Fisher CR-5125 User manual

SERVICE MANUAL
FISHER
CR-5125
_ Stereo Cassette Tape Deck
with Double Dolby, Three Heads
and Remote Pause Control
The First Name in High Fidelity

CONTENTS
SPEGIFIGATIONS 232.202 0b oeccd, BER a a aS See Bate tea Hie kaw See eee dee ees 3
DISASSEMBEEY, esr xctec 8-6-6 wha ccepiars Sooke oid awe e eee LE ed OPES 4-6
MECHANICAL ADJUSTMENTS ....... 2.0.00. eee teens 7&8
ELECTRICAL ADJUSTMENTS ....... ccc ce te eee ee nena 9-14
REMOTE CONTROL ADJUSTMENT
Received Frequency Adjustment .......... 0000 cece eee eee ee ee teenies 15
REMOTE CONTROL TRANSMITTER
Transmitted Frequency Adjustment........... 000 ccc cece cee eee eens 16
Transmitter Parts List... 0... 0... ee ence een eeaneeees 17
Remote Control Transmitter Exploded View .......... 0.000 c ee eee eee n ee neee 17
Transmitter Schematic Diagram ....... 0... 0c cc eee eee eee eens 18
Transmitter P.C.Board (Top & Bottom Views) .............00 cc cece eee eeeees 18
PARTS. EIST vice oc eestg Set ris alee atk Cee nes, Shae eis: eee lw he ee 19 —25
EXPLODED VIEW (CABINET) ........ 0... c ce eee ee eee eee teens 26
EXPLODED VIEW (CHASSIS -1) 1.0.0.0... cece cee ee eee ee eee eanae 27
EXPLODED VIEW (CHASSIS -2) .. 0... 0... ccc eee enen eee eeees 28
EXPLODED: VIEW (CHASSIS 33 TOp) 63.5.9 65.06 He of escee dace op ack dee ee ae bie 29
EXPLODED VIEW (CHASSIS 4 Bottom) ......... 0.0.0: cece eee ee eee eens 30
BLOCK DIAGRAM) josie ie tea nwt Ou eee a nek otra etree eet wee wc 31 & 32
DOLBY NR UNIT SCHEMATIC DIAGRAM .......... 0.00 e cece eee eee eens 33
DOLBY NR UNIT P.C.BOARD (TOP & BOTTOM VIEWS) ..........0 0. cece ene 33
RECORD EQ. UNIT SCHEMATIC DIAGRAM .......... 00.0 c eee e eee ee eeee 34
RECORD EQ. UNIT P.C.BOARD (TOP & BOTTOM VIEWS) ..............-0.000- 34
POWER SUPPLY P.C.BOARD (TOP & BOTTOM VIEWS) ............00 cee eeeee . 35
CONTROL AMPLIFIER P.C.BOARD (TOP & BOTTOM VIEWS) .................. 36
WIRING DIAGRAM (CONTROL SECTION) .......... 00. cece eee eee eee 37 & 38
SCHEMATIC DIAGRAM (CONTROL SECTION) ......... 0.02. ee ee eens 39 & 40
AMPLIFIER BASE P.C.BOARD TOP VIEW .......... 000 eee eee eee eee 41 & 42
AMPLIFIER BASE P.C.BOARD BOTTOM VIEW ........... 00: cece ee ee nent 43 & 44
WIRING DIAGRAM (AMPLIFIER SECTION) .............. 200: cee eee eeee 45 & 46
SCHEMATIC DIAGRAM (AMPLIFIER SECTION) ........... Satish dilate ged tee 47 & 48
TRANSISTOR LEAD IDENTIFICATION .......... 00 cece eee eee ee eee nes 49

