Brother P-touch PT-210E User manual

P-touch
SERVICE MANUAL
MODEL: PT-210E (For Europe)

P-touch
SERVICE MANUAL
MODEL: PT-210E (For Europe)

Copyright Brother 1998
All rights reserved.
No part of this publication may be reproduced in any
form or by any means without permission in writing from
the publisher.
Specifications are subject to change without notice.

PREFACE
This publication is a service manual covering the specifications, theory of operation,
disassembly/
reassembly procedure, and troubleshooting of the Brother PT-210E. It is intended for service
personnel and other concerned persons to accurately and quickly provide after-sale service for
our PT-210E.
To perform appropriate maintenance so that the machine is always in best condition for the
customer, the service personnel must adequately understand and apply this manual.
This manual is made up of three chapters.
CHAPTER I.SPECIFICATIONS
CHAPTER II.MECHANISMS
CHAPTER III.ELECTRONICS
Note: This service manual of the P-touch (PT-210E) describes only different parts from the
each part of the service manual (No. 5V2065BE0) which was published before. We
omit the same parts with that of PT-220 and describe the effect of it in contents.
When you find the omitted parts, please refer to the service manual of that model.

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SERVICE MANUAL
1
P-touch PT-210E (For Europe)
Mechanical Part
CONTENTS
CHAPTER I SPECIFICATIONS.................................................Refer to PT-220 (P. I-1)
1.1MECHANICAL SPECIFICATIONS................................................................Refer to PT-220 (P. I-1)
1.1.1 External Appearance.......................................................................Refer to PT-220 (P. I-1)
1.1.2 Keyboard.........................................................................................Refer to PT-220 (P. I-1)
1.1.3 Display............................................................................................Refer to PT-220 (P. I-2)
1.1.4 Printing Mechanism.........................................................................Refer to PT-220 (P. I-2)
1.1.5 Tape Cassette.................................................................................Refer to PT-220 (P. I-3)
1.1.6 Tape Cutter.....................................................................................Refer to PT-220 (P. I-3)
Key Arrangement............................................................................................................I-1
1.2ELECTRONICS SPECIFICATIONS..............................................................................................I-2
1.2.1 Character Generator.......................................................................................................I-2
1.2.2 Power Supply..................................................................................................................I-2
1.3SPECIAL KEY..............................................................................................Refer to PT-220 (P. I-6)
1.3.1 Format............................................................................................Refer to PT-220 (P. I-6)
1.3.2 Demonstration Print........................................................................Refer to PT-220 (P. I-6)

