Yamaha Portatone PSR-172 User manual

SERVICE MANUAL
■ CONTENTS
SPECIFICATIONS.............................................................................. 3
PANEL LAYOUT ................................................................................. 4
CIRCUIT BOARDS ............................................................................ 5
OVERALL CIRCUIT DIAGRAM ......................................................... 8
PARTS LIST
PK 001697
Copyright (c)Yamaha Corporation. All rights reserved. PDF-K702 ’03.03
The PSR-172 service manual provides only the differences as
compared with the PSR-170.You must have a PSR-170 service
manual (PK 001652 ) before servicing this unit.

PSR-172
2
IMPORTANT NOTICE
This manual has been provided for the use of authorizedYamaha Retailers and their service personnel.It has been assumed
that basic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and
understood by the users, and have therefore not been restated.
WARNING : Failure to follow appropriate service and safety procedures when servicing this product may result in
personal injury, destruction of expensive components and failure of the product to perform as
specified. For these reasons, we advise allYamaha product owners that all service required should
be performed by an authorizedYamaha Retailer or the appointed service representative.
IMPORTANT : This presentation or sale of this manual to any individual or firm does not constitute authoriza-tion,
certification, recognition of any applicable technical capabilities, or establish a principal-agent
relationship of any form.
The data provided is believed to be accurate and applicable to the unit (s) indicated on the cover.The research engineering,
and service departments ofYamaha are continually striving to improveYamaha products.Modifications are, therefor, inevitable
and changes in specification are subject to change without notice or obligation to retrofit.Should any discrepancy appear to
exist, please contact the distributor’s Service Division.
WARNING : Static discharges can destroy expensive components. Discharge any static electricity your body
may have accumulated by grounding yourself to the ground bus in the unit (heavy gauge black wires
connect to this bus).
IMPORTANT : Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply
power to the unit.
WARNING : CHEMICAL CONTENT NOTICE !
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic
(where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency
(and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY
REASON WHAT SO EVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose
eyes to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.
■WARNING
Components having special characteristics are marked Zand must be replaced with parts having specification equal to
those originally installed.

PSR-172
3
■ SPECIFICATIONS
Keyboard
61 standard-size keys (C1 - C6)
Display
Large multi-function LCD display
Setup
STANDBY/ON
MASTER VOLUME : MINI-MAX
Panel controls
Overall, SONG, VOICE, STYLE, DEMO, POTABLE
GRAND, DJ, METRONOME, Dict., L, R, TEMPO/TAP numeric
keypad (0 - 9, +,-)
Voices
100 panel voices (max.polyphony : 16)
Effects
Dual (Included in Voice),
Harmony/Echo (Included in Voice),
Split (Included in Voice),
Sustain
Auto Accompaniment
100 styles
Fingering : Multi Fingering
Sections : Intro, Main A, B, Ending, Fill
Overall controls
Multi Pad, Grade,Talking, Transpose, Tuning, Accompani-ment
Volume, SongVolume, Metronome Volume
Style controls
Acmp On/Off, Sync-Start, Start, Stop, Intro/Ending/rit., Main A,
B (Auto Fill)
Song controls
Start, Stop, Pause, A-B Repeat, Fast Forward, Rewind, Mel-
ody Voice Change
OneTouch Setting
1/style, 1/song
Multi Pads
4 pads x 10 banks
Yamaha Education Suite
Dictionary, Lesson 1-4
Preset songs
100 songs
Amplifier
2.0W + 2.0W
MIDI
IN/OUT
Auxiliary jacks
PHONES/OUTPUT, DC IN 12V, MIDI IN/OUT, SUSTAIN
Speakers
12cm x 2
Power consumption
VL/CSA 6.8W, CE7.5W (when using PA-3B power adaptor)
Power supply
Adaptor : Yamaha PA-3C or PA-3B AC power adaptor
Batteries : Six “D”size, R20P(LR20) or equivalent batteries
Dimensions
931 x 348.8 x 127.9 mm (36-2/3" x 13-3/4" x 5-1/16")
Weight
4.4kg (9 Ibs., 11 oz.)
Supplied accessories
Music Rest, Owner’s Manual, Song Book
Optional accessories
Headphones : HPE-150
AC power adaptor : PA-3C or PA-3B
Keyboard stand : L-2L, L-2C

PSR-172
4
● Top Panel
■ PANEL LAYOUT
q[MASTER VOLUME] dial
wPower switch ([STANDBY/ON])
eLESSON [L] (Left) and [R] (Right) buttons
r[Dict.] (DICTIONARY) button
t[OVERALL] button
y[SONG] button
u[VOICE] button
i[STYLE] button
o[PORTABLE GRAND] button
!0 [METRONOME] button
!1 [DJ] button
!2 Numeric keypad, [+/ON] and [-/OFF] buttons
!3 [ACCOMPANIMENT ON/OFF]
([A-B REPEAT]) button
!4 [SYNC START] ([ PAUSE]) button
!5 [START/STOP] button
!6 [INTRO/ENDING/rit.] ([ REW]) button
!7 [MAIN/AUTO FILL] ([ FF]) button
!8 [TEMPO/TAP] button
!9 [DEMO] button
@0 [MULTI PAD/DJ GAME] buttons
● Rear Panel
@1 [MIDI IN], [MIDI OUT] terminals
@2 [SUSTAIN] jack
@3 [PHONES/OUTPUT] jack
@4 [DC IN 12V] jack
@1 @2 @3 @4
GrandPno
q
we
r
t
u
o
!0
!1
!7
y
!6
!5
!4
!3
!2
@0
!9
!8 i

