Epson QX10 Owner's Manual

TECHNICAL MANUAL

TROUBLESHOOTING

EPSON

08290002-0

TECHNICAL

MANUAL

TROUBLESHOOTING

QX~O

This Technical Manual provides technical information on the structure, maintenance, and repairs
the QX-10.
For

the

details
ation).
Major technical modifications, if made
Technical Manual should be revised accordingly. The. details
withOl,!t notice.
All the information given in the Manual concerns the QX-1

All rights reserved. No part

mitted,
out the prior written permission by

in

of

the operation, refer

of

this publication may be reproduced, stored

any form or by any means, electronic, mechanical, photocopying, recording

to

the Technical Manual

in

the future, will be notified through Service Bulletins, and the

EPSON

CORPORATION.

of

QX-1

of

0

to

others.

Copyright ©

0 (Principles

the Manual are subject

in

a retrieval system,

1983

by

EPSON CORPORATION

of

Hardware Oper-

to

or

or

otherwise,

change

trans-

with-

Nagano, Japan

of

CONTENTS

CHAPTER 1 GENERAL
CHAPTER 2
CHAPTER 3
CHAPTER 4 REPAIRS
CHAPTER 5 TROUBLESHOOTING

DiSASSEMBLY
ADJUSTMENT

AND

AND

REASSEMBLY

MAINTENANCE

CHAPTER

1

GENERAL

CONTENTS

1.1 Features.......................................... ................ ................................................. 1-1

1.2

Hardware

1.2.1 General ................................................................................................... 1-1

1.2.2

1.3

Specifications

1.3.1 External Dimensions and

1.3.2 Environmental Conditions ....................................................................

Configuration................................................................................ 1-1

Hardware ............................................................................................... 1-1

..................................................................................................

Weight

.........................................................

1-2
1-2
1-2

1.1

Features

The OX-1 0 is an all business computer system.
256

KB

maximum,
full-graphic
The standard configuration includes a programmable timer, Centronics-compatible
RS-232C interface, C-MOS RAM backed up
has five card slots
Optional cards available include character generators
er interface,

1.2

Hardware

1.2.1 General
The OX-1 0 is composed of three units:
The main system unit,
board,
stallation
The keyboard
be transmitted in any direction.
The standard

1.2.2

Hardware

CRT

color

power

of

optional cards.

two

floppy disk drivers

display

with

which

permit installation

CRT

interface, and pulse transformer interface.

configuration

the

heart

supply,

unit

monitor

two

5-1/4"

is connected

unit

is a

a resolution

of

floppy

to

12"

of

the

the

QX-10

disk

the main system

high resolution green

It

consists

of

double-sided, double-density,

640

by

400

by

battery, clock and calendar, and separate keyboard.

of

optional cards

main system unit,

system, includes the main

drives developed

unit

of a Z80A-compatible

dots.

as

required.

of

varying fonts, IEEE-488 interface, optical fib-

the

keyboard unit, and

by

Epson, and five slots

with

a curled cord

monitor

capable

5-1/4"

circuit

through

of

displaying

CPU,

a memory

disks, and a

printer

the

board, sub

which

interface,

monitor

permitting

signals may

bit

images.

of

12"

It

unit.

circuit

in-

Main system

CPU
Memory

Clock
Speaker
Interfaces

DMA
Interrupt levels
Counter/timer
FDD

Card slots
Monitor

Keyboard

.uPD780AC-1
RAM :
VIDEO RAM :
C-MOS RAM : 2

EPROM :
C-MOS real-time clock (backed up by battery)
Permanent magnet speaker
Printer interface (Centronics-compatible)

RS-232C communications interface
7 channels

15
6 channels
5-1/4"
320

KB x 2 drives

48

TPI, double sided & double density

FDD

(Z80A

x 2

compatible, 4 MHz)

256

KB

(maximum

128

KB

(maximum on

KB

(standard, backed up by battery)

2/4/8

K8

(for

IPL)

on

main board)
CRT

board)

5

1

2"

green

monitor

640 x 400
ASCII, HASCI

dots

1-1

1.3

Specifications

1.3.1 External

(1) External dimensions

(2)

1.3.2

Environmental

(1) Temperature .................... during operation

(2) Humidity ........................... during operation

(3) Resistance

(4) Resistance

Dimensions

Main system unit ca.
Green

monitor

Keyboard

Optional card
Weight:

unit

to

to

and

Weight

unit ca.