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SERVICE MANUAL
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CHAPTER II MECHANISMS.....................................................Refer to PT-220 (P. II-1)
2.1 THEORY OF OPERATION..........................................................................Refer to PT-220 (P. II-1)
2.1.1 Print Mechanism ............................................................................Refer to PT-220 (P. II-1)
2.1.2 Platen Roller, (Tape Feed) Sub Roller Setting
& Retracting Mechanism ................................................................Refer to PT-220 (P. II-2)
2.1.3 Tape & Ribbon Feed Mechanism ...................................................Refer to PT-220 (P. II-4)
2.1.4 Tape Cutter Mechanism.................................................................Refer to PT-220 (P. II-6)
2.1.5 Interlock Mechanism of the Roller Holder ASSY
and Cassette Cover........................................................................Refer to PT-220 (P. II-7)
2.2 DISASSEMBLY & REASSEMBLY ...............................................................Refer to PT-220 (P. II-8)
2.2.1 Disassembly Procedure..................................................................Refer to PT-220 (P. II-8)
[1] Removing the cassette cover,
the tape cassette and the batteries.........................................Refer to PT-220 (P. II-8)
[2] Removing the cassette spring and pin....................................Refer to PT-220 (P. II-9)
[3] Removing the bottom cover ...................................................Refer to PT-220 (P. II-9)
[4] Removing the frame ASSY ..................................................Refer to PT-220 (P. II-11)
[5] Removing the battery terminal support
and releasing the battery terminals.......................................Refer to PT-220 (P. II-14)
[6] Removing the sub PCB........................................................Refer to PT-220 (P. II-16)
[7] Removing the main PCB and the rubber 52 key...................Refer to PT-220 (P. II-17)
2.2.2 Reassembly Procedure ................................................................Refer to PT-220 (P. II-18)
[1] Installing the rubber 52 key and main PCB...........................Refer to PT-220 (P. II-18)
[2] Installing the sub PCB..........................................................Refer to PT-220 (P. II-19)
[3] Installing the battery terminals and battery terminal support .Refer to PT-220 (P. II-20)
[4] Mounting on the Bottom Cover of the Frame ASSY..............Refer to PT-220 (P. II-23)
[5] Installing the bottom cover ...................................................Refer to PT-220 (P. II-27)
[6] Mounting the cassette spring and pin....................................Refer to PT-220 (P. II-29)
[7] Installing the tape cassette, the batteries,
and the cassette cover .........................................................Refer to PT-220 (P. II-30)
[8] Demonstration print and final check......................................Refer to PT-220 (P. II-32)
2.3 TROUBLESHOOTING...............................................................................Refer to PT-220 (P. II-34)
2.3.1 Precautions..................................................................................Refer to PT-220 (P. II-34)
2.3.2 After Repairing.............................................................................Refer to PT-220 (P. II-34)
2.3.3 Troubleshooting Flows .................................................................Refer to PT-220 (P. II-35)
[1] Tape feeding failure .............................................................Refer to PT-220 (P. II-35)
[2] Printing failure......................................................................Refer to PT-220 (P. II-37)
[3] Powering failure (Nothing appears on the LCD)....................Refer to PT-220 (P. II-39)

P-touch
SERVICE MANUAL Specifications
I- 1
Fig. 1.1-2 Key Arrangement

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Specifications SERVICE MANUAL
I- 2
1.2 ELECTRONICS SPECIFICATIONS
1.2.1 Character Generator
(1) Internal characters U.K./ FRA/ BEL/ GER 240
(2) Internal font HELSINKI
(3) Print buffer capacity 99 characters
(4) Phrase memory capacity 300 characters
1.2.2 Power Supply
(1) Power supply Driven by 6 batteries
Optional AC line adapter (9.5VDC, 1.3A) available
(2) Battery type 6 alkaline batteries (LR6)
(3) Service life of batteries Will last through one tape cassette, and then some.
(at room temperature and normal humidity)
(4) Automatic power off Yes
(If the machine remains unused for approx. 5
minutes, it automatically powers itself off.)
(5) Battery indication
1) Battery weak detection
When using dry cell batteries, if the battery voltage is detected to be 6.4 V or
less at the A/D terminals of the CPU twice in succession during printing, the
“battery weak” status comes into effect.
2) Battery empty detection
When using dry cell batteries, if the battery voltage is detected to be 6.2 V or
less at the A/D terminals of the CPU twice in succession during printing, the
“battery empty” status comes into effect.

