Puritan Bennett 7202 User manual

FEE 7202
Display
Service Manual

[IE]EENNE / 202
Display ———
Service Manual
Part Number 22107 B
February 1991

SECTION 1. DESCRIPTION
The 7202 Display supplements the 72009 Series Ventilator's message display window by
providing:
e An enhanced view of ventilator messages.
e Detailed readouts of patient data, ventilator settings, and status.
e Visibility of ventilator condition messages from a range of angles and distances.
The display uses a series of interactive screens to report on ventilator status and respond to
operator actions. The display is installed on a swivel arm assembly that can be adjusted for
maximum visibility. The 7202 Display communicates with the 7200 Series Ventilator via a
cable that connecis to the DISPLAY port on the back panel of the ventilator.
There are two versions of the 7202 Display. The current version was designed for use with the
7200ae or 72002 Ventilator, and includes a rear switch for setting the display to work with either
ventilator. An earlier version has no external switch. (The early version can work with the 7200a
or 7200ae, but you must set an interna! jumper accordingly. Also, to use the 7200ae Graphics
option, you must first install a compatibility kit, P/N 4-017180-00, on the display with no exter-
nal switch.)
Figures 1-1 (for displays with rear switch) and 1-2 (for displays with no external switch) show
the major components of the display. Section 2 tells you how to disassemble and assembie
each of these components.
994072 19/04

Rear housing Sy
assembly
External
display cable
Internal hamess
assembly
Front housing
assembly
Swivel arm
assembly
22107-0018
Figure 1-1. 7202 Display (Rear Switch)
1-2
22107
R
19/01)

M Cable
M assembly
Front housing
assembly
Rear housing '
RSS
Ν
Swivel arm
assembly
22107-001A
Figure 1-2. 7202 Display (No External Switch)
22107
B
(2/91)
13

1.1 Description
The display's thin-profile screen features high brightness, no distortion or flicker, wide view-
ing angles, and low power consumption. The all-dot matrix screen allows high-resolution
graphics and alphanumeric characters.
1.2 Electronic Circuitry
The display’s PGB assembly contains the electronic circuitry. The PCB assembly includes
four PCBs: controller, piggyback, power supply, and electroluminescent. Figures 1-3 (for the
display with the rear switch) and 1-4 (for the display with no external switch) show the intercon-
nection within the PCB assembly, and between the display and the ventilator.
The controller PCB accepts ASCII and hex data from the ventilator and interprets it for display.
The appropriate image is stored in RAM on the controller PCB. The controller PCB also drives
the display module by sending pixel clock, data, and horizontal and vertical synchronization
signals (which determine which pixels are lit) to the electroluminescent PCB.
The electroluminescent PCB includes a circuitboard mounted to electroluminesceni material.
This material is sandwiched between two glass panels. Inside the glass panels are column
and row conductors. Which pixels light up is determined by the column and row signals sent
by the controller PCB. These signals send voltage across the corresponding column and row
conductors inside the glass panels. The electric field that is created between two “intersect-
ing” voltages causes the electrolurninescent material to light up.
The piggyback PCB adds a second serial port to the PCB assembly. The second serial port
allows the display to communicate with the printer.
The power supply PCB converts its 12 V input to the different voltages required by the display
circuitry.
1-4 22107 B (2/91)