SPECIFICATIONS
Motors ™icisi ou) see Sind toler, iar eect ateane ss hatalis tod eosin (1) DC-Servo, (1) DC-Governor
Cassette LOad in %1g 5x56 toad, Diced Rae bie EAE a og ASO awn ed wD RES Rae Front
UWE SYSteM pies mas eee b aa cone Aone N bart wee and bake ote eaea eee (2) Capstan
NGmberor heads 44:5 Awl neseatea oe Geek aay ao eee chew eda data nase dsiternee aired 3
Plead Material sits Ged give lne tay Wace bdo pre teh ee ee ta ea gen Sr tetas Shae ace (3) Ferrite
WoW Plutier wocces coe eos Bee aca ne eer alee yew een ee Od heeds 0.04% WRMS
Signal-to-Noise Ratio
DOIDY OF u.8 cents Stal Shee ahaa aw tenerk Bae yh Sala goed cuahadme ee eta t 55dB
DOIDY: OW. syle Sree eet ln ee eee ee awe hale es Rae ee tats 64dB
EraSO: PROTO: cal A hae op i hates ge Se eater ee alee Caan args Slate haens aia aches toes ty 70dB
Channel Separation: oo, 42-035 ara 4 94s Ses winded ete wae Ke AS ESAS he wee 40cB
BiGlial ChOSStANC: 505.5..2: aucoie uae eeck eae te Woe Mearaa eave Abe wlan atte tea ahve dels Rew tee 70dB
Frequency Response
Normal. Tape (+3dB)s5 occ oodcsa isd vans veotind taba bones eee 30 ~ 15,000 Hz
CrOo-lape(23dB) i aocs onc de segma he tie we ok ay tee wee td Sen wed 30 ~ 18,000 Hz
Total Harmonic Distortion atOVU... 0... ec ee ee ene ene naenaeas 1.4%
Fast Forward/Rewind Time (C-60).......... 00.0 cece cece cee eee cereeeeeueae 84 sec.
Level Indicators
Record Level VU Meters... cc. dissec daasen a aete teu weasa de oad yA oe ede peewee. 2
Peak Indicating LEDS: vec 354 < Sager hh hey et wa cedary bow Bua cigh ce ene Sereda dian Barges 2
INPUTs (Sensitivity/Impedance)
(2) MICKOPHONG 4.0 2.2.62 tease aR each wie tate Roe eee weeps dele wey 0.2 mV/6002 ~ 10 kQ
(2) EINE BM D6IBY a2 & cs Gres vin te exceed a Mewes ao ores Wis ate 100mV/100 kQ
Input-Level'Controlsino sais Wa Dew SS eee Fee e oso aw wow Swe DG sue ees aks 2
Outputs (Level @0 VU)
LUNE ics sarin erene ute & Rasabu See ale aati «aed 's aetna area ek ee a Oe RE 1 V/5 kQ
SIbEO PRONES 25 5.vecb cucu alone Beare Oe e eS oan eae IS 82/30 mV (82. load)
VU Meter Range y iscsiaccccsine Ste ota ie alice Ff ante aie whee o widaw dial eeetae ews —20VU ~ +5VU
Tape Selector Switch. ... 0.00.00. cece cee eee eee een nee eunus Norm, CrO2, FeCr
FIM Dolby: SWE Rit 0c ena tidgul he Mee anid sca hans ice dN he Sk end alta ee ee Yes
Power Requirements (50/60 Hz)... ....... 0.00 cc cee eee eee neces 120V AC +10% 25W
Dimensions
(WxDxH)
....
0.2.0...
cece
eect
e
eee
e
en
eees
17-1/3”
x
12-1/4"
x
4-3/4"
WEIGHS <cieodmaia Grvere wea ek x Dee Pompey eee ate al 6 a a eh Ms cosan 22.5 Ibs.
Cabinet Material. ycctcene nye weacud ta oeu seb le tee HEE SOR ROE Walnut-grain vinyl veneer
Operation’. cic sett amie ee ee oS VEEN a Rho whois Electronic All Functions Solenoid
(Pape COUNLEE 3 aaa ke ais arcu cane ant baad Lee taled oad hah peda meted t Mechanical
Wireless: Remote Control 05 2.5 oasis ve vetoed Sa ea Gao wee re Daas ee ee bale Pause
—Specifications subject to change without notice.—

