Ricoh Fax 680 MP User manual

IF2
RICOH FAX680MP
SERVICE MANUAL
31 March, 1997
Subject to change.

1
CAUTION
Danger of explosion if battery is incorrectly replaced. Replace only with the same
or equivalent type recommended by the manufacturer.
Dispose of used batteries in accordance with the manufacturer's instructions.
CAUTION: 1) Before attempting any of disassembly or assembly procedure, make
sure of the following:
• Turn off the machine.
• Disconnect the power cord.
• Disconnect the telephone cable(s).
• Disconnect the PC interface cable(s).
• Remove the ink cartridge and place it in the cartridge holder.
NOTE: 1) Do not touch the nozzle section of the ink cartridge. This helps prevent
the nozzles from clogging.
2) Do not touch the wiper blade on the maintenance unit. This also
prevents the nozzles from clogging.
3) Always store an extra cartridge (if unpacked) in the cartridge holder.
4) Ensure the printer engine stops its maintenance operation before
turning off the machine.
5) Ensure that the cartridge is at the head capping position (right end)
before leaving the machine unplugged for long periods.

TABLE OF CONTENTS
1. OVERALL MACHINE INFORMATION............................................1-1
1.1 SPECIFICATIONS..................................................................................... 1-1
1.2 FEATURES................................................................................................ 1-2
1.2.1 FAX FEATURES............................................................................... 1-2
1.2.2 PC INTERFACE FEATURES............................................................ 1-3
1.2.3 SERVICE MODE FEATURES........................................................... 1-3
1.3 COMPONENT LAYOUT............................................................................ 1-4
1.4 OVERALL MACHINE CONTROL.............................................................. 1-6
1.5 DATA PATH............................................................................................... 1-7
1.6 POWER DISTRIBUTION........................................................................... 1-8
2. DETAILED DESCRIPTIONS...........................................................2-1
2.1 SCANNER................................................................................................. 2-1
2.1.1 DOCUMENT FEED MECHANISM.................................................... 2-1
2.1.2 SCANNING....................................................................................... 2-1
2.2 PRINTER................................................................................................... 2-2
2.2.1 PAPER FEED MECHANISM............................................................. 2-2
2.2.2 CARRIAGE DRIVE MECHANISM..................................................... 2-3
2.2.3 INKJET CARTRIDGE....................................................................... 2-3
2.2.4 PRINT HEAD MAINTENANCE UNIT................................................ 2-3
2.2.5 INK LOW CONDITION..................................................................... 2-4
2.2.6 PRINTING FAXES AT 300 DPI RESOLUTION................................ 2-5
2.2.7 PROTOCOL REFERENCE............................................................... 2-6
2.3 PC INTERFACES..........................................................................2-6
2.3.1 PC PRINTER: CENTRONICS INTERFACE........................................... 2-6
2.3.2 PC FAX MODEM: RS232C SERIAL INTERFACE.................................. 2-8
2.4 PCBs........................................................................................................ 2-10
2.4.1 FCU................................................................................................ 2-10
2.4.2 NCU................................................................................................ 2-11
3. INSTALLATION PROCEDURE.......................................................3-1
3.1 PRECAUTIONS......................................................................................... 3-1
3.2 INSTALLING THE MACHINE.................................................................... 3-1
3.3 INITIAL PROGRAMMING.......................................................................... 3-1
3.3.1 PROGRAM AND SETUP ITEMS (SERVICE MODE)........................ 3-1
3.3.2 PROGRAM AND SETUP ITEMS (USER MODE)............................. 3-1
3.4 REMARKS................................................................................................. 3-1
4. SERVICE TABLES..........................................................................4-1
4.1 USER MODE............................................................................................. 4-1
4.2 SERVICE MODE....................................................................................... 4-2
4.2.1 HOW TO ACCESS THE SERVICE FUNCTIONS............................. 4-2
4.2.2 COUNTER DISPLAY (FUNCTION 80)............................................. 4-2

