TTI QPX1200 Service Manual

QPX1200

DC Power Supply

Service Manual

Manual Part Number 48511-1130 Issue 1

Table of Contents

Specification 2

EMC 5

Safety 6

General 7

Circuit Descriptions 9

Calibration Procedure 17

Parts List 19

Component Layouts 35

Circuit Diagrams 37

1

Specification

General specifications apply for the temperature range 5°C to 40°C. Accuracy specifications apply
for the temperature range 18°C to 28°C after 1 hour warm-up with no load and calibration at 23°C.
Typical specifications are determined by design and are not guaranteed.

OUTPUT SPECIFICATIONS

Voltage Range: 0V to 60V

Current Range: 0.01A to 50A

Power Range: Up to 1200W

Voltage Setting: Resolution 1mV

Accuracy: 0.1% of setting ± 2mV

Current Setting: Resolution 10mA

Accuracy: 0.3% of setting ± 20mA

Operating Mode: Constant voltage or constant current with automatic cross-over

provided that the power demanded stays within the power
envelope, see graph. Outside of this envelope the output becomes
unregulated. CV, CI or UNREG mode indication in display.

QPX 1200
POWER ENVELOPE

Output Switch: Electronic, with ON indication.

Preset voltage and current displayed when off.

Output Terminals: Front panel safety terminals accepting 6mm wire diameter, 6mm

plugs or 8mm spades at 50 Amps max, or 4mm plugs at 30 Amps
max. Duplicate rear panel terminals.

Sensing: Switchable between local and remote. Screwless remote sense

terminals on both front and rear panels. Sense miswiring trip and
indication.

Ripple & Noise
(20MHz bandwidth):

Typically <3mVrms, <20mV pk-pk at maximum load, CV mode

Load Regulation: Change in output for any load change within PowerFlex envelope,

using remote sense:

Constant voltage: <0.01% ± 5mV

Line Regulation: Change in output for a 10% line change:

Constant voltage: <0.01% ± 5mV

Transient Response: <250us to within 100mV of set level for a 5% to 95% load change.

Output Protection: Output will withstand an applied forward voltage of up to 70V.

Reverse protection by diode clamp for reverse currents up to 3A.

2

Over-voltage Protection
(OVP):

Range 2V to 65V. Resolution 0.1V; accuracy: 0.2% ± 0.2V.
Response time typically 100µs.

Over-current Protection
(OCP):

Range 2A to 55A. Resolution 0.1A; accuracy: 0.5% ± 0.2A.
Response time typically 100ms.

Over-temperature Protection: The output will be tripped off if a fault causes the internal

temperature to rise excessively.

Temperature Coefficient: Typically <100ppm/°C

METER SPECIFICATIONS

Display Type: 5-digit (Volts), 4-digit (Amps), black-on-white backlit LCD.

Voltage (CI Mode and Unreg): Resolution 1mV

Accuracy: 0.1% of reading ± 2 digits

Current (CV Mode & Unreg): Resolution 10mA

Accuracy: 0.3% of reading ± 2 digits

V x A: Resolution 0·1W

Accuracy: 0·5% ± 0·1W

LOGIC CONTROL INPUT and OUTPUT

LOGIC IN is a rear-panel opto-isolated input that is activated at an input current greater than
approximately 1mA. User can set LOGIC IN (via the keyboard) to enable the output, disable the
output, or be ignored when it is activated.

LOGIC OUT is an isolated rear-panel open-collector output that will sink up to 2mA when activated
(‘switch closure’); the maximum voltage that can be applied to LOGIC OUT is 30VDC. User can set
LOGIC OUT to be ‘closed’ or ‘open’ for output enabled or disabled, current limit (CI mode), power
limit (UNREG mode), or for any fault trip.

ANALOG REMOTE CONTROL and MONITORING

Non-isolated inputs and outputs to set voltage and current limit and to monitor actual output voltage
and current. These signals are referenced to the positive output and have a range of 0 to 10V or 0
to 5V (selectable via the keyboard).

Analogue Control Accuracy: Voltage: 0.3% ± 4mV; Current: 0.5% ± 40mA

Analogue Monitor Accuracy: Voltage: 0.3% ± 4mV; Current: 0.5% ± 40mA

KEYBOARD & ROTARY CONTROL

All functions, including the selection and set-up of the remote control interfaces, can be set from the
keyboard. The rotary Jog control can be used to adjust output voltage and current settings in a
quasi-analogue mode.

DISPLAY FEATURES

The display is a 240 x 64 pixel transflective LCD, backlit by white LEDs; contrast is software­controlled and can be adjusted from the keyboard.

The default status display shows the VOLTS (5 digits) and AMPS (4 digits) in 10mm high characters,
plus the present output mode. At other times, for example during store or recall of instrument set­ups, the display shows up to 6 lines of information, instructions, or prompts.

3

INTERFACES

Full digital remote control facilities are available through the RS232 and USB interfaces. Setting and
readback resolutions are the same as the Output and Meter specifications respectively.

RS232: Variable Baud rate, 19200 Baud maximum. 9-pin D-connector.

Single instrument or Addressable RS232 operation.

USB: Standard USB 2.0 hardware connection.

Remote Command
Processing Time:

Typically <100ms between receiving the command terminator for a
step voltage change at the instrument and the output voltage
beginning to change.

GENERAL

AC Input: 110V – 240V AC ± 10%, 50/60Hz.

Installation Category II.

Power Consumption: 1600VA max.

Operating Range: +5ºC to +40ºC, 20% to 80% RH.

Storage Range:

−40ºC to + 70ºC.

Environmental: Indoor use at altitudes up to 2000m, Pollution Degree 2.

Store/Recall: Up to 10 set-ups can be saved and recalled via the keyboard or

remote interfaces.

Safety: Complies with EN61010-1.

EMC: Complies with EN61326.

Size: 130mm H (3U) x 356mm W x 413mm D

Weight: 9.2kg

Options: 19-inch rack kit.

4

EMC

This instrument has been designed to meet the requirements of the EMC Directive 89/336/EEC.

Compliance was demonstrated by meeting the test limits of the following standards:

Emissions

EN61326 (1998) EMC product standard for Electrical Equipment for Measurement, Control and
Laboratory Use. Test limits used were:

a) Radiated: Class A

b) Conducted: Class A

c) Harmonics: EN61000-3-2 (2000) Class A; the instrument is Class A by product category.

Immunity

EN61326 (1998) EMC product standard for Electrical Equipment for Measurement, Control and
Laboratory Use.

Test methods, limits and performance achieved were:

a) EN61000-4-2 (1995) Electrostatic Discharge : 4kV air, 4kV contact, Performance A.

b) EN61000-4-3 (1997) Electromagnetic Field, 3V/m, 80% AM at 1kHz, Performance B.

c) EN61000-4-11 (1994) Voltage Interrupt, 1 cycle, 100%, Performance B.

d) EN61000-4-4 (1995) Fast Transient, 1kV peak (AC line), 0·5kV peak (DC Outputs),

Performance B.

e) EN61000-4-5 (1995) Surge, 0·5kV (line to line), 1kV (line to ground), Performance B.

f) EN61000-4-6 (1996) Conducted RF, 3V, 80% AM at 1kHz (AC line only; DC Output

connections <3m not tested), Performance B.

According to EN61326 the definitions of performance criteria are:

Performance criterion A: ‘During test normal performance within the specification limits.’

Performance criterion B: ‘During test, temporary degradation, or loss of function or performance

which is self-recovering’.

Performance criterion C: ‘During test, temporary degradation, or loss of function or performance
which requires operator intervention or system reset occurs.’

Where Performance B is stated it is because DC Output regulation may deviate beyond
Specification limits under the test conditions. However, the possible deviations are still small and
unlikely to be a problem in practice.

Note that if operation in a high RF field is unavoidable it is good practice to connect the PSU to the
target system using screened leads which have been passed (together) through an absorbing ferrite
sleeve fitted close to the PSU terminals.

Cautions

To ensure continued compliance with the EMC directive observe the following precautions:

a) after opening the case for any reason ensure that all signal and ground connections are remade

correctly and that case screws are correctly refitted and tightened.

b) In the event of part replacement becoming necessary, only use components of an identical type,

see the Service Manual.

5

Safety

This power supply is a Safety Class I instrument according to IEC classification and has been
designed to meet the requirements of EN61010-1 (Safety Requirements for Electrical Equipment for
Measurement, Control and Laboratory Use). It is an Installation Category II instrument intended for
operation from a normal single phase supply.

This instrument has been tested in accordance with EN61010-1 and has been supplied in a safe
condition. This instruction manual contains some information and warnings which have to be
followed by the user to ensure safe operation and to retain the instrument in a safe condition.

This instrument has been designed for indoor use in a Pollution Degree 2 environment in the
temperature range 5°C to 40°C, 20% - 80% RH (non-condensing). It may occasionally be subjected
to temperatures between +5°C and –10°C without degradation of its safety. Do not operate while
condensation is present.

Use of this instrument in a manner not specified by these instructions may impair the safety
protection provided. Do not operate the instrument outside its rated supply voltages or
environmental range.

WARNING! THIS INSTRUMENT MUST BE EARTHED

Any interruption of the mains earth conductor inside or outside the instrument will make the
instrument dangerous. Intentional interruption is prohibited. The protective action must not be
negated by the use of an extension cord without a protective conductor.

When the instrument is connected to its supply, terminals may be live and opening the covers or
removal of parts (except those to which access can be gained by hand) is likely to expose live parts.
The apparatus shall be disconnected from all voltage sources before it is opened for any
adjustment, replacement, maintenance or repair.

Capacitors inside the power supply may still be charged even if the power supply has been
disconnected from all voltage sources but will be safely discharged about 10 minutes after switching
off power.

Any adjustment, maintenance and repair of the opened instrument under voltage shall be avoided
as far as possible and, if inevitable, shall be carried out only by a skilled person who is aware of the
hazard involved.