DISASSEMBLY INSTRUCTIONS
COVER REMOVAL
1. Remove four screws (1 — 4) and four washers fastening the
Cover.
2. Lift cover off.
3. Reassemble in reverse order.
SHEET PANEL REMOVAL
1. Turn the unit over onto a clean soft surface.
2. Remove the four Legs by removing the four screws (5 — 8).
3. To take off the Sheet Panel, remove two screws (9 — 10).
.—
=(9)
4. Reassemble in reverse order.
COMPLETE FRONT PANEL REMOVAL
1. Follow the instructions for Cover Removal.
2. Pull out the seven Switch Knobs (A —G) and the INPUT
Level Control Knobs (H and I).
3. Turn the unit over onto a soft surface and remove the three
screws (11 — 13) fastening the lower side of the Front Panel.
@ @)
(2) ®
@DARKAK eee
see A®
4. Place the unit in an upright position and remove the three
screws (14— 16) fastening the upper side of the Front
Panel.
Ohi
5. Pull out the two connectors (CN3 and CN8) from the
Amplifier Base P.C.Board. Then, remove the connector lead
wires from the wire band.
6. Remove the three spacers (J — L) and pull the Complete
Front Pane! off the unit.
REAR PANEL REMOVAL
1.
Follow the instructions for Cover Removal.
2. Remove the nine screws (17 — 25) fastening the Rear Panel.
Then, remove the two screws (26 and 27) holding the Jacks
(LINE IN and LINE OUT) to remove the Rear Panel.
Ta | |e ||
ree a ® @ i || ae A -
@@ P=
On—
3. Reassemble in reverse order.
—4~—

DISASSEMBLY INSTRUCTIONS (continued)
CONTROL AMPLIFIER P.C.BOARD ASSEMBLY
REMOVAL
1.
2. Remove three screws
AMPLIFIER BASE P.C.BOARD ASSEMBLY REMOVAL
1.
3.
Follow the instructions for Cover Removal.
(28 — 30) fastening the Control
Amplifier P.C.Board and remove fiber washer.
. TO remove the Control Amplifier P.C.Board Assembly, pull
out the eight connectors (CN10 — CN17) from the Control
Amplifier P.C.Board.
Reassemble in reverse order. Follow the instructions for the
Control Amplifier P.C.Board Mounting in the Mechanical
Adjustments whenever the P.C.Board is attached to the unit.
NOTE:
Refer to the Wiring Diagram when the connectors are
attached to the Control Amplifier P.C.Board.
Follow the instructions for removal of the Cover, Rear
Panel, Complete Front Panel and Control Amplifier
P.C.Board Assembly.
Remove six screws (31 — 36) fastening the Switches and
remove Nut (M) and washer holding the INPUT Level
Controls.
al
oe
Remove two screws (37 and 38) and two fiber washers
holding the Amplifier P.C.Board and then, remove screw
(39) fastening the Frame.
a ae
. Unsolder the four lead wires (two black, blue, and red) from
the Meters. Pull out the four connectors (CN4, CN5, CN7,
and CNQ) from the Amplifier Base P.C.Board, and connector
(CN21) from the Power Supply P.C.Board.
. Then, carefully remove the Amplifier Base P.C.Board from
the unit.
. Reassemble in reverse order.
NOTE:
Refer to the Wiring Diagram when the connectors are
attached to the Amplifier Base P.C.Board, and the lead wires
are soldered to the Meters.
CHASSIS ASSEMBLY REMOVAL
his
Remove the Cover, Complete Panel and Control Amplifier
P.C.Board Assemblies by following the removal instructions
for each.
2. Turn the unit over and remove two screws (40 and 41)
fastening the Chassis. Then, place the unit in an upright
position.

DISASSEMBLY INSTRUCTIONS (continued)
3. Remove six screws (31 — 36) fastening the Switches, and
remove Nut (M) and washer holding the INPUT Level
Controls.
4, Remove four screws (42 — 45) fastening both sides of the
Chassis.
5. Unsolder the five lead wires (two black, blue, red, and gray)
from the Meters and pull out the four connectors (CN4,
CN5, CN7, and CN9} from the Amplifier Base P.C.Board,
and the two connectors (CN22 and CN23) from the Power
Supply P.C.Board.
6. Pull the Chassis Assembly off the unit.
7. Reassemble in reverse order.
NOTE:
Refer to the Wiring Diagram when the connectors are
attached to the Amplifier Base P.C.Board and the lead wires
are soldered to the Meters.