4.2.3 BIT SWITCH PROGRAMMING (FUNCTION 81)............................. 4-2
4.2.4 SYSTEM REPORT (FUNCTION 82)................................................ 4-3
4.2.5 RAM REWRITE (FUNCTION 83)..................................................... 4-4
4.2.6 NCU PARAMETERS (FUNCTION 86).............................................. 4-4
4.2.7 PRINT TEST (FUNCTION 87).......................................................... 4-5
4.2.8 PRINT HEAD POSITION ADJUSTMENT (FUNCTION 88).............. 4-5
4.2.9 ERROR CODE DISPLAY (FUNCTION 89)....................................... 4-5
4.2.10 RAM DATA DUMP LIST (FUNCTION 90)...................................... 4-5
4.2.11 PCL3 FONT LIST (FUNCTION 91)................................................. 4-6
4.2.12 SYSTEM INITIALIZATION.............................................................. 4-6
4.3 BIT SWITCHES......................................................................................... 4-8
4.4 NCU PARAMETERS................................................................................ 4-21
4.5 RAM DEFINITIONS................................................................................. 4-23
5. PREVENTIVE MAINTENANCE......................................................5-1
5.1 PREVENTIVE MAINTENANCE SCHEDULE............................................. 5-1
5.1.1 PM TABLE........................................................................................ 5-1
6.REPLACEMENT AND ADJUSTMENT............................................6-1
6.1 EXTERIOR................................................................................................ 6-2
6.1.1 TOP COVER ASSEMBLY................................................................. 6-2
6.1.2 REAR COVER.................................................................................. 6-5
6.2 PCBS......................................................................................................... 6-6
6.2.1 FCU AND NCU................................................................................. 6-6
6.2.2 PSU AND PCIF................................................................................. 6-8
6.3 SCANNER AND PAPER CASSETTE........................................................ 6-9
6.3.1 MAINTENANCE................................................................................ 6-9
6.3.2 SCANNER AND PAPER CASSETTE ASSEMBLY......................... 6-10
6.4 PRINTER ENGINE.................................................................................. 6-13
6.4.1 MAINTENANCE.............................................................................. 6-13
6.4.2 REPLACEMENT............................................................................. 6-17
7. TROUBLESHOOTING....................................................................7-1
7.1 TROUBLESHOOTNG PROCEDURE........................................................ 7-1
7.1.1 COPY TEST...................................................................................... 7-1
7.2 INK NOZZLE TEST................................................................................... 7-2
7.3 TRANSMISSION TEST............................................................................. 7-3
7.4 POWER ON INITIALIZATION TEST......................................................... 7-4
7.5 LCD DISPLAY ERROR.............................................................................. 7-5
7.6 RECEPTION TEST.................................................................................... 7-6
7.7 PRINT MODULE ERROR.......................................................................... 7-7
7.8 ERROR CODES........................................................................................ 7-8

31 March, 1997 SPECIFICATIONS
1-1
Overall
Information
1. OVERALL MACHINE INFORMATION
1.1 SPECIFICATIONS
Type Desktop Transceiver
Applicable Network PSTN, PABX (Loop Start only)
Connection Direct Coupled
ADF Capacity 20 sheets (using 20 lb. paper)
Document
Width: Max. 220 mm
Effective Scanning Width 216 mm (8.5”)
Scanning Method Contact Image Sensor
Scan Resolution Horizontal: 8 dots/mm
Vertical:
- Standard: 3.85 lines/mm
- Detail: 7.7 lines/mm
Printing Method Ink Jet
Print Resolutions Main Scan: 300 or 150 dpi
Sub Scan: 300 dpi
Effective Printing Width 203 mm (8.0”)
Paper Capacity 150 sheets (using 20 lb. paper)
Printing Paper Size: A4, 8.5 x 11”, 8.5 x 14”
Thickness: 0.08 - 0.12 mm
Communication Speed
(ITU-T #1 Chart, MR
compression, TTI off)
Transmission: 17 ± 1 s (Memorytx)
Reception: 17 ± 1 s (Memoryrx)
46 ± 4 s (Directrx)
Protocol T.30
Important:Non-standard signals, NSF and NSS, are
not compatible with existingRicoh fax machines.
Coding Scheme MH, MR
Modem Speed 9600/7200/4800/2400bps
Modulation V.29 (QAM), V27ter (PHM), V.21 (FM)
Memory Capacity
(ITU-T #1 Chart) ECM: 128kB
SAF (standard): 384kB (18 pages)
SAF (with optional 1MB): 1.4 MB (58 pages)
Power Consumption Standby: 17W (18W max.)
Transmission: 25W (28.5W max.)
Reception: 19W (21W max.)
Copy: 27W (31W max.)
Operating Environment Temperature: 17 - 28°C (63 - 82°F)
Humidity: 40 - 70 %Rh
Dimensions Width: 363 mm
Length: 285 mm
Height: 173 mm
(Excluding trays, supplies, and optional units)
Weight 7.1 kg (Excluding trays, supplies, and optional units)