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SERVICE MANUAL
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P-touch PT-210E (For Europe)
Electronic Part
CONTENTS
CHAPTER III ELECTRONICS..................................................Refer to PT-220 (P. III-1)
3.1OVERVIEW................................................................................................Refer to PT-220 (P. III-1)
3.1.1 Configuration of the Electronic Part...............................................Refer to PT-220 (P. III-1)
3.1.2 Main PCB......................................................................................Refer to PT-220 (P. III-1)
3.1.3 Sub PCB.......................................................................................Refer to PT-220 (P. III-1)
3.1.4 Motor............................................................................................Refer to PT-220 (P. III-1)
3.1.5 Thermal Head...............................................................................Refer to PT-220 (P. III-2)
3.2MAIN PCB..................................................................................................Refer to PT-220 (P. III-3)
3.2.1 Block Diagram...............................................................................Refer to PT-220 (P. III-3)
Block Diagram of Main PCB..........................................................................................III-1
3.2.2 CPU..............................................................................................................................III-2
3.2.3 Key Contacts Matrix......................................................................................................III-2
[1] Key contacts matrix...............................................................................................III-2
[2] Solder points.........................................................................................................III-3
3.2.4 Power ON/OFF Circuit and Power Saving Circuit..........................................................III-4
[1] Power ON/OFF circuit...........................................................................................III-4
[2] Power saving circuit..............................................................Refer to PT-220 (P. III-9)
3.2.5 Motor Control Circuit...................................................................Refer to PT-220 (P. III-10)
3.2.6 Thermal Head Drive Circuit.........................................................Refer to PT-220 (P. III-11)
3.2.7 Voltage Detection Circuit and Temperature Sensor circuit.............................................III-5
[1] Voltage detection circuit........................................................................................III-5
[2] Ambient temperature sensor circuit.....................................Refer to PT-220 (P. III-13)
3.2.8 Oscillation Circuit..........................................................................................................III-6
3.2.9 Reset Circuit.................................................................................................................III-6
3.2.10 Power Supply Circuit...................................................................Refer to PT-220 (P. III-15)
3.2.11 Cassette Sensor Circuit...............................................................Refer to PT-220 (P. III-16)

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3.3TROUBLESHOOTING..............................................................................Refer to PT-220 (P. III-17)
3.3.1 Precautions.................................................................................Refer to PT-220 (P. III-17)
3.3.2 After Repairing............................................................................Refer to PT-220 (P. III-17)
3.3.3 Troubleshooting Flows................................................................Refer to PT-220 (P. III-18)
[1] Tape feeding failure............................................................Refer to PT-220 (P. III-18)
[2] Printing failure.....................................................................Refer to PT-220 (P. III-18)
[3] Powering failure (Nothing appears on the LCD.)..................Refer to PT-220 (P. III-19)
[4] Abnormal LCD indication.....................................................Refer to PT-220 (P. III-20)
[5] No key entry possible..........................................................Refer to PT-220 (P. III-21)
[6] Tape cassette type not identified.........................................Refer to PT-220 (P. III-21)
3.4 APPENDIX.................................................................................................Refer to PT-220 (P. III-22)
Sub PCB Circuit Diagram..........................................................................Refer to PT-220 (P. III-22)
Main PCB Circuit Diagram..........................................................................................................III-7

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SERVICE MANUAL Electronics
III - 1
Fig. 3.2-1 Block Diagram of Main PCB

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Electronics SERVICE MANUAL
III - 2
3.2.2 CPU
The CPU (MN101C01D) is an 8bit microprocessor produced by the CMOS silicon gate
process, which integrates a 64 kilobyte ROM and a 2048 byte RAM.
3.2.3 Key Contacts Matrix
[1] Key contacts matrix
On the main PCB is a key contacts matrix that is a set of 51 carbon-printed key contact
patterns. Each contact pattern has a pair of electrodes.
The rubber 51 key is made of high-impedance silicon rubber. As shown in Fig. 3.2-2,
each key on the rubber 51 key consists of a key top, rubber spring, and conductive
paint which functions as a switching element.
If a particular key is pressed, the conductive paint of the key short-circuits the paired
electrodes carbon-printed on the main PCB.
Fig. 3.2-3 shows a timing chart and waveforms of key scanning by the CPU. Ports P30
through P36 on the CPU produce a series of key scanning pulses. Every scanning
pulse is in low impedance for 1 ms while active and in high impedance while inactive.
Ports P40 through P47 act as input ports which receive key statuses.
The CPU scans the key contacts matrix every 10 ms. If the CPU reads the same data
at an input port two successive times, it interprets the state as the key being pressed; if
the CPU reads the same data six successive times, it interprets the state as the key
being released. The input mode of this keying system is 2-key roll-over and 3-key lock-
out.
Fig. 3.2-2 Detailed Mechanism of a key