If the instrument is clearly defective, has been subject to mechanical damage, excessive moisture
or chemical corrosion the safety protection may be impaired and the apparatus should be withdrawn
from use and returned for checking and repair.

Make sure that only fuses with the required rated current and of the specified type are used for
replacement. The use of makeshift fuses and the short-circuiting of fuse holders is prohibited.

Do not wet the instrument when cleaning it.

The following symbols are used on the instrument and in this manual:-

Earth (ground) terminal.

mains supply OFF.

l

mains supply ON.

alternating current (ac)

direct current (dc)

6

General

Service Handling Precautions

Service work or calibration should only be carried out by skilled engineers using high quality test
equipment. If the user is in any doubt as to his competence to carry out the work, the instrument
should be returned to the manufacturer or their agent overseas for the work to be carried out.

The tracks on the printed circuit boards are very fine and may lift if subjected to excessive heat. Use
only a miniature temperature-controlled soldering iron and remove all solder with solder wick or
suction before attempting to remove a component.

Dismantling the instrument

WARNING!

Disconnect the power supply from all voltage sources before it is opened for adjustment or repair.
Capacitors inside the supply may still be charged even if the supply has been disconnected from all
voltage sources but will be safely discharged about 10 minutes after removing power.

If any adjustment or repair of the opened supply under voltage is inevitable it shall be carried out
only be a skilled person who is aware of the hazard involved. The incoming AC supply to the unit
under test should be isolated for safety by means of a 1:1 isolation transformer of at least 1500VA.

High voltages (up to 400V) are always present in the primary-side circuits on both the PFC board
and Power board; on the Power board the primary side occupies a clearly defined area at the rear
of the board.

1. Remove the 4 side screws to release the top cover.

2. To gain access to the Control PCB and Keyboard, release the front panel assembly from the
chassis by removing the 2 M3 side nuts, the countersunk M3 screw securing the top bracket,
and the 4 M3 screws (with integral shakeproof washers) along the bottom edge.

3. Keyboard: Remove the 5V supply from PJ4, the 4 connections to the mains switch, and the
3-way connections to the Control (PJ10) & Interface (PJ9) boards. The Keyboard is released
from the front panel by removing the 7 screws which secure it.

4. Control: Remove the 10-way connector (PJ100) to the Power board, noting polarity (corner
marker to pin1); remove the flat cable connection to PJ101 and the 3-way connection to the
Keyboard (PJ105). Remove the nuts which secure the front and rear output connecting
cables from the terminals on the front panel/Control board after noting their positions. To
release the Control board remove the 3 M3 screws to the front panel plus the 3 nuts which
secure it directly to the +, −, & earth terminals. When re-assembling do not forget the brass
bus-bar between the Red output terminal and the current measurement shunt connection.

5. PFC: Remove the 5V supply to the Keyboard (at PJ2) and the mains connections at W1,
W2, W3 &W4; when reassembling note that W1 & W4 (to the front panel switch) share a
ferrite sleeve and W2 & W3 (return from the switch) share a ferrite sleeve. Remove the 4­way primary AUX connection at PJ1 ( note the position of ferrite sleeve at the Power board
end of the connection) and the HT connection at FAS5, FAS6 & W5. To release the PFC
board from the chassis remove the 9 M3 screws (with integral shakeproof washer) from the
underside of the chassis, leaving the support pillars attached to the board assembly. Ease
the board forward a little in the chassis, so that the safety earth connection to the rear panel
can be undone, and lift the board free.

7

6. Power: Remove the 10-way connector (PJ5) to the Control board, noting polarity (corner
marker to pin1); remove the flat cable connection to PJ4 at the rear of the board; remove the
HT connection from the PFC board at FAS1 & FAS2; remove the 4-way primary AUX
connection from the PFC board at PJ1; remove the 3 2-way fan power connections
(PJ6,PJ7, PJ8); remove the 2 M6 barb nuts which secure the output cables to the front
panel. To release the Power board from the chassis it is first necessary to remove the 3

rd

,
internal, fan; push out the centres of the 2 plastic push-rivets which secure the top of the fan
to the bracket and lift out the fan with its lower bracket still attached. When re-assembling
note that the fan label faces the transformer (airflow towards the transformer). Remove the
10 M3 screws (with integral shakeproof washer) from the underside of the chassis, leaving
the support pillars attached to the board assembly, and lift the assembly forward and up.

7. Interface: Remove the 3-way connection to the Keyboard at PJ3. The Interface board is
secured only by the RS232 screwjacks; undo these to release the board.

8. When reassembling, take great care to ensure that all connections are exactly as before
dismantling and that no insulation creepage and clearance distances have been
compromised. Ensure that only the correct fasteners have been used otherwise earthing,
and hence EMC and safety performance, may be impaired.

8

Circuit Descriptions

PFC Board

Mains Input, Filtering and Rectification

The AC input is via PJ3, a pcb mounted IEC plug, and fuse FS1.

X-capacitors C1, C4, C7, C10 & C68, together with the Y-capacitors C5, C6, C11 & C12, common
mode inductors L1, L2 & L3 and differential inductors L4 & L8 comprise an input filter which ensures
that the supply meets both conducted emission and conducted immunity EMC requirements.

VD1 clips mains spikes for component protection, while R1 discharges the X-capacitors after
removal of the mains supply.

Pcb mounted fuse FS1 limits damage on boost-stage or forward converter failure. The front panel
mains switch is connected via connectors W1, W2, W3 and W4.

The bridge rectifier comprised of D1, D2, D3 and D4 has C13 and C14 connected across it to
bypass noise signals and to snub reverse recovery transients in the bridge rectifier.

C15, C16 further decouple the input filter and rectifier from the boost converter.

R2 limits the initial inrush current into the boost stage output capacitors C19 and C20 and is by­passed by relay PL1 once the boost converter starts.

Auxiliary Supplies

Primary Side

The primary auxiliary supplies are generated by IC5. This is a 7 pin TO220 style device which
incorporates the control circuitry and power switch to implement an off line flyback power supply.
It derives its power from the boosted HT rail.

R93 sets the power switch peak current to 0.4A. D20, R55 and C47 clamp the drain voltage of the
power switch at a safe level. The low voltage output of transformer T9 is peak rectified by D21 and
C49 . The output voltage is regulated to 24V by zener diode D22 and feedback to the control pin is
via opto coupler IC15. The 24V rail powers the fans.

IC6 generates an 18V rail for the PFC control IC4.

IC7 generates a 15V rail for the power pcb primary control circuit.

Secondary Side

A 5V supply for the front panel keyboard is generated by IC9. This is an 8 pin SMD style device
which incorporates the control circuitry and power switch to implement an off line flyback power
supply.

It derives its power from the AUX_HT line, which is generated by D36, D37 and C81, C37. This rail
is decoupled from the HT boost rail. When the mains supply is switched off, this AUX_HT rail falls
quickly and the front panel display vanishes very rapidly.

Start-up Control Circuit

D23 and R58 provide a 5.1V reference voltage to the negative inputs of all 4 op-amps of IC8.

When the mains is switched on, potential divider R59, R59B, R60, R60B and R61 feeds the
attenuated full wave rectified mains voltage to the positive input of IC8-A.

The bulk storage capacitors C19, C20 are being charged via inrush current limiting resistor R2.

When the mains voltage exceeds approximately 80Vrms, the output of IC8A begins to produce
pulses, which charge C21 via D24. When the mains voltage reaches approximately 87Vrms, the
voltage on C21 exceeds the reference voltage on IC8-B negative input and the output of IC8-B goes
high, charging C55,C56 via R67.

9

After a delay of about 0.4s, the voltage on C55, C56 exceeds the reference voltage on IC8-C
negative input and the output of IC8-C goes high, turning on Q8 via D29 and R74 thus energising
RL1 which bypasses the current inrush resistor R2.

The output of IC8-C also charges C58 via R70 thus producing a short delay before the output of
IC8-D goes high and turns on Q9 which in turn switches Q10 and Q11 off. When Q11 goes off, the
SS signal is no longer clamped to 0V and allows the PFC control IC4 to start up.

When the mains voltage is switched off, C21 is no longer supplied with top-up pulses and is
discharged by R64. IC 8-B output goes low and quickly discharges C55, C56 via D25. IC8-C output
then goes low and immediately turns off Q9 via D28. This causes Q11 to come on, clamping the SS
signal to 0V and stopping the PFC control IC4.

IC8-B output going low, discharges C58 via R71 and D26, thus providing a short delay before IC8-D
output goes low and switches off the bypass relay driver Q8.

The above timing sequences ensure that the inrush relay RL1 contacts only switch under zero load
conditions.

Primary Boost stage Control circuit

The primary boost stage control is by means of IC4.

This contains all the processing circuitry to shape the current taken by the power supply from the
mains supply to be sinusoidal and in phase with the voltage.

For a detailed description refer to the ST ‘Power Factor Corrector Applications Manual‘.

When the mains is switched on, the +18V supply to IC4/pin19 is established and IC4 becomes
active after a short delay when the SS signal is released by the start-up control circuit. During this
short delay the bulk storage capacitors C19, C20 are charged via the inrush-limiting resistor R2.

IC4 starts up and supplies drive pulses to the gate ICs IC1, IC2, IC3, which drive the gates of the
boost MOSFETs Q1, Q2, Q3, Q4, Q5, Q6.

C44 is connected to the soft start pin of IC4 and provides a soft start.

R34, R34b, R35, R35b, R37, C35, C35b, C36, C36b form a two stage RC filter to feed a voltage
proportional to the mains voltage to IC4/pin 7 which, after an internal 1/V

2

transformation, is fed to

the internal multiplier. For a universal mains input, the voltage at this pin will vary between 1.5V and

5.5V.

R38+R38a and R39+R39a supply a current derived from the full wave rectified mains voltage to
IC4/pin 4 to be used by the internal multiplier.

