- For more information, see this article's corresponding Wikipedia page: Plantronics Colorplus.
Known Issues
Symptom or Problem Encountered
Causes
Solutions
Disassembly Notes
Tools Needed
Disassembly
- Start by unscrewing the 4 standoffs from the two D-Sub connectors at the rear of the card. Then remove the ISA bracket.
- Using your fingers, separate the two boards by pulling them apart near each of the three plastic standoffs to release them.
- Pull the two boards apart, careful not to bend the connector pins.
Original Parts
Upper Board
Capacitor Specifications and Footprint Information
| RefDes
|
Qty
|
Capacitance
|
Voltage
|
Mount
|
Lead Spacing
|
Temp
|
Type
|
Markings
|
| C1-C22, C25, C26
|
24
|
0.1 µF
|
|
Through Hole
|
7mm
|
|
?
|
K104M
|
| C23
|
1
|
|
|
Through Hole
|
2mm
|
|
Tantalum
|
336 + 10K
|
| C24, C27-C33
|
9
|
33nF
|
|
Through Hole
|
2mm
|
|
Ceramic
|
222
|
| C35
|
1
|
33pF
|
|
Through Hole
|
6mm
|
|
Ceramic
|
330K 1KV
|
| C36
|
1
|
10pF
|
|
Through Hole
|
6mm
|
|
Ceramic
|
100K 1KV
|
Lower Board
Capacitor Specifications and Footprint Information
| RefDes
|
Qty
|
Capacitance
|
Voltage
|
Mount
|
Lead Spacing
|
Temp
|
Type
|
Markings
|
| C1-C13, C15, C16, C17
|
16
|
0.1 µF
|
|
Through Hole
|
7mm
|
|
?
|
K104M
|
| C14
|
1
|
33 µF
|
10V
|
Through Hole
|
5mm
|
|
Tantalum
|
33-10
|
| C18
|
1
|
0.01 µF
|
|
Through Hole
|
2mm
|
|
Ceramic
|
103
|
| *U39 between pins 3 and 7
|
1
|
33 pF
|
1000V
|
Through Hole
|
N/A
|
|
Ceramic
|
330K Z5F 1KV Mexico
|
* Not sure if this is from the factory or not
Integrated Circuits
| RefDes
|
Qty
|
Model Number/Part Number
|
Brand (if applicable)
|
Explanation
|
Datasheet
|
| U1-U16
|
16
|
MK4516N-12
|
Mostek
|
2 Kibibyte (2 Kibibyte x 1 Memory Organization) DRAM [5V version of the 4116]
|
MK4516
|
| U17, U20, U22, U23, U24
|
5
|
SN74LS166
|
Texas Instruments
|
8-Bit Shift Register
|
SN74LS166A
|
| U18, U19, U27, U28
|
2
|
74LS273N
|
Signetics/Texas Instruments
|
Octal D-Type Flip Flop with Single Non-Inverting Outputs
|
SN74LS273
|
| U21
|
1
|
SN74S00N
|
Texas Instruments
|
Quadruple 2-Input Positive-NAND Gates
|
SNx400
|
| U25
|
1
|
SN74S08N
|
Texas Instruments
|
Quad 2-Input Positive-AND Gate
|
SN74S08
|
| U26
|
1
|
MK36C36N-4
|
MOSTEK
|
|
|
| U30
|
1
|
MC6845P
|
Motorola
|
CRT Display Controller
|
MC6845
|
| U31, U34, U35, U36, U38, U52
|
6
|
SN74LS374N
|
Signetics
|
Octal D-Type Edge-Triggered Flip-Flop
|
SN74LS374
|
| U32
|
1
|
74LS51N
|
Signetics
|
AND-OR Invert Gates
|
SN74LS51
|
| U33
|
1
|
SN74S04N
|
Texas Instruments
|
Hex Inverter
|
SN74S04N
|
| U37, U39, U41, U51
|
4
|
SN74LS244N
|
Texas Instruments
|
Octal Buffer w/ 3-Stage Output
|
SNx4LS24x
|
| U43
|
1
|
SN7405N