MECHANICAL ADJUSTMENTS
CONTROL AMPLIFIER P.C.BOARD MOUNTING
Mount the P.C.Board by the following procedures.
1. Mount the Control Amplifier P.C.Board by temporarily
tightening the three screws, so that the Stop Lever of the
Completed Select Button is located below the Release Lever
of the Function Switch as illustrated.
Control Amplifier P.C.Board
Release Lever
Stop Lever
Serew
fr
1
j Cotrol Amplifier P.C.Board
move the P.C.B.
NOTE:
The Control Amplifier P.C.Board can easily be slid.
2. Move the P.C.Board to bring each Select Button Lever into
contact with each switch. Then, adjust the mounting
position of the P.C.Board correctly confirming that each
button except PAUSE button is securely locked by moving
the P.C.Board.
Function Switch
Select Button Lever
3. After tightening the mounting screws, try to push the Select
Buttons again and confirm that they are securely locked.
Py [ae
STOP SWITCH POSITION ADJUSTMENT
1. Push one of the Select Buttons and lock it. Then, gradually
push the STOP button. The Select Button should be released
after the Stop Switch is changed over.
2. If necessary, loosen the screw fastening the Switch and
adjust the position by moving the Switch as illustrated.
Stop Switch
3. After the adjustment, tighten the screw and secure it with
paint or glue.
NOTE:
Turn off the Power Switch whenever this adjustment is
performed.
R/P SOLENOID POSITION ADJUSTMENT
1. Remove the Cover and Complete Front Panel by following
instructions given earlier.
Prepare for a spacer of 0.3mm as illustrated.
2. Loosen the two screws fastening the Solenoid and insert the
spacer in the Solenoid as illustrated. Then, set the unit in the
playback mode by pushing the PLAY button.
R/P Solenoid
MeseorscEtiosececy
move the
Solenoid
Adjusting Hole
Slide Base

MECHANICAL
ADJUSTMENTS
(Continued)
3. Insert a screwdriver into the adjusting hole as illustrated and
turn the screwdriver to obtain the clearance of “‘0’’ between
the Slide Base and the spacer. Then, check to see that there
is clearance between the Pinch Roller Arm and Slide Base.
Adjustment
ANS
Capstan
Spacer
Slide Base
() CHES
4. After the adjustment, tighten the fastening screws and
secure them with paint or glue. Then, take out the Spacer
from the Solenoid after the STOP button is pushed.
STOP SOLENOID MOUNTING
* Mount the Stop Solenoid, using the following procedures
whenever it is replaced or removed.
1. Mount the Stop Solenoid on the Completed Select Button
by temporarily tightening the two screws.
2. Press the Solenoid in the direction of the arrow as illustrated
and tighten the fastening screws.
Screw Screw
Stop Solenoid
3. After mounting, secure the screws with paint or glue.
FLYWHEEL ADJUSTING SCREW ADJUSTMENT
1. While moving the Capstan up and down as illustrated, slowly
turn the Flywheel Adjusting Screw clockwise to obtain the
clearance of ’’0’’ between the Adjusting Screw and Flywheel.
Adjustment
a
Adjusting Screw
Adjustment
cs.
djusting Screw
Supporter
Flywheel
NOTE:
Do not turn the Flywheel Adjusting Screw forcibly.
2. Turn the Screw counter-clockwise by 45° — 90° from the
position obtained in Item 1.
3. After the adjustment, secure the Screw with paint or glue.
4. Perform the same adjustment for the other adjusting screw.

