Panasonic PT50DL54 - 50" DLP TV Quick start guide

Order NO. PASC/TSD
0501DLPB06
Technical Guide
High Definition DLP ™Projection
Television
GN1D Chassis
PT-50DL54 / PT-60DL54
Technology, Start Up, Protection,
Troubleshooting, & Adjustments
Panasonic Services Company
National Training Center

Produced by
Panasonic Services Company
National Training Department
Panasonic is a registered trademark of Matsushita Electric Industrial Co., Ltd.
High-Definition Multimedia Interface and HDMI are trademarks of HDMI Licensing, LLC
Digital Light Processing™, DLP™ and DLP Cinema™ are trademarks of Texas
Instruments Incorporated, of which DLP™ Products is a wholly owned subsidiary.
BBE, the BBE logo, Sonic Maximizer and High Definition Sound
are registered trademarks or trademarks of BBE Sound, Inc.
Copyright ©2005 by Panasonic Services Company
All rights reserved. Unauthorized copying and distribution is a violation of law.
Warning
This service information is designed for experienced repair technicians only and is not designed for use by the
general public. It does not contain warnings or cautions to advise non-technical individuals of potential
dangers in attempting to service a product. Products powered by electricity should be serviced or repaired
only by experienced professional technicians. Any attempt to service or repair the product or products dealt
with in this service information by anyone else could result in serious injury or death.

Table Of Contents
FEATURES.....................................................................................................................1
FEATURE – 3:2 PULL DOWN PROCESS.............................................................................2
Background..............................................................................................................2
TV feature - 3:2 pull down........................................................................................2
FEATURE – DISPLAY FORMAT = 720P NATIVE RESOLUTION................................................3
FEATURE – HDMI ™......................................................................................................3
ADDITONAL FEATURES....................................................................................................3
DLP ™CONCEPT ..........................................................................................................5
LAMP ............................................................................................................................5
COLOR WHEEL ..............................................................................................................5
DMD ............................................................................................................................6
BOARD P/N, LAYOUT AND INTERCONNECTIONS.....................................................7
BOARD LIST...................................................................................................................7
BOARD INTERCONNECTIONS............................................................................................7
PART NUMBERS FOR COMMON PARTS...............................................................................8
POWER-ON SEQUENCE.............................................................................................11
POWER OFF SEQUENCE ...............................................................................................12
STANDBY & POWER-ON CIRCUIT.............................................................................13
STANDBY CIRCUIT........................................................................................................13
POWER-ON CIRCUIT .....................................................................................................13
TROUBLESHOOTING SCENARIOS....................................................................................14
VOLTAGE DISTRIBUTION ...............................................................................................14
COLOR WHEEL OPERATION.....................................................................................17
CONCEPT ....................................................................................................................17
COLOR WHEEL REPLACEMENT......................................................................................17
COLOR WHEEL CIRCUIT BLOCK DIAGRAM ......................................................................18
COLOR WHEEL MOTOR DRIVE (INPUTS).........................................................................18
Drive Waveforms....................................................................................................19
COLOR WHEEL ASSEMBLY OUTPUTS.............................................................................19
Output Waveforms.................................................................................................21
COLOR WHEEL ADJUSTMENT ........................................................................................21
BALLAST CIRCUIT......................................................................................................23
LAMP ON SEQUENCE CHART.........................................................................................23
BALLAST BOARD LAYOUT..............................................................................................23
BALLAST BOARD REQUIREMENTS ..................................................................................23
BALLAST BLOCK OPERATION.........................................................................................24
1. Generate 20KV to ignite the lamp:..................................................................24
2. Inform the microprocessor that the lamp is on and.........................................25
3. Internally monitor the lamp current:.................................................................25
4. Shut off HV to the lamp if it does not ignite:....................................................25