Also fed to the internal multiplier is the output of the voltage error amplifier of IC4/pin 13. The input
to the error amplifier at pin 14 is from potential divider R41, R41b, R42, R42b, R62, R63 and VR1.

This potential divider monitors the voltage on the boost stage output capacitors C19, C20 and this is
compared to an accurate internal reference voltage. Thus a steady voltage of about 395V, as set by
VR1, is maintained across C19, C20.

Another potential divider R44, R44b, R45, R45b, R46 monitors the voltage across C19, C20 and
feeds into pin 3 of IC4 which is the over-voltage shutdown. C80 slows the signal going into the
over-voltage pin to prevent the over-voltage circuit from activating during transient load changes.

Pin 8 is the output of the multiplier and is the programming current for the internal current error
amplifier. This signal is taken to the mains supply side of the current sense resistor R52 via R48.
The other input of the current error amplifier is taken to the other side of R52 via R50. The current
error amplifier thus compares the signal across the current sense resistor R52 with the
programming current and adjusts the PWM drive to the boost MOSFETs accordingly.

R49 and C42 with R50 form the compensation network around the current error amplifier.

10

Boost Stage

Three boost inductors L5, L6, L7 are each driven by a pair of MOSFETs Q3+Q6, Q2+Q5, Q1+Q4
respectively to raise the incoming, full wave rectified, sinusoidal mains voltage to a value some 30V
higher than the peak of the maximum rms input voltage. This is achieved by storing energy in the
boost inductors when the MOSFETs are conducting and transferring it to C19, C20 via boost diodes
D5, D6, D33 when the MOSFETs are turned off.

When the MOSFETs turn on, the boost diodes D5, D6, D33 are still conducting current. To prevent
large switch on losses, delay inductors L9, L10, L11 are placed in series with the MOSFETs. This
ensures that the current in the boost diodes is reduced at a gradual rate and the reverse recovery
time is minimised at the same time as the drain voltage of the MOSFETs is allowed to fall rapidly.

The energy stored in L9, L10, L11 is transferred to C18, C61, C62 via D19, D7, D8 and dissipated in
R23, R6, R9.

Snubber networks C22, R15, R19, C23, R16, R21, C24, R18, R22 reduce switch-off losses in the
MOSFETs.

The main boost heatsink is protected against excessive temperature by PTC2, IC12 and associated
components; once triggered it is necessary to turn the mains power off and on again to restart.

Power Board

Forward Converter

The 400V HT supply from the PFC board is connected to the Power board via FAS1 and FAS2 and
decoupled by C2.

C1 and C3 with their respective bleed resistors R149 and R150 form the voltage divider to feed the
converter transformer T1 of the half bridge forward converter.

The half bridge configured power MOSFETs Q28 and Q29 are connected to the converter
transformer T1 via the current transformer CT1 and ZVS inductor L2 and operate at a fixed duty
cycle of about 42% at a switching frequency of 73kHz. See the gate drive waveform in
Photograph1.

C4 and C12 work with L2 to facilitate zero voltage switching for Q28 and Q29.

R11, C16 and FB3 damp high frequency ringing across T1 primary. See photograph 02.

The gate drive pulses for Q28 and Q29 are generated by oscillator IC2-B/IC2-C feeding into IC3-A
to produce complimentary square waves at IC3-A pins 1 and 2.

The leading edges of these anti-phase square waves are slowed by R39/C37 and R42/C38 and
buffered by IC2-A,E,D,F to produce anti-phase pulse trains of the correct duty cycle to drive the gate
drive transformer T3 via Q13, Q15, Q17, Q18 and C35. The supply to the gate transformer drivers is
decoupled by C17, C28, C29, C30. The gates of Q28 and Q29 receive their anti-phase drive from
the secondaries of T3 via R52 and R73 and respective anti parallel diodes D1 and D2.

The output of the current transformer CT1 is full wave rectified by D16, D17, D22, D23 and loaded
with burden resistor R26. The voltage developed across R26 is utilised by two different circuits.

The first is to turn on Q11 via zener diode D27 when the current in the primary power switches
exceeds a certain value determined by R157 and R158. Q11 collector charges C26 negatively via
R21. When the voltage across C26 exceeds a threshold set by zener diode D10, latch Q9, Q14
turns on and pulls signal SDWN down to the P0V rail via D20. This in turn causes the power factor
correction circuit to shut down – requiring the removal of the mains supply in order to restart. This
would only happen under repeated short-circuiting of the output. Q9, Q14 latch can also be
activated by the signal OPTO1 via R102 – as would be the case when the voltage on the secondary
exceeds a value set by zener diode D5. The primary heatsink is protected against excessive
temperature by PTC TH3 which turns on Q16 and this in turn activates latch Q9, Q14.

The voltage developed across R26 is also utilised to regulate the fan speed. As the secondary
loading increases, the voltage across R26 is peak detected by D50 and C31 and sets a demand

11

voltage level at the positive input of op-amp IC14-A, the output of which turns on fan drive transistor
Q38. The fan current is monitored by R120, R121 and amplified by IC14-B to provide negative
feedback to the negative input of IC14-A.

Secondary Side

The main secondary winding is centre tapped and terminates on pins 19/20, 15/16 with the centre
tap on 17/18.

Snubber networks R7, C13 and C14, R18 across each half reduce high frequency ringing.

D47 and C80 generate a negative rail which bleeds a negative current from the output via resistors
R131 and R132.

The voltage on the secondary winding is rectified by D47 & D11, L-C filtered by L1, C5, C7, C8, C11
with flywheel diodes D6 & D7, and fed to a linear output stage comprised of MOSFETs Q3, Q4, Q5,
Q6. To minimise power dissipation in the linear output stage, the voltage across the MOSFETs is
monitored by error amplifier IC7-A (Sheet 2) which maintains the voltage across the linear output
MOSFETs to below 1V by adjusting the ‘Control’ signal to the synchronous post regulator MOSFETs
drive circuit (Sheet 3).

The synchronous post regulator MOSFETs Q2 and Q8 regulate the voltage across the linear output
MOSFETs by initially blocking the pulse from the secondary winding and only conducting after a
delay determined by the ‘Control’ signal.

Referring to Sheet 3, the drive to the post regulator MOSFETs is generated by two identical circuits
operating in anti-phase.

An auxiliary centre tapped winding on the converter transformer T1 terminated on pins 21, 22, 23,
and 24 generates the V+SEC and –8VSEC rails for the secondary control circuitry and also the
reference pulses AAA and BBB for the post regulator control circuit.

This description refers to the upper channel on sheet 3.

The reference pulse AAA is buffered and squared by AND gate IC10-B. The output of the AND gate
charges and discharges capacitor C58 via R66. The discharge time is shorter due to R69 and D41
conducting. The resultant triangular waveform is shown in photograph 03.

The long tail pair (LTP) comparator Q22 & Q23 switches when the triangle waveform at Q23 base
exceeds the reference voltage on Q22 base. The ‘Control’ voltage from IC7-A is fed to the base of
Q21 via R75 and VR3. The pulse width of the two sides is balanced by adjusting VR3.

Q21 emitter sets a pedestal level from which the charging of C58 begins.

The higher this pedestal level, the quicker C58 charges to the reference level on Q22 base and the
LTP comparator switches. This in turn switches Q20 which delivers a pulse to AND gate IC10-D
where it is gated with the AAA reference signal, the trailing edge of which has been slightly delayed
by R71 and C59.

The output of the AND gate IC10-D drives a MIC4428 driver IC, the antiphase outputs of which drive
the gate of the synchronous post regulator MOSFET Q2 via gate drive transformer T4.

Photograph 04 shows the triangular signal at the base of Q23 together with the pulse at IC10-D
pin 9. The reference voltage at the base of Q22 is coincident with the X-axis in the centre of the
oscilloscope screen.

To avoid uncontrolled post regulator conduction, Q32 and associated components ensure that the
‘Control’ signal is clamped to 0V during initial power-up.

The constant power limit is realised using analogue multiplier IC6.

The output voltage and output current are monitored by IC5-A and IC5-B respectively and the
resultant signals fed to the Y and X inputs of the analogue multiplier. The output of the multiplier is
of the form (X*Y)/10 +Z.

Z is a third input and is used to modify the power limit to give a lower power limit at high output
current. The correction signal is generated by IC15-B.

12

The signal across the current sense resistors R12, R13, R14 and R15 is fed into pin5 of IC15-B.
With the output current set to 20A, the signal at pin 5 is nulled by the current in R91/VR4 from the
negative voltage generated by zener D49. The null point setting is aided by comparator IC15-A
which drives two LEDs, the null being achieved when both LEDs are off .

Having nulled the voltage generated by the 20A output current in the current sense resistors, the
increasing current generates a voltage at the output of IC15B and this is fed to the Z input of the
analogue multiplier. The required level of correction is set by VR5.

The supply rails for the front panel control circuit are generated from an auxiliary winding on the
converter transformer T1 terminated on pins 13 and 14.

A V+ rail of approximately 10V is generated by D33, D34 and filter L4, C40.

A +15V rail is generated by D35, C43, R51 and D36.

A -8V rail Is generated by D38, C44, R55 and D37.

Photograph 1

Photograph 2

13

Photograph 3

Photograph 4

Control Board

The control board contains an ARM7 processor, IC111, programmed via JTAG header PJ103. The
three processors communicate via a shared bus but in this case it is isolated via opto-couplers
IC109 and IC110.

The board needs several power supplies and, with the exception on the ‘-8V’ and ‘+15V’ rails, these
are all derived from the ‘V+’ rail generated on the Power board and connected to the Control via
PJ100. IC117 generates a 5-volt rail, which is used to generate 3.3V via IC112, and finally IC113
generates a 1.95V supply for the processor core. In addition IC107d provides a power-fail signal
that ensures that data is saved at each power-off.