ELECTRICAL ADJUSTMENTS
REQUIRED EQUIPMENT
VTVM
Frequency Counter
Audio Signal Generator
Attenuator
Dummy Load (47 k-ohm)
Dual-phenomenon Synchroscope
Test Tapes
* 3kHz test tape (Example: TEAC MTT-111) for Tape
Speed Adjustment
* 10kHz test tape (Example: TEAC MTT-114) for Head.
Azimuth Adjustment
* Test Tape for Dolby Level Calibration (Example: TEAC
MTT-150) in Playback Gain Adjustment
® Test Tapes for recording and playback operations
* Norma! Tape (Example: BASF TP-18LHS T308S)
Ferrichrome Tape (Example: SONY DUAD C-60)
* Chromium Dioxide Tape (Example: BASF TP-18CrO2
C401R)
@ Test Tapes for Tape Running Condition Adjustment
* TDK SA C-90
* MAXELL UDXLII C-90
@ Alignment Tool
Prior to the Electrical Adjustments, set the unit and the
measuring instruments as follows:
*
Dolby FM Switch .......... 0.0.00. 00 00 eee OFF
* Dolby NR Switch ......02..2... 02.00.0000 ee OFF
* Bias Switch. ...........200000- ee ee LOW
* Equalizer Switch ..............00000ee NORMAL
* Input Select Switch 2... ..... 0.00000 eee LINE
* Monitor Switch... 0.0.0... 00. cee ee ee ee TAPE
* Audio Signal Generator............. 1kHz0dB,1V
NOTE:
The Electrical Adjustments should be performed in the
order as below.
TAPE SPEED ADJUSTMENT
1. Remove the Cover from the unit and connect a frequency
counter to the left or right channel:-LINE OUT as illustrated.
LINE OUT
PLAY BACK
Frequency Counter
3 kHz (+5 Hz)
2. Play back a 3kHz test tape (Example: TEAC MTT-111).
Then, adjust the potentiometer inside capstan motor by
turning it while the test tape is being played back until the
frequency counter reading becomes 3 kHz (+5 Hz).
Em
HEAD AZIMUTH & TAPE RUNNING CONDITION
ADJUSTMENT
ils
wo
Prepare for the two test tapes as described below for the
Tape Running Condition Adjustment.
We recommend “TDK SA C-90 and MAXELL UDXLII C-90
cassette tapes’’ for this adjustment.
Cassette
Connect a dualtrace synchroscope to both Left and Right
channels of LINE OUT as illustrated. Then, set the
synchroscope as follows:
® IMODEN Snes asian teens Bob heats CHOP (chopped)
* “SOURCE 42... woh owe as INT (internal), CH1 or CH2
* SWEEP’ MODE® 3 <: ceed cs eae os AUTO (automatic)
Synchroscope
Dummy Load
LINE OUT
PLAY BACK
NOTE:
Adjust the field on the synchroscope with the VOLT. ADJ.
and TIME ADJ.
Remove the Head Cover from the unit. Then, remove the
Pinch Roller of the supply side by unscrewing the adjusting
nut.

4.
Insert the two test tapes into the cassette compartment
alternately and play them back. Then, check to see that the
tape is not curling along the Tape Guide of the Combination
ELECTRICAL ADJUSTMENTS (continued)
(Record/Playback) Head as illustrated.
Pinch Roller
(Supply side)
Tape Tape Guide
Tape Guide Tape
NOTE:
Replace the Pinch Roller of the Take-up side with a new one
Abnormal
Normal
if a tape curl is caused.
Insert the 10 kHz test tape (Example: TEAC MTT-114) into
the cassette compartment and turn the Azimuth Adjusting
Screw until the waveforms of the Right and Left channels
are superimposed. Set to optimum at maximum reading of
the VTVM.
Adjustment
Azimuth Adjusting Screw
6. Attach the Pinch Roller of the take-up side to the unit and
play back the test tapes for the Tape Running Condition
Adjustment. Then, adjust the Pinch Roller height by turning
the adjusting nut until the tape is exactly centered in the
Tape Guide of the Combination Head.
7. While the 10 kHz test tape (Example: TEAC MTT-114) is
being played back, turn the adjusting nut until the
waveforms of the Right and Left channels are superimposed.
Set to optimum at maximum reading of the VT VM.
Adjustment
2s
Adjusting
Nut
Pinch Roller
(Supply side)
8. Then, re-check to see that the tape is not curling along the
Tape Guide of the Combination Head while the test tapes
for the Tape Running condition are being played back.
* |f necessary, turn the adjusting nut until the tape is
exactly centered in the Tape Guide of the Combination
Head.
Adjustment
& Ss Adjusting Nut
Pinch Roller
(Supply side)
Tape Guide Tape
Vy
Abnormal
Normal
—10—
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