TESTING THE LAMP & BALLAST .....................................................................................26
1. Lamp Test:.........................................................................................................26
2. Ballast Test: .......................................................................................................26
3. Microprocessor test:..........................................................................................28
L BOARD LED INDICATORS...........................................................................................29
DEFECTIVE LAMP SYMPTOMS, REPLACEMENT, & TIME RESET .........................31
LAMP END OF LIFE SYMPTOMS......................................................................................31
LAMP REPLACEMENT:...................................................................................................32
LAMP TIME RESET:.......................................................................................................33
Entry to the Basic Service Mode:...........................................................................33
Resetting the lamp time to 0: .................................................................................33
PROTECTION CIRCUITS – SHUTDOWN CAUSES....................................................35
OVERVIEW...................................................................................................................35
SHUTDOWN BLOCK DIAGRAM........................................................................................36
SHUTDOWN - POWER LED BLINKS 1X...........................................................................37
SHUTDOWN - POWER LED BLINKS 2X...........................................................................38
SHUTDOWN - POWER LED BLINKS 5X...........................................................................40
SHUTDOWN - POWER LED BLINKS 6X, 7X, OR 8X.........................................................41
SHUTDOWN - POWER LED BLINKS 9X...........................................................................41
SHUTDOWN - POWER LED BLINKS CONTINOUSLY...........................................................42
SHUTDOWN - TEMPERATURE LED BLINKS CONTINOUSLY.................................................42
VIDEO SIGNAL FLOW.................................................................................................43
VIDEO OUTPUT FROM LVDS INTERFACE IC ...................................................................44
LOSS OF LVDS SIGNAL................................................................................................45
APPENDIX....................................................................................................................47
I. SERVICE MODE FUNCTIONS & ACCESS ..........................................................47
SERVICE MODE FUNCTIONS..........................................................................................47
ENTRY TO BASIC SERVICE MODE: .................................................................................47
ENTRY TO EXTENDED SERVICE MODE ...........................................................................48
EXIT FROM THE SERVICE MODE.....................................................................................48
II. HEXADECIMAL CONVERSION............................................................................49
III. DISABLING THE LAMP:.......................................................................................50
IV. SCREEN REPLACEMENT....................................................................................51
V. SIDE A/V INPUT BOARD REMOVAL...................................................................52
VI. HOW TO USE THE EEPROM COPY JIG ............................................................53
VII. L BOARD REPLACEMENT & ALIGNMENT........................................................54
VIII. ALIGNMENT AFTER LIGHT ENGINE ASSEMBLY REPLACEMENT ................55

Features
Panasonic TV Models: PT-50DL54/ PT-60DL54
Wide Screen Projection HDTV / Monitor with DLP™ Technology
Figure 1 - Panasonic ™
DLP ™TV with remote
(not to scale)
Feature Type New
Screen Aspect Ratio 16:9 (wide screen)
Split Screen Picture 2 NTSC tuners
Cinema Processing 3:2 pull down ID circuit for 24 frame movies Yes
Display Format Capability 480i, 480p, 720p, 1080i formats from component
inputs. 480i only from composite video inputs.
Native Resolution
(no conversions) 720 x 1280 (720p) Yes
Digital Comb Filter 3D Motion Adaptive, Y-C separator
Video Enhancement 1 Progressive Scan Line Doubler
Video Enhancement 2 10 bit 60MHz A/D processing
Video Enhancement 3 Artificial Intelligence picture analysis
Video Enhancement 4 Edge correction circuit & wideband video output
Audio Enhancement 1 BBE ®Sound Processing
Audio Enhancement 2 Surround Sound
Audio Enhancement 3 Sound compression to avoid sharp audio bursts
Audio Output level Fixed / variable selected with speaker off
Speakers Four 8-ohm speakers
Power Rating 30 Watts @ 10% THD
11 A/V Inputs 2 TV, 3 composite, 3 component, HDMI ™(DVI
with digital audio), 2 RGB (15 pin D-sub connector) Yes
Plus 2 Photo Viewer
inputs SD memory card and a PCMCIA adapter (to accept other memory cards like Kodak, Sony, etc.) Yes
Lightweight 87 lbs (50”)
Auto Power-on (at plug in) For cable boxes
New Features * Game guard (lockout channels and video inputs),
* Rapid tune (return), * Channel info banner (XDS),
* Color temp control.
Yes
Service Aids Chassis half of TV is detachable. Lamp time info.
Shutdown Protection
Circuitry Monitors 6 internal points to protect the TV.
1