Regulation

The output current is sensed via shunt R143 and the signal amplified via IC116. This is fed into the
A/D converter IC102 and also into IC115c where it is compared against the demand to regulate the
current. Similarly IC115a and IC115d regulate the output voltage with the two loops having a diode
‘OR’ connection to give a clean crossover between constant voltage and constant power modes.
Unregulated mode is detected separately on the Power board. IC107a and IC107b provide signals
to the processor so that it knows what mode the power supply is in.

14

Demand Setting

The voltage and current demands, together with OVP limit and the pseudo-analogue outputs are
generated by a digital to analogue converter IC105 together with analogue switch IC106 and a
series of sample and hold circuits. For each of the 5 channels the setting consists of a both a
setting of a DAC reference and a value setting. Consider the voltage demand as an example. First
the processor sets the analogue switch IC104a directly across IC103 and sets IC106 to connect to
IC108a. Writing a suitable value to the DAC sets the reference for the next conversion. The
processor now opens the switch to the input of IC108a so that the setting is held. Next, switch

IC104 is switched so that R119 and R120 in circuit. This gives the correct reference for the demand
to be set. Now the processor writes the correct demand to the DAC and once it has had time to
settle, the output is switched via IC106 through to IC108b where the demand is held on C113. This
whole process is repeated in a similar way for each of the 5 channels. Note that the voltage
demand channel ‘Volts Set’ and the current demand ‘Amps Set’ have additional filtering to prevent
large over/undershoots when the demand is changed.

Measurement

The system accurately measures the output voltage and current and also external demand signals
for pseudo-analogue control. This is achieved via IC402, an analogue to digital converter. IC101a
provides a clean, buffered reference. This chip communicates with the processor via an SPI bus.

OVP

IC107c provides over-voltage protection. It compares the OVP limit, set by IC108d, with the output
voltage. When the output voltage becomes excessive it latches, pulling the voltage demand to zero
via Q111 and Q112. The processor can reset the latch via Q113.

Remote Sense

RL100 selects between remote and local sensing controlled by the processor via Q109. Q106 and
Q107 sense excessive drop down the sense cables, indicating a sense fault to the processor via
Q105, if appropriate.

Logic in and Logic Out

The system has input and output logic signals which communicate with the processor via buffer
transistors Q100 and Q101.

Keyboard

The keyboard processor IC2 acts as the system master initiating all communications within the unit;
it is programmed in-circuit using the standard JTAG port accessed at PJ3. PJ9 and PJ10 provide
the connections to the other boards in the system; Q2 and IC5 enable the processor to pull down
the data line, allowing it to go high only if none of the processors in the system want to pull it low.
The firmware operates a master-slave system to ensure there are no data clashes.

The board is supplied with 5V from the PFC board via PJ4. This is used to generate a local 3.3V
supply (IC4) and 1.95V supply (IC3). IC7a, together with Q1 and associated components, provide a
current source for the display LED backlight. IC7b and associated components provides a crude
under-voltage detect to ensure the processor starts and shuts down cleanly. IC6 is a simple latch
for the LEDS and the keyboard is scanned directly by the processor: this is a quiet scan that only
scans when keys buttons are pressed or released not when the keys are left open or held down.
The diodes D1 to D4 allow the processor to use some pins for two purposes (key-scan and LED).

The display is a 240x64 pixel LCD mounted directly on the keyboard PCB and connected via PJ6.
The display contains its own voltage multiplier to generate the required bias levels; the switched
capacitors and decoupling are provided directly on the pins of the display connector.

15

Interface Board

The interface board allows the unit to communicate externally via USB or RS232. IC5 is an ARM7
processor which is programmed in-circuit using the standard JTAG port accessed at PJ5.

IC3 and IC6 generate the required supply rails. PJ3 provides an RS232 connection; IC1 and IC2
provide the necessary level shifting and inversion to convert the UART’s 5V ‘mark’ and 0V ‘space’ to
RS232’s –5V mark and +5V space. They also allow for data to pass through from one unit to
another for TTi’s Addressable RS232 Chain (ARC). USB is controlled directly by the processor; Q1
switches R22 to provide a soft connect/disconnect feature.

PJ3 provides a shared connection between the boards in the system; Q2 and IC4 allow the
processor to pull down the data line (pin) allowing it to go high only if none of the processors in the
system want to pull low. The firmware operates a master-slave system to ensure there are no data
clashes.

16

Calibration Procedure

The QPX1200 calibration menu can be found under extra functions “#99”. The output calibrations
are dependent on the measurement being in calibration so it is recommended that each of the
calibrations be done in the order they appear on the menu.

Equipment Required

Voltmeter capable of reading up to 65 Volts with 1mV accuracy and up to 15V with 100µV accuracy,
a Current measurement system capable of measuring 60 Amps with 10mA accuracy, and resistance
less than 100mΩ (e.g. a 4-terminal shunt).

Procedure

01: Vout measurement calibration

Ensure that there is no load connected to the unit and connect the voltmeter directly across the front
panel output terminals. Select option 1 from the Calibration menu (Vout measurement) and press
OK. The unit now gives an output of about 1 Volt; measure it, enter the actual voltage (to the
nearest mV) and press OK. After a few seconds the output changes to about 50 Volts; measure and
enter this to the nearest mV, press OK. After a few seconds the display changes to the Calibration
menu again; output voltage measurement is now calibrated.

02: Vout setting calibration

Ensure there is no load connected to the unit. Select option 2 from the Calibration menu (Vout
setting) and press OK. The unit self-calibrates; during this time the output voltage will be switching
between different levels. After a few seconds the display changes to the Calibration menu again;
output voltage setting is now calibrated.

03: Iout measurement calibration

Connect the current measurement system directly across the front panel terminals. Select option 3
from the Calibration menu (Iout measurement) and press OK. The unit now gives an output of
about 1 Amp; measure it accurately, enter the actual current to the nearest mA, and press OK. After
a few seconds the output changes to about 50 Amps; measure and enter this to the nearest mA and
press OK. After a few seconds the display changes to the Calibration menu; output current
measurement is now calibrated.

04: Iout setting calibration

Connect the current measurement system directly across the front panel terminals or alternatively
connect a direct short-circuit. Select option 4 from the Calibration menu (Iout setting). The unit self­calibrates; during this time the output current will be switching between different levels. After a few
seconds the display changes to the Calibration menu; output current setting is now calibrated.

05: Vmon measurement calibration

On the rear panel terminals short ‘Vmonitor’ to ‘Vcontrol’. Ensure that there is no load connected to
the unit and connect the voltmeter from ‘Vmonitor’ to ‘Common’. Select option 5 from the
Calibration menu (Vmon measurement) and press OK. The unit now gives an output of about 1
Volt; measure the voltage at ‘Vmonitor’ and enter the output voltage this represents (e.g. 6 times the
voltage measured for the 0V to 10V range) to the nearest mV and press OK. After a few seconds
the output changes to about 50 Volts; measure and enter the voltage represented by the voltage at
‘Vmonitor’ to the nearest mV and press OK. After a few seconds the display changes to the
Calibration menu; output voltage control is now calibrated.

06: Vmon setting calibration

On the rear panel terminals short ‘Vmonitor’ to ‘Vcontrol’. Ensure there is no load connected.
Select option 6 from the calibration menu (Vmon setting) and press OK. The unit self-calibrates;
during this time the output voltage will be switching between different levels. After a few seconds
the display changes to the Calibration menu; output voltage monitor is now calibrated.

17

07: Imon measurement calibration

On the rear panel terminals short ‘Imonitor’ to ‘Icontrol’. Ensure that there is no load connected to
the unit and connect the voltmeter from ‘Imonitor’ to ‘Common’. Select option 7 from the Calibration
menu (Imon measurement) and press OK. The unit now gives an output of about 1 Amp; measure
the voltage at ‘Imonitor’ and enter the output current this represents (e.g. 5 times the current
measured for the 0V to 10V range) to the nearest mA and press OK. After a few seconds the output
changes to about 50 Amps; measure and enter the current represented by the voltage at ‘Imonitor’
to the nearest mA and press OK. After a few seconds the display changes to the calibration menu
output voltage control is now calibrated.

08: Imon setting calibration

On the rear panel terminals short ‘Imonitor’ to ‘Icontrol’. Connect the current measurement system
directly across the front panel terminals or alternatively connect a direct short-circuit. Select option
8 from the calibration menu (Imon setting) and press OK. The unit self calibrates; during this time
the output current will be switching between different levels. After a few seconds the display
changes to the Calibration menu; output current monitor is now calibrated.

18

Parts List

PCB ASSEMBLY - POWER - (44115-3060)

Part Number Description Position

20205-0800 STUD M6 x 20 HFHB M6-20-X OUTPUT CONNECTION

20234-0023 SCREW M4 x 8 PNHDPZ ZPST HEATSINKS

20234-0100 SCREW M3 x 6PNHDPZ C/W EXT SH/P PCB SUPPORT SPACERS

20613-0007 SIL-PAD TO220 PLAIN FOR TH1

20613-0026 SIL-PAD 900S 100MM X 25MM FOR HEATSINKS

20661-0225 SPACER Hex M3 x 12 NPBR PCB SUPPORT

20670-0135 CLIP GP02 FOR PCB MTG H/SINKS

20670-0310 HEATSINK PCB MTG 38MM PLAIN SK3

20670-0340 HEATSINK TO220 CLIPON 29DEG/W SK4

20670-0364 CLIP MAX01H FOR TO220+MAX H/S FOR TH1, TH3

20670-0365 CLIP MAX03H FOR TO247+MAX H/S FOR Q2-6, Q8, Q28, Q29, D3, D6-7, D11

20670-0550 HEATSINK MAX505 90MM PLAIN SK1

20670-0560 HEATSINK MAX505 210MM PLAIN SK2

22040-0940 BEAD (DOUBLE) - FERRITE FB1-7

22109-0130 TRANSFORMER GATE DRIVE T3

22109-0280 TRANSFORMR CURRENT SENSE CT1

22109-0370 TRANSFORMER HF POWER T1

22109-0400 TRANSF GATE DRIVE QPX POSTREG T4-5

22154-0160 CHOKE 1mH AXIAL 1.3 OHMS L3-4

22154-0770 CHOKE - OUTPUT -QPX L1

22154-0780 CHOKE - 3uH - ZVS L2

22455-0040 TAB 4.8MAX 0.8MM STR PCB MTG FAS1-2

22467-0130 TERMINAL BLOCK 2W R/A TB1-6

22482-0020 BEAD, CERAMIC 11-54-3557-0 FOR R12-15

22573-0086 HEADER 16W 2x8 LATCHING PJ4

22573-0210 HEADER 10 WAY STRAIGHT .156P PJ5

22573-0224 HEADER 4 WAY STR F/LOCK .156P PJ1 (FIT PIN 1 TO PIN 1)

22573-0247 HEADER 2 WAY STR .1P F/LOCK PJ6-8

22575-0038 HEADER 6 WAY STR SIL TP4, TP5

23185-0000 RES ZERO OHM R155, R156

23202-0100 RES 10R0F W60 MF 50PPM R37, R41, R52, R73

23202-0270 RES 27R0F W60 MF 50PPM R45

23202-1100 RES 100RF W60 MF 50PPM R2, R4-6, R49

23202-2330 RES 3K30F W60 MF 50PPM R33-34

23202-5680 RES 6M80F W60 MF 50PPM R27-28

19

PCB ASSEMBLY - POWER - (44115-3060) /continued...