一 一 一 VENTILATOR 一 一 十 一 一 一 一 一 一 一 一 一 一 ~ DISPLAY WITH REAR SWITCH -一 一 一 一 一 一 一 一 -一
!
i Internal harness (4-017128-00)
man,
DIGITAL Ja
Memory
PCB
we
ADD|
3
Piggyback
or 7200ae ARXDÍ 5
DCI/Display
7
[ARTS
Controller ACTS! 9
PCB
11
ADSR
Piggyback
+
PRINTER
AGND
Controller
PCBs
ADTRI > (4-018421-00)
DCI
Power
|
Supply JI
Hamess
Ascembl +12V[+
ssembly PeND| 。
> +5V 3
DISPLAY
DENDİ 4
+ Lixo HRXD(— T 3 HRD
2 LHRIS RESET)» | 2 | HBTS
HCTS
HRTS HCTS J7 Controller
3 313 PCB
4 | DGND DENDI , | 4 |DEND) HIXD」 3
5
LPGND
PEND];
|
5
|
PGND!
HRXDÍ
5
— glacıs ACIS|。 | 。LAcTs HRTSÍ 7
g LAIXD AMD ig | οἱ ΑΠΟ HDTR| q
9|
HBXD
HIXD|g
|
9
|
HRXD
HGNDÍ
13
49 |-HEND HENDİ чо | о | НЕМО
11| +5V +5V alm +5V 16
ebeni leur | conf
13È+ HAVE ja Dis + [arar
©
14
LAND AGND
|
44
|
14
|
AGND
ВЕЗЕТ
11
15 | ARXD ARXD | 15 | 15 LARXD
I E1-E8
| Ex I LBD | +
emel (Et)
| display cable mm 2
(4-017129-00) 3
i nepal , | (2)
| sw1-1 [L808 [CBDR
|
sw1-3
|
48D
6
(63)
| sw1-4 上 TBD 180 143
| sw1-5 PHBDR TEDRİ 44 (E7)
|
sw1-6
HBDR
J8
一
一
| SW17 HB 一
| +12V GND
I
Power
Suppiy
1 - PCB
I
Power
Supply
+
E
1 Electroluminescent
PCBs (4-018420-00 A
| ) Electroluminescent PCB
|
E22107-002B
Figure 1-3. 7202 Display (Rear Switch)/7200 Series Ventilator interconnection Diagram
22107 B (2/91) : 15

一 一 一 一 - VENTILATOR 一 一 一 刁 一 一 一 一 一 一 一 一 一 一 一 一 一 ~ DISPLAY 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一
1 Display cable
I (4-025121-00)
DIGITAL Ja
7200a
OUTPUT
、
ATXD : Piggyback +
Memory PCB ARXD 3) Piggyback Controller PCBs
or
7200ae
5
CB
(4-018421-00)
DCMDisplay 7 RIS
Controller ACTS! 9
PCB ; 44 | ADSR
PRINTER AGND|13
ADTR| 44
DCI Power
Supply Ji
Harness +12V
Assembly
ㅣ
PGND
À
2
DISPLAY + 3
HDO DENDİ y
o
LERTS Controller
3
|
Hcrs
J7
PCB
4| DGND HO 3
5 LPEND HRXD| 5
6
LACTS HRTSÍ
7
a ADD HDTR 9
o LHRXD HGND| 43
10 sao
uk
HDTR J6
toy GND | 40
al RESETİ
14 | AGND 11
15 | ABXD
>
| J8 ÇI |
| Te Power Supply +
|
+12V
GND
Electroluminescent
| Power Supply PCBs (4-018420-00)
| PCB —
I レー
I Electroluminescent
1 ーー PcB
I
|
Е22107-0038
Figure 1-4. 7202 Display (No External Switch)/7200 Series Ventilator Interconnection Diagram
1-8
22107B (2/91)

1.3 Specifications
Screen
24 line, 80 characters per line
512 x 256 pixel matrix
Pixel size 0.011 inches square
Pixel luminance 25 ft-Lamberts at square
Display color yellow-orange centered at 585 nm
Operating voltages
5 Y de at 1 A and 12 V dc at 0.85 A
Total power consumption
25W
Display interface
RS-2320C serial interface, asynchronous.
Data format (display with rear switch): 19,200 baud, 1 start bit, 8 data bits, 1 stop bit, no
parity.
Data format (display with no external switch): 9600 baud, 1 start bit, 8 data bits, 1 stop bit,
no parity.
Active display area
19.69 cm {7.68 inches) wide, 9.85 cm (3.84 inches) high
Approximate weight
Display with rear switch: 3.2 kg (7 Ib)
Display with no external switch: 5 kg (11 Ib)
Temperature
Operating: 16 to 41° C (60 to 105° F)
Storage: -34 to 71° C (-30 to 160° F)
Operational testing
A self-test mode (switch-selectable in the rear switch version, and jumper-selectable in
the display with no external switch) displays several patterns in a repeating sequence
(ail inoutis ignored). Section 3 (Testing and Troubleshooting) telis you howto view the
test screens.
99407 R (92/014