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SERVICE MANUAL Electronics
III - 3
[2] Solder points
Fig. 3.2-4 shows a circuit diagram relating to the keyboard and solder points. Solder
points 1 through 5 are connected to satisfy the specification of PT-210E.
Solder points A through H are reserved for future use for the thermal head ranking.
The CPU reads the solder point status once during powering-on to confirm the
specification.
Fig. 3.2-4 Keyboard and Solder Points

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Electronics SERVICE MANUAL
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3.2.4 Power ON/OFF Circuit and Power Saving Circuit
[1] Power ON/OFF circuit
Fig. 3.2-5 shows a circuit diagram of the power ON/OFF key. The CPU processes the
ON/OFF key state in a sequence quite different from other keys although it is on the
keyboard.
Fig. 3.2-5 Power ON/OFF Circuit
If you press the ON/OFF key, the signal IRQ0 interrupts the CPU on P21. Then, the
CPU switches P21 to the input port and enters the process which eliminates the
chattering part in the signal IRQ0.
Powering-on sequence (See Fig. 3.2-6.)
1) Interrupted by IRQ0, the CPU starts the chattering elimination program
module.
2) If P21 is Low for 10 ms, the CPU recognizes the ON/OFF key as being
pressed and then transfers the control to the main program module. If P21 is
High, the CPU interprets the input as a noise and waits for the next IRQ0.
3) Even if releasing the ON/OFF key makes a chattering noise so as to generate
IRQ0, the CPU interprets the signal as a noise for 10 ms (between ƒand „)
and then transfers the control to the main program module.
Fig. 3.2-6 Powering-on and-off Sequence

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SERVICE MANUAL Electronics
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3.2.7 Voltage Detection Circuit and Temperature Sensor circuit
Fig. 3.2-12 and Fig. 3.2-13 (See next page) show the voltage detection circuit and the
ambient sensor circuit, which are composed of a resistor combination.
[1] Voltage detection circuit
This circuit, which is composed of divider resistors R10 and R11, steps down the power
source VAD fed from batteries or the AC adapter output and feeds the output to the
A/D input port PA1 on the CPU. According to the drive source voltage, the CPU
determines the optimum head drive power.
At power ON:
• If the voltage level of the VAD rises over approx. 15.4V, the CPU immediately shuts
down the power.
• If the voltage level of the VAD drops below approx. 6.9V, the CPU immediately shuts
down the power.
During non-printing:
If the voltage level of VAD drops below approx. 6.9V, the CPU immediately shuts down
the power.
During printing:
• If the voltage level of the VAD rises over approx. 15.4V, the CPU displays message
A below and immediately shuts down the power.
• If it drops even more, below approx. 6.4V, the CPU displays the message B below
to warn you of a low battery after completion of printing.
• If it drops even more, below approx. 6.2V, the CPU interrupts the printing and
displays the message C below to warn you of a very low battery.
• If it drops below approx. 6.0V, the CPU immediately shuts down the power.
Fig. 3.2-12 Voltage Detection Circuit

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Electronics SERVICE MANUAL
III - 6
3.2.8 Oscillation Circuit
Fig. 3.2-14 shows the oscillation circuit.
This circuit contains an oscillator and generates an oscillation at 20 MHz which act as
the CPU basic clock. The CPU divides this into half (10 MHz) to synchronize its
internal operations.
Fig. 3.2-14 Oscillation Circuit
3.2.9 Reset Circuit
Fig. 3.2-15 shows the reset circuit. If the +5BV drops abnormally, this circuit prevents
the CPU from operating erroneously.
Fig. 3.2-15 Reset Circuit

III - 7

June, ’98
5V2072BE0
Printed in Japan