Part Number Description Position

23210-0330 RES 33R0J 2W MF 250PPM R26

23210-1100 RES 100RJ 2W MF 250PPM R140

23210-1220 RES 220RJ 2W MF 250PPM R51, R141

23210-2470 RES 4K70J 2W MF 250PPM R127

23210-3470 RES 47K0J 2W MF 250PPM R131-132, R149-150

23215-2100 RES 1K00B W25 MF 15PPM R72, R85

23222-0022 RES 2R20J W33 MF FUSIBLE NRF25 R88

23222-0220 RES 22R0J W33 MF FUSIBLE NRF25 R56, R138-139

23222-0220 RES 22R0J W33 MF FUSIBLE NRF25 R50

23222-1220 RES 220RJ W33 MF FUSIBLE NFR25 R10, R17

23274-0042 RES 47RJ 2W5 WW R7, R11, R18

23274-0043 RES 0R015J 2W5 WW R12-15

23274-0320 RES 220RJ 4W WW R55

23275-0010 RES 47R0J 3W MO R8

23385-2100 RES PS/H 1K0 CF 6MM VR3

23385-3100 RES PS/H 10K CF 6MM VR1-2, VR5

23385-3470 RES PS/H 47K CF 6MM VR4

23388-0010 THERMISTOR PTC TAG 90 DEG TH1 ,TH3

23424-0469 CAP 220PK 1KV CER P5 C16

23424-0471 CAP 4N7K 1KV CER P7.5/P10 C4, C6, C12

23424-0472 CAP 2N2K 1KV CER P5/P7.5 C13-14

23428-0470 CAP 47PG 100V CER NPO P2.5 C59, C66

23557-0506 CAP 10U 63V ELEC P2 C25

23557-0667 CAP 220U 25V ELEC RE2 P3.5 C40

23557-0673 CAP 22U 35V ELEC RE2 P2 C10, C15, C20, C43-44, C53, C87

23557-0820 CAP 10U 50V ELEC LOW ESR P2 C17

23557-0827 CAP 470U 100V LOW ESR P7.5 C5, C7-8, C11 ,C18

23620-0236 CAP 1N0K 100V P/E P5 C27

23620-0252 CAP 2N2K 63V P/E P5 C37-38, C58, C64, C76-77

23620-0264 CAP 100NK400VP/E 368 SER P15 C80

23620-0267 CAP 100NK 100V P/E P5 C21, C26, C91-92

23620-0268 CAP 220NK400VP/E 468 SER P15 C22, C102

23684-0021 CAP 2U2K 400V P/P P27.5 C1-3

23685-0013 CAP 330NK 160V/250V P/P P15 C35

25021-0910 DIO BAV21 D1-2, D13, D15, D19, D29, D31, D35,

D38, D55

20

PCB ASSEMBLY - POWER - (44115-3060) /continued...

Part Number Description Position

23210-0330 RES 33R0J 2W MF 250PPM R26

25031-0100 DIO BAX12A D16-17, D22-23

25031-0150 DIO UF4006 D47

25031-0250 DIO STTH6003CW D3, D6-7, D11

25130-0207 DIO ZEN 15V W4 D25-26, D36

25130-0231 DIO ZEN 8V2 W4 D37, D56

25130-0915 DIO ZEN 75V W4 D5

25349-3500 TRAN PNP MJE350 Q37

25384-9001 TRAN PNP ZTX751 Q15, Q18

25388-0211 TRAN NPN ZTX651 Q13, Q17

25601-0490 TRAN MOSFET N CHAN 50V/60V Q38

25601-0710 TRAN MOSFET NCHAN HUF75652G3 Q3-6

25601-0750 TRAN MOSFET N CHAN STW45NM50 Q28-29

25601-0800 TRAN MOSFET NCHAN IRFP90N20DPF Q2, Q8

27001-0060 OPTO-COUPLER SFH615A-3 IC1, IC17-18

27160-0013 IC V/REG 7815 IC9

PCB ASSEMBLY SM POWER (44115-3061)

Part Number Description Position

22469-1000 TEST POINT SMT TP6,TP8-9,TP11-15

23105-0000 RES SM0805 ZERO OHM R97

23105-0010 RES SM0805 1R00F W1 R100

23105-0022 RES SM0805 2R20F W1 R120-121

23105-0033 RES SM0805 3R30F W1 R3, R24

23105-0100 RES SM0805 10R0F W1 R29, R144-145

23105-0220 RES SM0805 22R0F W1 R128, R130, R142-143

23105-0240 RES SM0805 24R0F W1 R158

23105-0750 RES SM0805 75R0F W1 R157

23105-1100 RES SM0805 100RF W1 R40, R43

23105-1470 RES SM0805 470RF W1 R25, R65, R76, R102, R125, R153-154

23105-2100 RES SM0805 1K00F W1 R20, R30-32, R39, R42, R64, R69-70,

R74-75, R80, R83, R90, R92, R117-118

23105-2180 RES SM0805 1K80F W1 R16, R99

23105-2220 RES SM0805 2K20F W1 R63, R107

23105-2300 RES SM0805 3K00F W1 R36

23105-2330 RES SM0805 3K30F W1 R44, R84, R86, R98, R147

23105-2470 RES SM0805 4K70F W1 R67-68, R77, R79, R81, R129

21

PCB ASSEMBLY SM POWER (44115-3061) /continued...

Part Number Description Position

23105-2510 RES SM0805 5K10F W1 R66, R78

23105-3100 RES SM0805 10K0F W1 R9, R22, R53, R58, R61, R71, R82, R87,

R89, R94, R96, R104-106, R109,
R112-115, R124, R126, R146

23105-3200 RES SM0805 20K0F W1 R137

23105-3220 RES SM0805 22K0F W1 R35, R46-47, R95, R108, R122

23105-3330 RES SM0805 33K0F W1 R21

23105-3390 RES SM0805 39K0F W1 R91

23105-3470 RES SM0805 47K0F W1 R57, R60, R123

23105-3620 RES SM0805 62K0F W1 R119

23105-4100 RES SM0805 100KF W1 R62, R110

23105-4220 RES SM0805 220KF W1 R19, R48, R54

23105-4470 RES SM0805 470KF W1 R111, R116

23105-4750 RES SM0805 750KF W1 R38, R101

23105-5100 RES SM0805 1M00F W1 R93

23461-0015 CAP SM0805 10NK 50V CER X7R C47-48, C65, C79

23461-0020 CAP SM0805 100N50V CER Y5V C19, C34

23461-0030 CAP SM0805 220NK 16V CER X7R C94-95

23461-0050 CAP SM0805 22NJ 50V CER X7R C85

23461-0300 CAP SM0805 100NK 25V CER X7R C24, C28-33, C36, C42, C45, C49-52,

C54-55, C57, C61-63, C67-70, C72, C75,
C88-90, C96

23559-5220 CAP SM 22U 35V AL ELEC C86,C93

23595-0100 CAP SM-B 4U7M 16V TANT C39

25021-0050 DIO SM BAV99 SWITCHING D9, D14, D18, D20, D28, D30, D32,

D39-44, D46, D50-52

25061-0300 LED SM - RED 3.2 X 2.8MM LED1-2

25132-0200 DIO SM ZEN 6V2 W35 D27

25132-0270 DIO SM ZEN 7V5 W35 D45

25132-0310 DIO SM ZEN 5V6 W35 D4, D8, D12, D24, D49

25132-0320 DIO SM ZEN 3V3 W35 D10

25334-1010 TRAN SM PNP MMBT2907A Q20, Q24

25340-1000 TRAN SM PNP BC859C Q9, Q16, Q31, Q34-35

25377-1000 TRAN SM NPN BC849C Q11-12, Q14, Q21, Q25, Q30, Q32, Q36

25381-1000 TRAN SM NPN SMBT3904 Q22-23, Q26-27

27106-1110 IC SM LM358M DUAL OP AMP IC5, IC8, IC14-15

27106-1210 IC SM LMC662CM IC7

22

PCB ASSEMBLY SM POWER (44115-3061) /continued...