Feature – 3:2 Pull down Process
There are two parts to the 3:2 Pull down feature. The first is the background, explaining
the 3:2 process that originated in the movie-film world. The second is the 3:2 pull down
process found as a TV feature.
Background
Movie producers still shoot with mechanical movie film at 24 frames per second. This
film must be converted to 60 frames or pictures per second for the TV / Video world. A
telecine process does this using the 3:2 pull down strategy.
Duplicating the movie frames increases the number of movie pictures from 24 to 60.
The first movie frame is duplicated three times. The second frame is duplicated two
times. The third frame is again duplicated 3 times, and the process repeats. Five
frames are shown below as an example.
Movie Frame Electronic pictures
1 3
2 2
3 3
4 2
5 3
Video
Picture
3
2
1
13 Pictures from 5 movie frames
The duplication process is repeated until the 24 frames become 60 frames for TV.
Telecine process for movie-film to video conversion:
Duplicates each odd frame by 3 = 12x3 = 36 pictures
Duplicates each even frame by 2 = 12x2 = 24 pictures
60 pictures from 24 movie frames
TV feature - 3:2 pull down
Refer to figure 2. Normally a progressive scan TV combines two (odd + even)
interlaced pictures to produce a single progressive picture. After the telecine process,
an interlaced picture can consist of two different pictures. When they are merged in
progressive scan for a high-resolution image, different areas of the two pictures are
blurred.
1 field 1 field
Odd
line Even line
Merged
even + odd
line fields =
Progressive
picture
Odd
lines Even
line
1 field 1 field
Blurred
Progressive
pix
(no 3:2 pull
down)
Figure 2 - Combining interlaced pictures
2

When the 3:2 pull down feature is enabled (from the user menu):
1. The TV examines the incoming video to determine if the signal is in the 3:2 pull
down telecine format.
2. The microprocessor then reorganizes the images so that two identical pictures
are recombined to produce a single clear high-resolution picture. Identical
pictures produce no blur.
Feature – Display format = 720p native resolution
This TV accepts all the new ATSC video standards. For any format that is input, the TV
converts the signal to a digital 720p resolution before presenting it on the screen.
The 720p format is of a higher resolution than the 1080i format, even though the latter
has a larger number. This is because the 1080i-interlaced picture only displays ½ the
number of lines per picture (two pictures complete an interleaved image / frame).
Therefore, the 1080i picture presents a 540-line picture at one time while the 720p
signal presents a 720-line picture.
Feature – HDMI ™
HDMI is a single A/V interface that connects two AV units and transfers digital, non-
compressed, high-definition video and audio data. Unlike DVI, HDMI allows
simultaneous transfer of multiple channels of audio, making it ideal as a high-definition
digital interface for relaying HD broadcasts in a single multi-wire HDMI cable. Figure 3
shows the difference between the DVI video plug and the smaller HDMI A/V plug.
DVI socket
3 x 8 = 24 pins
HDMI
socket
19 pins
DVI HDMI
Adapter p/n
TY-SCH03DH
To TV rea
r
Figure 3 - DVI vs. HDMI connectors
Additonal Features
Game Guard –requires a password to activate from the menu. User has a choice of
locking out channels and video inputs.
Rapid tune – is a button on the remote control to return to the previous TV channel.
XDS – When activated from the menu, it displays the information of the TV station being
transmitted. The TV station may elect to show (via OSD), the program name or time or
next program. When the station call letters are always displayed (instead of being
turned off by the user) it is called a station ID “watermark”. XDS = Extended Data
Service.
Color Temperature control – The user has a choice of two background color
temperatures (white balance).
3

4

DLP ™Concept
The most recent of the projection TV systems is Digital Light Processing ™Technology
or DLP ™. DLP ™Technology, after being conceived in 1987, was brought into the
practical market by Texas Instruments technologies recently.
The DLP ™system consists of 4 main sections (refer to figure 4):
1. Lamp
2. Color wheel
3. Digital Micro-Mirror Device (DMD)
4. Projection Lens
Figure 5 - Nine
Mirrors Magnified
Figure 4 - DLP ™System
Lamp
See figure 4. The system starts with a white, high brightness lamp. This mercury vapor
lamp has two electrodes and no filaments. Since there are no filaments, more voltage is
required to start the lamp, unlike a fluorescent bulb. However, the mercury lamp has a
longer life. As in a fluorescent bulb, once the arc is started across the electrodes
(between the filaments in a fluorescent bulb), the operating current is limited and
regulated to maintain consistent brightness.
Color Wheel
The light generated by the lamp passes through the spinning color wheel panes. See
figure 4. The color wheel is driven by a 3-phase motor (not shown) that starts when the
TV is turned on.
As the wheel rotates, it produces synchronization pulses that are delivered to the DMD
video circuit. The sync pulses “cue” the video, which has already been regrouped into
RGB bursts by the DMD circuitry (not shown).
5

