earlier production units were provided with
the remote control output. plug J- 63. If this is the case,
proceed with steps 4. 3. 1 thru 4. 3. 4. If this is not the
case, proceed with step 4. 4.
4. 3. 1 Remove front panel assembly.
4. 3. 2 Remove all wiring that is connected to the output plug
J-63. This wiring should be removed from the unit and
discarded.
4. 3. 3 Remove the remote control output plug J-63 from the rear
of the receiver. See Figure 2. Discard this plug.
4. 3. 4 Proceed to step 4. 5.
4. 4 Remove front panel assembly.
4. 5 Install the pre-wired interface chassis mount socket (Amphenol
3102-A, 14S-6S) in the remote control output hole using the 4-40
nuts and bolts supplied. See Figure 3.
NOTE: For purposes of standardizing, mount the socket with
the key at the top. Solder the Red wire to the back of
the positive terminal of TB106. Solder the black wire
to the negative or ground terminal of TB106. See Fig. 3 & 8.
4.6 Solder the "White" and "Green" (110 "Volt AC) wires to the rear
most terminals of fuses F201 and F202. See Figure 4.
4.7 If the S109 Optical Tuning Switch is in an output state of "HI-LO"
or "LO-HI" when the power failure occurs, with this modification,
it will change the receiver frequency by as much as 400 Hz. If
it is in a "HI-HI" or "LO-LO", no change will occur. To over-
come this problem, the following steps must be performed.
4.7. 1 With front panel assembly removed and laying flat, locate
the terminal post between the mode switch (S101) and band-
width switch (S102) and disconnect the red wire from this
post. See Figure 5.
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4.7.2 Pull the wire back through the harness and reconnect it to
the junction of VR501/R505 and Q501-C of TB 102 (The
Keep-Alive Board). See Figure 6.
This part of the modification procedure will tie the S109 switch to the
Keep-Alive Battery during power outages and no frequency change
should occur. An added current drain on the battery system of
about 60 to 90 mA can be expected with this modification, or a
total drain of about 900 mA. It is important. to note that the S109
switch will be active during power outages and any change in the
dial setting will change the frequency.
4.8 Remove the cover from battery pack and remove packing material.
4. 9 Install the battery charger inside battery pack chassis using the
holes and hardware provided. See Figure 3 for proper location.
4.10 Remove the paper from the tape in the bottom of the battery and
press the battery down firmly inside battery pack chassis. See
Figure 3 for proper location.
4.11 Make proper wiring connections to install battery charger and
battery. See Figure 8 for wiring diagram.
4.12 Replace battery pack cover.
4.13 Re-assemble the front panel assembly and dust cover of the
receiver.
4.14 Re-install the receiver in the rack mount cabinet.
4.15 Remove the paper from the tape on the bottom of the battery pack
chassis and press pack down firmly on rack mount cabinet next
to the receiver as shown in Figure 1B.
4.16 Connect the battery pack plug (P63) to the receiver. See Figure 3.
4.17 Pull the AC cord to check the KA circuit.
NOTE: The battery can be checked periodically at the
TB106 Batt -6V terminal.
SECTION 5. REMINDER
An MWO ][dentification Plate should be mounted on the dust cover
(rear panel) to the right of the muffin fan. The Identification Plate
should be marked as follows:
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5.1 MWO 189-1
5. 2 Date of Modification
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Rack Mount
Cabinet
Figure 1A
Figure lB
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 Plug
(P63)
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Install Amphenol 3102A, 14S-6S
Figure 3 - 651S-1 Receiver With Power Pack
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Battery Plug
F201 F202
Figure 4 - 651S-1 Chassis
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Figure 5 - Rear View of Front Panel Assembly
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C. M
M V M
O^.
U;3 Ji
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~a Ia c~~o w LL. a
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