Part Number Description Position

27151-1030 IC SM AD633 IC6

27227-0130 IC SM 4013 IC3

27227-0690 IC SM 4069 IC2

27227-0810 IC SM 4081 IC10

27253-0140 IC SM MIC4428 IC11, IC13

35555-4690 PCB - POWER

PCB ASSEMBLY CONTROL (44115-3180)

Part Number Description Position

10300-0324 PAD P/E S/AD 6 X 3MM FOR XTAL

20030-0263 WASHER M3 ZPST FOR R143

20037-0401 SOLDER TAG PLAIN - M4 FOR R143

20038-9501 WASHER M3 SPRING FOR R143

20210-0101 NUT M3 ZPST FOR R143

20210-0110 NUT M4 BARB FOR R143

20234-0023 SCREW M4 X 8 PNHDPZ ZPST FOR R143

20234-0024 SCREW M3 X 16 PNHDPZ ZPST FOR R143

20613-0016 SIL-PAD RECTIFIER FOR R143

20661-0873 SPACER TOWER 4.8OD X 6L FOR LED100

20670-0580 HEATSINK TO220 AAVID 7025B FOR R143

22240-0070 RELAY TYPE 47 (12VDC) RL100

22467-0120 TERMINAL BLOCK 2W LIGHT GREY SK100

22573-0048 HEADER 3WAY STR SIL STD/GOLD TP100

22573-0086 HEADER 16W 2x8 LATCHING PJ101

22573-0210 HEADER 10 WAY STRAIGHT .156P PJ100

22573-0248 HEADER 3 WAY STR .1P F/LOCK PJ105

22575-0065 HEADER 20 WAY 2X10 STR SKELN PJ103

23202-2100 RES 1K00F W60 MF 50PPM R136, R138

23215-2383 RES 3K83B W25 MF 15PPM R155, R219

23215-3909 RES 90K9B W25 MF 15PPM R156, R160

23215-4680 RES 680KB W25 MF 15PPM R103-104

23296-0060 RES 0R002 4 TERM PBV R143

23557-0731 CAP 100U 100V ELEC LOW ESR C120-121

23557-0841 CAP 47U 35V ELEC P2 C2

23620-0249 CAP 330NK 63V P/E P5 C112-117

23620-0268 CAP 220NK400VP/E 468 SER P15 C118-119

23662-0207 CAP 470PK 100V P/C P5 C30

23

PCB ASSEMBLY CONTROL (44115-3180) /continued...

Part Number Description Position

25061-0201 LED - T1 ROUND(3MM) RED LED100

25117-0020 DIO 1N5401 D110

27001-0050 OPTO-COUPLER 6N136 IC109-110

27160-0009 IC V/REG 7805 IC117

27161-0060 IC V/REF LT1009 2.50V IC100

28500-0800 XTAL - 4.9152MHZ-MICROPROCSR X101

28502-0020 RESONATOR CERAMIC 12MHZ X100

35358-0600 BUS BAR - CONTROL

PCB ASSEMBLY SM CNTL (44115-3181)

Part Number Description Position

23105-0000 RES SM0805 ZERO OHM R121-122, R185

23105-0220 RES SM0805 22R0F W1 R5

23105-0470 RES SM0805 47R0F W1 R112

23105-0560 RES SM0805 56R0F W1 R225

23105-1100 RES SM0805 100RF W1 R193

23105-1220 RES SM0805 220RF W1 R40-41, R220

23105-1270 RES SM0805 270RF W1 R105, R108, R173-174

23105-1330 RES SM0805 330RF W1 R126-131

23105-1430 RES SM0805 430RF W1 R144-145

23105-1560 RES SM0805 560RF W1 R7, R208

23105-2100 RES SM0805 1K00F W1 R123, R125, R137, R139, R150, R152,

R166, R175, R187-190, R196, R202,
R207

23105-2120 RES SM0805 1K20F W1 R6

23105-2200 RES SM0805 2K00F W1 R117-118

23105-2220 RES SM0805 2K20F W1 R124, R151, R204

23105-2270 RES SM0805 2K70F W1 R133

23105-2330 RES SM0805 3K30F W1 R111

23105-2360 RES SM0805 3K60F W1 R100

23105-2390 RES SM0805 3K90F W1 R135

23105-2470 RES SM0805 4K70F W1 R154, R168

23105-2680 RES SM0805 6K80F W1 R113

23105-2820 RES SM0805 8K20F W1 R114, R132, R147-148

23105-3100 RES SM0805 10K0F W1 R1-4, R106-107, R109-110, R142, R149,

R159, R162, R169-172, R176-183,
R198-201, R203, R205, R215, R222

23105-3150 RES SM0805 15K0F W1 R134, R209-210, R211, R218

24

PCB ASSEMBLY SM CNTL (44115-3181) /continued...

Part Number Description Position

23105-3200 RES SM0805 20K0F W1 R119

23105-3220 RES SM0805 22K0F W1 R163, R165

23105-3270 RES SM0805 27K0F W1 R217

23105-3470 RES SM0805 47K0F W1 R140-141, R191, R206, R212

23105-3680 RES SM0805 68K0F W1 R194, R197

23105-4100 RES SM0805 100KF W1 R120, R153, R164, R167, R192, R221

23105-4330 RES SM0805 330KF W1 R224

23105-4470 RES SM0805 470KF W1 R158

23105-4560 RES SM0805 560KF W1 R213-214, R223

23105-6100 RES SM0805 10M0F W1 R146, R195

23107-3270 RES SM0805 27K0B W1 25PPM R101-102

23407-0100 CAP SM0805 10P CER NPO C107-108

23407-0220 CAP SM0805 22P CER NPO C146-147

23407-0470 CAP SM0805 47P CER NPO C109, C123, C130

23411-1104 CAP SM1206 100NK 100V CER X7R C3-7

23461-0015 CAP SM0805 10NK 50V CER X7R C31, C165

23461-0020 CAP SM0805 100N50V CER Y5V C1, C100-102, C104-106, C111, C132,

C134, C137, C139, C141-143, C145,
C148, C150-C162, C166, C176

23461-0030 CAP SM0805 220NK 16V CER X7R C28, C168-169

23461-0040 CAP SM0805 1N0K 50V CER X7R C164

23461-0070 CAP SM0805 4N7J 50V CER X7R C124

23461-0300 CAP SM0805 100NK 25V CER X7R C170, C172

23559-4101 CAP SM 100U 25V AL ELEC C133, C135-136, C138, C140, C144,

C149, C167

23559-5100 CAP SM 10U 35V AL ELEC C103, C110

23595-0010 CAP SM-A 1U0M 16V TANT C163

23662-0108 CAP 2N2K 100V P/C P5 C30

25021-0050 DIO SM BAV99 SWITCHING D103, D116-117

25021-0070 DIO SM BAS116 D105

25021-1010 DIO SM BAS21 D100-102, D106-107, D111, D113-114

25031-1030 DIO SM ZHCS500 D1-2

25132-0100 DIO ZEN 3V9 W5 D104

25132-0320 DIO SM ZEN 3V3 W35 D3, D112

25340-1000 TRAN SM PNP BC859C Q100-101, Q103, Q105

25377-1000 TRAN SM NPN BC849C Q102, Q104, Q109-111, Q114-115

25391-0010 TRAN SM NPN BF820 Q106-107

25

PCB ASSEMBLY SM CNTL (44115-3181) /continued...

Part Number Description Position

25603-0220 TRAN SM FET N FDV303N 25V Q112-113

27103-1010 IC SM LM339A QUAD IC107

27106-0644 IC SM TL074CD BI-FET OP-AMP IC103, IC108

27106-1110 IC SM LM358M DUAL OP AMP IC114

27106-1160 IC SM LM324M OP AMP IC115

27106-1350 IC SM OPA277 PREC AMP TIC101, IC116

27153-1160 IC SM ADS1241 8x24ADC IC102

27153-1190 IC SM DAC8551 IC105

27160-1010 IC SM V/REG LM1117 ADJ IC113

27160-1030 IC SM V/REG LM1117-3V3 IC112

27227-0510 IC SM 4051 IC106

27236-0530 IC SM 74HC4053 IC104

27250-2190 IC SM MCU LPC2102 IC111

35555-4960 PCB – CONTROL

PCB ASSEMBLY – PFC (44115-3100)

Part Number Description Position

20234-0023 SCREW M4 X 8 PNHDPZ ZPST HEATSINKS

20234-0100 SCREW M3x6PNHDPZ C/W EXT SH/P PCB SUPPORT SPACERS

20613-0007 SIL-PAD TO220 PLAIN FOR TH2

20613-0026 SIL-PAD 900S 100MM X 25MM FOR HEATSINKS

20661-0225 SPACER Hex M3 x 12 NPBR PCB SUPPORT

20670-0340 HEATSINK TO220 CLIPON 29DEG/W FOR IC7 & IC5

20670-0364 CLIP MAX01H FOR TO220+MAX H/S FOR D5, D6, D33, TH2

20670-0365 CLIP MAX03H FOR TO247+MAX H/S FOR D1-4, Q1-6

20670-0550 HEATSINK MAX505 90MM PLAIN SK1

20670-0560 HEATSINK MAX505 210MM PLAIN SK2

22040-0901 BEAD FERRITE FX1115 FIT TO PIN 1 OF FET Q1-6

22040-0920 BEAD FERRITE - LEADED - B/R FB4-9

22040-0940 BEAD (DOUBLE) – FERRITE FB1-3

22109-0350 TRANSFORMER AUX 5V T1

22109-0380 TRANSFORMER AUX PRIMARY T9

22154-0210 CHOKE - 2uH L9-11

22154-0240 INDUCTOR BOOST L5-7

22154-0740 CHOKE 17.5uH/12A L4, L8

22154-0790 CHOKE 2mH/15A COMMON MODE L1-3

22240-0210 RELAY SPST (24V) G8P RL1

26

PCB ASSEMBLY – PFC (44115-3100) /continued...