DMD
Operation
Refer to figures 4 & 5. The colored bursts of light shine on the mirrored surfaces of the
DMD device. The DMD surface consists of over a million tiny mirrors. Each mirror
measures less than 1/5th the width of a human hair and can either tilt +12 degrees
toward the lens to produce a light on the screen or tilt –12 degrees in the other direction
(off), directing the light into oblivion (dark area). A piezo-electric driven device tilts each
mirror when voltage is applied. Since the mirror can tilt in any one of the two directions,
the system is digital (on or off).
Brightness
Brightness levels between full on and full off are created by turning the mirror on a
number of times in a given period. The more times it is on, the brighter that pixel seems
to appear. The human eye averages the brightness levels.
Color Blends
Figure 6 shows how different colors are created in this system. The 3 mirrors shown
represent one DMD micro mirror of the device. At the single pixel on the screen, when
the green light is sent into oblivion (off), a magenta screen is perceived because the
brain combines the red and blue lights that are reflected through the lens onto the
screen.
pixel
g
reen
blue
red
Figure 6 - A DMD mirror producing magenta after a full RGB cycle
6

Board P/N, Layout and Interconnections
Figure 7 - Board & Connector Layout
Board List PT-50DL54 / PT-60DL54 Primary Board complement:
1. Light Box L Board
2. Ballast B Board
3. Color Wheel CW Board
4. Tuner TU Board
5. Power supply P Board & PS Board
6. Rear input H Board
7. Digital / HDMI input DG Board
8. Audio Output Z Board
9. Side input board G Board
Table 1 - 9 Board Complement
Board Interconnections
Board to Board interconnections
Audio Board (Z) connector destinations Tuner Board (TU) connector destinations
Part number = TNP2AA193S Part number = TNP2AA192S
Z1 H4 (rear input) TU1 DG11 (digital board)
Z2 P6 (PS Bd.) TU2 H2 (rear input)
Z3 Speakers TU3 PS8 (power supply)
7

Interconnect Board connector destinations Light Box (L) connector destinations
(PS Bd.) Position & Focus adjustments needed
Part number = TNP2AA187S Part number = TXN/L01RPAS (L Bd.)
PS1 P7 (power supply) L1 DG4 (digital board)
PS2 DG5 (digital board) L2 Color wheel
PS3 Small PS fan L3 Color wheel
PS4 Large lamp fan L4 P9 (power supply)
PS8 TV3 (tuner board) L5 DG15 (digital board)
Digital Board connector destinations Power Supply (P) connector destinations
DG Bd. Part number = TXN/DG01RP4S P Bd. Part number = TNP2AA181S
Use EEPROM copy jig to transfer memory
DG1 B2 (ballast) P1 B1 (ballast board)
DG2 P5 (power supply) P4 Lamp door sw & thermal sw
(series)
DG4 L1 (light box) P5 DG2 (digital board)
DG5 PS2 (interconnect) P6 Z2 (audio board)
DG8 Side A/V input board P7 PS1 (interconnect board)
DG11 TU1 (tuner board) P9 L4 (light box)
DG12 Front panel Power buttons
DG15 L5 (light box)
Side input board connector destinations * Front keyboard connector destinations *
Part number = TNP2AA184S Part number = TNP2AA186S
G1 H1 K1 DG12
G2 DG8
* See tips for easier access and removal of these boards
Rear input board connector destinations Color Wheel assembly inside light engine
Part number = TNP2AA180S Part number = TNP2AA185S
H1 G1 (side input board) Drive L2
H2 TU2 (tuner board) Fdbk L3
H4 Z1 (audio out board)
Table 2
Part numbers for common parts
These are the part numbers for the commonly used parts and the part numbers that are
difficult to find. Miscellaneous Chassis Part Numbers
Description P/N Adjustments after replacement
Lamp (TYLA2004) TYLA2004J Reset lamp time (see Service Mode)
Thermal fuse (above lamp) K5X120AH0001 none
Fan – Large FBL12G12LS none
Fan - Small FBA06A12HS none
Remote Control EUR7627Z20
Table 3
Assemblies / Boards
8