FEATURES 31 March, 1997
1-2
1.2 FEATURES
Please refer to the Operator’s Manual for the available user features and their
details. The following table explains the chief differences from the existing ink-jet
fax, model IFO.
1.2.1 FAX FEATURES
FEATURES IF2 (THIS MODEL) IFO (EXISTING
MODEL)
Authorized reception Not available Standard
Batch transmission Not available Optional
Chain dialing Not available Standard
Confidential transmission/reception Not available Optional
Direct fax number entry Not available Standard
Forwarding Not available Standard
Number of Quick Dial keys 10 10
Number of Speed Dials 50 50
Number of dialing groups 5 groups 3 groups
Keystroke programs Not available Standard
Communication features using ID code
(e.g., Secured polling, closed network) Available (not compatible
with existing
models)
Available
(not compatible
with IF2)
Tonal signal transmission Not available Standard
Transmission deadline (TRD) Not available Optional
Voice Request Standard Not available
Page separation mark Not available Standard
Memory capacity display when there is no file
in the SAF memory 99% 100%
Compression MH and MR MH, MR, MMR,
EFC, and SSC
SAF memory backup Not available Standard
(1 hour)

31 March, 1997 FEATURES
1-3
Overall
Information
1.2.2 PC INTERFACE FEATURES
PC INTERFACE FEATURES IF2 (THIS MODEL) IFO (EXISTING
MODEL)
Parallel interface Bi-Centronics Centronics
Printer Emulation HP PCL3 and IBM
PPDS BJ and LQ
Serial interface RS232C
(9 pins) RS232C (25 pins)
PC fax specification Standard
(EIA Class 1) Optional (EIA Class 2)
1.2.3 SERVICE MODE FEATURES
SERVICE MODE FEATURES IF2 (THIS MODEL) IFO (EXISTING
MODEL)
Back-to-back test Not available Available
Bit switches Available Available
Buzzer test, DTMF tone test, Operation panel
test, and Modem test Not available Available
Communication parameter display Available Available
Counter check Available Available
Country code Available Available
Error code display Available Available
File transfer Not available Available
Line error mark Not available Available
NCU parameters Available Available
Printer mechanism test Not available Available
Printer test patterns Available Available
Protocol dump list Not available Available
RAM display/rewrite Available Available
RAM dump Available Available
RAM test Available in user
mode Available
Serial number/ Service station number
programming Not available Available
Service monitor report Not available Available
Software upload/download Not available Available
SRAM data download Not available Available
System parameter list Available Available
Technical data on Journal Not available Available
User data transfer using RDS Not available Available
RAM read/write using RDS Available
(300 bps) Available (9,600 bps)

COMPONENT LAYOUT 31 March, 1997
1-4
1.3 COMPONENT LAYOUT
H905V001.cdr
H905V002.cdr
1
2
3
456
7
8
9
10
11 12
13
14
15

31 March, 1997 COMPONENT LAYOUT
1-5
Overall
Information
No. Description Function
1Tx Motor Drives the document feed mechanism.
2CIS (Contact Image
Sensor) Scans the document.
3Paper End Sensor
(SB4) Detects paper in the cassette.
4Document Sensor
(SB1) Detects when a document is placed in the document feeder.
5Scan Line Sensor
(SB2) Detects when a document arrives at the scan start position.
6Rx Motor Drives the paper feed mechanism.
7Carriage Drive Motor Drives the print carriage.
8Maintenance Motor Drives the print head cleaning mechanism.
9Carriage Position
Sensor Generates a pulse signal to detect the carriage location.
10 PSU Supplies dc voltage to the FCU.
11 PC I/F Interfaces to a host computer throughBi-Centronics
parallel and RS232C (9 pins) serial interfaces.
12 OPU Interfaces to operators through keys and an LCD panel.
13 FCU Controls fax and printer engines.
14 Registration Sensor
(SB5) Detects printing paper at the registration position.
15 NCU Interfaces to an analog telephone network.

OVERALL MACHINE CONTROL 31 March, 1997
1-6
1.4 OVERALL MACHINE CONTROL
The TC35167F fax engine controls the fax features, while the Motorola M68000
cpu controls the PC printer features. The FOX2 chip controls the printer
mechanisms and the parallel port.
The components are described in more detail in section 2.4.
FCU
PCIF
M68000
FAX ROM
(128 kB)
Printer ROM
(128 kB) DRAM (128 kB)
SB4
OPU
SB2SB1
DRAM
(512 kB) DRAM (1 MB) SRAM (8 kB)
CIS Driver Speaker
AFE NCU
ADDRESS/DATA BUS
ADDRESS/DATA BUS
Driver
Driver
Driver
Carriage
Motor
Maintenance
Motor
Rx Motor
Inkjet Head
SB5
TC35167F
FOX2
Serial
Interface
(DSUB 9 pin)
Centronics
Interface
(36 pin) Buffer
Buffer
Driver
Driver Tx Motor
H905V010.VSD