ca.

approx. 1 Skg

Conditions

storage

storage

shock ........ during operation

storage

vibration .... during operation

storage

(W)

50S

312

50S

(510)

2S0

(0)

x

340

x

340

x

224

x

80

(H)

x

103

x

270

48

x

:

5°C

to

:

-30°C

:

20 -80%
10 -90%

:
: max. 1
: max. 5

0.25

: max.
: max. 3

(mm)
(mm)
(mm)

(mm)

40°C

to

70°C

(no condensation)
(no condensation)

G,

1 msec

G,

1 msec

G,

5-50

Hz

G,

5-50Hz

MainSY~

Greeninitor

unit

Fig 1-1

Hardware

configuration

1-2

of

QX-10

Q10GMS

Board

U9h8

CRT

AC

IN

Q10PS

board

Fig

,uP0765

(Channel A)

MPD7210

(Channel

JLPD8255

1-2

Block diagram of main component

B)

~

FOO

(SO-321 )

Keyboard

RS-232C

Printer

(centronics type)

Open card

1-3

(A)

Q10S

SYM

board

This is a main control board including

CPU,

compatible

with

Z80A,

Z80A

family

LSI

and main memory.

Name

CPU

DMA

controller

Interrupt controller

Interval

timer

Serial controller

Printer controller

Real

time clock

Floppy

disk

controller

Model

.uPD780C

8237A

8259AC

8253C

7201C

8255AC

46818P

765AC

Q'ty

CPU

1

2

2

(4MHz) compatible

Provided
tor

Controls

with

and options.

the

total

interrupt priority
interrupt including PWD output keyboard inter­rupt.

2

Controls

the

boud rate
RS-232C.

1 Allocates channel a

RS-232C, and controls serial data transfer
CPU.

1

1

1

Provided
interface

Provided

Interface

with
with

with

with

an
printer

clock

FOO

Function

with

Z80A.

of

7 channels

of

to

the

8-bit

parallel port.

conformable

keyboard

for

of

total

clock

keyboard and B

Acts

to

and calendar functions.

(SO-321 )

FDD,

moni-

15

levels

and

to

with

as an

Centronix.

I/O selector

Main memory

P-ROM

C-MOS RAM

LS154

416/4164

2716/32/

1 Accesses each

low

order address (A2

Dynamic RAM is used.

8

Provided

32

1 Stores IPL programs.

64

449

1

Protects

an

NiCd battery.)

Table 1-1 Primary configuration

I/O

point

with

4 banks maximum.

the

data on

of

Q1

0 SYM

by decoding the

,...

A5)

of

CPU.

power

failure. (Backed up by

4-bit

1-4

Fig.

1-3

1 ,uPD780C

2

8237

3

8259AC

4

8253C

5

7201 C (Multi-protcol Serial Controller)

6

8255AC

7

46818P

8

765AC

9

LS 1 54

10

416/4164

11

2716/32/04

12

449

(Z80A

A (Programmable

compatible

DMA

CPU)

Controller)

(Programmable Interrupt Controller)

(Programmable Interval Timer)

(Programmable peripheral Interface)

(Real-time clock plus RAM)

(Programmable Floppy Disk Controller)

(I/O Selector)

(D-RAM)

(P-ROM

for

IPL)

(C-MOS RAM)

1-5

(B)

Q10

GMS

board

includes

graphic

display

controller

The board includes graphic display controller ,uPD7220 and V-RAM, and controls display
monitor.

of

the green

Name

Graphic display
controller

Video RAM

Character generator

7220

416/4164

2732/64

Table

Model

1-2

Q'ty

Primary configuration

1

A display controller
magnifying functions.

16

Dynamic RAM is used.

1

ROM

storing display

play unit.

of

Q1

0 GMS

Function

with

high speed

fonts

to

be sent

drawing

to

the

and

dis-

1-4

Fig.

1

7220

(Graphic Display Controller)
2 V-RAM
3

P-ROM (Character Generator)

(16/64 k bit

1-6

dynamic RAM)

(e)

Q10

PS

board
This is a
It

power

supply

accommodates

to

Specifications
(1)

Input voltage:

(2)

Frequency:
(3) Power cosumption:
(4)

Input serge current:
(5) Leak current:
(6)

Insulation strength:

(7)

Insultation

resistance~

(8) Output Voltage:

unit

power

for

the

OX-1

0 system and a

supplies

of 1 OOV

and

100V-10% -120V+10%
200V
50/60

channel

Hz

220V -10%

Approx.75W
30A

for

20

ms maximum

1 rnA maximum
1

OOV

channel Can

and case

200V

channel

Can

supply and case

10

M.Q

for

500V

switching

200V

levels by

withstand

for

withstand

DC

minimum.

regulator

switching

'"

240V + 10%

1 kV applied between

with

a flyback transformer.

jumper wire J

AC

1 minute.