1. Ballast EUBMM021A10 none
2. L Bd. (DMD – Elect) TXN/L01RPAS Mech adjustment (see appendix)
3. Optical Assembly (Mech) TXG200RPAS See service manual for removal.
4. DG Bd. (Digital Video,
Microprocessor, EEPROM). TXN/DG01RP4S Copy EEPROM data before replacement (see appendix)
5. CW Assembly (Color Wheel) TXFEN01RP4S Sync adjustments (see Service
Mode)
6. P Bd. (power supply) TNP2AA181S none
7. PS Bd. (PS regulators) TNP2AA187S none
8. Z Bd. (audio) TNP2AA193S none
9. TU Bd. (tuner) TNP2AA192S none
10.H Bd. (rear input board) TNP2AA180S Check top H5 and H6 seating.
11.G Bd. (side input board) TNP2AA184S none
12.K Bd. (front button board) TNP2AA186S none
Table 4
9

10

Power-on Sequence
After the unit is plugged in, the microprocessor responds to a power-on command.
First, the power supply turns on. Second, both fans rotate, then the color wheel rotates,
the ballast and the lamp turn on, and finally the microprocessor un-mutes the audio and
video, completing the power-on sequence. At turn-on, the TV power LED blinks green.
When the picture and audio are un-muted, the power LED changes to a solid green.
However, if the unit shuts down, the blinking green changes to flashing green. The
cause of the shutdown can be determined by counting the number of times the LED
flashes before it begins repeating itself.
The power-on details of a working TV are listed in table 5, showing that each action in
the chain is measurable. Use table 5 to find which step failed.
Power-on Sequence
Action Path Proof
1. Plug into AC Standby 7Vdc from the P Bd. to
the DG Bd. microprocessor 7Vdc at P5/pin 9
2. Press Power button
(front panel or remote) Microprocessor turns on the power supply and mutes A/V. Power-on LED blinks green.
3. Microprocessor’s
power-on command is
applied to the AC relay.
The power-on signal goes
through the chassis lamp door
switch and thermal breaker
before getting to the AC relay.
Power-on relay clicks.
Surge relay clicks.
(Two relays total.)
4. Two fans come on. Micro. uses CW assembly temp
sensor to control fan. a) Lamp fan (large) b) Power supply fan
5. Color wheel (CW)
starts L Board drives the motor in the CW assembly. Audible whirling sound from CW left of the ballast.
6. DLP light engine L
board receives power
and data.
Power supply powers the L
board & microprocessor sends
logic levels to indicator LED on
the L board.
Two of the four red LEDs
on the L board light up
proving that power and
data are input.
TV power = 0.5A @
120Vac
7. Lamp on Micro sends a “lamp on” signal
to the ballast assembly.
Micro lights the L Bd’s 3rd LED
when this command is issued.
Lamp lights up 5 seconds after
the power button is pressed.
Ballast powers the lamp.
On the L Bd., the 3rd red
LED lights up = the “ballast
on” command was sent.
TV power = 1.5A @ 120Vac
8. Microprocessor is
informed that the lamp
is lit.
Ballast detects that the lamp is
drawing current and informs the
micro that the lamp is lit.
Output at B2/pin 3:
0Vdc = lamp on
5Vdc = lamp off
9. Microprocessor
responds to the lamp lit
input.
Micro acknowledges the
ballast’s “lamp on” information
and outputs a high to L5/pin 8
1. Power LED turns green.
2. A/V is un-muted.
3. L Bd. 4th LED lights up.
Table 5
11

Power Off Sequence
1. Press power off.
2. A/V is muted.
3. Power LED blinks yellow.
4. Color wheel stops.
5. 3 of 4 internal light box LEDs darken.
6. Lamp goes off 10 seconds after pressing the power-off button but both fans stay
on.
7. After the lamp turns off, the Microprocessor counts 20 more seconds, and then
opens the power relay, so that only the standby 7Vdc remains active (fans and
lights go off).
12