|
Texas Instruments
|
Hex Inverter with Open-Collector Output
|
SN7405
|
| U44
|
1
|
SN74LS155AN
|
Texas Instruments
|
Dual 2-Line to 4-Line Decoder/Demultiplexers
|
SN74LS155A
|
| U45
|
1
|
DM74LS02N
|
National Semiconductor
|
Quad 2-Input Positive-NOR Gate
|
SN74LS02
|
| U46
|
1
|
74LS30N
|
Signetics
|
8-Input Positive-NAND Gate
|
SN74LS30
|
| U47
|
1
|
74LS174PC
|
|
Hex D-Type Flip-Flop w/ Clear
|
SN74LS174
|
| U48
|
1
|
DM74LS86N
|
National Semiconductor
|
Quad 2-Input XOR Gate
|
SN74LS86
|
| U49
|
1
|
SN74LS125AN
|
Texas Instruments
|
Quad Bus Buffer w/ 3-Stage Output
|
SN74LS125A
|
| U50, U54
|
2
|
DM74LS245N
|
National Semiconductor
|
Octal Bus Transceiver w/ 3-Stage Output
|
SNx4LS245
|
| U53
|
1
|
SN74LS240N
|
Texas Instruments
|
Octal Buffer and Line Driver w/ 3-Stage Output
|
SNx4LS24x
|
Replacement Parts
Upper Board
Lower Board
Capacitors
| RefDes
|
Qty
|
Compatible Part Number
|
Order Links
|
| C14
|
1
|
TAP336M010CCS / TAP336K010SCS
|
Digikey Mouser
|
| C18
|
1
|
K103K10X7RF5UH5 / ZU102103M100X05B0P
|
DigiKey Mouser LCSC
|
| *U39 between pins 3 and 7
|
1
|
CC45SL3AD330JYNNA
|
DigiKey Mouser LCSC
|
Integrated Circuits
| RefDes
|
Qty
|
Compatible Part Number
|
Order Links
|
| U17, U20, U21, U22, U23
|
5
|
SN74LS166AN / SN74LS166AN(LX)
|
DigiKey Mouser LCSC
|
| U18, U19, U27, U28
|
4
|
SN74LS273N / SN74LS273N(LX)
|
DigiKey Mouser LCSC
|
| U21
|
|
SN74S00N
|
DigiKey Mouser LCSC
|
| U25
|
1
|
SN74S08N
|
DigiKey Mouser LCSC
|
| U31, U34, U35, U36, U38, U52
|
6
|
SN74LS374N
|
DigiKey Mouser LCSC
|
| U32
|
1
|
SN74LS51N / XD74LS51
|
DigiKey Mouser LCSC
|
| U33
|
1
|
SN74S04N
|
DigiKey Mouser LCSC
|
| U37, U39, U41, U51
|
4
|
SN74LS244N
|
DigiKey Mouser LCSC
|
| U43
|
1
|
SN7405N
|
DigiKey Mouser LCSC
|
| U44
|
1
|
SN74LS155AN
|
DigiKey Mouser LCSC
|
| U45
|
1
|
SN74LS02N / XD74LS02
|
DigiKey Mouser LCSC
|
| U46
|
1
|
SN74LS30N / XD74LS30
|
DigiKey Mouser LCSC
|
| U47
|
1
|
SN74LS174N
|
DigiKey Mouser LCSC
|
| U48
|
1
|
SN74LS86AN / XD74LS86
|
DigiKey Mouser LCSC
|
| U49
|
1
|
SN74LS125AN
|
DigiKey Mouser LCSC
|
| U50, U54
|
2
|
SN74LS245N
|
DigiKey Mouser LCSC
|
| U53
|
1
|
SN74LS240N
|
DigiKey Mouser LCSC
|
Additional Images
-
Capacitors C35 and C36 on the upper board.
-
Capacitor between pins 3 and 7 on U39.
-
Backside of capacitor at U39.
-
Capacitors marked "K10M"
-
Top board.
-
Backside of top board.
-
Bottom PCB with CGA connector
-
Rear view of bottom board.
Related Links
References
Capacitors C35 and C36 on the upper board.
Capacitor between pins 3 and 7 on U39.
Backside of capacitor at U39.
Capacitors marked "K10M"
Top board.
Backside of top board.
Bottom PCB with CGA connector
Rear view of bottom board.