1 .25 kV applied between AC

for

1 minute.

1.

power

power

supply

Output
voltage

+5
+12(C)
+12(F)
+12(L)

-12

Limits of output

voltage current

5.0

'"

5.1

V

,....

12.4

11.6

V

11.4 -12.6V
11 -13V

-11

--13V
Table

1-3

Standard

3.6A
O.9A

1.2A
a.45A
a.a2A

USE

logic circuit

green

monitor

floppy

disk

drive

keyboard, RS-232C

D-RAM, RS-232C

Fig.

1-5

1-7

(D) CRT

Fig.
The

flection.

display

1-6

CRT

unit

shows the standard green

is characterized by high resolution

monitor

unit

of

of

640 x 400

OX-1

O.

dots

and non-glare coating, preventing re-

1

CRT
2 Anode cap
3

Deflection yoke
4 Flyback transformer
5

CRT

drive unit

(DY)

(FBT)

(CDU)

1) Pin

Definition

Pin

No. Function

1 Video

2

3

4 Power supply + 12 V

5

6

7

8

(E)

Frame ground

(7) Ground (power, hor.)

(3)

Horizontal sync

(5) Ground (power, hor.)

Fig.

1-6

signal
Vertical synchronizing signal
Horizontal synchronizing signal

DC

Grounding (power supply, horizontal)

1-4

vertical)

(6) Ground (video, vert.)

(1) Video

(4)

+12

signal

VDC

Grounding (video
Grounding (power supply, horizontal)
Frame grounding

Table

Fig-

1-7

1-8

2)

Input

Conditions

(1) Video signal:

(2)

Video input impedance:

(3)

Horizontal driving signal:

.

(4)

Horizontal input impedance:

(5)

Vertical driving signal:

(6)

Vertical input impedance:

3)

Input

signal

timing

(a) Horizontal driving signal

19.3

kHz

--------

--

..

-----

0

Fig 1

8

300

a min.

TTL (positive)
l:

0 ­500amin.
TTL (positive)

l:

0 -

3.0

kamin.

0,8

0.8

40

V

V

pF

max.

H:

2.4 - 5.5 V .

H:2.4 -5.5V

~nt-----\((~

I I »

-;

t--

1.44)AS

51.84.uS

5.0V

4.0V

--OV

---In"'---_

Full Bright
Half Bright

Dark

Video signal

(b) Vertical driving signal

45.8

Hz

Video signal

(c)

Video signal

13.44.u

____

~Il~----

--l

I-

0.83 mS

1.09 mS

Fig. 1

__

Fig.

Fig.

38.40.u

=9

~({~------~rl~------

21.83 mS

20.74mS

1-10

Dot clock = 16.667 MHz

1-11

1-9

(El

Keyboard

of

The keyboard
These

two

Keyboard data transfer is
from the main

Data transfer is made
BPS.

QX-1 0 is available in ASCII type and HASCI type, according

types are almost the same in hardware.

CPU.

to

applications.

controlled by the

with

the main system unit in the start-stop turning system at the rate

CPU

,uPD8049 used as a keyboard controller separately

of

1200

Pin

Definition

Pin No.

1
2

3

4
5
6

7

8

Note: The direction

Signal Direction

OUT
OUT
OUT

IN

-

-

-

-

of

signal

is

as viewed from the

Fig

1-12

1 Keyboard controller (,uPD8049)

2 Key scan signal decoder (LS145)

Description

Q1

OSYM board

Table

1-5'

2

of

Signal

Received data

Clock

(1200

BPS)

+12

V

Transmitted data

Ground
Ground
Ground
Ground

3

Fig.

E 6

1-13

Pin

1-10

locations

(F)

Floppy

Double sided, double density type
below:
SO-321 produces an ultra

1)
In order

2)
to

two

Disk

Drive

SO-321

to

miniaturize the circuit board and get high reliability,

lSls.

thin

of

5-1/4"

structure

of

1/2 -1/3

floppy

disk drive SO-321 has the features

the

convertional models.

most

of

the control circuit is integrated

as

described

Fig.