Part Number Description Position

22312-0250 FUSE CLIP 0.25in. PCB MTG FS1

22315-0255 FUSE 15A HRC 1.25 X 0.25 FOR FS1

22455-0030 TAB 0.25in. STR PCB MTG W1-5

22455-0040 TAB 4.8MAX 0.8MM STR PCB MTG FAS5-6

22482-0020 BEAD, CERAMIC 11-54-3557-0 FOR R2, R52

22520-0190 AC RECEP 10/15 AMP R/A SOLDER UL PJ3

22573-0070 HEADER 4WAY STR SIL STD PJ4

22573-0222 HEADER 2 WAY STR F/LOCK .156P PJ2

22573-0224 HEADER 4 WAY STR F/LOCK .156P PJ1

23185-0000 RES ZERO OHM R92

23207-4100 RES 100KJ 1W MF 250PPM R28, R55

23207-4220 RES 220KJ 1W MF 250PPM R25-26

23210-4150 RES 150KJ 2W MF 250PPM R1

23222-0470 RES 47R0J W33 MF FUSIBLE NFR25 R89

23222-1220 RES 220RJ W33 MF FUSIBLE NFR25 R86

23271-0019 RES 0R01J 2W MR R52

23274-0220 RES 100RJ 7W WW (STAND-OFF) R2

23274-0250 RES 1K0J 4W WW R6, R9, R23

23275-0010 RES 47R0J 3W MO R4, R12-13, R15-16, R18-19, R21-22

23385-3100 RES PS/H 10K CF 6MM VR1

23386-0010 VARISTOR V275LA20A VD1

23388-0010 THERMISTOR PTC TAG 90 DEG TH2

23424-0459 CAP 4N7 250V AC CER Y C5-6, C11-14

23424-0469 CAP 220PK 1KV CER P5 C17, C22-24, C63-64

23424-0472 CAP 2N2K 1KV CER P5/P7.5 C47, C54

23424-0476 CAP 4N7M 250V CER Y1/X1 P10 C69

23557-0506 CAP 10U 63V ELEC P2 C66

23557-0615 CAP 470U 16V RE3 P3.5 C59

23557-0665 CAP 2U2 50V ELEC RE2 P2 C21

23557-0666 CAP 47U 63V ELEC RE2 P3.5 C49

23557-0673 CAP 22U 35V ELEC RE2 P2 C44, C67

23557-0831 CAP 10U 400V ELEC P5 C81

23557-0841 CAP 47U 35V ELEC P2 C34

23557-0950 CAP 470U 400V ELEC S/I P10 C19-20

23620-0236 CAP 1N0K 100V P/E P5 C42-43

23620-0264 CAP 100NK400VP/E 368 SER P15 C37, C46

27

PCB ASSEMBLY – PFC (44115-3100) /continued...

Part Number Description Position

23620-0267 CAP 100NK 100V P/E P5 C35, C35B

23620-0268 CAP 220NK400VP/E 468 SER P15 C70

23684-0016 CAP 220NM 250VAC X2 P22.5 UL C68

23684-0023 CAP 2U2M 275VAC X2 P/P UL C1, C4, C7, C10, C15-16

23685-0013 CAP 330NK 160V/250V P/P P15 C18, C61-62

25031-0150 DIO UF4006 D20

25031-0200 DIO BYC10-600 D5-8, D19, D33

25115-0910 DIO 1N4007 B/R D9

25117-0040 DIO 40EPS08 D1-4

25601-0740 TRAN MOSFT NCHAN IRFPS37N50A Q1-6

27001-0060 OPTO-COUPLER SFH615A-3 IC10, IC13, IC15

27156-0030 IC TOP244Y IC5

27160-0013 IC V/REG 7815 IC7

27160-0032 IC V/REG 7818 IC6

31547-0750 SCREEN PFC CHOKE FOR L5-L7

PCB ASSEMBLY SM – PFC (44115-3101)

Part Number Description Position

22469-1000 TEST POINT SMT TP1

23105-0000 RES SM0805 ZERO OHM LK2

23105-0068 RES SM0805 6R80F W1 R94

23105-0100 RES SM0805 10R0F W1 R90

23105-0330 RES SM0805 33R0F W1 R5, R8, R11, R14, R17, R20

23105-0470 RES SM0805 47R0F W1 R27

23105-1220 RES SM0805 220RF W1 R3, R57, R95-96

23105-2100 RES SM0805 1K00F W1 R47, R56, R78

23105-2220 RES SM0805 2K20F W1 R71, R80, R82

23105-2330 RES SM0805 3K30F W1 R24, R43, R48, R50, R79, R91

23105-2470 RES SM0805 4K70F W1 R54, R58, R62-63, R74, R76-77

23105-3100 RES SM0805 10K0F W1 R31-33, R49, R64-65, R68, R72, R81, R85

23105-3220 RES SM0805 22K0F W1 R46, R75

23105-3270 RES SM0805 27K0F W1 R93

23105-3330 RES SM0805 33K0F W1 R37

23105-3360 RES SM0805 36K0F W1 R51

23105-3470 RES SM0805 47K0F W1 R61

23105-4100 RES SM0805 100KF W1 R99-104

28

PCB ASSEMBLY SM – PFC (44115-3101) /continued...

Part Number Description Position

23105-4180 RES SM0805 180KF W1 R59-60, R59B, R60B

23105-4220 RES SM0805 220KF W1 R40-42, R70, R41B, R42B

23105-4330 RES SM0805 330KF W1 R34-35, R38-39, R34B, R35B, R38B, R39B

23105-4360 RES SM0805 360KF W1 R36

23105-4430 RES SM0805 430KF W1 R45, R44B, R45B

23105-4470 RES SM0805 470KF W1 R29, R30, R29B, R30B

23105-4510 RES SM0805 510KF W1 R44

23105-4750 RES SM0805 750KF W1 R10

23105-5100 RES SM0805 1M00F W1 R66-67, R69, R73

23406-2474 CAP SM0805 470NK 16V CER X7R C55-56

23407-0471 CAP SM0805 470P CER NPO C41

23411-0104 CAP SM1206 100NK 50V CER X7R C36, C36B

23461-0015 CAP SM0805 10NK 50V CER X7R C65

23461-0200 CAP SM0805 2N2J 50V CER X7R C40

23461-0300 CAP SM0805 100NK 25V CER X7R C25-33, C38-39, C45, C48, C50-53,

C57-58, C60, C71-79

23559-3470 CAP SM 47U 16V AL ELEC C82

23559-5100 CAP SM 10U 35V AL ELEC C80

25021-0050 DIO SM BAV99 SWITCHING D11, D18, D24-32, D34

25115-1010 DIO SM US1J 1A 600V 75ns D10, D21

25115-1010 DIO SM US1J 1A 600V 75ns D36, D37

25132-0230 DIO SM ZEN 5V1 W35 D23

25132-0310 DIO SM ZEN 5V6 W35 D35

25132-0330 DIO SM ZEN 24V W35 D22

25132-0340 DIO SM ZEN 12V W35 D38

25377-1000 TRAN SM NPN BC849C Q8-11, Q13

27106-1110 IC SM LM358M DUAL OP AMP IC12

27106-1160 IC SM LM324M OP AMP IC8

27156-0180 IC SM TNY267G IC9

27160-1070 IC SM TL431 IC11

27168-1030 IC SM L4981AD IC4

27253-0150 IC SM MIC4427 IC1-3

35555-4600 PCB - PFC

29

PCB ASSEMBLY KEYBOARD (44115-3110)

Part Number Description Position

20661-0282 SPACER Rnd 3.7 ID x 3.2 L Nyl LCD FIXING

20661-0872 SPACER TOWER RND 4.8ODx8L FOR LED1-5

22224-0020 ENCODER ROT 24 POSITION SW1

22226-0101 KEYSWITCH - ALPS SKHHBW K1-20

22573-0048 HEADER 3WAY STR SIL STD/GOLD TP1-3

22573-0222 HEADER 2 WAY STR F/LOCK .156P PJ4

22573-0247 HEADER 2 WAY STR .1P F/LOCK PJ7

22573-0248 HEADER 3 WAY STR .1P F/LOCK PJ9-10

22575-0065 HEADER 20 WAY 2X10 STR SKELN PJ3

22575-0550 SKT 22W 1.0 FPC VERT PJ6

23377-4100 RES PS/H 100K CF 10MM VR1

25061-0201 LED - T1 ROUND(3mm) RED LED1-5

26100-0240 LCD 240 X 64 GRAPHICS BACKLIT LCD1

26100-0241 HOLDER FOR 26100-0240

28151-0010 BUZZER - 41.T70P015H BUZZ1

28502-0020 RESONATOR CERAMIC 12MHZ X1

PCB ASSEMBLY SM KEYBOARD (44115-3111)

Part Number Description Position

23105-0000 RES SM0805 ZERO OHM R4, R19, R21

23105-0047 RES SM0805 4R70F W1 R44

23105-0100 RES SM0805 10R0F W1 R32

23105-0560 RES SM0805 56R0F W1 R40

23105-1100 RES SM0805 100RF W1 R23

23105-1150 RES SM0805 150RF W1 R50-54

23105-2100 RES SM0805 1K00F W1 R1, R5-6, R9, R17, R22, R43, R45

23105-2220 RES SM0805 2K20F W1 R55

23105-3100 RES SM0805 10K0F W1 R24-31, R33-39, R41-42

23105-3150 RES SM0805 15K0F W1 R7

23105-3220 RES SM0805 22K0F W1 R2, R46

23105-3470 RES SM0805 47K0F W1 R10

23105-4100 RES SM0805 100KF W1 R8, R11-12

23105-4300 RES SM0805 300KF W1 R15

23105-4470 RES SM0805 470KF W1 R14

23105-5100 RES SM0805 1M00F W1 R13

23407-0220 CAP SM0805 22P CER NPO C13-14

30

PCB ASSEMBLY SM KEYBOARD (44115-3111) /continued...