SECTION 2. SERVICE
The 7202 Display is a field-serviceable accessory of the 7200 Series Ventilator. This section
tells you howto clean, disassemble, and reassemble the display. Section 4 lists the part num-
bers for the display’s field-repiaceable units.
2.1 Required Tools
You will need these tools to service the display:
Small standard screwdriver
Small phillips screwdriver
Small nose pliers
Snap ring pliers
Hex screwdriver set
Static-dissipative service kit (P/N 4-018149-00) or equivalent (static-dissipative mat,
ground cord, and wrist strap)
Conductive bags
Digital multimeter accurate to three decimal places :
2.2 Cleaning
Use a damp cloth and mild detergentto clean the display. Take care not to scratch the image
area. Dry thoroughiy.
CAUTION
To avoid damage to the display, do not autoclave, use a liquid bactericide,
scrub with abrasive cleaners, or allow liquid to penetrate the display or
ventilator.
2.3 Pre-Service Procedures
CAUTION
Never connect or disconnect the 7202 Display from the ventilator while the
ventilator is operating. If the ventilator is not turned off, a momentary loss of”
power to the pneumatic assembly could result, and could start back up ventila-
tion (BUV) mode or damage the display.
1. Run Total EST on the 7200 Series Ventilator. Performing TEST is recommended so if TEST
fails after the display is reinstalled, ihe source of the problem can be easily identified and
corrected.
2. urn off the ventilator. Detach the display cabie from the DISPLAY port on the back of the
ventilator.
221078 (2/91) 24

3. Unscrew the display knob and remove the display from the ventilator. Place the display
face down on a flat surface for disassembly/assembly. Take care not to scratch the image
area.
CAUTION
To protect-electrostatic-sensitive equipment, service personnel must use a
static-dissipative service kit and must follow all electrostatic discharge (ESD)
procedures and precautions before servicing the display.
2.4 Rear Housing
This section tells you how to remove and replace the rear housing.
2.4.1 Removing the Housing
CAUTION
To prevent unnecessary PCB repair, do not pull on the display cable with ex-
cessive force. Do not pry the rear housing open with a screwdriver or any other
instrument.
For displays with rear switch:
1. Remove the external display cable from the rear of the display.
2. Remove the four screws and washers from the rear housing (see Figure 2-1).
3. Separate the front housing from the rear housing by pulling on the front handle. If the front
and rear housings don’t come apart readily, try pulling gently on the comers of the housing
first. 」
4. Remove the internal harness assembly from the rear housing (see Figure 2-2). Remove
the rear housing and set aside,
22107-0048
Figure 2-1. Removing/Replacing the Rear Housing (Displays with Rear Switch)
2-2 22107 B (2/91)

Switch closest to
bottom of display
NOTE
When installed, tab on black connector
to E1-E8 must face away from piggy-
back PCB.
To J4 on
piggyback PCB
To J6 on
controller PCB
To stake connectors E1-E8
on controller PCB
(next to piggybac PCB)
controller. PCB
22107-005B
Figure 2-2. Removing/Replacing the Internal Harness from the Rear Housing
(Displays with Rear Switch)
For displays with no external switch:
1. Remove the seven screws from ihe rear housing (see Figure 2-3).
2. Separate the rear housing from the front housing by pulling up gently on the dispiay cable.
Remove the rear housing and set aside.
094070 19/041 na

Groove
Ground wire
22107-00394
Figure 2-3. Removing/Replacing the Rear Housing (No External Switch)
2.4.2 Replacing the Rear Housing
For displays with rear switch:
1. Once the internal harness assembly is attached to the PCB connectors, reconnect the
other end of the harness to the rear housing (see Figure 2-2).
2. Setthe front housing flat on a surface that won't scratch the window (this is easiest to do
with the handle hanging off the edge of the surface).
3. Make sure that the gasket is firmly seated in the recess around the edge of the rear hous-
ing. To attach the front and rear housings, it is easiest to “fold” the internal harness be-
tween the two fuses, then press the housings together (make sure that the harness is not
“pinched” by the housings). ・
4. Use a thin screwdriver to align the screw holes in the new rear housing, the brackets, and
the front housing. Reinstall the four screws and washers into the rear housing.
For displays with no external switch:
1. Once the display cable is attached to the PCB connectors, position the ground wire
{the bare silver filaments on the display cable) against the groove in the handle (see
Figure 2-3).
2. Reinstall the rear housing, pressing it down until it seats firmly in the front housing.
3. Replace the seven screws in the rear housing and tighten until snug.
DA
99407 R_ 19/04)