1-14

1

Head pad

2

VCM

3 Drive
4

Main

motor
PCB

1-11

~

Specifications

1.

Memory

of

50-321

capacity
(1) Unformatted
(2)

Fo~matted

(1

6 sectors/track)

2. Recording density (side

1,

trk

39)

500 k byte
328 k byte

5876

BPI

(Double density recording)
(Double density recording)

(Double density recording)

3. Transmission speed

Track mean speed

4.

waiting

5. Access time

(1

)

Between tracks

(2)

Between tracks mavin g average

(3)

6.

7.

Settling

Motor

Motor

time

starting

speed

time

8. Track density

9. Total number

of

tracks

10. Inner circumference

11

..

Outer circumference

12. Recording system

track

track

time

radius

radius

250 k bit/sec

100

msec

15

msec

220

msec

15

msec

0.5 sec

:,300

rpm

48TPI

80

36.52

55.03

36.52

34.40

MFM

mm
mm

mm
mm

(Double density recording)

(trk

39,

side 0)

(trk

00,

side 1 )

(trk

39,

side 0)

(trk

39,

side 1)

13.

R/W

head

positioning

14.

Main axis

15.

Detectors

(1

)

Index hole

(2)

Track

(3)

Wright

(4)

Track address

16.

Ambient

(1

)

Temperature

(2)

Relative

(3)

Maximum

(4)

Vibration

17.

Transportation and storage

(1

)

Temperature

(2)

Relative

(3)

Vibration

(4)

Impact

motor

detector

No.OO

protect

conditions

humidity

wet-bulb

humidity

detector

detector

detector

temperature

condition

Voice

coil

motor

Outer

rotor-type

brush less

Photoelectric conversion
Photoelectric conversion
Photoelectric conversion
Photoelectric conversion

4°C

to

43°C

20%

to

80%

(no condensation)

29°C

0.6G,5

-40°C
less than
less than 3G,

,less than

,..,.

60

Hz

to

65"C

95

% (no condensation)

50

,...

60

50

G

transistor

Hz

motor

1-12

18.

Power supply

(1

)

+12V(±5%-)

(2)

+5V(±5%)

0.7 A (typ) (at reading/writing)

1.9 A (max) (at

0.25

A (typ) (at reading/writing)

0.4

A (max) (at

motor

motor

starting)

starting)

19.

Power consumption

: . 9.7 W (typ)

20. Reliability
(1

)

MTBF

(2)

MTIR

(3)

Soft

error rate

(4)

Hard error rate

(5)

Seek error rate less than once every 1

1000

HOURS

30

minutes
less than once every 1
less than once every

21. Connectors
(1

)

Power supply

(2)

Signal

connector

connector

AMP.
3 M

PIN

PIN

3463-0001

1-480424-0

(POH)

09 bits

12

10

bits

06 seeks

or

equivalent

or

equivalent

1-13

CHAPTER 2

DISASSEMBLY

2.1

Precautions

2.2

Disassembly

2.2.1 Optional cover and upper case .........................................................

2.2.2

2.2.3 Q10SYM board .................................................................................

2.2.4

2.2.5

2.2.6 Power lamp ............................... .................................... ......... ...... .....

2.3

Disassembly
monitor

2.3.1 Cover .................................................................................................

2.3.2

2.3.3 Board

2·.4

Disassembly

keyboard

2.4.1 Cover ................................................................................................ 2-1 2

2.4.2 Replacement

2.5

SO-321

2.5.1 Main board set .......................................................

2.5.2 Voice coil

2.5.3 Sub-frame, collet set, collet lever

2.5.4 Front panel ......................................................................................

2.5.5 Disk guide

2.5.6 Disk drive

2.5.7 Disk guide

2.5.8 Index

2.5.9 Index

2.5.10 Eject lock lever set ..........................................................................

for

disassembly

and

reassembly

Q1

OGMS board ..................................................................................

Q1

OPS

board (Power supply unit) ......................................................

FDO

(SO-321 ) unit ............................ ,.......................................... .....

and

reassembly

unit}

..................................................................................................

CRT

..................................................................................................

(CRT

drive unit) ..................................................................... 2-11

and

reassembly

unit

................................................................................................ 2-1 2

of

key switches and

LED

lamps ....................................................................................... 2-1 3

mechanism

and pad arm .......................................................................... : .........

and eject transmission

pulley set .........................................................................................