Standby & Power-on Circuit
Standby Circuit
Refer to figure 8. When the PT-xxDL54 TV is plugged into an AC outlet, Standby 7Vdc
is output to the P (power supply) board at P5/pin 9. Within the P board, a small 60 Hz
transformer (T802) and a bridge rectifier (D882) is used to produce the standby voltage.
The P board’s standby voltage is sent to the DG board (DG2/pin 9) where the standby
7Vdc is regulated to 5V. This standby 5V is applied to Microprocessor IC1103.
Figure 8 - Standby & Power-on Block Diagram
Power-on Circuit
Refer to figure 8. Once standby voltage is available at microprocessor IC1103, it
responds to a power-on command either from the remote (via IR receiver) or from the
front panel power button (both not shown). At power-on, the DG board
microprocessor’s “AC_SW” output produces a high (5V) measured at DG2/pin 5. This
High passes through DG2/pin 5, P4/pin 4, and the thermal breaker mounted above the
lamp compartment. This voltage then passes through the lamp door switch before
returning to the P board at P4/pin 1.
13

Within the P board, this High is applied to the relay driver Q842 through the current
limiting resistor R886. Q842 energizes the main AC relay RL802 so its contacts apply
voltage to two power supplies:
1. Ballast Power Supply – produces regulated 330Vdc
2. Main TV Power Supply – produces 10 voltages necessary for TV operation.
5 volts from the Main Power Supply is also used to energize the surge relay so that the
surge resistor (R801) is bypassed after power-on.
Troubleshooting Scenarios
Symptom - Dark screen, no audio. The power LED either is off or continues to blink.
Refer to figure 8.
a. Power LED Off, no relays click - If the Power LED does not light up when the
power button is pressed (normally blinks green), there is no standby power going
to the microprocessor IC1103.
Check for standby 7V, leaving the P board at P5/pin 9. If the voltage is missing,
remove the load, by unplugging the P5 connector and measure P5/pin 9 (board).
Without a load, the standby 7V source normally measures 12Vdc. If the voltage
is missing or low, the problem is on the P board.
b. Power LED blinks continuously, no relays click - If there is a blinking green power
indicator, but no relays click when the power button is pressed, the power-on
signal output from the microprocessor, at DG2/pin 5 is not getting to the power
relay RL802.
Check for constant 5Vdc at P4/pin 1 after the power button is pressed (while the
green power LED blinks). If this P4/pin 1 voltage is missing, work backwards to
its source at DG/pin 5.
However, if this P4/pin 1 voltage is present, the problem is on the P board (Q842,
RL802, low standby voltage, etc).
c. Power LED blinks continuously, relays click - If there is a blinking green power
indicator, but the relay(s) do click, the Main Power Supply or / and the ballast
supply is not working. Microprocessor IC1103 monitors both supplies and shuts
off the TV relay (RL802) if either 3.3Vdc from the Main Power supply or the lamp
ballast current is missing. Find out which power supply is not working.
Check voltages from both the power supplies to determine which is not working.
d. Power LED blinks in a pattern and repeats itself, relays click (TV on) once and
click again (TV off) - TV is shutting down. The protection circuit has sensed a
problem and is shutting down the TV. An example in this diagram is at P5/pin 3
that monitors 3 voltages from the power supply board. See the protection circuit
section of this book.
Voltage Distribution
The purpose of the voltage distribution diagram (figure 9) is to show the loads
connected to each power supply line. From this you can see what boards can load
down (short) the individual power supply voltages from the P board to cause the TV to
shutdown. Disconnecting the individual lines or measuring for low resistance is useful
for locating the short that caused the TV to shutdown.
14

Although resistance measurements vary greatly depending on the type of ohmmeter,
table 6 shows resistance values that you can use for relative measurements. All
resistance values were taken using the same range (ohmmeter ranges have different
output voltages and current, so readjusting the meter ranges could not be done for
relative measurements).
Figure 9 - Voltage Distribution
Power Supply Load Resistance Readings to Ground
Load Location Resistance * Destination
+20V line P6/pin 1 800 ohms increasing
to infinity Audio amp Z Bd.
- 20V line P6/pin 4 0.754 k ohms Audio amp Z Bd.
5V reg. line P7/pin 5 infinity DG Bd. via PS Bd.
8V line P7/pin 7 infinity 5V regulator PS Bd.
3.3V reg. line P9/pin 1 0.331 k ohms LCD Engine L Bd.
9V reg. line P9/pin 3 0.330 k ohms DG Bd.
5V reg. line PS2/pin 5 0.308 k ohms DG Bd.
3.3V reg line PS2/pin 7 0.879 k ohms DG Bd.
2.5V reg. line PS2/pin 9 infinity DG Bd.
*Ohmmeter set to 2k-ohm range. Negative lead grounded.
Table 6
15

16