PSR-172
5
Note : See parts list for details of circuit board conponent parts.
DM-LCD (XZ643D0) ..............................................................................5
PN-AM 1/2 (XZ644C0)...........................................................................6
PN-AM 2/2 (XZ644C0)...........................................................................7
VR (XZ644C0)........................................................................................7
■ CIRCUIT BOARDS
● DM-LCD Circuit Board
to MK-L
to PN-AM 1/2-CN102 to PN-AM 2/2-CN201
to PN-AM 2/2-CN203
Pattern side
Component side
2NA-V692510 2

PSR-172
6
● PN-AM 1/2 Circuit Board
Component side
DC IN 12V PHONES/
OUTPUT
to BATTERY to DM-LCD-CN04 to PN-AM 2/2-CN202 not installed
to VR-CN106
to SPEAKER L
A-B
REPEAT PAUSE START/ STOP REW FF
ACMP
ON/OFF SYNC START START/ STOP
STANDBY/ON
INTRO/
ENDING/rit. MAIN/ AUTO FULL TEMPO/ TAP
LESSON
LLESSON R
OVERALL
Dict.
2NA-V708340 7

PSR-172
7
Component side
● VR Circuit Board
● PN-AM 2/2 Circuit Board
MIDI INOUTSUSTAIN
to DM-LCD-CN02 to PN-AM 1/2-CN103 to DM-LCD-CN01
to SPEAKER R
STYLE
DEMO
–/OFF 0/RESET +/ON
789
456
123
PORTABLE
GRAND DJ
METRONOME
1234
VOICE
SONG
MULTI PAD/DJ GAME
to PN-AM 1/2-CN105
MASTER VOLUME
CN106
Component side
PN-AM 2/2, VR : 2NA-V708340 7

DM-LCD, PN-AM, VR : 28CC1-8819402
MK-L, MK-H : 28CC1-8819596 7
WARNING
Components having special characteristics are markedZand must
be replaced with parts having specification equal to those originally
installed.
: Mylar Capacitor
: Ceramic Capacitor
: Semiconductive Ceramic Capacitor
: Metal Oxide Film Resistor
Note : See parts list for details of circuit board component parts.
PN-AM
VR
MASTER
VOLUME
PHONES/
OUTPUT
STANDBY/ON
DC IN 12V
SPEAKER
L
1/2
*1
*1:The fuse is soldered.
2SB1135 or 1269
POWER AMP
REGULATOR
+5V
■ OVERALL CIRCUIT DIAGRAM (Modifying part)
TR101, R119, R120 and IC002 (DM-LCD) have been modified.
IJKLH
3
4
5
6
7
8
PSR-172
8

PARTS LIST
■CONTENTS
OVERALL ASSEMBLY.............................................................................................................................2
KEYBOARD ASSEMBLY ......................................................................................................................... 4
ELECTRICAL PARTS ........................................................................................................................5 – 8
■WARNING
Notes : DESTINATION ABBREVIATIONS
The numbers “QTY” show quantities for each unit.
The parts with “--” in “PART NO.” are not available as spare parts.
This mark “ } ” in the REMARKS column means these parts are interchangeable.
The second letter of the shaded ( ) part number is O, not zero.
The second letter of the shaded ( ) part number is I, not one.
M : South African model
O : Chinese model
Q : South-east Asia model
T : Taiwan model
U : U.S.A. model
V : General export model (110V)
W: General export model (220)
N,X : General export model
Y : Export model
A : Australian model
B : British model
C : Canadian model
D : German model
E : European model
F : French model
H : North European model
I : Indonesian model
J : Japanese model
Components having special characteristics are marked Zand must be replaced with parts having speci-
fication equal to those originally installed.

PSR-172
2
■OVERALL ASSEMBLY
140
260
120
120b
120c
C150
C150
C150
C150
C130
C60
C70
C50
C80
C70
C30
C40
C20
C110
C100
C100
10
40
50
80
30
60
200
70
90
240 310
310
310
180
160
170
20
270
130 190
300
150
150
250
110
C10
C120
C180
100
L20
L30
L60
L40
L110
240
L120
L130
L40
L50
L120
120a
120e
120e
120d
120e
120f
Battery Cover Assembly
Lower Case Assembly
Keyboard Assembly
(See page 4.)
LCD Unit
Music Rest
210
240
240
240 210
240
240
240
20
270
C90
C90
1/2
2/2
C160
C160
C170