.....................................................................................

motor

unit (VCM unit) ....................................................

(L)

unit,

motor

and endless belt ..................................................

(R),

idler set and

detector
detector

A set ........................................................................

B set ........................................................................

ANDREASSEMBL

Y

CONTENTS

and

reassembly

of

the

main

of

CRT (green

of

the

write

protector set

level ........................................................... 2-21

disk

............................................

unit

...........................................

00

.......................

drive

2-1
2-2
2-2

2-4
2-5
2-6
2-7
2-8

~.

2-9
2-9

2-10

2-14
2-14
2-16

2-18

2-20

2-24

2-26
2-28
2-30
2-32

2.1

Precautions

Before

for

disassembly

disassembling

or

reassembling

and

reassembly

the

QX-1

0,

pay

attention

to

the

following.

1) Make sure
Disconnect the AC cable

2) Disconnect the cables of the keyboard,

3) Power is charged in the electrolytic condenser in
the

power

4) Take special care
If

the anode cap is removed,

posed between the cap and GND.

5)

When
with

6)

Be

sure

7) Do

not

When

8)

Abbrevia-

tion

the

power

switch

a substrate using ICs such

your hands

to

use

the

touch

the

the Q 10

switch

from

is turned off. So take care

to

keep the CRT unit away

to

discharge static electricity

specified screws. (See Table 2-1 )

contact

SYM

surfaces

substrate

Abbreviations

is turned off.

the AC inlet.

CRT

it

must

be properly discharged

as a circuit

of

connectors

is

removed

Name

or

unit, etc. connected

the

power

to

avoid electric shock.

from

cathode rays

board is handled, be sure

prior

to

handling.

with

bare hands.

transported,

for

screws

and

to

supply unit

or

with

disconnect

small

the

OX-1

O.

for a few

the yoke coil.

a resistor

to

touch

the

battery

parts

minutes after

of

about

10m

inter-

a grounded device

connector

Rough Sketc h

CN

1 2.

CS

CP

CB

CPO
CTB

CTC

CTBR

CO

HH

PW

SW

OW

CW

HN

Cup

screw

Cross-recessed pan head machine

Cross-recessed head

Cross-recessed head C.P.screw
Cross-recessed head
Cross-recessed head

Cro~s-recessed

Cross-recessed head oval counter sunk
Hexagon

PI

ane

Sprinc

socket

washer

-·;-,.3sher

bind

tapping

bind

tapping

cup

tapping

head Brajier head

half-point

set

screw

screw

(with

screw
screw

tapping

screw

outside

-

Outside

Conical

Hexagon

toothed

toothed

nut

lock washer

lock washer

screw

screw

toothed

lock

washer)

(@

@

@

@
@

(@

@

©

@

@

©

@

©

@

~

~

~

(J::EJ

~

dfm-

~

.~

~

~

~

I

D

g

Table

2-1

2-1

2.2

Disassembly

2.2.1

Optional

1.

Remove
Fig.

2-1.

cs:

M4 x 12

cover

Disassembly

two

screws

x 4

and

reassembly

and

upper

case

procedure

of

the optional cover shown in

of

the

main

unit

Notes

on

disassembly

2. Remove the connector cap A between the option
cover and

3. Remove
end

lower case.

two

screw hole caps located in the right

of

the upper case

top

with a (-)