Part Number Description Position

23411-0475 CAP SM1206 4U7K 16V CER X7R C1-3, C11-12

23461-0020 CAP SM0805 100NZ 50V CER Y5V C16-17, C20-25

23461-0334 CAP SM0805 330NK 25V CER X7R C6-10

23559-2221 CAP SM 220U 10V AL ELEC C18-19

23559-4101 CAP SM 100U 25V AL ELEC C4, C26-27

23595-0010 CAP SM-A 1U0M 16V TANT C5, C15

25021-1010 DIO SM BAS21 D5

25031-1030 DIO SM ZHCS500 D1-4

25377-1000 TRAN SM NPN BC849C Q2

25381-1020 TRAN SM NPN FZT651 60V 3A Q1

27106-1110 IC SM LM358M DUAL OP AMP IC7

27160-1010 IC SM V/REG LM1117 ADJ IC3

27160-1030 IC SM V/REG LM1117-3V3 IC4

27161-2030 IC SM V/REF ZRC250 2.5V 2% IC1

27239-0140 IC SM 74HC14 IC5

27239-5740 IC SM 74HC574 IC6

27250-2230 IC SM MCU LPC2103 IC2

35555-4760 PCB – KEYBOARD

PCB ASSEMBLY R/TERMINAL (44115-3190)

Part Number Description Position

23557-0731 CAP 100U 100V ELEC LOW ESR C1

23620-0267 CAP 100NK 100V P/E P5 C2

23620-0268 CAP 220NK400VP/E 468 SER P15 C3

35555-4980 PCB REAR TERMINAL

PCB ASSEMBLY INTERFACE (44115-3150)

Part Number Description Position

22573-0248 HEADER 3 WAY STR .1P F/LOCK PJ3

22574-0450 SKT 9W R/A D-TYPE (CLIP IN) PJ2

22574-0495 SKT - USB TYPE B - PCB MTG PJ1

22575-0065 HEADER 20 WAY 2X10 STR SKELN PJ4-5

35358-0580 EARTHING SPRING USB SP1

31

PCB ASSEMBLY SM INTRFACE (44115-3151)

Part Number Description Position

23105-0330 RES SM0805 33R0F W1 R3-4

23105-2100 RES SM0805 1K00F W1 R15, R19, R21

23105-2150 RES SM0805 1K50F W1 R22

23105-2220 RES SM0805 2K20F W1 R20

23105-3100 RES SM0805 10K0F W1 R1, R5-7, R10-14, R16-18, R25

23105-3470 RES SM0805 47K0F W1 R8-9

23105-4100 RES SM0805 100KF W1 R2, R23

23407-0180 CAP SM0805 18P CER NPO C3, C11

23461-0020 CAP SM0805 100NZ 50V CER Y5V C2, C9-10, C14

23461-0500 CAP SM0805 4U7 6V3 CER X5R C4-6, C15

23559-2221 CAP SM 220U 10V AL ELEC C12-13

23595-0010 CAP SM-A 1U0M 16V TANT C1

25021-1010 DIO SM BAS21 D1

25061-0304 LED SM0805 RED LED1

25377-1000 TRAN SM NPN BC849C Q2

27160-1030 IC SM V/REG LM1117-3V3 IC3

27162-1060 IC SM TPS60401 IC6

27239-0140 IC SM 74HC14 IC4

27250-2210 IC SM MCU LPC2148 IC5

27253-0050 IC SM 14C88 IC2

27253-0060 IC SM 14C89 IC1

23407-0220 CAP SM0805 22P CER NPO C7-8

25340-1000 TRAN SM PNP BC859C Q1

23411-0475 CAP SM1206 4U7K 16V CER X7R C16

23105-0000 RES SM0805 ZERO OHM R24

28500-2040 XTAL SM 12MHZ 30/50PPM 16PF XTL1

35555-4880 PCB - INTERFACE

MECHANICAL PARTS

Part Number Description Position

10232-0306 SLEEVE 50 X 25MML BLACK FOR POWER OUTPUT WIRES

10232-0360 TUBING PVC CLEAR 9.5ID

10233-0106 TUBING H/S 9.5MM BORE CLEAR

10366-0610 TAPE ALUMINIUM FOIL

20500-0010 FAN GUARD 80MM

20620-0010 CLIP - ENCODER KNOB

20662-0570 FOOT SELF ADHESIVE GREY FRONT FEET

32

MECHANICAL PARTS /continued...

Part Number Description Position

20662-9101 INSTRUMENT FOOT BACK FEET

22040-0030 FERRITE SLEEVE APPX 8/16/14L SAFETY EARTH

PFC TO POWER AUX
MAINS TO FRONT PANEL (2)
PFC TO KEYBOARD
POWER TO CONTROL AUX

22040-0090 FERRITE SLEEVE 31x19IDx16L POWER TO FRONT TERMINALS

FRONT TO REAR TERMINALS

22219-0140 SWITCH ROCKER DPDT 16A 250V

22454-0060 RECEPT RED FEMALE 4.8x0.8MM POWER TO PFC WIRES

22491-0270 MAINS LD 2MST IEC SKT/EURO PL

22491-0280 MAINS LD 2M ST IEC/UK PLUG 13A

22571-0741 PIN ANTI-ROTATION (TP/44&244L)

22571-1030 TERMINAL TP60 BLACK/BLACK 25MM F/PANEL, R/PANEL

22571-1040 TERMINAL TP60 RED/BLACK 25MM F/PANEL, R/PANEL

22571-1100 TERMINAL PSU SAFTY GREY/GREY F/PANEL

22575-0077 SKT 2 WAY IDT .1P FOR INTERNAL FAN

22575-0078 SKT 3 WAY IDT .1P PJ5 CNTL TO PJ9 KEYBOARD

PJ10 KEYBOARD TO I/F

22575-0202 SKT 2W .156 20AWG Yellow IDT PJ4 ON KEYBOARD

22575-0204 SKT 4W .156 20AWG Yellow IDT PFC TO POWER

22575-0210 SKT 10W.156 20AWG Yellow IDT PJ5 POWER, PJ10 CNTL

28522-0030 FAN 80MM 24VDC 3000RPM REAR PANEL (2), INTERNAL.

31512-1000 BRACKET WIRE SUPPORT

31512-1020 BRACKET FAN SUPPORT FOR INTERNAL FAN

31711-0190 BEZEL

33143-0290 FOOT - TILT - HOUSING

33143-0300 FOOT - TILT - SUPPORT

33331-8850 FRONT PANEL

33331-8860 REAR PANEL

33331-8870 OVERLAY FRONT PANEL

33537-1130 CASE LOWER

33537-1140

37113-2090 KEYCAP 8 x 4.5MM LIGHT GREY F/R

37151-0430 KNOB ENCODER LIGHT GREY F/R

43171-2600 CONN ASSEMBLY 16WPWR/CNTL

48511-1030 INSTRUCTION MANUAL

48511-1040CD CD INSTRUCTION/DRIVERS

CASE UPPER

33

FIXINGS & FASTNERS

Part Number Description Position

20010-0254 RIVET SNAP-LOCK 4.1D X 5.5T INTERNAL FAN FIXING

20010-0255 RIVET SNAP-LOCK 4.1Dx7.5T FAN MOUNTING REAR PANEL

20010-0257 RIVET SNAPLOCK 3.6Dx2.2-3.1T R.PANEL/CHASSIS

20030-0271 WASHER M4x12x1 ZPST EARTH TERMINAL, EARTH

20037-0301 WASHER M3 SHK/PROOF I/T ZPST CHASSIS/FRONT PANEL

20037-0304 WASHER M4 SHK/PROOF I/T ZPST FRONT FEET

REAR SAFETY EARTH
REAR TERMINAL PCB FIXING

20037-0305 WASHER 5/16in.SHK/PRF I/T ZPST FOR FRONT PANEL EARTH

20038-9502 WASHER M4 SPRING REAR TERMINAL PCB FIXING

20063-0010 SCREW No.6 x 3/8 NIB HDPZ ST/AB CASE

20065-0070 SCREW M2.5 x 6 PLAS PNHDPZ BEZEL FIXING

20210-0101 NUT M3 ZPST CHASSIS/FRONT PANEL

20210-0110 NUT M4 BARB SAFETY EARTH

20210-0111 NUT M4 SERRATED FLANGE EARTH TERMINAL

20210-0130 NUT M6 BARB ZPST POWER PCB OUTPUT

20213-0040 CAPTIVE NUT SPIRE No.6 CASE UPPER/CHASSIS

REAR PANEL

20234-0016 SCREW M4 x 16 PNHDPZ ZPST BACK FEET

20234-0023 SCREW M4 x 8 PNHDPZ ZPST REAR TERMINAL PCB FIXING

20234-0028 SCREW M4 x 10 PNHDPZ ZPST FRONT FEET

20234-0100 SCREW M3 x 6PNHDPZ C/W EXT

SH/PROOF

KEYBOARD/CONTROL PCB
POWER PCB/CHASSIS
PFC PCB/CHASSIS
WIRE SUPPORT BRACKET
CHASSIS/REAR PANEL
CHASSIS/FRONT PANEL

20236-0010 SCREW M4 x 12 TAMPERPROOF SAFETY EARTH

22443-0002 GROMMET - 3109A WIRE SUPPORT BRACKET

22571-1101 WASHER ALUMINIUM EARTH TERMINAL FOR FRONT PANEL EARTH

34

Component Layouts

QPX1200 KEYBOARD PCB

QPX1200 CONTROL PCB

35

INTERFACE ASSEMBLY

36

QPX1200 PFC PCB COMPONENT LAYOUT

QPX1200 POWER PCB COMPONENT LAYOUT

Circuit Diagrams

37

QPX1200 PFC PCB – Sheet 1 of 2

QPX1200 PFC PCB – Sheet 2 of 2

QPX1200 POWER PCB – Sheet 1 of 3

QPX1200 POWER PCB – Sheet 2 of 3

QPX1200 POWER PCB – Sheet 3 of 3

QPX1200 CONTROL PCB

QPX1200 KEYBOARD PCB

QPX1200 INTERFACE PCB

Thurlby Thandar Instruments Ltd

Glebe Road, Huntingdon, Cambridgeshire PE29 7DR, England

Telephone: [phone] Fax: [phone]

e mail: [e-mail]

International website: www.tti-test.com UK website: www.tti.co.uk