2.5 Printed Circuit Board (PCB) Assembly
This section tells you how to disassemble and reassemble the PCB assembly. The PCB as-
sembly includes two ribbon cables and four PCBs (controller, piggyback, power supply, and
electroluminescent).
2.5.1 Disassembly
WARNING
To prevent electrical shock or damage to the display PCB assembly, disconnect the
display from the ventilator (when the ventilator is turned off) and allow the unitto sit for
two minutes to allow the capacitors to discharge before servicing the PCB assembly.
CAUTION
Follow these precautions when handling PCBs: Do not touch PCB connector
ends. Acids on fingers can cause corrosion and subsequent equipment mal-
function. When removing any of the PCBs, use a properly grounded mat and
wrist strap. Store PCBs in conductive bags to protect them.
1. Remove the rear housing (see Section 2.4.1).
2. Label and disconnect the cable from connectors J1, J4, J6, and J7 on the PCB assembly
(Figure 2-4).
For displays with rear switch: Also label and disconnect cable from the E1-E8 jumper
block.
3. For displays with no external switch: Remove the four screws that hold the PCB assembly
to the front housing.
4. Lift the PCB assembly out of the front housing and place on a static-dissipative mat.
22107-008B
Figure 2-4. PCB Assembly
22107 B (2/91)

Piggyback PCB
Remove the piggyback PCB from the controller PCB by squeezing the tops of the three stand-
offs with pliers and lifting up on the piggyback PCB (see Figure 2-5). Pull the PCB straight up
so that the stake connector pins undemeath the PCB don’t bend. Place the piggyback PCB in
a conductive bag and set aside.
: NOTE
E if you replace the controiler or piggyback PCBs (the two PCBs are a matched
di set), be sure to remove the flat toroids from the underside of the old controller
i PCB, and reinstall the toroids on the new controller PCB. Use adhesive tape
o (P/N 4-004975-00) to attach the toroids to the underside ofthe controller PCB.
Stake
connector
42
A
LU Controller
TT PCB
Piggyback cs
PCB
£
22107-005A
Figure 2-5. Piggyback PCB
2-6 22107 B (2/91)

Power Supply PCB
Refer to Figure 2-6.
1. Remove the interconnect cable.
2. Remove the ribbon cable: Gently lift up on the sides of the ribbon cable latch with your
hand or a standard screwdriver. Pull the ribbon cable straight out.
3. Remove the four screws, four spacers, and four nuts that hold the power supply PCB tothe
controller PCB and set aside. Place the power supply PCB in a conductive bag and set
aside.
NOTE
If youreplace the electroluminescent or power supply PCBs (the two PCBs are a
matched set), be sure to remove the old ribbon cables from the flat toroids at-
tached to the underside of the controller PCB.
(Left)
CR
Power
supply
PCB
D
Controller PCB
Ribbon
cable
latch M
i
(Right)
Ribbon cable
(fingers facing right A
of PCB assembly)
9 5
k る 5 SS
WI 4 p
$
interconnect
‘ cable
22107-0060,
Figure 2-6. Power Supply PCB
29907 0 19/0411

1.
Controller PCB
Remove the ribbon cabie: Gently lift up on ihe sides of the ribbon cable tatch with your
hand or a standard screwdriver. Pull the ribbon cable straight out (see Figure 2-7).
Remove the interconnect cable from the controlier PCB and set aside.
Remove the four screws and spacers that secure the controlier PCB to the electrolumines-
cent PCB.
Lift the controller PCB off the electroluminescent PCB.
NOTE
Hf you replace the controller or piggyback PCBs (the two PCBs are a matched
set), be sure to remove the flat toroids from the underside of the otd controller
PCB, and reinstall the toroids on the new controlier PCB. Use adhesive tape
{P/N 4-004975-00) to attach the toroids to the underside of the controfler PCB.
Place the controller PCB in a conductive bag and set aside.
(Top)
Screw and —+--® `
spacer Controller PCB
Electroluminescent
© display PCB
LY
Ribbon VÉ
cabie
Spacer
-U
- > Screw
$
Interconnect
cable Ribbon
cable latch
(Fingers facing
bottom of PCB
assembly)
(Bottom) Screw and NY
spacer
22107-007A
Figure 2-7. Controller PCB