screwdriver.

~~~~~r-OI:>ticmaJ

Fig. 2-1

• To replace connector cap A,
tional cover and
nector cap A
push

the

Screw hole cap

Uppercase

~hen

into

the groove

upper part.

insert the lower part

first

replace the op-

of

the

lower

cover

of

con-

case and

4. Remove the the four set screws
shown in
CS:

5. Remove the
2-4.(CN6 and CN7 on the

Fig.

M4 x 12

2-3.

x 4

two

connectors

shown

Q1

0 SYM substrate)

of the upper case

in

Fig.

Fig

Upper case

Q10

SYM

Fig.

Fig

2-2

2-3

BOARD

2-4

2-2

Disassembly

procedure

Notes

on

disassembly

6. Note: Upper and
grounding wire.

lift

the

upper case

the

rear part come

the

lower

case.

lower

cases are connected via the

by

hand and remove

to

the

front, and

put

• The CN6 us 1 Upper case
removed

•

When

CN7 are
board.

it

so

that

it

in

front

of

Lower
case

by

opening left and

replacing, make sure the cables

not

trapped by

Fig.

lock

type, and should be

right

levers.

the

case

or

2-5

Q 1 0

of

CN7

GMS

and

7.

Remove
speaker
the

grounding wire.

CTC:

the

screw

of Q 10

M3 x 12

SYM

x 1

on

the

board, and

right

side

of

the

disconnect

Groundi

wire

Upper

•

When
CN7 are
board.

1"::1<::1"-----

replacing, make sure

not

trapped by the case

Fig.

2-6

the

cables

or Q 10

of

CN7 and

GMS

• Carry
reassembly.

out

above procedure in reverse

for

2-3

• The

tightening

Fig.

2-7

torque is 5

kg·cm.

2.2.2

Q10

GMS

board

Disassembly

1.

Remove the upper case referring

2.

Remove screws No. 1 ~ 4

',he right.

CTB:

M3 x 10

CPO:

M3

3. Hold the

straight up. Then the connector on the right
screw 1 shown in Fig. 2-8 comes off.

4. Remove grounding plate C and shielding plate at-

tached

to

cpo:

M3

OW: M3

HN: M3

x 1

x 8 x 3

Q1

0 GMS board

the

Q1 0 GMS

x8

x3

x3

x3

procedure

shown

by

both hand and

board.

to

2.2.1 .

in drawing· on

lift

of

it

the

Notes

on

disassembly

• Before handling the board. be sure
static

electricity from your body.

•

To

replace the board. set connectors CN9 and

CN

1 0 correctly and securely

board.

• When replacing the board. pay attention
ection

of

grounding plate

Note:

When

a defective 01 0 GMS board is re-

placed.

grounding plate C and shielding plate are

not

included in spare parts.

• The tightening torque

is 5 kg·cm.

C.

of

screw 1 shown

to

discharge the

in

the 01 0 SYM

to

in

Fig.

the dir-

2-8

• Carry
bly.

~CPO

_......;;;;

I.....--

___

\MINN-QW

o:D--HN

Fig.

2·9

out

above procedure in reverse

Grounding plate C

g

......

<

__

~

O:hieldin

GMS

for

plate

reassem-

2-4

2.2.3

Q10

SYM

board

Disassembly

1.

Remove the upper case and

to

2.2.1 and 2.2.2.

ring

2.

Remove the four screws indicated by arrow

marks ian the drawing on the right.
CTB:

M3 x 10

3. Remove the connector on the
CNS

- Power supply
CN13 ­CN

1 2 - Battery

4. Remove the board by opening the claws provided
on the

left and right sides

x4

FAN

procedure

Q1

0 GMS board refer-

Q1

0 SYM board.

of

the board.

Notes

on

Fig.

• The tightening torque

Note: The connector
CN

1 2 and battery must also

is

board itself
the battery

transported

disassembly

2-10

of

the screws is 5 kg.m.

for

connection between

be

removed when the

to

prevent

sh<;>rting

of

5. Take

• Carry
bly.

off

the board.

out

above procedure in reverse

for

reassem-

• Before holding the board,
static electricity from your body.

• Take

•

off

the board lifting the

To

replace it, insert the rear side

be

sure

front

first

to

discharge the

side first.

.

2-5

2.2.4 Q10PS board (Power supply

Disassembly

1.

Remove the upper case according

procedure

unit)

to

2.2.1 .

Notes

on

disassembly

2. Disconnect the AC input
connector connected
board.

connector

to

CN8 of the

CN
Q1

3. Remove the four screws shown in the

the right.
CS:

M4x8

x4

OW:M4x4

4. Remove the grounding plate.

5.

Lift the

power

supply

unit

and take

it

1 and the
0 SYM

drawing

off.

on

Insulating paper A

Fig.2-11

•

To

replace the grounding plate, pay attention to the

direction

• In the part A
grounding
in

that

(with

wire

order.

the

tooth

tip facing up and left).

shown

in

Fig.

2-11,

press terminal and

attach screws,

toothed

CS;$

Grounding

terminal-_oe:::~=::;od

Ow-

washer

• Carry
bly.

out

above procedure in reverse

for

reassem-

•

When

a defective
sulating paper A
in spare parts.

Fig.

power

shown

2-12

supply

unit

in Fig. 2-11 is

is

replaced, in-

not

included

2-6