Electroluminescent PCB
Follow these steps to remove the brackets and two ribbon cables connected to the elecirolu-
minescent PCB. (The brackets are installed only on displays with the rear switch.)
@ - 1. Liftthe cable fatches (see Figure 2-8). You can do this by hand, or you can insert the tip ofa
screwdriver into the slot on the ribbon cable latches, then twist the screwdriver to lift each
of the latches.
2. Pull each of the ribbon cables straight out from its latch.
3. For displays with rear switches: Remove the four screws and lockwashers that hold the
two brackets to either side of the electroluminescent PCB.
NOTE
If youreplace the efectroluminescent or power supply PCBs (the two PCBs area
matched set), be sure to remove the old ribbon cables from the flat toroids at-
tached to the underside of the controller PCB.
When no toroids
are
present:
Electroluminescent
display PCB
For PCB assemblies
with toroids installed:
© “Fingers”
a facing up
“Fingers”
facing up
“Fingers”
facing up
Electroluminescent
display PCB
“Fingers”
facing down
“Fingers”
facing down
22107-007B
Figure 2-8. Electroluminescent PCB with Ribbon Cable Connections
22107 B (2/91) 2.0

2.5.2 Reassembly
Electroluminescent PCB
NOTE
Ribbon cables will make contact in only one direction. When positioning the rib-
bon cables in the connectors on the electroluminescent PCB, ensure that the
commective “fingers” are facing up and are securely positioned in the latches.
(See Figure 2-8.)
Fold the ribbon cables (see Figure 2-8). This allows each end of the ribbon cables toreach
its latch.
With the connective fingers facing up, insert the ends of the ribbon cables into the ribbon
cable latches on the electroluminescent PCB. Press the latches down to snap the cables
into place. Gently tug on the ribbon cables to make sure that they don't pull loose from
their connectors.
For displays with rear switch: Position the two brackets (pem nuts facing down) on either
side of the electroluminescent PCB, between the PCB and the display screen. Make sure
thatthe brackets are positioned directly against the electroluminescent PCB. Use the four
screws and lockwashers to attach the brackets.
Controller PCB
1.
2.
3.
4
Thread the ribbon cables through the toroids on the underside of the controller PCB.
Position the four long spacers on the electrojuminescent PCB (see Figure 2-7).
Place the controlier PCB on the spacers, aligning the holes.
insert the four long screws into the holes.
NOTE
Check for correct alignment between the electroluminescent PCB, spacers,
and controller PCB before tightening the screws.
Tighten the screws until snug.
Insert the ribbon cable into ihe cable connector on the controiler PCB (see Figure 2-7).
Ensure that the ribbon cable fingers face the bottom of the PCB assembly as you insert the
cable into its latch.
NOTE ，
Ribbon cables will make contact in only one direction. When positioning the rib-
bon cable in the connector on the controller PCB, ensure that the connective
fingers are facing the bottom of the PCB assembly and are securely positioned
in the latch.
Seat the ribbon cable securely and press down on the latch to close. Gently tug on the
cable to make sure that it doesn’t pull loose from its connector.
2-10
22107 8 (2/91)

Power Supply PCB
Follow these steps to reinstall the power supply PCB to the controller PCB.
1.
2.
3.
6.
Position the four spacers over the four holes on the controller PCB (see Figure 2-6).
Place the power supply PCB over the spacers.
Check the alignment of the PCB holes and spacers, then place the screws in the power
supply PCB holes, spacers, and controller PCB holes.
From undemeath the controller PCB, install a nut onto the end of each of the four screws.
Youmay find this easiest to do by using pliers to hold the nut, while using a phillips screw-
driver to tighten the screw.
Insertthe ribbon cable into the latch on the power supply PCB (see Figure 2-6). Ensure that
the ribbon cable fingers face your right as you insert the cable into its latch. Press the
ribbon cable latch into place. Gently tug on the ribbon cable to make sure that it does not
pull loose from its connector.
NOTE
Ribbon cables will make contact in only one direction. Ensure that the connec-
tive fingers are facing your right (see Figure 2-6) and securely positioned in the
latches on the electroluminescent PCB.
Reinstall the interconnect cable between the controller PCB and the power supply PCB.
Piggyback PCB
Refer to Figure 2-5. Align the piggyback PCB with the three standoffs. Carefully align the stake
connector pins of the piggyback PCB with the connector sockets on the controller PCB. (Be
Careful not to bend any of the stake connector pins. If any of the pins do bend, carefully bend
them back to their correct positions.) Press down until the board snaps into place.
PCB Assembly
1.
Reconnect the internal harness (for displays with rear switch), or the display cable (for
displays with no external switch). See Figure 2-2.
Replace the PCB assembly in the front housing with cable connectors closest to the top of
the front housing.
For displays with no external switch: Insert the four screws that hold the assembly to the
front housing and tighten until snug.
Replace the rear housing (see Section 2.4.2).
22407 B (2/01
nas